service vehicle message
Thread Starter
Instructor
Joined: Oct 2008
Posts: 240
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From: seymour 10-e-c
St. Jude Donor '10-'11-'12-'13-'14
service vehicle message
i have a 99 coupe, that has a service vehicle message
i have searched my manuals an can not find anything like that ,
anyone have any ideas
thanks
i have searched my manuals an can not find anything like that ,
anyone have any ideas
thanks
Last edited by gorghamak; Jul 16, 2011 at 07:45 PM. Reason: incorrect spelling
Melting Slicks
Joined: Jul 1999
Posts: 2,784
Likes: 1
From: Silicon Valley
Manual page 2-101
SERVICE VEHICLE SOON: If this message appears
on the DIC, there may be an electrical or another system
problem with your vehicle. Have your vehicle checked
by your dealer if this message keeps appearing.
SERVICE VEHICLE SOON: If this message appears
on the DIC, there may be an electrical or another system
problem with your vehicle. Have your vehicle checked
by your dealer if this message keeps appearing.
Tech Contributor
Joined: Dec 2003
Posts: 19,384
Likes: 87
From: Horncastle Lincolnshire, England
2023 C5 of the Year Finalist - Unmodified
Thread Starter
Instructor
Joined: Oct 2008
Posts: 240
Likes: 0
From: seymour 10-e-c
St. Jude Donor '10-'11-'12-'13-'14
Have you pulled the codes yet?????
Here ia a link to the procedure:
http://www.c5forum.com/ayc/dtcdic.php
Codes have the format
Annnn
where A is an alpha character and nnnn is a 4 digit numeric. The codes are assocuiated with the various electronics/sensors in the car like
BCM PCM TCS RFA LDCM etc. Each code is followed by an H or a C or an HC.
Post the codes here after you pull them up.
Here ia a link to the procedure:
http://www.c5forum.com/ayc/dtcdic.php
Codes have the format
Annnn
where A is an alpha character and nnnn is a 4 digit numeric. The codes are assocuiated with the various electronics/sensors in the car like
BCM PCM TCS RFA LDCM etc. Each code is followed by an H or a C or an HC.
Post the codes here after you pull them up.
thank you
Thread Starter
Instructor
Joined: Oct 2008
Posts: 240
Likes: 0
From: seymour 10-e-c
St. Jude Donor '10-'11-'12-'13-'14
codes
Have you pulled the codes yet?????
Here ia a link to the procedure:
http://www.c5forum.com/ayc/dtcdic.php
Codes have the format
Annnn
where A is an alpha character and nnnn is a 4 digit numeric. The codes are assocuiated with the various electronics/sensors in the car like
BCM PCM TCS RFA LDCM etc. Each code is followed by an H or a C or an HC.
Post the codes here after you pull them up.
Here ia a link to the procedure:
http://www.c5forum.com/ayc/dtcdic.php
Codes have the format
Annnn
where A is an alpha character and nnnn is a 4 digit numeric. The codes are assocuiated with the various electronics/sensors in the car like
BCM PCM TCS RFA LDCM etc. Each code is followed by an H or a C or an HC.
Post the codes here after you pull them up.
Team Owner
Joined: Nov 2002
Posts: 138,651
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From: Poor pathetic little excuse for a boy
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Posts: 255
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From: Modesto CA
Review the info in the link I posted above carefully. The system starts out in automatic mode and quickly scans and displays each sensor and any associated codes. Then it goes into manual mode. In manual mode you can move at our own speed through each sensor and take the time to write down each associated code. Print the procedure and keep a copy in the glove box until you remember the various key functions.... Took a while for my old brain to remember them.
....I know how to do this...The issue that I have is that I get the service car soon WITH OUT any codes recorded in the DIC
Tech Contributor
Joined: Dec 2003
Posts: 19,384
Likes: 87
From: Horncastle Lincolnshire, England
2023 C5 of the Year Finalist - Unmodified
Even if the codes here were H codes, TCS No Comm would bring on the service vehicle light. TCS No Comm can be the indication of a total EBCM failure. If the EBCM fails, the computer is unable to do a handshake and puts up the No Comm warning.
