GM Gasoline V6 90 Degree User Manual

Application Manual

General Motors

Powertrain Group

Gasoline 4.3L
V6 90 Degree
2001 Model Year

ENGINE APPLICATION MANUAL GM Powertrain

Gasoline 4.3L V6 90 Degree Revised: 08/15/2000

ENGINE

APPLICATION MANUAL

Gasoline 4.3L V6 90 Degree

Engines RPO : L35

Model Year: 2001

General Motors Powertrain Group

895 Joslyn Ave

MC: 480-710-225

Pontiac MI 48340

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i

ENGINE APPLICATION MANUAL GM Powertrain

Gasoline 4.3L V6 90 Degree Revised: 08/15/2000

1 . 0 INTRODUCTION

This manual assists the reader in the application of the 4.3L V6 90 Degree family of engines to
Transportation Vehicles, Marine and Industrial applications. It gives an overview of the engine, its
features, and systems. Details are provided on typical interfaces between the engine, related
subsystems, and the vehicle.

Caution:

The performance of the engine is dependent on the specific application. It is recommended that the
owner of this document be contacted before specific application decisions are made.

2 . 0 PRODUCT SUMMARY

2 .1 APPEARANCE

The figure 2.1-I shows the 4.3L V6 90 Degree Engine.

L35 Isometric View

Figure: 2.1-I

2 . 2 FEATURES

The model year 2001 for 4.3L V6 90 Degree Engine has one version: L35.
This Engine has specific values of power and torque, which allow for a very wide range of
application up to 15000 Lbs. GVW.

The more distinctive common features of this family of engines are:

-Optimized Intake Manifold

-Stiff Oil Sump

-High reliability and durability

-OBDII compliant

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ENGINE APPLICATION MANUAL GM Powertrain

Gasoline 4.3L V6 90 Degree Revised: 08/15/2000

2 . 3 PRODUCT SPECIFICATION SUMMARY

2.3.1 SPECIFICATION

ENGINE L35 L35 UNITS

Truck Application Marine

Application

PERFORMANCE

Rated Power 200 223 hp
Rate Power Speed 4600 4800 rpm
Rated Torque 260 275 Lb. ft
Rated Torque Speed 2800 3800 rpm
Torque Extension Speed Range
(From Peak Torque to Peak Power) 1800 1000 rpm
Exhaust Restriction at Rated Power 8.85 to 8.58 0 in hg

(Better than) @ 4600 rpm Piezometer
Inlet Restriction at Rated Power w/Filter -0.89 0 in hg

Redline Speed 5000 5000 rpm
Fuel Cut-Off Speed, Nominal Conditions 5200 5200 rpm
Fuel Cut-Off Speed, Cold Conditions 5200 5200 rpm

Maximum Upshift Speed 5100 Man - 5200 Auto N/A rpm
Minimum Idle Speed 525 650 rpm
Minimum Unassisted Start Temperature -20 -20 Degree C

PHYSICAL/CONTENT

Type: 4 Cycle 4 Cycle
Service Type Naturally Aspirated Naturally Aspirated
Configuration: V V
Bank Angle: 90 90 Degree
Number of Cylinders: 6 6
Valvetrain Configuration: OHV OHV
Number of Valves per Cylinder: 2 2
Displacement: 4302 4302 cc.cm
Bore: 101.6 101.6 mm
Stroke: 88.4 88.4 mm
Compression Ratio: 9.4:1 9.4:1
Firing Order: 1-6-5-4-3-2 1-6-5-4-3-2
Rotational Direction: CW CW
Fuel Injection Pump Electronic Electronic
Certification Federal & California N/A
Engine Mass 200 200 Kg
Spark Plugs 41-932 (0.060”) 41-932 (0.060”)
Oil Filter PF-52 PF-52
Controller Electronic Electronic

SubSystems
Air Intake Subsystem

Throttle Body Type SCPI SCPI

Max Air Flow Rate: 158@ 4600 rpm 158@ 4600 rpm Gr/sec
Intake manifold : Symmetrical Runner Symmetrical Runner
Lower Intake: Aluminum Aluminum
Upper Intake: Composite Composite

@ 4600 rpm Piezometer

(-40) (-40)

Sequential Central Sequential Central

Port Injection Port Injection

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ENGINE APPLICATION MANUAL GM Powertrain

Gasoline 4.3L V6 90 Degree Revised: 08/15/2000

ENGINE L35 L35 UNITS

Truck Application Marine

Application

Cylinder Head Subsystem
Cylinder Head

Material Cast-Iron Cast-Iron
Cylinder Head Type: OHV OHV

Valves Actuation: Push Rod Push Rod
Rocker Arm Ratio 1.5:1 1.5:1

Valve Train

Valves per Cylinder: 2 2
Valves Angle from Vertical: 15 15 Degree
Lifters - Type Hydraulic Roller Hydraulic Roller
Valve Guides Cast Iron Cast Iron

Intake Valves

Material 1541 Steel 1541 Steel
Head Diameter 49.3 49.3 mm
Stem Diameter 7.965 7.965 mm
Length 123.68 123.68 mm
Seats 45 Degree 45 Degree
Lift 11.2 11.2 mm

Exhaust Valves

Material 21 - 4N 21 - 4N

3140 Welded Tip 3140 Welded Tip
Head Diameter 38.1 38.1 mm
Stem Diameter 7.965 7.965 mm
Length 124.84 124.84
Seats 45 Degree 45 Degree
Lift 11.0 11.0 mm

Main Block Subsystem
Block Assembly:

Material Cast-Iron Cast-Iron
Cylinders Cast Iron Cast Iron

Lower Structure Four main bearing Four main bearing
Bore Spacing 111.76 111.76 mm

Deck Height 234.7 234.7 mm

Connecting rods:

Material - Forged-SAE 1141 Forged-SAE 1141
Length - 154.9 154.9 mm
Bolts 9 9 mm
Bearings Aluminum Tin Aluminum Tin

Rod Length to Stroke Ratio 1.68:1 1.68:1

Piston

Type - Strutless Strutless Cam Turned
Material - Eutectic Cast Eutectic Cast
Weight 437 437 Gr

