PCS 4LHD, 4LHDX Application Manual
PCS 4LHD/4LHDX APPLICATION GUIDE
Ph: 1.804.227.3023 | www.powertraincontrolsolutions.com
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PREFACE
This manual assists the reader in the applications of the 4LHD/4LHDX transmission to vehicle systems. It gives an
overview of the transmission characteristics, as well as focusing on the interface systems between the transmission and
vehicle. The performance of the transmission is dependent on the vehicle design and integration of the interface systems.
This manual is divided into three sections:
Section 1 Transmission Specications and Attributes: Includes guidelines that describe the transmission’s
internal features, external features, performance limitations, and functionality options.
Section 2 Transmission to Vehicle Interfaces: Denes the transmission integration subsystem characteristics,
options, limitations, and integration requirements.
Section 3 Production Line Procedures: Describes transmission installation and transmission handling methods.
Adhering to the requirements set forth in this document is imperative to proper transmission system operation.
All dimensions and values in this manual are for reference only. Refer to the appropriate transmission installation detail
drawing(s) for denitive information.
For more detailed information on the Transmission Control Module (TCM), calibration process, and diagnostic procedures
refer to your TCM manual, as an example the PCS TCM2600 Manual.
For more detailed information on transmission maintenance, diagnostic, and troubleshooting procedures please refer to
the latest version of the PCS 4LHD/4LHDX Technician’s Guide.
Additional information for PCS provided kits and their part numbers are available in the latest version of the PCS OEM
Parts Catalog.
Powertrain Control Solutions
10511 Old Ridge Rd.
Ashland, VA 23005
+1 (804) 227-3023
support@ptcs.us
Table of Contents
Section 1: Transmission Specications and Attributes ...................................................................................................................................... 1 - 18
Section 1.1 General Description .................................................................................................................................................................. 1 - 4
Section 1.1.1 Identication ................................................................................................................................................................2
Section 1.1.2 Feature Locations .......................................................................................................................................................3
Section 1.1.3 Gear Ratios .................................................................................................................................................................4
Section 1.2 Physical Specications ............................................................................................................................................................. 4 - 7
Section 1.2.1 Mass Properties ..........................................................................................................................................................4
Section 1.2.2 Driveline Lengths ........................................................................................................................................................5
Section 1.2.3 Center of Gravity ................................................................................................................................................... 6 - 7
Section 1.2.4 Inertia Properties .........................................................................................................................................................7
Section 1.2.4 Gross Vehicle Weight (GVW) ......................................................................................................................................7
Section 1.3 Maximum Performance Limitations .........................................................................................................................................8 - 11
Section 1.3.1 Torque Limitations .......................................................................................................................................................8
Section 1.3.2 RPM Limitations ..........................................................................................................................................................9
Section 1.3.3 Acceleration Limitations ..............................................................................................................................................9
Section 1.3.4 Temperature Limitations ............................................................................................................................................10
Section 1.3.5 Grade Limitations ......................................................................................................................................................11
Section 1.4 Valvebody Features and Specifcations ........................................................................................................................................12
Section 1.4.1 Abuse Protection .......................................................................................................................................................12
Section 1.4.2 Neutral Idle ................................................................................................................................................................12
Section 1.4.3 Electronic Range ........................................................................................................................................................12
Section 1.4.4 Inching Mode .............................................................................................................................................................12
Section 1.5 Electrical Specications ........................................................................................................................................................ 13 - 18
Section 1.5.1 Solenoids .......................................................................................................................................................... 13 - 16
Section 1.5.2 Internal Wiring ................................................................................................................................................... 17 - 18
Section 2: Transmission to Vehicle Interfaces .................................................................................................................................................... 19 - 69
Section 2.1 Transmission Input ............................................................................................................................................................... 19 - 30
Section 2.1.1 Torque Converters ............................................................................................................................................. 19 - 23
Section 2.1.2 Flexplate ....................................................................................................................................................................24
Section 2.1.3 Flywheel Interface .....................................................................................................................................................25
Section 2.1.4 Bellhousing to Flywheel Housing Interface ....................................................................................................... 26 - 30
Section 2.2 Transmission Output ............................................................................................................................................................ 31 - 39
Section 2.2.1 Lubrication and Sealing .............................................................................................................................................31