The P0650 is an engine code but the P1571 is ABS related. I assume if you have a no comm, the P1571 is a P1571H?
DTC C1277 or P1571
Circuit Description
The EBCM and the PCM simultaneously control the traction control. The PCM reduces the amount of torque supplied to the drive wheels by retarding spark timing and selectively turning off fuel injectors. The EBCM actively applies the brakes to the front wheels in order to reduce torque.
The EBCM sends a requested torque message via a pulse width modulated (PWM) signal to the PCM. The duty cycle of the signal is used to determine how much engine torque the EBCM is requesting the PCM to deliver. Normal values are between 10 and 90 percent duty cycle. The signal should be at 90 percent when traction control is not active and at lower values during traction control activations. The PCM supplies a pull up voltage of 5 volts that the EBCM switches to ground to create the signal.
The PCM sends a delivered torque message via a pulse width modulated (PWM) signal to the EBCM. The duty cycle of the signal is used to determine how much engine torque the PCM is delivering. Normal values are between 10 and 90 percent duty cycle. The signal should be at low values (around 10 percent) at idle and higher values under driving conditions. The EBCM supplies a pull up voltage of 12 volts that the PCM switches to ground to create the signal.
When certain PCM DTCs are set, the PCM will not be able to perform the torque reduction portion of traction control. A serial data message is sent to the EBCM indicating that traction control is not allowed.
Conditions for Running the DTC
The engine is running.
Conditions for Setting the DTC
C1277
The PCM diagnoses the requested torque signal circuit and sends a serial data message to the EBCM indicating a fault is present.
P1571
One of the following conditions exists:
The PCM detects that requested torque signal is out of the valid range.
The PCM does not receive the requested torque signal.
Action Taken When the DTC Sets
If equipped, the following actions occur:
The EBCM disables the TCS/VSES for the duration of the ignition cycle.
The PCM will store conditions which were present when the DTC set as Fail Records data only.
The Traction Control and Active Handling indicator turns ON.
The DIC displays the following messages:
Service Traction System
Service Active Handling
The ABS remains functional.
Conditions for Clearing the DTC
The condition for the DTC is no longer present (the DTC is not current) and you used the scan tool Clear DTC function.
The condition for the DTC is no longer present (the DTC is not current) and you used the On-Board Diagnostics Clear DTC function.
The EBCM automatically clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles.
The PCM automatically clears the history DTC when a current DTC is not detected in 40 consecutive warm-up cycles.
Diagnostic Aids
The following conditions can cause this concern:
An open in the requested torque circuit
An short to ground or voltage in the requested torque circuit
A wiring problem, terminal corrosion, or poor connection in the requested torque circuit
A communication frequency problem
A communication duty cycle problem
The PCM is not receiving information from the EBCM
Loose or corroded EBCM ground or PCM ground
A DTC P1571 may set along with several other PCM DTCs if the key is held in the CRANK position while the engine is running. The starter lockout function of the PCM is enabled several seconds after the engine is running and prevents the starter from engaging while the engine is running. This will cause a partial loss of power to some components and systems.
Test Description
The numbers below refer to the step numbers on the diagnostic table.
Clear the DTC in order to verify that the fault is present.
Measure the requested torque signal in order to determine if the signal has a valid duty cycle.
Measure the requested torque signal in order to determine if the signal has a valid frequency.
This vehicle is equipped with a PCM which uses an electrically erasable programmable read only memory (EEPROM). When replacing the PCM, the replacement PCM must be programmed.
The P0650 is an engine code but the P1571 is ABS related. I assume if you have a no comm, the P1571 is a P1571H?
DTC C1277 or P1571
Circuit Description
The EBCM and the PCM simultaneously control the traction control. The PCM reduces the amount of torque supplied to the drive wheels by retarding spark timing and selectively turning off fuel injectors. The EBCM actively applies the brakes to the front wheels in order to reduce torque.