GM232-M GM232-M

Stainless Steel with Stainless Steel with

GM232-M GM232-M

Supports Supports

Silicon Alloy Silicon Alloy

Flat Top Flat Top

Aluminum Alloy Aluminum Alloy

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ENGINE APPLICATION MANUAL GM Powertrain

Gasoline 4.3L V6 90 Degree Revised: 08/15/2000

ENGINE L35 L35 UNITS

Truck Application Marine

Application

Piston Pins

Type - Fixed 24X70 Fixed 24X70 mm
Material - Steel SAE 1019 Steel SAE 1019

Piston Rings

Compression Rings Number: 2 2
Top Compression Steel Barrel Steel Barrel

Second Compression Cast Iron Cast Iron
Oil Control Rings Number - 1 1

Type - Low Tension Low Tension
Material - Plated Steel Plated Steel

Camshaft

Material - 5150 5150
Description Gun Drilled Gun Drilled

Base Circle Diameter: 39.4 39.4 Mm
Drive Chain Pitch Roller 3/8 3/8
Camshaft Valve Timing:

Intake Valve........Opens -33 -33 Crk Degree

Closes 286 286 Crk Degree

Exhaust Valve.....Opens -271 -271 Crk Degree

Closes 48 48 Crk Degree
Camshaft Bearings Steel Backed Steel Backed

Valve Springs

Material Super Clean Super Clean
Type Double Shot Double Shot
Dimension 4.6 mm 4.6 mm
Closed (Valve Closed) 356 356 Newtons

Open (Rate) 65 65 Newtons/mm

Crankshaft

Material - Cast Nodular Cast Nodular
Number of Counterweights 6 6

Main Journal Diameter - 62.2 62.2 Mm
Crank Pin Journal Diameter 57.1 57.1 Mm
Bearings Aluminum Tin Aluminum Tin

Torsional Damper Ring Inertia Ring Inertia Rubber Mounted
Crankcase Ventilation Negative Closed Negative Closed

1.5mm 1.5mm

1.5 mm 1.5 mm

3 Pieces 3 Pieces

Steel Billet Steel Billet

BTDC BTDC
ATDC ATDC
BTDC BTDC

TDC TDC

Copper/Lead Copper/Lead

Cr-Si Cr-Si

Peened Peened

Round Round

Undercut Rolled Fillet Undercut Rolled Fillet

Silicon Alloy Silicon Alloy

(Vacuum created from (Vacuum created from

Intake Manifold) Intake Manifold)

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ENGINE APPLICATION MANUAL GM Powertrain

Gasoline 4.3L V6 90 Degree Revised: 08/15/2000

ENGINE L35 L35 UNITS

Truck Application Marine

Application

Balance Shaft

Type First Order First Order
Material Nodular Cast Nodular Cast
Rotation CCW CCW
Speed Same as Crank. Same as Crank.
Drive Helical Gear 14 ° Helical Gear 14 °

Oil Lubrication

Main and Rod Bearings Pressure Pressure N/a
Camshaft Pressure Pressure N/a
Timing Gear Splash Splash N/a
Connecting Rods Pressure Pressure N/a
Valve Mechanism Pressure Pressure N/a
Cylinder Walls Splash Splash N/a
Piston & Pins Splash Splash N/a
Cylinder Head Hollow Hollow N/a

Oil Capacity

Oil 5W-30W 5W-30W N/a
W/ Filter 4.5 4.5 Qts

W/o Filter 4.0 4.0 Qts

Oil Filter

Type Full Flow Full Flow N/a
Capacity 0.3 0.3 Qts

Oil Pump

Type Spur Gear Spur Gear N/a
Normal Pressure 40-45 psi 40-45 psi @ 2000 RPM
Idle Pressure 20-25 psi 20-25 psi @ Idle
Oil Flow @ 1000 RPM 2 2 GPM
Drive Camshaft Camshaft N/a

Fuel Injection System

Mean Features
Injection Pump Make Delphi Delphi
Type Top Feed Top Feed
Model SCFI SCFI
Injection Timing Sequential Sequential
Operating Pressure 425 +/- 9 425 +/- 9 KPa
Opening Pressure 285 +/- 9 285 +/- 9 KPa
Fuel Pump
Fuel Pump Make Delphi Delphi
Type 44MM -G-Rotor 44MM –G-Rotor
Minimum Fuel Flow 25 25 Gram/Sec
Maximum Fuel Flow TBD TBD Gram/Sec
Fuel Pump Voltage Range 6-12 6-12 Volts
Fuel Pump Pressure 425 425 Kpa
Fuel Filter Delphi Delphi
Type Full Full

Material Nylon 66 Nylon 66

Off Cam Off Cam

Push Rod Push Rod

Mineral Mineral

PF-47 PF-47

Recirculation Recirculation

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ENGINE APPLICATION MANUAL GM Powertrain

Gasoline 4.3L V6 90 Degree Revised: 08/15/2000

ENGINE L35 L35 UNITS

Truck Application Marine

Application

Regulator Delphi Delphi
Nominal Pressure 425 425 Kpa

Injectors Delphi Delphi
Recommended Fuel 87 87 Octane = (R+M)/2
Water Pump Type: Centrifugal Centrifugal
Water Pump Maximum Flow @ Engine RPM: 76.5 76.5 GPM @ 4600

Maximum Sustained Coolant Temperature: 262 262 F
Thermostat Setting
Starts to Open 180 180 F
Full Open 262 262 F
Bearing Type Ball/Roller Ball/Roller
Impeller Material Cast iron Cast iron
Housing Material Cast iron Cast iron
By Pass Recirculation Type External External
Water Jackets full length of Cylinder Yes Yes
Water Jackets all around Cylinder Yes Yes
Water Jackets open at head face No No
Surge Tank System No No
Coolant Fill LocationDeaeration Tank Deaeration Tank
Circulation Thermostat Type Bypass Bypass

- direction of rotation : CCW CCW

- drive ratio (relative to crankshaft) 1.25 1.25

Cartridge Cartridge

RPM

2.3.2 Fuel Requirements

The 4.3L V6 90 Degree Engine System meets the emissions standard established in the FMVS
and EPA regulations with fuel quality in accordance with the API standards.

