Service Manual
Trucks
Group 28
MID 128 Fault Code Guide
2007 Emissions
VN, VHD VERSION2, VT
PV776-20184635
Foreword
The descriptions and service procedures contained in this manual are based on designs and methods studies carried out up to October 2008.
The products are under continuous development. Vehicles and components produced after the above date may therefore have different specifications and repair methods. When this is believed to have a significant bearing on this manual, supplementary service bulletins will be issued to cover the changes.
The new edition of this manual will update the changes.
In service procedures where the title incorporates an operation number, this is a reference to an V.S.T. (Volvo Standard Times).
Service procedures which do not include an operation number in the title are for general information and no reference is made to an V.S.T.
Each section of this manual contains specific safety information and warnings which must be reviewed before performing any procedure. If a printed copy of a procedure is made, be sure to also make a printed copy of the safety information and warnings that relate to that procedure. The following levels of observations, cautions and warnings are used in this Service Documentation:
Note: Indicates a procedure, practice, or condition that must be followed in order to have the vehicle or component function in the manner intended.
Caution: Indicates an unsafe practice where damage to the product could occur.
Warning: Indicates an unsafe practice where personal injury or severe damage to the product could occur.
Danger: Indicates an unsafe practice where serious personal injury or death could occur.
Volvo Truck North America a division of Volvo Group North
America, Inc.
Greensboro, NC USA
Order number: PV776-20184635
Repl: This Service Manual replaces Manual 28 "Fault Code Guide 2007 Emissions" (7.2007) Publication no. PV776–20113992.
© 2008 Volvo Truck North America a division of Volvo Group North America, Inc., Greensboro, NC USA
All rights reserved. No part of this publication may be reproduced, stored in retrieval system, or transmitted in any forms by any means, electronic, mechanical, photocopying, recording or otherwise, without the prior written permission of Volvo Truck North America a division of Volvo Group North America, Inc.
USA32772.ihval
Contents |
|
GROUP 28 ............................................................................................ |
3 |
Design and Function ........................................................................... |
3 |
Engine Control System ........................................................................ |
3 |
Troubleshooting ................................................................................... |
11 |
Engine ECU, Fault Tracing ................................................................... |
11 |
MID 128 PID 26 Fan Speed Percent .................................................... |
14 |
MID 128 PID 45 Preheater Relay ........................................................ |
14 |
MID 128 PID 81 Particulate Filter ........................................................ |
15 |
MID 128 PID 84 Vehicle Speed ........................................................... |
15 |
MID 128 PID 85 Cruise Control Status ................................................ |
15 |
MID 128 PID 91 Accelerator Pedal Position ........................................ |
16 |
MID 128 PID 94 Fuel Delivery Pressure .............................................. |
16 |
MID 128 PID 97 Water in Fuel Indicator .............................................. |
17 |
MID 128 PID 98 Engine Oil Level ........................................................ |
17 |
MID 128 PID 100 Engine Oil Pressure ................................................ |
18 |
MID 128 PID 102 Intake Manifold Pressure ......................................... |
19 |
MID 128 PID 103 Turbo Speed ............................................................ |
20 |
MID 128 PID 105 Intake Manifold Temperature ................................... |
21 |
MID 128 PID 108 Atmospheric Pressure ............................................. |
22 |
MID 128 PID 110 Coolant Temperature ............................................... |
23 |
MID 128 PID 111 Coolant Level .......................................................... |
24 |
MID 128 PID 153 Crankcase Pressure ................................................ |
25 |
MID 128 PID 171 Ambient Temperature .............................................. |
26 |
MID 128 PID 173 Exhaust Temperature .............................................. |
26 |
MID 128 PID 175 Engine Oil Temperature .......................................... |
27 |
MID 128 PID 354 Relative Humidity .................................................... |
28 |
MID 128 PID 411 EGR Exhaust Back Pressure .................................. |
29 |
MID 128 PID 412 EGR Temperature ................................................... |
30 |
MID 128 PPID 35 EGR Mass Flow ...................................................... |
31 |
MID 128 PPID 89 Variable Geometry Turbocharger Smart Remote |
|