The EBCM sends a requested torque message via a pulse width modulated (PWM) signal to the PCM. The duty cycle of the signal is used to determine how much engine torque the EBCM is requesting the PCM to deliver. Normal values are between 10 and 90 percent duty cycle. The signal should be at 90 percent when traction control is not active and at lower values during traction control activations. The PCM supplies a pull up voltage of 5 volts that the EBCM switches to ground to create the signal.
The PCM sends a delivered torque message via a pulse width modulated (PWM) signal to the EBCM. The duty cycle of the signal is used to determine how much engine torque the PCM is delivering. Normal values are between 10 and 90 percent duty cycle. The signal should be at low values (around 10 percent) at idle and higher values under driving conditions. The EBCM supplies a pull up voltage of 12 volts that the PCM switches to ground to create the signal.
When certain PCM DTCs are set, the PCM will not be able to perform the torque reduction portion of traction control. A serial data message is sent to the EBCM indicating that traction control is not allowed.
Conditions for Running the DTC
The engine is running.
Conditions for Setting the DTC
C1277
The PCM diagnoses the requested torque signal circuit and sends a serial data message to the EBCM indicating a fault is present.
P1571
One of the following conditions exists:
The PCM detects that requested torque signal is out of the valid range.
The PCM does not receive the requested torque signal.
Action Taken When the DTC Sets
If equipped, the following actions occur:
The EBCM disables the TCS/VSES for the duration of the ignition cycle.
The PCM will store conditions which were present when the DTC set as Fail Records data only.
The Traction Control and Active Handling indicator turns ON.
The DIC displays the following messages:
Service Traction System
Service Active Handling
The ABS remains functional.
Conditions for Clearing the DTC
The condition for the DTC is no longer present (the DTC is not current) and you used the scan tool Clear DTC function.
The condition for the DTC is no longer present (the DTC is not current) and you used the On-Board Diagnostics Clear DTC function.
The EBCM automatically clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles.
The PCM automatically clears the history DTC when a current DTC is not detected in 40 consecutive warm-up cycles.
Diagnostic Aids
The following conditions can cause this concern:
An open in the requested torque circuit
An short to ground or voltage in the requested torque circuit
A wiring problem, terminal corrosion, or poor connection in the requested torque circuit
A communication frequency problem
A communication duty cycle problem
The PCM is not receiving information from the EBCM
Loose or corroded EBCM ground or PCM ground
A DTC P1571 may set along with several other PCM DTCs if the key is held in the CRANK position while the engine is running. The starter lockout function of the PCM is enabled several seconds after the engine is running and prevents the starter from engaging while the engine is running. This will cause a partial loss of power to some components and systems.
Test Description
The numbers below refer to the step numbers on the diagnostic table.
Clear the DTC in order to verify that the fault is present.
Measure the requested torque signal in order to determine if the signal has a valid duty cycle.
Measure the requested torque signal in order to determine if the signal has a valid frequency.
This vehicle is equipped with a PCM which uses an electrically erasable programmable read only memory (EEPROM). When replacing the PCM, the replacement PCM must be programmed.
Last edited by DeeGee; Jul 18, 2011 at 01:47 PM.
Thread Starter
Instructor
Joined: Oct 2008
Posts: 240
Likes: 0
From: seymour 10-e-c
St. Jude Donor '10-'11-'12-'13-'14
Cruising
Joined: May 2010
Posts: 14
Likes: 0
Service Vehicle soon
I get the same message on my DIC have to hiy reset every time I start the car. My Mechanic found no codes Someone on the forum said it could be my battery. I guess I will live with it and hit reset every time. Mine is a 97 with 56,000 miles .
Tech Contributor
Joined: Dec 2003
Posts: 19,384
Likes: 87
From: Horncastle Lincolnshire, England
2023 C5 of the Year Finalist - Unmodified
Thread Starter
Instructor
Joined: Oct 2008
Posts: 240
Likes: 0
From: seymour 10-e-c
St. Jude Donor '10-'11-'12-'13-'14