The engine must operate on the following types of fuels:
Unleaded Gasoline 87 (R+M)/2 (ASTM D4814),
Unleaded Gasoline 87 (R+M)/2 with up 15 % MTBE (Methyl Tertiary-Butyl Ether),
Canadian Gasoline 87 (R+M)/2 (CGSB 3.5-92) w/ MMT @ 18 mg/L manganese,
Reformulated Gasoline,
Premium Unleaded 91 (R+M)/2,
Export Gasoline as low as 80 (R+M)/2,
South American Gasoline with Peroxide contamination to 2.5%
Methanol mixes with gasoline to 15 %,
Ethanol mixes with gasoline to 25 %, Brazilian fuel system (SCPI) required.
Leaded Gasoline. Special cylinder heads required- NM8

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ENGINE APPLICATION MANUAL GM Powertrain

Gasoline 4.3L V6 90 Degree Revised: 08/15/2000

2. 3 . 2 Performance

2.3.2.1 Engine Power & Torque

The performance of the 4.3L V6 Engine is specified in the following paragraphs.
The Fig 2.3.2.1-I shows the following performance characteristics for the L35 engine: Power,

Torque and Speed Range.
The engine will deliver the power and torque levels within +/-5% (after run in) as shown in

Table 2.3.2-I.

RPM Truck Marine Industrial Notes

Applications Applications Applications

Power Torque Power Torque Power Torque

HP Lbs.-ft HP Lbs.-ft HP Lbs.-ft

800 32.4 210.4 35.7 233.5 N/A N/A
1200 50.7 221.9 57.0 248.6 35 200
1600 72.6 238.1 78.7 257.7 60 210
2000 93.8 246.1 99.1 260.2 80 220
2400 116.3 254.3 120.3 262.5 105 230
2800 137.9 258.2 143.4 269.1 118 220
3200 157.5 257.9 166.4 272.7 120 210
3600 174.7 254.4 188.2 274.1 119 200
4000 188.5 247.1 206.2 270.2 118 190
4400 195.8 233.0 217.6 259.5 N/A N/A
4600 198.1 226 220.8 252.0 N/A N/A
4800 197.8 216.3 221.6 242.3 N/A N/A
5200 192.3 194.2 216.0 218.0 N/A N/A

Fig 2.3.2.1 -I 4.3L V6 Engine Power & Torque

Test Conditions for Truck Applications
* Based on the following conditions (measured at maximum rated speed W.O.T):

-Exhaust restriction 8.5” of Hg

-Air Intake temperature 77° F

-Intake restriction - 1” of Hg

-SAE J1349
Test Conditions for Marine & Industrial Applications

* Based on the following conditions (measured at maximum rated speed W.O.T):

-Exhaust restriction: 0 of Hg

- Air Intake temperature: 77 ° F

-Intake restriction - 1” of Hg

-GMPT Test #20

-This data reflects the Maximum values obtained with Different Intakes Manifolds & Fuel
Systems

2 . 4 FEATURE LOCATION ILLUSTRATIONS

Front, Rear, Rh and Lh views of the 4.3L V6 90 Degree are included here with its overall dimensions
for preliminary packaging evaluations.

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ENGINE APPLICATION MANUAL GM Powertrain

Gasoline 4.3L V6 90 Degree Revised: 08/15/2000

L35 Main Views

L35 Front View

L35 Rear View

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ENGINE APPLICATION MANUAL GM Powertrain

Gasoline 4.3L V6 90 Degree Revised: 08/15/2000

L35 RH Side View

L35 LH Side View

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ENGINE APPLICATION MANUAL GM Powertrain

Gasoline 4.3L V6 90 Degree Revised: 08/15/2000

2 . 5 CONFIGURATION AS SHIPPED

2. 5 . 1 Engine as Shipped

Engine as shipped from the engine plant is to conform to a common state of dress as described
below. The following components are installed at the engine plant:

Harmonic balancer Crankshaft sensor
Direct drive accessories (not belt driven) E.G.R. system
Engine lift brackets Engine oil
Engine oil dipstick and tube Exhaust manifold(s)
Exhaust manifold heat shields (As required) Engine Fuel system
Heater hose nipples Coolant temperature sensor/switch
Manifold air pressure sensor Oil pressure sensor/switch
Oil filter (except remote mounted) Transmission alignment dowels
Water pump Flywheel and or Flexplate

Crankcase ventilation system

2 . 6 IDENTIFICATION AND MARKING

2.6.1 VIN Identification Labeling

There are two places for the stamping of the V.I.N.: one is provided side by side on the left hand
side of powertrain and the other is in rear face of cylinder case.

2.6.2 Emissions Certification Labeling

A vehicle emission control label that meets the format and content requirements of Federal
Regulation 40 CRF 86.095-35 and CARB Regulation Title XIII California Code of Regulations
Section 1965 shall be attached to the vehicle subsystem in the location required by the
regulations above.
Incomplete Vehicles manufactured in two or more stages shall meet the certification labeling
requirements of the regulations above.
Emissions Certification is not provided for Marine Industrial Applications.

2.6.3 Engine Identification - Broadcast Codes

The 4.3L V6 Engine has an identification number cast into the cylinder case front LH side.
Also, an Engine Verification Label is applied to the rear of the left bank cylinder head. This is the
single label location for passenger car engines. In addition to the LH rear head location, the
truck engines have another identical label applied to the oil pan (near the bottom of the engine)
on the right side.
The labels show the following information:

• First Two characters: 10 - Indicates an engine not a transmission.

• Next 3 characters: Broadcast code (engine configuration which includes a cross reference to
model year of build):

- Model year (1st letter)

characters: Julien Date of Build

• Last 4 Characters: Sequence number of build on that date.

Translated the engine verification number shown in the sample label below identifies an engine,
broadcast code (XJB) (1999 5.3L Federal Auto), built at Romulus on February 10 , 1999;
sequence number 1034.