Actuator Temperature .......................................................................... |
31 |
MID 128 PPID 122 Engine Compression Brake .................................. |
32 |
MID 128 PPID 270 NOx Sensor .......................................................... |
33 |
MID 128 PPID 272 Air Pressure Compensation .................................. |
34 |
MID 128 PPID 326 Soot Level ............................................................. |
34 |
MID 128 PPID 328 Aftertreatment Injection Shutoff Valve .................. |
35 |
MID 128 PPID 329 Aftertreatment Fuel Injector .................................. |
35 |
MID 128 PPID 330 DRV ...................................................................... |
36 |
MID 128 PPID 337 Ash Level .............................................................. |
37 |
MID 128 PPID 387 Temperature Sensor, Catalytic Converter ............. |
37 |
MID 128 PPID 436 Exhaust Gas Temperature Sensor 3 ..................... |
38 |
MID 128 PPID 437 Aftertreatment Injector Fuel Pressure Sensor ...... |
39 |
MID 128 PSID 47 Particulate Trap Regeneration ................................ |
40 |
MID 128 PSID 98 Boost Air System .................................................... |
40 |
MID 128 PSID 108 Aftertreatment Injection System ........................... |
41 |
MID 128 PSID 109 Engine Coolant Temperature Sensor .................... |
42 |
MID 128 SID 1/2/3/4/5/6 Unit Injector .................................................. |
43 |
MID 128 SID 18 Drain Valve, Water Separator .................................... |
44 |
MID 128 SID 21 Engine Position Timing Sensor ................................. |
45 |
MID 128 SID 22 Engine Speed Sensor ............................................... |
46 |
MID 128 SID 27 Variable Geometry Turbocharger .............................. |
47 |
MID 128 SID 33 Fan Control ................................................................ |
48 |
1
MID 128 SID 70 Preheater Element 1 ................................................. |
48 |
|
MID 128 SID 71 Preheater Element 2 ................................................. |
49 |
|
MID 128 SID 146 |
EGR Valve 1 ............................................................ |
49 |
MID 128 SID 211 |
5 Volt DC Supply ..................................................... |
50 |
MID 128 SID 230 |
Idle Validation Switch 1 ........................................... |
50 |
MID 128 SID 232 |
5 Volt DC Supply to Sensor ..................................... |
51 |
2
Group 28 |
Design and Function |
Group 28
Design and Function
Engine Control System
The “Premium Tech Tool” (PTT) is the preferred tool for performing diagnostic work. Contact your local dealer for more information or visit “www.premiumtechtool.com”.
System Overview
Five electronic control modules are used; the Engine Management System (EMS) Module, Instrument Cluster Module (ICM), Vehicle Electronic Control Unit (VECU), Transmission Electronic Control Unit (TECU) and
the Gear Selector Electronic Control Unit (GSECU). Together, these modules operate and communicate through the J1939 high speed serial data line to control a variety of engine and vehicle cab functions. The Engine Management System (EMS) Module controls fuel timing and delivery, fan operation, engine protection functions, engine brake operation, the EGR valve, and the turbocharger nozzle. The Vehicle Electronic Control Unit (VECU) controls cruise control functions, accessory relay controls and idle shutdown functions. The Instrument Cluster Module (ICM) primarily displays operational parameters and communicates these to the other ECU’s. All have the capability to communicate over the J1587 normal speed data lines primarily for programming, diagnostics and data reporting.
In addition to their control functions, the modules have on-board diagnostic capabilities. The on-board diagnostics are designed to detect faults or abnormal conditions that are not within normal operating
parameters. When the system detects a fault or abnormal condition, the fault will be logged in one or both of the modules’ memory, the vehicle operator will be advised that a fault has occurred by illumination a malfunction indicator lamp and a message in the driver information display, if equipped. The module may initiate the engine shutdown procedure if the system determines that the fault could damage the engine.
In some situations when a fault is detected, the system will enter the "limp home" mode. The limp home mode allows continued vehicle operation but the system may substitute a sensor or signal value that may result in poor performance. In some instances, the system will continue to function but engine power may be limited to protect the engine and vehicle. Fault codes logged in the system memory can later be read, to aid in diagnosing the faults, with a diagnostic computer or through the instrument cluster display, if equipped. When diagnosing
an intermittent code or condition, it may be necessary to use a diagnostic computer connected to the Serial Communication Port.
Additional data and diagnostic tests are available when a diagnostic computer is connected to the Serial Communication Port.
For diagnostic software, contact your local dealer.