Section 2.2.2 Output Shaft Requirements ............................................................................................................................... 31 - 32
Section 2.2.3 Extension Housings .......................................................................................................................................... 32 - 39
Section 2.3 Transmission Cooling .......................................................................................................................................................... 40 - 52
Section 2.3.1 Cooling System Overview .........................................................................................................................................40
Section 2.3.2 Cooler Requirements .................................................................................................................................................41
Section 2.3.3 Cooler Lines ...................................................................................................................................................... 41 - 42
Section 2.3.4 Dipstick ......................................................................................................................................................................43
Section 2.3.5 Overow Vent ............................................................................................................................................................44
Table of Contents
Section 2.3.6 Fluid Capacity ...........................................................................................................................................................45
Section 2.3.7 Check Fluid Level .............................................................................................................................................. 45 - 47
Section 2.3.8 Fluid Change ..................................................................................................................................................... 48 - 52
Section 2.4 Transmission Shift Lever ..................................................................................................................................................... 53 - 60
Section 2.4.1 Shaft Specs ...............................................................................................................................................................54
Section 2.4.2 Lever Specs ....................................................................................................................................................... 55 - 58
Section 2.4.3 Electronic Range ................................................................................................................................................ 59 - 60
Section 2.5 TCM Interface ....................................................................................................................................................................... 61 - 67
Section 2.5.1 TCM Overview .................................................................................................................................................. 61 - 62
Section 2.5.2 Vehicle Electrical Interface and Diagnostics ...................................................................................................... 63 - 66
Section 2.5.3 Harness Overview .....................................................................................................................................................67
Section 2.6 Throttle Position Sensor ....................................................................................................................................................... 68 - 69
Section 3: Production Line Procedures ............................................................................................................................................................... 70 - 73
Section 3.1 Assembly Procedures ........................................................................................................................................................... 70 - 71
Section 3.1.1 Storage Requirements ..............................................................................................................................................70
Section 3.1.2 Handling Requirements .............................................................................................................................................70
Section 3.1.3 Assembly Requirements ...........................................................................................................................................71
Section 3.2 End-of-Line Inspection Procedures ..................................................................................................................................... 72 - 73
Section 3.2.1 Pre-Start Checks .......................................................................................................................................................72
Section 3.2.2 Stationary Engine-Off Checks ...................................................................................................................................72
Section 3.2.3 Stationary Engine-Running Checks ...........................................................................................................................73
Section 3.2.4 Test Drive ..................................................................................................................................................................73
Section 3.2.5 Post Drive Check ......................................................................................................................................................73
Revision History
03-09-2016 - REV 1.0: Original Release
05-11-2016 - REV 1.1: Addition of torque specications for extension housing, line pressure tap tting, cooler lines, and bellhousing.
SECTION 1
TRANSMISSION SPECIFICATION
AND ATTRIBUTES
Powertrain Control Solutions
CASE
ASSEMBLY
REVERSE
INPUT CLUTCH
INPUT CLUTCH
HOUSING
OVERRUN
CLUTCH
FORWARD
CLUTCH
FORWARD
SPRAG CL
ASSEMBLY
3-4
CLUTCH
INPUT
PLANETARY
GEARSET
LO AND
REVERSE
CLUTCH
TORQUE
CONVERTER
ASSEMBLY
STATOR
ROLLER
CLUTCH
PUMP
ASSEMBLY
LO ROLLER
CLUTCH
ASSEMBLY
REACTION
PLANETARY
GEARSET
TURBINE
SHAFT
2-4
BAND
ASSEMBLY
INSIDE
DETENT LEVER
MANUAL
SHAFT
CONTROL VALVE
ASSEMBLY
PARKING LOCK
ACTUATOR ASSEMBLY
OUTPUT
SHAFT
PARKING
PAWL
SPEED
SENSOR
Section 1. Transmission Specications and Attributes
1.1 General Description
The 4LHD/4LHDX is a fully automatic, electronically controlled, RWD/4WD transmission. It consists primarily of a three
element hydraulic torque converter with a converter clutch, two planetary gear sets, various clutches, an oil pump, and
a control valve body. There are four forward driving gear ranges in addition to neutral, reverse, and park. The torque
converter clutch is available in 2nd, 3rd, and 4th (overdrive) gear. Park range is available in applications that do not
exceed the GVW ratings provided in Section 1.2.5. The mass of a complete system package is estimated to be between
87-113 kg (192-250 lb). This does not include cooler lines, radiator, uid within the external cooling system, shifter cable,
shifter bracket assembly, rear transmission mount isolator, external sensors (such as TPS), and otherwise anything else
vehicle specic not included in Section 1.2.1.
Figure 1.1-1
Abuse
Protection
Solenoid
Abuse
Protection
Solenoid
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4LHD/4LHDX Application Manual
4.4. Transmission and Vehicle Identification
4.4.1. VIN
The following procedure is recommended for VIN operation. Typical locations are shown
in Figure 4.4.1-1.
1. Scan bar-code on transmission.
2. Place etcher on transmission in designsted GMPT approved VIN number area or
use hand stamp and imprint VIN number into transmission in designated GMPT
approved area.
1.1.1 Identication
The transmission nameplate is used to identify the transmission model as well as build date and manufacturing site. A
typical nameplate is shown and dened in Figure 1.1.1-2.