Example: * 10XJB W990411034*

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ENGINE APPLICATION MANUAL GM Powertrain

Gasoline 4.3L V6 90 Degree Revised: 08/15/2000

2.6.3.1 Engine Option Description

RPO Description Notes

L35 4.3L V-6 Engine w/ SCPI

M30/MT1 Automatic Transmission

M50/MG5 Manual Transmission

K18 Air Injection (Electric pump)

KC4 Engine Oil Cooler

KL5 Gaseous Fuel Compatible
NA1 Below 8500# GVW
NA3 Emission System - Japan
NA4 Above 8500# GVW
NB6 Emission System - Calif. Tier 1 (-K18 on CK Manuals)
NC1 Emission System - Calif. LEV (+K18 on CK / -K18 on M/L)
NC8 Emission System - Calif. ULEV (-K18 on ML)
NF2 Emission System - Federal Tier 1 (-K18 on CK & P)
NF4 Emission System - Clean Fuel Fleet
NF7 Emission System - Federal N LEV

NM2 Emission System - Leaded Fuel (Export for ML & P)
NM8 Leaded Fuel System Compatible (Export for ST)

NN8 Emission Override - Unleaded Fuel (Export)

NW7 Traction Control
RHD Right Hand Drive

S5I Brazil Equipment

W99 Venezuela Equipment

TZ0 Mexican Equipment (Manual Transmission)
ZK3 G-Van Pull Ahead (Vehicle only)

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ENGINE APPLICATION MANUAL GM Powertrain

Gasoline 4.3L V6 90 Degree Revised: 08/15/2000

2.6.3.2 Engine Broadcast Codes & Part Numbers

Part TON ROM Broad Vehicle Description

Number Cast

Code

12559672 X AAA CK L35+M30+NF2 (-K18)
12559676 X AAF CK L35+M30+NC1 (+K18)
12559673 X AAB CK L35+MG5+NF2 (-K18)
12559677 X AAH CK L35+MG5+NC1 (+K18)

12559680 X ABA G-LD L35+M30+NA1-K18
12559681 X ABB G-HD L35+MT1+NA4 (-K18)
12559682 X ABC G-LD L35+M30+NA1+NF4+K18

12559684 X ACA ML L35+M30+NA3/NC1/NC8/NF2/NF4/

NF7

12559685 X ACB ML L35+M30+NM2

12559687 X ADA P L35+MT1+NF2-KL5
12559688 X ADB P L35+MT1+KL5+NF2

12559691 X X AFC S L35+M30-K18-NM8 (+NN8)
12559707 X AFL S L35+M30+NM8
12559692 X X AFD S L35+M50-K18-NM8 (+NN8)
12559708 X AFN S L35+M50+NM8
12559701 X X AFJ S L35+M30+K18+NF4
12559702 X X AFK S L35+M50+K18+NF4

12559695 X X AHC T L35+M50-K18-NM8-RHD
12559696 X X AHD T L35+M30-K18-NM8-RHD
12559709 X AHP T L35+M50+NM8-W99
12559710 X AHS T L35+M50+W99+NN8
12560378 X AHX T L35+M30+RHD-NM8-K18
12560379 X AHY T L35+M50+RHD-NM8-K18
12559711 X AHT T L35+M30+NM8
12559705 X X AHL T L35+M30+NF4+K18
12559706 X X AHN T L35+M50+NF4+K18

12560483 X 1LB —- Marine (Volvo) 2Bbl w/Dist.
12560485 X 1LJ —- Marine (Merc) 2Bbl w/o Dist.
12560484 X 1LC —- Marine 4Bbl w/ Dist.
12560486 X 1LK —- Marine 4Bbl w/o Dist.
12560481 X 1LT —- Indust 2Bbl Gaseous - Bucks

Irrigation

12560482 X 1LX —- Indust 2Bbl Gas - Williams

Powertrain
12559712 X 1LA T L35+M50+S5I (Brazil)
12559713 X 1LD T L35+M30+S5I (Brazil)

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ENGINE APPLICATION MANUAL GM Powertrain

Gasoline 4.3L V6 90 Degree Revised: 08/15/2000

3.0 GMPT SYSTEM INTERFACES

3.1 INTERNAL INTERFACES TO GMPT

3.1.1 Engine Interface to transmission

The transmission shall be attached to the rear end of the engine, which provided the flange face
attachment illustrated in the figure 3.1.1- I.

Figure 3.1.1-I: Transmission attachment

3.1.1.1 Automatic Transmission

The 4.3L V6 engine could be mated to either: the GM Automatic Transmission Hydra Matic
4L60E or the GM Automatic Transmission Hydra Matic 4L80E
Figure 3.2.1-I to 3.2.1-XVIII shows the PCM Engine to Automatic Transmission Mechanization
Diagram.

3.1.1.2 Manual Transmission and Clutch

The GM Manual Transmission recommended is a Five Speed Manual (MW 3)
The following engine-transmission, clutch interface issues must be considered:
Manual transmissions require the engine crankshaft pilot bearing to be able to support up to 920
lbs (4292 N) of radial load due to transmission internal gear forces.

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ENGINE APPLICATION MANUAL GM Powertrain

Gasoline 4.3L V6 90 Degree Revised: 08/15/2000

The following table shows the different Transmissions and Components coupled to the L35 engine and
GM platforms.