The Vehicle Electronic Control Unit (VECU) is mounted on a panel below the top dash access panel in the center of the dash on conventional models. The VECU is a microprocessor based controller programmed to perform several functions, these include:
•Driver controls
•Vehicle and engine speed controls
•Starter control
•Cab power
•Idle controls
•Broadcasting data on the serial data lines
•Trip data logging
•Diagnostic fault logging and password processing
The VECU performs these functions by monitoring the signals from sensors and switches, and data received over the serial data lines from the other ECU’s. The VECU directly monitors the Throttle Position (TP) Sensor and Vehicle Speed Sensor (VSS).
The VECU also monitors the position or state of a number of switches to perform its control and diagnostic functions. They are:
•A/C Pressure Switch
•Air Suspension Height Control Switch
•Differential Lock Switch
•Engine Brake Switches
•Ignition Key Switch
•PTO Switches (if equipped)
•Service and Park Brake Switches
•Speed Control Switches (Set/Decel, Resume/Accel)
•5th Wheel Slide Switch
3
Group 28 |
Design and Function |
The EMS is a microprocessor based controller programmed to perform fuel injection quantity and timing control, diagnostic fault logging, and to broadcast data to other modules. The fuel quantity and injection timing to each cylinder is precisely controlled to obtain optimal fuel economy and reduced exhaust emissions in all driving situations.
The EMS controls the operation of the Electronic Unit Injectors (EUIs), engine brake solenoid, EGR valve, turbocharger nozzle position, and cooling fan clutch based on input information it receives over the serial data lines and from the following sensors:
•Ambient Air Temperature Sensor
•Ambient Pressure sensor
•Boost Air Pressure (BAP) Sensor
•Camshaft Position (Engine Position) Sensor
•Cooling Fan Speed (CFS) Sensor
•Crankshaft Position (Engine Speed) Sensor
•Differential Pressure DPF Sensor
•EGR Differential Pressure Sensor
•EGR Temperature Sensor
•Engine Coolant Level (ECL) Sensor
•Engine Coolant Temperature (ECT) Sensor
•Engine Oil Pressure (EOP) Sensor
•Engine Oil Level (EOL) Sensor
•Engine Oil Temperature (EOT) Sensor
•Exhaust Temperature Sensor (DPF Sensors)
•Fuel Pressure Sensor
•Intake Air Temperature And Humidity (IATH) Sensor
•Intake Manifold (Boost) Temperature Sensor
•Throttle Position (TP) Sensor
•Turbo Speed Sensor
•Variable Geometry Turbocharger (VGT) Position Sensor
The Vehicle Electronic Control Unit (VECU) and Engine Management System (EMS) Module are dependent on each other to perform their specific control functions. In addition to switch and sensor data the broadcast of data between modules also includes various calculations and conclusions each module has developed, based on the input information it has received.
4
Group 28 |
Design and Function |
Sensors
Ambient Air Temperature Sensor
The Ambient Air Temperature Sensor is used to detect the outside air temperature. The sensor modifies a voltage signal from the ECM. The modified signal returns to the ECM as the ambient air temperature. The sensor uses a thermistor that is sensitive to the change in temperature. The electrical resistance of the thermistor decreases as temperature increases.
The Ambient Air Temperature Sensor is located in the front of the vehicle.
Ambient (Atmospheric) Pressure Sensor
The Ambient (Atmospheric) Pressure Sensor contains a pressure sensitive diaphragm and an electrical amplifier. Mechanical pressure applied to the diaphragm causes the diaphragm to deflect and the amplifier to produce an electrical signal proportional to the deflection.
The Ambient (Atmospheric) Pressure Sensor is built into the Engine Management System (EMS) Module.
Camshaft Position Sensor
The Camshaft Position (Engine Position) Sensor is located in the rear face of the timing gear cover at the rear of the engine, near the bottom of the valve cover. It uses magnetic induction to generate a pulsed electrical signal. It senses the passage of seven (7) timing bumps on the edge of the camshaft dampener. Six of the holes correspond to the phasing of the electronic unit injectors, while the seventh hole indicates the top dead center position.
Cooling Fan Speed (CFS) Sensor
On engines with an electronically controlled viscous fan drive, the electronic fan drive contains a Hall effect speed sensor. When the engine is running, a series of vanes in the fan drive housing rotates past a magnet in the fan drive solenoid generating a pulsed voltage signal. The Engine Management System (EMS) Module monitors the status if the air conditioning system and signals from the Engine Coolant Temperature (ECT) Sensor, the Engine Oil Temperature (EOT) Sensor, and the Engine Speed/Timing (RPM/TDC) Sensor and calculates the optimal cooling fan speed.