Located on
top side of
transmission
Behind TCM
bracket on
LH side
Figure 1.1.1-1 Transmission I.D. Nameplate Locations
Figure 1.1.1-2 Transmission I.D. Nameplate Features
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Powertrain Control Solutions
ATTACHMENT
1.1.2 Feature Location Illustrations
The following gures show all external components and their locations on the transmission case. Manual shaft, uid
level screw, vent cap, output vehicle speed sensor, bottom pan, electrical pass-through connector, cooler line attachment
interface and powertrain mount boss provisions are shown in these diagrams.
FLARE OR QUICK CONNECT
TRANSMISSION CASE
➤
➤
SPEED
SENSOR
VEHICLE
MOUNTING PAD
FROM COOLER
AIR BREATHER (VENT)
➤
➤
➤
➤
TO COOLER
➤
➤
➤
➤
➤
TRANSMISSION
OIL PAN
TRANSMISSION CONTROL
CONNECTOR
HEAT SHIELD LOCATION (S)
ENGINE FACE
➤
➤
➤
FILL TUBE
HOLE
Figure 1.1.2-1: PCS 4LHD/4LHDX with GM GEN III Bellhousing and 2WD Extension Housing (Right Side View)
Page 3
LINE
PRESSURE
TAP
OUTPUT
SHAFT
➤
➤
TORQUE
CONVERTER
➤
➤
➤
➤
➤
TRANSMISSION OIL PAN
TRANSMISSION SHIFT LEVER
(MANUAL SHAFT)
ATTACHMENT BOSSES FOR
EXTERNAL POSITION SWITCH
➤
CASE
EXTENSION
Figure 1.1.2-2: PCS 4LHD/4LHDX with GM GEN III Bellhousing and 2WD Extension Housing (Left Side View)
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1.1.3 Gear Ratios
Gear Ratio
1st 3.059:1
2nd 1.625:1
3rd 1.000:1
4th 0.696:1
Reverse 2.294:1
1.2 Physical Specications
1.2.1 Mass Properties
Transmission Mass As Installed
4LHD/4LHDX 75 kg (165 lbs)*
* This can vary +/- 3kg (6.6lbs) based on torque converter and output shaft
4LHD/4LHDX Application Manual
Bellhousing Mass As Installed
GM Gen III 4.9 kg (10.8 lbs)
C6 Replacement 5.2 kg (11.5 lbs)
SAE3 5.2 kg (11.5 lbs)
SAE4 4.5 kg (9.9 lbs)
SAE5 7.3 kg (16.1 lbs)
Extension Housing Mass As Installed
GM 2WD 1.8 kg (4.0 lbs)
GM 4WD 2.4 kg (5.3 lbs)
PCS Parking Brake 10.2 kg (22.5 lbs)*
C6 Replacement 4.3 kg (10.1 lbs)**
* Mass measured without drive shaft ange
** Mass measured without C6 brake housing and drum brakes
Accessory Mass As Installed
Transmission Harness 0.7 kg (1.6 lbs)*
Dipstick Kit 0.4 kg (0.9 lbs)
Heat Shield Kit 0.4 kg (0.9 lbs)
Controller (TCM) 0.3 kg (0.7 lbs)
TCU Bracket Kit 0.5 kg (1.1 lbs)
Overow Vent Kit 0.2 kg (0.5 lbs)
Flexplate Kit 1.8 kg (4.0 lbs)
Flywheel Adapter 8.8 kg (19.4 lbs)**
* This can vary +/- 0.3kg (0.7lbs) based on vehicle application
** This can vary +/- 4.0kg (8.8lbs) based on ywheel application
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Powertrain Control Solutions
1.2.2 Driveline Lengths
For an example, the following dimensions are based on the GM 2WD extension housing. For other extension housing
lengths, reference Section 2.2.3.
➤
D
➤
TRANSMISSION ASM.
(TWO-PIECE CASE)
2WD
➤
➤
➤
➤
Figure 1.2.2-1: PCS 4LHD/4LHDX with GM GEN III Bellhousing and 2WD Extension Housing Dimensions
➤
A
➤
B
E
C
➤
➤
➤
F
➤
Type DIM (mm) A B C D E F
GM GEN III Bell 176.3 259.2 618.0 794.3 568.0 226.3
C-6 Bell 142.3 225.2 584.0 760.3 534.0 266.3
SAE 3 Bell 189.0 271.9 630.7 807.0 580.7 266.3
SAE 4 Bell 189.0 271.9 630.7 807.0 580.7 266.3
SAE 5 Bell 189.0 271.9 630.7 807.0 580.7 266.3
A = Bellhousing Length
B = Engine Face to Manual Shaft Distance (C = Engine Face to Vehicle Mount Distance)
C = Engine Face to Vehicle Mount Distance
D = Overall Length (Engine Face to Rear Face of Extension)
E = Length of Case Dimension
F = Length of Extension Housing
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1.2.3 Center of Gravity
4LHD/4LHDX Application Manual
Object Weight X Y Z
83.9 kg (185.00 lb) -253 mm (-9.96 in) 3 mm (.12 in) 17 mm (.67 in)
Figure 1.2.3-1 4LHD/4LHDX with 2WD Extension Housing
Object Weight X Y Z
85.28 kg (188.00 lb) -251 mm (-9.90 in)
Figure 1.2.3-2 4LHD/4LHDX with 4WD Extension Housing
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10 mm (.40 in) 18 mm (.70 in)
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1.2.3 Center of Gravity Cont’d
Approximate location of CG; actual location will depend on transmission model. Contact PCS if actual is desired.