Transmission P-Truck C/K Truck G-Van M/L -Van S/T Truck

( UPC: 7 )

Auto 4L80E MT1 24210752 N/A 24210754 N/A N/A
Bolt/Screw/Stud 15724226 N/A 15724226

11514224 11514224 N/A N/A

Auto 4L60E M30 N/A 24211665 24211668 24211663 24211662

24211666 24211664 24211663

24211667
Brace N/A N/A N/A 15992466 N/A
Bolt/Screw/Stud N/A 11515768 11515768 15724226 11517000

15724226 15724226 11517000 1261968

25624806

Manual 5-Speed MW3 15020892 N/A N/A N/A N/A

15031131
Bolt/Screw/Stud 11514224 N/A N/A N/A N/A
Manual 5-Speed MG5 N/A 15769087 N/A N/A N/A

15769088
Bolt/Screw/Stud N/A 11515768 N/A N/A N/A
Manual 5-Speed MW2 N/A N/A N/A N/A 15045050

Bolt/Screw/Stud N/A N/A N/A N/A 11515768
Manual 5-Speed M50 N/A N/A N/A N/A 15769696

15769697
15769698

Bolt/Screw/Stud 11517000

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ENGINE APPLICATION MANUAL GM Powertrain

Gasoline 4.3L V6 90 Degree Revised: 08/15/2000

3.1.2 Engine Interface to PCM ( Vehicular and Marine/Industrial Application)

The 4.3L V6 90 Degree Engine uses the Powertrain Control Unit (PCM) to control the engine,
automatic transmission, the vehicle performance parameters and the onboard diagnostic system.

3.1.2.1 Inputs from the Engine to the PCM

The following Inputs are internal engine parameters and must be supplied to the Powertrain
Control Module:
Barometric Pressure (Or Manifold Absolute Pressure) - POA Engine Assembly
Mass Airflow Sensor (Air Cleaner/Air Duct)
Engine Speed
Crankshaft Sensor and Camshaft Sensor
Knock Sensor
Air intake Temperature Sensor (POA MAF) - (Only for the GMT-800 Truck)
Engine Coolant Temperature ECT Sensor-POA Engine Assembly
Engine Oil Pressure Sensor

3.1.2.2 Outputs from PCM to the Engine

Fuel Injectors Management – (Injection Pulse Width Signal)
Idle Air Control Motor (IACV)
Ignition Control Coil Module
Linear EGR Valve Solenoid
Evap. System
Purge Solenoid
Secondary Air (AIR) System
A/C Control
Serial Data

3.1.3 PCM Interface to Transmission

The PCM uses an Electronic Transmission Control Algorithm to monitor and control the transmission.
This algorithm is actually a combination of four algorithms, these algorithms monitor and control
the various aspects of the transmission shifting.

3.1.3.1 Input Algorithm:

The Input Algorithm samples all external sensors and scale these values.

3.1.3.2 Shift Control Algorithm:

The Shift Control Algorithm determines which gear ratio the transmission is currently in and
changes the state of the control solenoid to accomplish a shift.
The shift pattern is controlled by a set of tables. These contain the vehicle speed at which the
shift is to occur as a function of throttle position.
In the manual mode, the current gear may be determined by the operator’s movement of the
gearshift selector lever.

3.1.3.3 Shift Quality Algorithm:

The Shift Quality Algorithm determines shift quality (or firmness).
This is accomplished by controlling the pressure control solenoid, which regulates the torque
signal modulation pressure.
This pressure is determined by a table that is based on vehicle speed and Throttle position.
Garage Shift quality (shifting from Park or Neutral to Drive or Reverse when the vehicle is
stationary) is also controlled by torque signal pressure.

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ENGINE APPLICATION MANUAL GM Powertrain

Gasoline 4.3L V6 90 Degree Revised: 08/15/2000

3.1.3.4 TCC Control Algorithm

The TCC algorithm determines when the torque converter clutch is applied or released, using
a set of tables. These tables also determine and control the rate of application and release of
the TCC based on Throttle position

3.1.3.5 Inputs from Transmission to PCM

The following are external Inputs coming from the Transmission to the PCM:
Transmission Speed Sensor
Transmission Fluid Temperature Sensor
Transmission Range Pressure Sensor

3.1.3.6 Output to the Transmission from PCM

TCC Solenoid
Transmission Shift solenoids
Pressure Control Solenoid

3.1.4 PCM Interface to Vehicle

3.1.4.1 External Inputs of the Engine

The following are external Inputs coming from the vehicle to the PCM:
A/C Status
Ignition Voltage
Serial Data (Diagnostics)
Brake/ Clutch Status
4WD Lo Switch (If Applicable)
Diagnostic Enable
Cruise Control Inputs
Tow/Haul Input Switch

3.1.4.2 Output to the Vehicle:

Data link Connector
MIL “Service Engine Soon” Lamp
“Service Throttle Soon” (STS) Lamp

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16

ENGINE APPLICATION MANUAL GM Powertrain

Gasoline 4.3L V6 90 Degree Revised: 08/15/2000

3.1.5a PCM Pin Out and Pin In – Truck Applications

See Figure 3.1.5 - I Powertrain Control Module Diagram to reference the following pin out and
pin in connector information

Figure : 3.1.5a - I PCM Pin Out /In Connector C1

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17

ENGINE APPLICATION MANUAL GM Powertrain

Gasoline 4.3L V6 90 Degree Revised: 08/15/2000

Figure : 3.1.5a -II PCM Pin Out /In Connector C2

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18

ENGINE APPLICATION MANUAL GM Powertrain

Gasoline 4.3L V6 90 Degree Revised: 08/15/2000

The following table shows the different PCM ASM and Components coupled to the L35 engine per GM
platforms.

PCM

( 12 F ) P-Truck C/K Truck G-Van M/L -Van S/T Truck

Module ASM 9368071 12201281 12201281 12201281 12201281

52370668
Housing Extension 15003789
Bracket 15005865 15047570 15766026 15047570 15767011

15714426

Bolt/Screw/Nut 3846202 11516568 11514519 11516568 11516568

11514139 11514006

Sensors P-Truck C/K Truck G-Van M/L -Van S/T Truck

( 12 F )

Oxygen Sensor 25312191 25312191 25312191 25312191 25312191

25312201 25314006 25314006 25314006 25314006

Mass Air Flow Sensor 25168491 Include in Air Include in Air Include in Air Include in Air

SubSystem SubSystem SubSystem SubSystem

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19

ENGINE APPLICATION MANUAL GM Powertrain

Gasoline 4.3L V6 90 Degree Revised: 08/15/2000

3.1.5b PCM Pin Out and Pin In – Marine and Industrial Applications

Marine Applications use a different control module : MEFI – 4 Multiport Electronic Fuel Injection.
Interfaces as those described for vehicles application, OBD II, and Emissions requirement are
not longer needed.