The Cooling Fan Speed Sensor is located in the fan drive on the front of the engine.
5
Group 28 |
Design and Function |
Crankshaft Position (Engine Speed) Sensor
The Crankshaft Position (Engine Speed) Sensor uses magnetic induction to generate a pulsed electrical signal. Notches are machined into the edge of the flywheel. When one of the notches passes close to the sensor, electric pulses result.
The Crankshaft Position (Engine Speed) Sensor also indicates when the crankshaft is at the top dead center position.
Differential Pressure DP Sensor
The differential pressure sensor is used for flow measurement of the Diesel Particulate Filter (DPF). This sensor has two pressure ports and senses the difference in pressure between the two ports. Measurement of the pressure before and after the DPF is used to calculate diesel filter regeneration.
The Differential Pressure DPF Sensor is located on the side of the Diesel Particulate Filter (DPF).
EGR Differential Pressure Sensor
The EGR differential pressure sensor is used for flow measurement of the Exhaust Gas Recirculation (EGR) valve. This sensor has two pressure ports and senses the difference in pressure between the two ports. Measurement of the pressure before and after the EGR valve is used to calculate EGR flow.
The EGR Differential Pressure Sensor is located on the left or right side of the engine.
EGR Temperature Sensor
The EGR temperature sensor detects exhaust gas temperature for EGR system. The sensor modifies a voltage signal from the control unit. The modified signal returns to the control unit as the exhaust temperature of the EGR system to confirm EGR operation. The sensor uses a thermistor that is sensitive to the change in temperature.
The EGR Temperature Sensor is located near the EGR valve.
Engine Coolant Level (ECL) Sensor
The Engine Coolant Level (ECL) Sensor is a switch. If engine coolant level falls below a calibrated point the contacts open and the driver will be notified of the low coolant level.
The Engine Coolant Level (ECL) Sensor is located in the cooling system reservoir tank.
6
Group 28 |
Design and Function |
Engine Coolant Temperature (ECT) Sensor
The Engine Coolant Temperature Sensor is located at the front of the engine. The sensor will indicate a high coolant temperature caused by problems like radiator blockage, thermostat failure, heavy load, or high ambient temperatures. This sensor is also used for cold start enhancement and for fan clutch engagement.
Engine Oil Pressure (EOP) Sensor
The Engine Oil Pressure Sensor contains a pressure sensitive diaphragm and a electrical amplifier. Mechanical pressure applied to the diaphragm causes the diaphragm to deflect and the amplifier to produce an electrical signal proportional to the deflection.
The Engine Oil Pressure Sensor is located on the oil filter assembly. The sensor monitors engine oil pressure to warn of lubrication system failure.
Engine Oil Level (EOL) Sensor
The Engine Oil Level Sensor is located in the oil pan.
Engine Oil Temperature (EOT) Sensor
The Engine Oil Temperature Sensor is a thermistor whose resistance varies inversely to temperature. The sensor has a negative temperature coefficient, which means the sensor resistance will decrease as the engine oil temperature increases.
The Engine Oil Temperature Sensor is located in the oil pan.
Exhaust Temperature Sensor (DPF Sensors)
The exhaust gas temperature sensor detects exhaust gas temperature for DPF protection as well as DPF regeneration control. The sensor modifies a voltage signal from the control unit. The modified signal returns to the control unit as the exhaust temperature at that specific location of the exhaust. The sensor uses a thermistor that is sensitive to the change in temperature.
The Exhaust Temperature Sensors are located in the
DPF assembly.
Fuel Pressure Sensor
The fuel pressure sensor contains a diaphragm that senses fuel pressure. A pressure change causes the diaphragm to flex, inducing a stress or strain in the diaphragm. The resistor values in the sensor change in proportion to the stress applied to the diaphragm and produces an electrical output.
The Fuel Pressure Sensor is located on top of the fuel filter housing.
7
Group 28 |
Design and Function |
Intake Air Temperature and Humidity (IATH) Sensor
The Intake Air Temperature and Humidity (IATH) Sensor contains a thermistor and a capacitive sensor. The resistance of the thermistor varies inversely to temperature. The output of the capacitive sensor
increases as the humidity of the surrounding air increases. By monitoring the signals from both portions of the sensor, the Engine Management System (EMS) Module calculates the temperature and humidity of the air passing through the air filter housing.