258 mm Torque Converter
2WD 4WD
X -253 mm -251 mm
Y 3 mm 10 mm
Z 17 mm 18 mm
1.2.4 Inertia Properties
Approximate location of CG; actual location will depend on transmission model. Contact PCS if actual is desired.
Rotational Inertia
lxx = 0.94 kg-m
lyy = 2.93 kg-m
lzz = 2.99 kg-m
2
2
2
Approximate values, dependent on transmission model.
Reference: SAE Engine Coordinate System or gures found in Section 1.2.3-1
Rotational Inertia
1st gear 0.0547 kg-m
2nd gear 0.039616 kg-m
3rd gear 0.02553 kg-m
4th gear 0.06692 kg-m
Referred to the input shaft of the transmission without torque converter, transfer case, or parking brake.
2
2
2
2
1.2.5 Gross Vehicle Weight
GVW
3,900 kg (8,600 lb) maximum*
*This gure is limited by the strength of the parking pawl. If other parking mechanisms are utilized, and the transmission is not shifted into park, higher
GVWs are possible. Contact PCS for vehicle calculations in this case.
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1.3 Maximum Performance Limitations
1.3.1 Torque Limitations
Engine Input Torque
4LHD with 258 MM Converter - 340 Nm (250 lb-ft) Maximum
4LHDX with 300 MM Converter - 542 Nm (400 lfb-ft) Maximum
Gearbox Input Torque
4LHD with 258 MM Converter - 660 Nm (487 lb-ft) Maximum
4LHDX with 300 MM Converter - 1057 Nm (780 lb-ft) Maximum
Torque Converter Capacity - Speed
258 mm: 7,000 RPM @ 690 kPa (100 psi), 6500 RPM @ 1020 kPa (150 psi)
300 mm: 7,000 RPM @ 900 kPa (130 psi)
Torque Converter Capacity - Input Torque
258 mm: 340 Nm (250 lb-ft)
300 mm: 542 Nm (400 lb-ft)
4LHD/4LHDX Application Manual
Torque Converter Capacity - Stall Power
258 mm: 79.1 kW (106 hp)
300 mm: 124.6 kW (167 hp)
NOTE: Values @ 690 kPa (100 psi), increase limit by 0.75 kW/14 kPa (1 hp/psi), not to exceed 1020 kPa (150 psi).
To calculate stall power:
(engine stall speed) x (engine torque at stall)
9546
Torque Converter Capacity - Turbine Torque
258 mm: 632 Nm (392 lb-ft)
300 mm: 943 Nm (696 lb-ft)
NOTE: Must verify adequate spline engagement. Reference Section 2.1.1.
Calculated: (engine torque) x (converter ratio)
Torque Converter Capacity - Stator Torque
258 mm: 340 Nm (250 lb-ft)
300 mm: 542 Nm (400 lb-ft)
Calculated: (engine torque) x [ (converter ratio) - 1 ]
Torque Converter Capacity - Max TCC Apply Pressure
258 mm: 930 kPa (135 psi)
300 mm: 862 kPa (125 psi)
Minimum pressure, all operating conditions 415 kPa (60 psi).
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Powertrain Control Solutions
1.3.2 RPM Limitations
Maximum Speed in Park and Neutral
Maximum engine speed cannot exceed 4,000 RPM when the transmission is in park or neutral.
Maximum Shift Speed
The maximum shift speed allowed is application dependent. Note: These maximum shift speeds are dependent on
nal drive ratio, torque converter stall torque ratio, and the engine torque curve prole. Consult with Powertrain Control
Solutions for application specic maximum shift speeds.
Minimum Engine Idle Speed
600 RPM when ATF is above 115˚C (240˚F)
550 RPM when ATF is 0˚C to 115˚C (32˚F to 240˚F)
700 RPM when ATF is below 0˚C (32˚F)
Minimum TCC Apply
Minimum TCC apply speeds are dictated by powertrain and chassis response in the following ranges at normal operating
temperatures.
Engine Engine RPM (Light Throttle) Engine RPM (Heavy Throttle)
All 1000 1800
Maximum Output Speed
Maximum output speed is 7,200 RPM.
Maximum Vehicle Speed
Maximum vehicle speed is dependent on nal drive ratio, torque converter ratio and engine torque curve prole. Powertrain
Control Solutions must be consulted for application specic maximum speeds.