Table A.1 shows the connector pin out for MEFI Electronic Control Module (ECM) Part Number
12569494 Rev B.

Table A.1 – Pinout

PIN MEFI4 PIN NAME PIN MEFI4 PIN NAME

J1-1 KNOCK2 J2-1 BATT
J1-2 DIAG*_BOOT J2-2 V5B
J1-3 MASTER J2-3 V5BRTN
J1-4 GW2/GOVMOD J2-4 FUELPRESS
J1-5 ESTOP J2-5 EGRFB
J1-6 FPR J2-6 O2AHI
J1-7 RPMCHG J2-7 CLT
J1-8 BUZZER J2-8 MAP
J1-9 CKGAGE/GOVOVS J2-9 CANLO
J1-10 VR_REFLO J2-10 SDATA
J1-11 INJB J2-11 TACDATA2
J1-12 EGR J2-12 ESTH
J1-13 GND3 J2-13 ESTF
J1-14 TACH J2-14 ESTD
J1-15 IACBLO J2-15 ESTB_BYP*
J1-16 IACAHI J2-16 REF
J1-17 KNOCK1 J2-17 DEPSPWR
J1-18 OILLEV J2-18 DEPSLO
J1-19 GW1/FCAL J2-19 IGN
J1-20 LOAD1/LOCKLO/SHIFTINT J2-20 OILPRESS
J1-21 LOAD2/TWINSYNC/TROLL J2-21 MAT
J1-22 GW1LMP/TRAN/CNP J2-22 O2BHI
J1-23 GW2LMP/TROLLMP/GOV J2-23 TPS
J1-24 OILLEVLMP J2-24 CANHI
J1-25 VR_REFHI J2-25 VSSVF
J1-26 INJA J2-26 VSS_AN/FTEMP
J1-27 CE J2-27 TACDATA1
J1-28 GND1 J2-28 ESTG
J1-29 GND2 J2-29 ESTE
J1-30 IACBHI J2-30 ESTC
J1-31 IACALO J2-31 ESTA
J1-32 FPRSENSE J2-32 CAM

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20

ENGINE APPLICATION MANUAL GM Powertrain

Gasoline 4.3L V6 90 Degree Revised: 08/15/2000

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21

ENGINE APPLICATION MANUAL GM Powertrain

Gasoline 4.3L V6 90 Degree Revised: 08/15/2000

3.1.6 Engine interface to exhaust

3.1.6.1 Content

The engine is provided with exhaust manifolds for vehicles and Industrial Applications.
The exhaust manifold system includes the manifold, fasteners to the cylinder head, and
partial or full cover type heat shield. The exhaust manifold may also incorporate provisions
for EGR attachment.

Vehicle Exhaust System

The 4.3L V6 90 Degree Engine shall be attached to the vehicle and interface with the
Vehicle Exhaust System.
The Vehicle Exhaust System will be designed or adapted considering the following Issues:
Vehicle Exhaust System Back pressure: All performance parameters specified in paragraph:

2.3.2.1 were measured with a maximum exhaust restriction of 8.5” of Hg.

Thermal Management of Exhaust

Thermal management of exhaust
The following issues must be considered:
a. Location of Catalytic Converter: The location of the catalytic converter is determined by

resolving three competing needs. The first need is to locate the converter such that it is
close enough to the engine so that sufficient heat is transferred to the converter via the
exhaust stream so as to initiate catalytic activity and therefore constituent conversion
soon enough to meet emission requirements. The second need is to locate the catalytic
converter far enough downstream from the engine in the vehicle’s exhaust system so that
the converter will not be damaged during extended duration high exhaust gas stream
temperature excursions resulting from high speed and load operation of the engine. The
third need is to locate the converter in a position in the chassis where it will package with
sufficient clearance to surrounding components or systems to prevent heat related
failures in those systems or components.

b. Location of Oxygen Sensor(s)

All OBD II compliant exhaust systems contain enough oxygen sensors to guarantee
proper monitoring of the exhaust gases. Each engine cylinder bank requires an oxygen
sensor for air/fuel ratio control. An oxygen sensor is required behind each catalytic
converter for diagnosis purposes. Post converter oxygen sensors are also implied for
slow air/fuel ratio trim. Oxygen sensor wiring connections must be located to as to avoid

moisture contamination.
c. Converter Volume and Flow
d. Location of muffler
e Vibration/shock of catalytic converter
f. Material life for exhaust system through catalytic converter
g. Thermal Characteristics
h. Exhaust Leakage

The exhaust system must be leak free for the emission useful life of the vehicle.

In order to have a working definition of leak free, the exhaust system is divided into three

zones:

Zone A (A/F Control) Cylinder head / exhaust manifold interface to

control oxygen sensor
Zone B (Converter Feedstream) Control oxygen sensor to converter
Zone C (Diagnostic Feedstream) Converter to 12 inches downstream of the

diagnostic oxygen sensor

Maximum allowable leakage in each zone is 2 liters/minute at 15 kPa.

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22

ENGINE APPLICATION MANUAL GM Powertrain

Gasoline 4.3L V6 90 Degree Revised: 08/15/2000

The following table shows the different Exhaust Assemblies and Components coupled to the L35 engine
per GM platforms.