The Intake Air Temperature and Humidity (IATH) Sensor is located in the air intake tube just downstream from the air filter canister.
Intake Manifold (Boost) Temperature Sensor
The Intake Manifold (Boost) Temperature Sensor is a thermistor whose resistance varies inversely to temperature. The sensor has a negative temperature coefficient, which means the sensor resistance will decrease as the inlet air temperature increases.
The Intake Manifold (Boost) Temperature Sensor is located in the intake manifold.
Intake Manifold Pressure Sensor
The Intake Manifold Pressure Sensor contains a pressure sensitive diaphragm and an electrical amplifier. Mechanical pressure applied to the diaphragm causes the diaphragm to deflect and the amplifier to produce an electrical signal proportional to the deflection.
The Intake Manifold Pressure Sensor is located on the air inlet pipe before the intake manifold.
Throttle Position (TP) Sensor
The Throttle Position Sensor is a potentiometer that is mechanically linked to the accelerator pedal. A potentiometer is a variable resistor whose resistance will change as the pedal is pressed. As the resistance changes, the signal voltage of the sensor changes indicating the accelerator pedal position.
The Throttle Position Sensor is located above the accelerator pedal. The sensor is designed to improve the driver’s control by reducing sensitivity to chassis motion. This sensor provides the driver’s fuel request input to the VECU.
Turbo Speed Sensor
The Turbo Speed Sensor informs the EMS of the turbo shaft speed. The sensor does not read from the vanes, but reads from the shaft. The Engine Management System (EMS) Module uses this signal in conjunction with the VGT position sensor signal to control the speed of the turbocharger and therefore optimize the intake manifold pressure.
The Turbo Speed Sensor is mounted in the center of the turbocharger.
8
Group 28 |
Design and Function |
Variable Geometry Turbocharger Smart Remote Actuator (VGT SRA)
The Variable Geometry Turbocharger Smart Remote Actuator (VGT SRA) takes the position commands from the EMS, moves the nozzle of the turbocharger to the desired position, and performs all of the diagnostics and self checks on the actuator.
9
10
Group 28 |
Troubleshooting |
Troubleshooting
Engine ECU, Fault Tracing
The “Premium Tech Tool” (PTT) is the preferred tool for performing diagnostic work. Contact your local dealer for more information or visit “www.premiumtechtool.com”.
The control units on the information link communicate according to the SAE J1587 standard. The standard has been extended with Volvo’s own supplement (PPID, PSID). The fault codes set by the control units contain information that is described by the following abbreviations.
MID |
Message Identification Description: |
SID |
Subsystem Identification Description: |
|
Identification of a control unit. |
|
Identification of a component. |
PID |
Parameter Identification Description: |
PSID |
Proprietary Subsystem Identification |
|
Identification of a parameter (value). |
|
Description Volvo: |
PPID |
Proprietary Parameter Identification |
|
Unique identification of a component. |
FMI |
|
||
|
Description Volvo: |
Failure Mode Identifier: |
|
|
Unique identification of a parameter |
|
Identification of fault types. |
|
(value). |
|
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FMI Table
FMI |
Display Text |
SAE Text |
|
|
|
0 |
Value to high |
Data valid, but above the normal working range |
|
|
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1 |
Value too low |
Data valid, but below the normal working range |
|
|
|
2 |
Incorrect data |
Intermittent or incorrect data |
|
|
|
3 |
Electrical fault |
Abnormally high voltage or short circuit to higher voltage |
|
|
|
4 |
Electrical fault |
Abnormally low voltage or short circuit to lower voltage |
|
|
|
5 |
Electrical fault |
Abnormally low current or open circuit |
|
|
|
6 |
Electrical fault |
Abnormally high current or short circuit to ground |
|
|
|
7 |
Mechanical fault |
Incorrect response from a mechanical system |
|
|
|
8 |
Mechanical or electrical fault |
Abnormal frequency |
|
|
|
9 |
Communication fault |
Abnormal update rate |
|
|
|
10 |
Mechanical or electrical fault |
Abnormally strong vibrations |
|
|
|
11 |
Unknown fault |
Non-identifiable fault |
|
|
|
12 |
Component fault |
Faulty unit or component |
|
|
|
13 |
Incorrect calibration |
Calibration values outside limits |
|
|
|
14 |
Unknown fault |
Special instructions |
|
|
|
15 |
Unknown fault |
Reserved for future use |
|
|
|
11
Group 28 |
Troubleshooting |
Engine ECU, Fault Tracing
PID
“MID 128 PID 26 Fan Speed Percent” page 14 “MID 128 PID 45 Preheater Relay” page 14 “MID 128 PID 81 Particulate Filter” page 15 “MID 128 PID 84 Vehicle Speed” page 15
“MID 128 PID 85 Cruise Control Status” page 15 “MID 128 PID 91 Accelerator Pedal Position” page 16 “MID 128 PID 94 Fuel Delivery Pressure” page 16 “MID 128 PID 97 Water in Fuel Indicator” page 17 “MID 128 PID 98 Engine Oil Level” page 17