1.3.3 Acceleration Limitations
The 4LHD/4LHDX automatic transmission has been tested for longitudinal and lateral acceleration capability in vehicles
under the following maneuvers at the entire temperature range:
W.O.T. acceleration on level road. Panic stop from 30 mph followed by W.O.T. acceleration.
Longitudinal
Lateral
Gradual stop from 30 mph followed by W.O.T. acceleration.
Right turn at 20 mph with W.O.T. acceleration. Left turn at 20 mph with W.O.T. acceleration. Right
turn panic stop from 20 mph. Left turn panic stop from 20 mph. Continuous right turn at 60 ft turning
radius. Continuous left turn at 60 ft turning radius.
*W.O.T = Wide Open Throttle
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4LHD/4LHDX Application Manual
1.3.4 Temperature Limitations
Functional Range: -40˚C to 55˚C (-40˚F to 131˚F)
Dened as the ambient range where the vehicle will function without causing transmission operational concerns or thermal
distress in adequately cooled installations.
Underbody Temperature
Life of the transmission gaskets, seals and connectors is affected by elevated temperatures. Airow around the
transmission and the proximity to heat sources such as catalytic converter or exhaust system inuence the temperature
build up at the transmission surface. It should be noted that shift cable systems are also sensitive to heat, and should be
routed to avoid extreme temperatures.
Temperatures shall be monitored during testing to ensure appropriate temperature levels. A thermal packaging study is
recommended to verify all underbody temperatures.
Component Skin Temperature Limits
The following maximum temperatures are based on released component materials. These temperatures must not be
exceeded during test.
Exposed Area Maximum Continuous Maximum Excursion
External Seals 138°C (280°F) 150°C (302°F)
Oil Pan Gasket 138°C (280°F) 150°C (302°F)
Trans. Based on Non Metallic Connectors 138°C (280°F) 138°C (280°F)
Trans. Electrical Terminals 135°C (275°F) 135°C (275°F)
Trans. Wiring Harness 125°C (257°F) 125°C (257°F)
Controller (TCM) 105°C (221° F) 125°C (257°F)
* Reference Section 2.3 for cooler requirements and transmission sump operating temperatures.
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Powertrain Control Solutions
Heat Shield
Shown in Figure 1.3.4-1 is an available heat shield that protects the gasket, connector, and accumulator from common
exhaust positions. Consult with PCS if this is necessary or adequate for your application.
Figure 1.3.4-1: Heat Shield Exploded View
1.3.5 Grade Limitations
Maximum Grade for Hydraulic Operation
This transmission is validated to operate on longitudinal and lateral slopes of up to 30% (16.7 degree grade) without
detrimental effect on the operation of the hydraulic system at normal working temperature. Consult with Powertrain
Control Solutions if the proposed application exceeds these values.
Maximum Grade for Park System
There is a maximum grade capability of 30% (16.7 degree grade) for park pawl engagement with both the park mechanism
engaged and the parking brake on.
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4LHD/4LHDX Application Manual
1.4 Valve body Features and Specications
The following are valve body options. When ordering from PCS, you must specify your desired valve body conguration.
1.4.1 Abuse Protection
Often times the operator causes the most damage to the transmission, reducing the service life and causing
costly repairs and downtime. The PCS 4LHD/4LHD-X abuse protection valve body protects the transmission by
locking out reverse engagement until the vehicle is stopped and the engine is at idle. It also prevents “neutral
drops” by only engaging the forward gears when the engine is at idle.
1.4.2 Neutral Idle
As an option, the PCS valve body can disengage the forward gears when the vehicle is stopped and the brake
pedal is pressed. By reducing the number of rotating components during idle, fuel consumption can be reduced
especially for vehicles that spend a lot of time idling in gear. With the forward gears disengaged, the reduced
brake force required to hold the vehicle, especially in high gear reduction drivelines, can signicantly improve the
drivability of the vehicle from the operator’s perspective.
1.4.3 Electronic Range (Option)
This allows you to eliminate the shift cable and shift the transmission electronically with a push button or a
movement of a lever. Driver inputs can be validated based on vehicle modes and conditions so the vehicle is
operated within standard operating protocols. Also eliminate transmission failures due to the shift cable not
adjusted properly. Reference Section 2.4.3 for external setup.
1.4.4 Inching Mode (Option)
The PCS inching valve body allows the operator to move the vehicle forward or backward in small increments
from an operator’s panel remotely mounted on the vehicle. This greatly reduces time when connecting to trailers
or other equipment and makes the operation more efcient for one person.
