Volvo MID 128 Service Manual
Service Manual
Trucks
D
Group 28
MID 128 Fault Code Guide
2007 Emissions
VN, VHD VERSION2, VT
PV776-20184635
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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 beforeperforming 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 VehicleSpeed ........................................................... 15
MID 128 PID 85 Cruise Control Status ................................................ 15
MID 128 PID 91 Accelerator PedalPosition ........................................ 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 VariableGeometry Turbocharger .............................. 47
MID 128 SID 33 Fan Control ................................................................ 48
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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
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2
Group 28 Design and Function
Group 28
Design and Function
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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
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•
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.
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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.
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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.
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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.
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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.
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9
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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:
Identification of a control unit.
PID Parameter Identification Description:
Identification of a parameter (value).
PPID Proprietary Parameter Identification
Description Volvo:
Unique identification of a parameter
(value).
FMI Table
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SID Subsystem Identification Description:
Identification of a component.
PSID Proprietary Subsystem Identification
Description Volvo:
Unique identification of a component.
FMI Failure Mode Identifier:
Identification of fault types.
FMI Display Text
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Value to high Data valid, but above the normal working range
Value too low Data valid, but below the normal working range
Incorrect data Intermittent or incorrect data
Electrical fault Abnormally high voltage or short circuit to higher voltage
Electrical fault Abnormally low voltage or short circuit to lower voltage
Electrical fault Abnormally low current or open circuit
Electrical fault Abnormally high current or short circuit to ground
Mechanical fault Incorrect response from a mechanical system
Mechanical or electrical fault Abnormal frequency
Communication fault Abnormal update rate
Mechanical or electrical fault Abnormally strong vibrations
Unknown fault Non-identifiable fault
Component fault Faulty unit or component
Incorrect calibration Calibration values outside limits
Unknown fault Special instructions
Unknown fault Reserved for future use
SAE Text
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
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“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
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13
Group 28 Troubleshooting
MID 128 PID 26 Fan Speed Percent
Type of
fault:
FMI 3
FMI Description:
Voltage above
•
normal or shorted
to high
Fault Condition:
Missing signal
•
from Fan Speed
Sensor
Short Circuit +,
•
Measuring line
Short Circuit -,
•
Measuring line
Open Circuit,
•
Measuring line
Open Circuit,
•
Ground line
MID 128 PID 45 Preheater Relay
Type of
fault:
FMI 3
FMI Description:
Voltage above
•
normal or shorted
to high
Fault Condition:
Short Circuit +,
•
Measuring line
Possible
Symptoms:
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Higher fuel
•
consumption
Will work as
•
on/off fan,
100%fan speed
if cooling is
needed
Possible
Symptoms:
Preheat relay not
•
activated
White smoke for
•
cold start
Start problems in
•
cold climate
Possible Cause:
Cooling Fan Speed (CFS) sensor
•
failure
Faulty Cooling Fan Speed (CFS)
•
sensor harness
Possible Cause:
Preheat relay solenoid shorted
•
FMI 4
FMI 5
Voltage below
•
normal or shorted
low
Current below
•
normal or open
circuit
Short Circuit -,
•
Measuring line
Open Circuit
•
Induction air is
•
hot
Preheat relay
•
is impossible to
turn off
Preheat relay not
•
activated
White smoke for
•
cold start
Start problems in
•
cold climate
Faulty harness
•
Faulty Preheat relay
•
Faulty harness
•
14
Group 28 Troubleshooting
MID 128 PID 81 Particulate Filter
Type of
fault:
FMI 0
FMI 2
FMI 3
FMI 5
FMI Description:
Data valid but
•
above normal
operational
range-most severe
level
Data erratic,
•
intermittent or
incorrect
Voltage above
•
normal or shorted
high
Current below
•
normal or open
Fault Condition:
Moderately high
•
pressure
Sensor is not
•
rational
Short to battery
•
on the metering
side
Open in the
•
ground line
Open in 5 volt
•
supply line
Short to ground
•
in metering line
Open in metering
•
line
Possible
Symptoms:
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Engine derate
•
Malfunction
•
indicator lamp
illuminated
Malfunction
•
indicator lamp
illuminated
Malfunction
•
indicator lamp
illuminated
Malfunction
•
indicator lamp
illuminated
Possible Cause:
Particulate Trap Pressure (PTP)
•
Sensor failure
Particulate Trap Pressure (PTP)
•
Sensor failure
Particulate Trap Pressure (PTP)
•
Sensor failure
Faulty Particulate Trap Pressure
•
(PTP) Sensor connector
Faulty harness
•
Particulate Trap Pressure (PTP)
•
Sensor failure
Faulty harness
•
FMI 12
Bad intelligent
•
device or
component
Particulate Trap
•
Pressure (PTP)
Sensor signal
high or low but
still within range
Engine derate
•
MID 128 PID 84 Vehicle Speed
Type of
fault:
FMI 9
FMI Description:
Abnormal update
•
rate
Fault Condition:
Missing signal
•
from VECU
Possible
Symptoms:
Engine derate
•
MID 128 PID 85 Cruise Control Status
Type of
fault:
FMI 9
FMI Description:
Abnormal update
•
rate
Fault Condition:
Missing (Cruise
•
Control) signal
from VECU
Possible
Symptoms:
Cruise Control
•
does not work
Diesel Particulate Filter (DPF) is
•
damaged, filled with soot or missing
Possible Cause:
J1708 vehicle speed message does
•
not exist, (VECU error)
Possible Cause:
No clutch info to EMS (J1939)
•
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