“MID 128 PID 100 Engine Oil Pressure” page 18 “MID 128 PID 102 Intake Manifold Pressure” page 19 “MID 128 PID 103 Turbo Speed” page 20
“MID 128 PID 105 Intake Manifold Temperature” page 21 “MID 128 PID 108 Atmospheric Pressure” page 22
“MID 128 PID 110 Coolant Temperature” page 23 “MID 128 PID 111 Coolant Level” page 24
“MID 128 PID 153 Crankcase Pressure” page 25 “MID 128 PID 171 Ambient Temperature” page 26 “MID 128 PID 173 Exhaust Temperature” page 26 “MID 128 PID 175 Engine Oil Temperature” page 27 “MID 128 PID 354 Relative Humidity” page 28
“MID 128 PID 411 EGR Exhaust Back Pressure” page 29 “MID 128 PID 412 EGR Temperature” page 30
PPID
“MID 128 PPID 35 EGR Mass Flow” page 31
“MID 128 PPID 89 Variable Geometry Turbocharger Smart Remote Actuator Temperature” page 31 “MID 128 PPID 122 Engine Compression Brake” page 32
“MID 128 PPID 270 NOx Sensor” page 33 “MID 128 PPID 326 Soot Level” page 34
“MID 128 PPID 272 Air Pressure Compensation” page 34
“MID 128 PPID 328 Aftertreatment Injection Shutoff Valve” page 35 “MID 128 PPID 329 Aftertreatment Fuel Injector” page 35
“MID 128 PPID 330 DRV” page 36 “MID 128 PPID 337 Ash Level” page 37
“MID 128 PPID 387 Temperature Sensor, Catalytic Converter” page 37 “MID 128 PPID 436 Exhaust Gas Temperature Sensor 3” page 38
“MID 128 PPID 437 Aftertreatment Injector Fuel Pressure Sensor” page 39
12
Group 28 |
Troubleshooting |
PSID
“MID 128 PSID 47 Particulate Trap Regeneration” page 40 “MID 128 PSID 98 Boost Air System” page 40
“MID 128 PSID 108 Aftertreatment Injection System” page 41 “MID 128 PSID 109 Engine Coolant Temperature Sensor” page 42
SID
“MID 128 SID 1/2/3/4/5/6 Unit Injector” page 43
“MID 128 SID 18 Drain Valve, Water Separator” page 44 “MID 128 SID 21 Engine Position Timing Sensor” page 45 “MID 128 SID 22 Engine Speed Sensor” page 46
“MID 128 SID 27 Variable Geometry Turbocharger” page 47 “MID 128 SID 33 Fan Control” page 48
“MID 128 SID 70 Preheater Element 1” page 48 “MID 128 SID 71 Preheater Element 2” page 49 “MID 128 SID 146 EGR Valve 1” page 49
“MID 128 SID 211 5 Volt DC Supply” page 50
“MID 128 SID 230 Idle Validation Switch 1” page 50 “MID 128 SID 232 5 Volt DC Supply to Sensor” page 51
13
Group 28 Troubleshooting
MID 128 PID 26 Fan Speed Percent
Type of |
FMI Description: |
Fault Condition: |
Possible |
Possible Cause: |
|||
fault: |
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|
|
Symptoms: |
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FMI 3 |
• Voltage above |
• |
Missing signal |
• |
Higher fuel |
• |
Cooling Fan Speed (CFS) sensor |
|
|||||||
|
normal or shorted |
|
from Fan Speed |
• |
consumption |
• |
failure |
|
to high |
• |
Sensor |
Will work as |
Faulty Cooling Fan Speed (CFS) |
||
|
|
Short Circuit +, |
|
on/off fan, |
|
sensor harness |
|
|
|
• |
Measuring line |
|
100%fan speed |
|
|
|
|
Short Circuit -, |
|
if cooling is |
|
|
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|
|
• |
Measuring line |
|
needed |
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Open Circuit, |
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• |
Measuring line |
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Open Circuit, |
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Ground line |
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MID 128 PID 45 Preheater Relay
Type of |
FMI Description: |
Fault Condition: |
Possible |
Possible Cause: |
||||
fault: |
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|
|
|
Symptoms: |
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FMI 3 |
• |
Voltage above |
• |
Short Circuit +, |
• |
Preheat relay not |
• |
Preheat relay solenoid shorted |
|
||||||||
|
|
normal or shorted |
|
Measuring line |
• |
activated |
|
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to high |
|
|
White smoke for |
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• |
cold start |
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Start problems in |
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cold climate |
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FMI 4 |
• |
Voltage below |
• |
Short Circuit -, |
• |
Induction air is |
• |
Faulty harness |
|
||||||||
|
|
normal or shorted |
|
Measuring line |
|
hot |
|
|
|
|
low |
|
|
• |
Preheat relay |
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is impossible to |
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turn off |
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FMI 5 |
• |
Current below |
• |
Open Circuit |
• |
Preheat relay not |
• |
Faulty Preheat relay |
|
||||||||
|
|
normal or open |
|
|
• |
activated |
• |
Faulty harness |
|
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circuit |
|
|
White smoke for |
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|
• |
cold start |
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Start problems in |
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cold climate |
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14