Page 12
Figure 1.4-1: PCS Valve Body Explosion View
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Powertrain Control Solutions
1.5 Electrical Specications
1.5.1 Solenoids
Shift
Range Gear
Park
Reverse
Neutral
OD
D
2
1
1. Shift solenoid state is a function of vehicle speed and may change if vehicle speed increases.
2. Manual Second - First gear is electronically prevented under normal operating conditions.
3. Solenoid state will be opposite shown during abuse protection
2nd OFF ON ON 3OFF Applied Applied Holding
2nd OFF ON ON 3OFF Applied Applied Holding
1st 2ON ON ON 3OFF Applied Applied Holding Holding
2nd OFF ON ON 3OFF Applied Applied Applied Holding
2nd OFF ON ON 3OFF Applied Applied Applied Holding
Solenoid
1-2 2-3 FWD REV
ON 1ON 1OFF OFF Applied
ON 1ON 1ON ON
ON 1ON 1ON ON
1st ON ON ON 3OFF Applied Holding Holding
3rd OFF OFF ON 3OFF Applied Holding Applied
4th ON OFF ON 3OFF Applied Applied Applied
1st ON ON ON 3OFF Applied Holding Holding
3rd OFF OFF ON 3OFF Applied Applied Holding Applied
1st ON ON ON 3OFF Applied Applied Holding Holding Applied
Abuse
Solenoid
Reverse
2-4
Band
3
Input
Clutch
Applied Applied
Overrun
Clutch
Forward
Clutch
Forward
Sprag CL.
Assembly
3-4
Clutch
LO/
Roller
Clutch
LO/REV
Clutch
Shift Solenoids
The two identical shift solenoids are two port, on/off solenoids (normally on) that are used to control the shift
change events.
• The shift solenoid coil resistance should be 20-40 ohms at 20.0 +/- 5.0°C.
• The shift solenoid current ow should not exceed 0.75 Amps.
• The shift solenoid energizes at 7.5 volts or more.
• The shift solenoid de-energizes at 1.0 volts or less.
TCC Enable Solenoid
The TCC Enable Solenoid is a two port, on/off solenoid (normally on) that is used to apply and release pressure
to the Torque Converter Clutch.
• The TCC Enable Solenoid coil resistance should be 20-40 ohms at 20.0 +/- 5.0°C.
• The TCC Enable Solenoid current should not exceed 1.5 Amps.
TCC Control Solenoid
The TCC Control Solenoid is a three port (normally closed) device used to control the apply and release pressure
of the Torque Converter Clutch. Adujsting this in the TCU Calibration changes the shift rmness of the Torque
Converter Clutch.
• The TCC Control Solenoid operates at a xed frequency (negative duty cycle) of 32 Hz.
• The TCC Control Solenoid coil resistance should be 10.0 - 11.5 Ohms when measured at 20.0 +/- 5.0°C.
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4LHD/4LHDX Application Manual
➤
TIME
VOLTS
12
0
1 CYCLE = 1/292.5 SECOND
➤
➤
40%
60%
➤
➤
➤
➤
➤
(ON)
PRESSURE CONTROL SOLENOID VALVE POSITIVE DUTY CYCLE
PRESSURE CONTROL SOLENOID VALVE
➤
➤
➤
➤
➤
➤
➤
➤ ➤ ➤
➤
➤ ➤ ➤
➤
➤
➤
➤
➤
➤ ➤ ➤ ➤
➤
➤
➤
➤
➤
➤
➤
PUSH
ROD
FRAMESPRING
SPOOL
VALVE
ACTUATOR
FEED
LIMIT
FLUID
TORQUE
SIGNAL
FLUID
COIL
ASSEMBLY
EXHAUST ARMATURE
DAMPER
SPRING
FLUID
SCREENS
SPOOL
VALVE
SPRING
VARIABLE
BLEED
ORIFICE
SPOOL
VALVE
SLEEVE
PLNGR
54
54
54
21
CNTRL
PRESS
SHIFT
20
21
9
54
54
54
54 54
SHIFT
PRESSURE CONTROL
SOLENOID VALVE
(SLS) (340)
1111
11
FLUID PRESSURE
TEST HOLE PLUG (334)
SHIFT PRESSURE CONTROL SOLENOID VALVE (SLS)
EXHAUST
EXHAUST
CONNECTOR
COIL
ASSEMBLY
SPOOL
VALVE
SPRING
PLUNGER
PRESSURE
SUPPLY
(SOLENOID
MODULATOR)
PRESSURE
CONTROL
(SHIFT
CONTROL)
VALVE
Abuse Protection Solenoid (Non-Electronic Range)
The identical Forward/Reverse Abuse Protection Solenoids (Non-ER) three port linear pressure control solenoids
(normally open).
• The Non-ER Forward/Reverse solenoids coil resistance is 5.0-5.6 ohms at 25.0 +/- 1.0°C.
• The Non-ER Forward/Reverse solenoids operate at a xed frequency of 300Hz.
160
140
120
100
80
60
Abuse Protection Solenoid (Electronic Range)
The two identical ER Forward/Reverse Abuse Protection solenoids are three port PWM (Pulse Width Modulation)
solenoids (normally closed).
• The ER Forward/Reverse solenoids operate at a xed frequency (negative duty cycle) of 32 Hz.