Exhaust P-Truck C/K Truck G-Van M/L -Van S/T Truck

( 8 C )

Manifold ASM 15986438 15029769 15029769 15029769 15029769
Pipe ASM Exhaust 15045399 15749444 15744824

15034810 15744826
15743099 15744828/9

Manifold Seal 12555091 15035747 11514597 12555091 12555091

15035748

Manifold Gasket 15997189 15997189 15997189 15997189 15997189

15767098

Shield 15753676 15027911 15027911 15736668

Screw/Bolt/Nut 11514597 15733192 15997953 15023752 15023752

15733192 15032594 11514597 11514597

Converter ASM 25160620 15052911 15159709 15744810 15744810

15986441 15756278 15160977 15749445 15749445

15700838 12568312
15747730

Converter Pipe ASM 15986425 15709444 15709444 N/A N/A

15986425

15986428
Converter Gasket 15027074 15027074 15027074 15027074 15027074
Shield 15739194 TBD 15739194 15027095 TBD

1507912 1507912 15150934
Clamp 15529483 15529483 15529483 15529483 15529483
Screw/Bolt/Nut 15709703 15709703 15709703 15709703 15709703

9442939 15997953 15997953 15997953 15997953

11517501 11517501 11517501 11517501

Muffler ASM 15727690 15040396 15008799 15756876 15756876

15040397 15159716 15756877 15756877
15061814 15761545

Exhaust Pipe ASM 15727691 15756780 15739879 N/A 15156883/4

15156936/5

Shield 15739195 15739195 15990607 15990607
Hanger/Bracket 15986421 15986421 15986421 15152715 15023065/6

15986422 15986422 15986422 15976360

15976332

Clamp 15595047 15595047 15595047 15595047 15595047

15529483 15529483 15529483 15529483 15529483

Screw/Bolt/Nut 11515799 11515799 11515799 11500831 11500831

11515216 11515216 11515216 11515768 11515768

9424320 9424320 9424320 15695050

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23

ENGINE APPLICATION MANUAL GM Powertrain

Gasoline 4.3L V6 90 Degree Revised: 08/15/2000

3.1.6.2 Back Pressure

Exhaust back pressure shall not exceed 8.5 inches of Hg at rated speed and load. Lower
exhaust back pressure is desired from a performance and fuel economy standpoint.

3.1.6.3 Packaging

The vehicle assembly plant attaches the exhaust pipe to the manifold with the proper
fasteners and a gasket or seal. Exhaust manifold takedowns will be 2 or 3 fastener designs.

Consult GM application engineer.
The current exhaust manifolds are made from Nodular Iron with incorporated and

detachable heat shields.
Fasteners at the manifold takedown must be capable of withstanding temperatures up to

800°C and will require stainless steel or sermagard coated steel. The gasket/seal must also
withstand these temperatures and will require stainless steel or stainless steel with mica or
grafoil.

The heat shield provided on the exhaust manifold will reduce radiant heat to nearby critical
components and reduce or minimize the number of separate shields required by the vehicle.

3.1.6.4 Exhaust Gas Recirculation (EGR)

EGR P-Truck C/K Truck G-Van M/L -Van S/T Truck

( 6 L 3 )

EGR ASM Valve 17200268 17200268 17200268 17200268 17200268

3.1.6.5 Secondary Air

GMPT will indicate the needs for secondary air recirculation.
The following table shows the different Secondary Air and EGR Assemblies and

Components coupled to the L35 engine per GM platforms.

Engine Secondary Air P-Truck C/K Truck G-Van M/L -Van S/T Truck

( 6T )

Pump Air Inj ASM 15059238 15053709 15056764
Hose ASM 15022544 N/A 15023825
Hose ASM By Pass 15022570 N/A 15760279
Stud 20513798 N/A
Washer 15953691
Strap 11509086
Bolt Screw 11508706
Pipe ASM 12561825 12562572 12561250/51
Check Valve (or Bypass) 12567731 12567745 15037955
Check Valve (or Bypass) 12567732 12567746 15056713
Bolt Screw 12558020 11515210 15695050

9440034
Gasket 12561871 12561871 12561871
Shield 15026631
Nut 11514596

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24

ENGINE APPLICATION MANUAL GM Powertrain

Gasoline 4.3L V6 90 Degree Revised: 08/15/2000

3.1.7 Engine Interface to Cruise Control

Figure 3.2.1-I to 3.2.1-XVIII shows the PCM Engine to Vehicle Mechanization Diagram with this
interface. The following table shows the different Cruise Control Modules and Components used
with the L35 engine and GM platforms.

Cruise Control P-Truck C/K Truck G-Van M/L -Van S/T Truck

( 6 N 4 )

Cruise Control Module 25315559 25315559 25315090 25315087 15028014

Cable 15040802 15040802 15031096 15045430 15045460

15040801 15040801 15751730

Bolt/Screw 11517009 11517009 15685170 11515928 11508010

11518009 11518009 15983425 11517507

15685170 15685170

3.1.8 Accelerator Pedal

Figure 3.2.1-I to 3.2.1-XVIII shows the PCM Engine to Vehicle Mechanization Diagram with this
interface. The following table shows the different Pedal Accelerator Assemblies and
Components used with the L35 engine and GM platforms.

Pedal Accelerator P-Truck C/K Truck G-Van M/L -Van S/T Truck

( 6 N 2 )

Pedal Accelerator ASM 15944514 15944514 15756441 15756441 15015757

15160381 15716466

Cable 15148661 15038820 15031093 15031093 15010419

15148662 15741073 15153422

Bolt/ Screw 9433298 11514516 11514516 15010419

11516150
11517519

15717608

25315088

15729139

3.1.9 Engine to Evaporative Fuel System

Figure 3.2.1-I to 3.2.1-XVIII shows the PCM Engine to Vehicle Mechanization Diagram with this
interface. The following table shows the different Fuel Lines, Fuel Tank and Evaporative
Assemblies and Components coupled to the L35 engine per GM platforms.

Fuel Evaporative P-Truck C/K Truck G-Van M/L -Van S/T Truck

( 8 D )

Canister ASM 17098106 15056485 17098085 17098085 17201171

Shield 15004076
Hose 10282447 15759042 N/A 15012787 9439150

15721451 15759043 15150414
15733597 15726983
15721447 15768562
15721448
15731510

Clamp 10108259 10108259 N/A 10108259 10108259

11516221 11516221 11516221 11516221

Separator 17096210 N/A 15032645 15032645 15032645

15032646 15032646 15032646

Bracket 15009801 15056490 15769694 15769694 15049107

15013689 15742240
15746404 15734230
17565062 15992101
15731699

Harness 12556909 12555973 12561900 12561900 11509087
Strap 11509087 11509087 15000499 11509087 11509087

Valve 12559015 15032643 15032643 15759225 25658328

15032644 15032644 12559015

Bolt/Screw/Nut 11508797 11516573 11515211 11515211 11515654

3847758 11513914 11508797 11508797 11515656
3975550 3847758 11515658

11515211 3975550

17097127

17097120

12566190

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25

ENGINE APPLICATION MANUAL GM Powertrain

Gasoline 4.3L V6 90 Degree Revised: 08/15/2000

3.1.10 Accessory Drive System

The engine is released with an accessory drive system whose components are dimensioned
and released as indicated in the paragraphs 3.1.11 to 3.1.16.