Group 28 Troubleshooting
MID 128 PID 81 Particulate Filter
Type of |
FMI Description: |
Fault Condition: |
Possible |
Possible Cause: |
||||
fault: |
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|
Symptoms: |
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FMI 0 |
• |
Data valid but |
• |
Moderately high |
• |
Engine derate |
• |
Particulate Trap Pressure (PTP) |
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above normal |
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pressure |
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Malfunction |
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Sensor failure |
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operational |
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indicator lamp |
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range-most severe |
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illuminated |
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level |
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FMI 2 |
• |
Data erratic, |
• |
Sensor is not |
• |
Malfunction |
• |
Particulate Trap Pressure (PTP) |
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intermittent or |
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rational |
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indicator lamp |
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Sensor failure |
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incorrect |
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illuminated |
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FMI 3 |
• |
Voltage above |
• |
Short to battery |
• |
Malfunction |
• |
Particulate Trap Pressure (PTP) |
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normal or shorted |
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on the metering |
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indicator lamp |
• |
Sensor failure |
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high |
• |
side |
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illuminated |
Faulty Particulate Trap Pressure |
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Open in the |
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• |
(PTP) Sensor connector |
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ground line |
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Faulty harness |
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FMI 5 |
• |
Current below |
• |
Open in 5 volt |
• |
Malfunction |
• |
Particulate Trap Pressure (PTP) |
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normal or open |
• |
supply line |
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indicator lamp |
• |
Sensor failure |
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Short to ground |
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illuminated |
Faulty harness |
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• |
in metering line |
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Open in metering |
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line |
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FMI 12 |
• |
Bad intelligent |
• |
Particulate Trap |
• |
Engine derate |
• |
Diesel Particulate Filter (DPF) is |
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device or |
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Pressure (PTP) |
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damaged, filled with soot or missing |
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component |
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Sensor signal |
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high or low but |
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still within range |
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MID 128 PID 84 Vehicle Speed
Type of |
FMI Description: |
Fault Condition: |
Possible |
Possible Cause: |
fault: |
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Symptoms: |
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FMI 9 |
• Abnormal update |
• Missing signal |
• Engine derate |
• J1708 vehicle speed message does |
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rate |
from VECU |
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not exist, (VECU error) |
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MID 128 PID 85 Cruise Control Status
Type of |
FMI Description: |
Fault Condition: |
Possible |
Possible Cause: |
fault: |
|
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Symptoms: |
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FMI 9 |
• Abnormal update |
• Missing (Cruise |
• Cruise Control |
• No clutch info to EMS (J1939) |
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rate |
Control) signal |
does not work |
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from VECU |
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15
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