• The ER Forward/Reverse solenoids coil resistance should be 10.4-10.8 Ohms when measured at 20.0 +/- 5.0°C
• The ER Forward/Reverse solenoids coil resistance should be approximately 16 Ohms when measured at 150 +/-
5.0°C.
Pressure Control Solenoid
The Pressure Control Solenoid is a three port electronic pressure regulator used to control line pressure. When the
solenoid is off, line pressure is unrestricted from the line pressure pump. When the solenoid is on, line pressure is
restricted to the values shown in the chart. A line pressure tap is available. The torque rating for this tting is 8 lb*ft / 11
N*m. Reference Figure 2.4.6.1-3.
• The Pressure Control Solenoid operates at a xed frequency of 292.5 Hz.
• The Pressure Control Solenoid coil resistance is 3.5-4.6 Ohms at 20.0 +/- 5.0°C.
40
CONTROL PRESSURE (PSI)
20
0
0.0
Figure 1.5.1-1: Abuse Protection Solenoid Valve Current Flow
100
90
80
70
60
0.1 0.2 0.3 0.4
50
40
30
20
CONTROL PRESSURE (PSI)
10
0
0.0
Figure 1.5.1-2: Pressure Control Solenoid Valve Current Flow
INPUT CURRENT (AMP)
0.1 0.2 0.3 0.4
0.60.5 0.7 0.8 0.9
0.60.5 0.7 0.8 0.9
INPUT CURRENT (AMP)
1.0 1.1
1.0 1.1
Page 14
REV 1.1
10511 Old Ridge Rd. Ashland, VA 23005
Ph: 804.227.3023
TEMPERATURE SENSOR
VEHICLE SPEED SENSOR
FIGURE A: CONDITIONED SIGNAL
OUTPUT VOLTS
LOW SPEED
➤
5.0
HIGH SPEED
TIME
-50 -30 -10 10 30 50 70 90 110 130 150
110
100
90
80
70
60
50
40
30
20
10
0
Sensor Resistance (K ohms)
Temperature C
SENSOR RESISTANCE VS. TEMPERATURE
CONNECTOR RESISTOR
TRANSMISSION
FLUID PRESSURE
MANUAL VALVE
POSITION SWITCH
ASSEMBLY (69)
ELECTRICAL
CONNECTOR
MAGNETIC PICKUP
TRANSMISSION FLUID TEMPERATURE (TFT) SENSOR
The temperature sensor is a negative temperature coefficient
thermistor (temperature sensitive resistor) that provides
information to the PCM regar ding transmission fluid
temperature. The temperature sensor is a part of the
transmission fluid pressure (TFP) manual valve position switch
assembly which is attached to the control valve body and
submersed in fluid in the transmission bottom pan. The
internal electrical resistance of the sensor varies in relation to
the operating temperature of the transmission fluid (see chart).
The PCM sends a 5 volt reference signal to the temperature
sensor and measures the voltage drop in the circuit. A lower
fluid temperature creates a higher resistance in the temperature
sensor, thereby measuring a higher voltage signal.
The PCM measures this voltage as another input to help
control TCC apply and line pressure. The PCM inhibits
TCC
apply until transmission fluid temperature reaches
approximately 29°C (84° F). Also, when fluid temperatures
exceed 135° C (275°F), the PCM commands TCC apply at
all times in Fourth gear, as opposed to having a scheduled
apply. Applying the TCC reduces fluid temperatures created
by the fluid coupling in the converter.
pickup on the VSS. Whenever the vehicle is moving, the
VSS produces an AC voltage proportional to vehicle speed.
This AC signal is sent to the digital ratio adaptor converter
(DRAC) where it is converted to a direct current (DC) square
wave form. The DC signal is then sent to the PCM and
interpreted as vehicle speed. As vehicle speed increases and
more rotor teeth pass by the magnetic pickup on the VSS in
a given time frame, the frequency of the DC signal sent to
the PCM increases. The PCM interprets this increase in
frequency as an increase in vehicle speed (see Figure A).
Note: On f
our wheel drive (4WD) applications the VSS is
located on the transfer case.
Vehicle Speed Sensor Circuit Low will set DTC P0502 and the
PCM will command the following default actions:
• Freeze shift adapts.
• Maximum line pressure.
• Calculate A/T OSS from A/T ISS sensor output.
• DTC P0502 stores in PCM history.
TFT Sensor Circuit Range/Performance will set DTC P0711
and the PCM will command the following default actions:
• Freeze shift adapts.
• Defaults the TFT to 140°C (284°F) for shift
scheduling (hot mode pattern).
• DTC P0711 stores in PCM history.
Powertrain Control Solutions
Transmission Fluid Temperature Sensor
• The Transmission Fluid Temperature Sensor is a negative temperature coefcient temperature sensitive resistor that
drops an input 5V signal to the values shown below.
• The Transmission Fluid Temperature Sensor voltage range is 5.0-0.0V DC.