The maximum torque from the front crankshaft pulley is 150 ft lb., regardless of the engine
speed; so it is recommended that the Belt System Drive maximum Torque requirement not to
exceed 140 ft lb.

For torque values above 140 ft. lb. the customer shall provide different PTO assembly.

3.1.11 Standard Accessory Descriptions

GMPT accessory drive design release engineer will provide attachment points and drive of these
components on the engine.

The following table 3.1.11-I shows the different combinations of components coupled to the L35
engine accessory drive brackets per GM platforms.

3.1.12 Cooling Fan

Cooling Fan assembly is not part of the engine scope or extent of supply.
Cooling fan is designed, dimensioned and released by the GM - HVAC engineering group taking

in consideration the Heat Rejection (indicated in the paragraph 3.4.5) needed to evacuate from
the engine through the radiator assembly.

If the Fan is driven from the crankshaft front pulley and the maximum torque values specified in
paragraph 3.1.10 shall be taken in consideration.

3.1.13 Alternator

Alternator is not part of the engine scope or extent of supply.
Alternator is designed, dimensioned and released by the GM - Electrical engineering group

taking in consideration all vehicles electrical power needs.
If the alternator is driven from the crankshaft front pulley and the maximum torque values

specified in paragraph 3.1.10 shall be taken in consideration.

3.1.14 Power Steering Pump

Power Steering Pump is not part of the engine scope or extent of supply.
Power Steering Pump is designed, dimensioned and released by the GM - Chassis engineering

group taking in consideration the vehicles drive needs.
If the power steering pump is driven from the crankshaft front pulley and the maximum torque

values specified in paragraph 3.1.10 shall be taken in consideration.

3.1.15 AC Compressor

AC Compressor assembly is not part of the engine scope or extent of supply.
AC Compressor is designed, dimensioned and released by the GM - HVAC engineering group

taking in consideration the Vehicle Air Conditioned needs.
AC Compressor is driven from the crankshaft front pulley and the maximum torque values

specified in paragraph 3.1.10 shall be taken in consideration.

3.1.16 Crank Shaft Nose Load

Crankshaft maximum load at the nose will not exceed 140 Lbs.

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26

ENGINE APPLICATION MANUAL GM Powertrain

Gasoline 4.3L V6 90 Degree Revised: 08/15/2000

The application engineer can provide information above accessory bracket assemblies available for
various engine applications.

MY-2001 MY-2001 MY-2001 MY-2001 MY-2001

Steering Pump System P-Truck C/K Truck G-Van M/L -Van S/T Truck

( 9E )

Steering Pump 26042592 15772602 26070078 26057292 26058060

26068923 26070099
26081015

15754215/16
Steering Pump Pulley 10085755 10085755 10085755 10085755 10085755
Steering Pump Bracket RR 10236998 10236998 10236998 N/A 10236998
Steering Pump Reservoir 15682455 N/A 26073040/1 26057780 N/A
Steering Pump Cooler 26063303/5 26063303/5 26063303/5 N/A N/A
Steering Pump Hose 3931898 26051184 26040765 26057733 26057936
Steering Pump Hose 3773687 26068830 26063303 26063303 26042259
Steering Pump Hose 3786228 N/A N/A 26055306 26055306
Steering Pump Strap 11501907 N/A N/A 11509086 11509086
Steering Pump Pipe 15983287 26051176 26051176 26050743 15159570
Steering Pump Clamp 11516255 11516255 11516223 15735493 22514443
Steering Pump Bracket Nut 10242827 10242827 10242827 10242827 10242827
Steering Pump Stud 10224557 10224557 10224557 10224557 10224557
Steering Pump Nut 10242827 10242827 10242827 10242827 10242827
Steering Pump Bolt 11516349 11516349 11516349 11516349 11516349
Steering Pump Bolt 10244162 10244168 10244168 10244168 10244168
Steering Pump Bolt 11517950 11517950 11517950 11517950 11515586
Steering Pump Bolt 52476687 52476687 52476687 52476687 52476687

HVAC Compressor ASM P-Truck C/K Truck G-Van M/L -Van S/T Truck

( 1A 2G )

Compressor 1136580 15766590 15766591 15765192 15765201/2
Brace N/A N/A N/A 12555015 N/A
Bolt Screw 11516285 11516285 11516285 11516285 11516285
Bolt Screw N/A 11516704 N/A 11516246 N/A
Bolt Screw N/A N/A N/A 10157953 N/A
Engineer WE08 XS03-U101 0AHD U101 0UR1-U101
Bracket HVAC ASM ( 9E ) 12554522 12554522 12554522 12554522 12554522

Generator ASM

( 6Y1 ) P-Truck C/K Truck G-Van M/L -Van S/T Truck

Alternator 10480270/1 10480388/90 15768829/30 10480326 10480288
Screw/Bolt Alternator 11516704 11516704 11516285 11516285 11516285
Screw/Bolt Alternator 11516283 11516283 11516283 11516283 11516283
Screw/Bolt Tensioner 10244168 10244168 10244168 10244168 10244168
Nut Tensioner 10242827 10242827 10242827 10242827 10242827
Stud Tensioner 10224557 10224557 10224557 10224557 10224557
Generator Bracket Rr 10237271 N/A N/A N/A N/A
Screw/Bolt Bracket Rr 11516284 N/A N/A N/A N/A
Bolt Screw
Bolt Screw
Engineer WE08 UT06 OAKQ UQ12 UT06
Bracket ASM 10236997 10236997 10236997 10236997 10236997

Table 3.1.11-I Accessory Drive Brackets Components Combination

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27