Internal Mode Switch (IMS)
The internal mode switch (IMS) is a sliding contact switch attached to the manual shift shaft inside the transmission. The
ve inputs to the TCM from the transmission manual shift shaft switch assembly indicate the transmission gear selector
lever position. Refer to this pinout in Figure 1.5.2-2.
Transmission Input Speed Sensor (TISS)
Mounted within the pump, the Transmission Input Speed Sensor (TISS) contains an AC-coupled Hall-effect chip that
switches in response to changing differential magnetic elds created by rotating ferrous targets and requires a constant
supply voltage between 4.0 and 26.5 volts to operate. The signal is induced by a 15 tooth spline on the turbine shaft
(a.k.a. input shaft).
Page 15
Figure 1.5.1-3: Sensor Resistance vs. Temperature
REV 1.1
10511 Old Ridge Rd. Ashland, VA 23005
Ph: 804.227.3023
4LHD/4LHDX Application Manual
Output Speed Sensor (VSS)
The Output Speed Sensor (also known as Vehicle Speed Sensor) is a variable reluctance magnetic pickup which receives
a sin wave from a speed gear on the output shaft and generates a square wave output. The sensor requires a two wire
connector from the Extension Housing to the TCM.
• The output speed sensor coil resistance is 1850-2250 ohms at 25.0 +/- 1.0°C.
• The maximum output speed sensor inductance is 2000 mH at 1000 Hz with 50 mA applied.
• The speed sensor will produce a minimum voltage (loaded) of 0.25 V peak positive and 0.25 negative at minimum
speed of 100 RPM.
• The speed sensor will produce a maximum voltage (loaded) of 100 V peak positive and 100 negative at a maximum
speed of 7200 RPM.
• All available GM and PCS extension housings use a symmetrical 40 tooth speed gear on the output shaft, resulting in
40 pulses per revolution to the TCM.
NEGATIVE TERMINAL
POSITIVE TERMINAL
➤
➤
Figure 1.5.1-4: Speed Sensor Connector
Pass-Thru Connector
The transmission to vehicle electrical interface is a 20 pin connector used to mate the internal and external harnesses of
the transmission. Use the alignment key to ensure proper installation. Reference Figure 1.5.2-1.
• The pass-thru connector envinromental temperature shall not exceed -40 to 135°C at any time. Proper shielding is
required. Reference Section 1.3.4 for temperature details.
Page 16
REV 1.1
10511 Old Ridge Rd. Ashland, VA 23005
Ph: 804.227.3023
Powertrain Control Solutions
1.5.2 Internal Wiring
Unless otherwise specied, electrical components operating range shall be 8.0 to 18.0 VDC. It is recommended that
the transmission controls solenoids are not engaged without the engine running. Transmission electrical components
should be fused separately from other vehicle components.
Electrical Connections
Two connections must be made to the transmission to interface with the TCM. The connections are for the transmission
control connector and the output speed sensor. Figures 1.5.2-1 and 1.5.2-2 shows the internal system schematic.
CAV Function
A Shift SOL ‘A’
B Shift SOL ‘B’
C Line Pressure +
D Line Pressure -
E Switched +12V
F IMS A
G IMS C
H IMS B
J IMS P
K Turbine Speed +
L Trans Temp Sensor
M Trans Temp Sensor Ground
N IMS Ground
P
TCM Connector
R Forward Clutch SOL
S Reverse Clutch SOL
T TCC SOL
U TCC PWM
V Turbine Speed
W Neutral Safety
Page 17
Figure 1.5.2-1: TCM Connector and Terminal Locations
REV 1.1
10511 Old Ridge Rd. Ashland, VA 23005
Ph: 804.227.3023
TRANSMISSION
VALVE BODY
SHIFT
SOLENOID A
SHIFT
SOLENOID B
TCC ENABLE
SOLENOID
(ON/OFF)
TCC CONTROL
PWM SOLENOID
4LHD/4LHDX Application Manual
VEHICLE
CONNECTOR
FORWARD
CLUTCH
SOLENOID
E
A
B
T
D
M
G
H
J
N
K
V
E
A
B
T
U UU
R
S
C
D
L
M
F
G
H
S1
S2
A
B
E
A
B
T
RR
SS
CC
D
LL
M
FF
G
H
J
J
N
N
K
K
V
V
PRESSURE
CONTROL
SOLENOID
P1
‰
‰
OUTPUT
SPEED
SENSOR
TURBINE
SPEED
SENSOR
➤
A
C
B
P
Internal
Mode
Switch
REVERSE
CLUTCH
SOLENOID
TEMP
SENSOR
‰
‰
Page 18
Figure 1.5.2-2: Transmission Electrical Schematic
REV 1.1
10511 Old Ridge Rd. Ashland, VA 23005
Ph: 804.227.3023
SECTION 2
TRANSMISSION TO VEHICLE
INTERFACES
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