Information on diagnosing ABS/TCS problems
Information on diagnosing ABS/TCS problems The ABS and Airbag Blues Thread
NOTICE!
I have decided to attach PDF's to help you guys diagnose your ABS and Airbag related problems.
I had to change the file extension to get them to upload due to their size.
YOU MUST change the file extension back in order to read them.
Thank you.
If you PM me I will try to assist you time allowing...
[I am revamping this thread. If it looks messy just wait.
]
1993 to 1997 F Body ABS Diagram
http://shbox.com/1/ABS_schematic.jpg
All rights reserved by shbox.com.
Save this document to your harddrive before they remove it.
1997 to 2002 F Body ABS PDF
https://ls1tech.com/forums/attachmen...1&d=1212385403
You must change the file extension back to .pdf from .efi. I had to do this to upload the file due to size.
Airbag Diagnostic PDF
https://ls1tech.com/forums/attachmen...1&d=1192338016
You must change the file extension back to .pdf from .efi. I had to do this to upload the file due to size.
Things to consider when working on your ABS
Figure 1: A typical 4 Channel ABS module pulled from a 2001 Camaro. The 4 channel module is a slightly different shape than the 3 channel module, however, it is easier to identify which ABS module you have my simply checking the rearward face for two brake lines. Both modules are very similar in shape and pin-out.
Figure 2: The rearward face of the ABS module.
Figure 3: The module from the bottom.
Great, Now You Have A Correct Replacement. Want To Take A Look Inside?
40-pin Brake Module Pin-Out (F-body 5.7L w/ASR)
Overview of ABS/TCS (F-body 5.7L w/ASR)
Where to find the Class 2 Data line connector
This is located under the dash. You have to remove the knee bolster. It is on the right most side.
ABS Trouble Codes
Even though our ABS module works off the same Vehicle Serial Interface (VSI-C2) as the PCM, only engine codes can be pulled by most scan tools on my market. You will need a special instrument like a Tech2 or a special tuning package like EFILive to pull codes from the other modules onboard IE the airbag mod, IP cluster, ABS mod. Without a code you are totally shooting in the dark.
U Codes
U codes are network codes pertaining to the J1850 GM (Class 2) serial network. This means the device is not responding to network broadcasts or the device is expecting a broadcast from another option/module not installed in the vehicle. This would happen if you installed a module in your car and the donor car had options your car doesn't. The module will freak out when it can't find the ONSTAR module which isn't on your car. All of your modules have learned the identity of each other and check up on each other every 2 seconds.
U codes are the hardest to diagnose and the most frusterating, but, this piece of information will help you greatly: A module with a stored U code is not the problem. That is one of the modules that is waiting for data packages it thinks should have been broadcasted.
Try relearning all the modules with a Tech2 or try a replacing the module in question. If neither of these solves the problem head directly to the splice pack connector/star pack connector. Check to make sure the data line is held to ground or power. Try removing the devices one by one through the splice pack connector.
C Codes
C codes are general trouble codes and usually fixed by replacing user servicable parts, reconfiging the module with a Tech2, or fixing a broken wire.
CXXXX Chassis Codes **Not all apply to F-bodies
C0035 Left Front Wheel Speed Circuit Malfunction
C0036 Left Front Wheel Speed Circuit Range/Performance
C0040 Right Front Wheel Speed Circuit Malfunction
C0041 Right Front Wheel Speed Circuit Range/Performance
C0045 Left Rear Wheel Speed Circuit Malfunction
C0046 Left Rear Wheel Speed Circuit Range/Performance
C0050 Right Rear Wheel Speed Circuit Malfunction
C0051 Right Rear Wheel Speed Circuit Range/Performance
C0060 Left Front ABS Solenoid No. 1 Circuit Malfunction
C0065 Left Front ABS Solenoid No. 2 Circuit Malfunction
C0070 Right Front ABS Solenoid No. 1 Circuit Malfunction
C0075 Right Front ABS Solenoid No. 2 Circuit Malfunction
C0080 Left Rear ABS Solenoid No. 1 Circuit Malfunction
C0085 Left Rear ABS Solenoid No. 2 Circuit Malfunction
C0090 Right Rear ABS Solenoid No. 1 Circuit Malfunction
C0095 Right Rear ABS Solenoid No. 2 Circuit Malfunction
C0100 Rear ABS Solenoid No. 1 Circuit Malfunction
C0105 Rear ABS Solenoid No. 2 Circuit Malfunction
C0110 Pump Motor Circuit Malfunction
C0121 Valve Relay Circuit Malfunction
C0131 ABS/TCS System Pressure Circuit Malfunction
C0132 ABS/TCS System Pressure Circuit Range/Performance
C0141 Left TCS Solenoid No. 1 Circuit Malfunction
C0146 Left TCS Solenoid No. 2 Circuit Malfunction
C0151 Right TCS Solenoid No. 1 Circuit Malfunction
C0156 Right TCS Solenoid No. 2 Circuit Malfunction
C0161 ABS/TCS Brake Switch Circuit Malfunction
C0166 TCS Priming Line Valve Circuit Malfunction
C0171 TCS Pilot Valve Circuit Malfunction
C0181 Throttle Reduction Motor Circuit Malfunction
C0182 Throttle Reduction Motor Circuit Range/Performance
C0186 Lateral Accelerometer Circuit Malfunction
C0187 Lateral Accelerometer Circuit Range/Performance
C0196 Yaw Rate Circuit Malfunction **Not F-body**
C0197 Yaw Rate Circuit Range/Performance **Not F-body**
C0235 TCS RPM Signal Circuit Malfunction
C0236 TCS RPM Signal Circuit Malfunction
C0237 TCS RPM Signal Circuit Malfunction
C0238 TCS Throttle Position Sensor Comparison Malfunction
C0239 TCS Spark Retard Monitoring Malfunction
C0240 PCM Traction Control Not Allowed
C0241 PCM Indicated Requested Torque Malfunction
C0244 PWM Delivered Torque Malfunction
C0245 Wheel Speed Sensor Frequency Error
C0252 Active Brake Control Sensors Uncorrelated
C0253 Centering Fault
C0266 ADS Controller Malfunction
C0550 ECU Malfunction
C0710 Steering Position Signal Malfunction **Not F-body**
C0870 BPMV Pressure Sensor Reference Circuit Malfunction
C0875 Yaw/Lateral Accelerometer Sensor Circuit Malfunction **Not F-body**
C0896 Device Voltage Range/Performance
C0901 Device No. 2 Voltage Low
PXXXX Powertrain Codes
P1504 TCS RPM Signal Circuit Malfunction
P1571 PCM Indicated Requested Torque Malfunction
P1689 PWM Delivered Torque Malfunction
UXXXX Network Codes
U1000 Class 2 Data Link
U1016 Lost Class 2 Communications With Engine Controller
U1040 Lost Communications with Brake/TCS Controller
U1096 Lost Communications W/Driver Information and Displays Controller
U1650 Chassis System Dedicated Bus Controller Malfunction
U1651 Chassis System Dedicated Bus Sensor Malfunction
External Links To Visit:
Understanding GM Serial Communication and U /codes:
http://www.gmtcny.com/serial%20data.html
SAE Specs over the Class 2 Serial Protocol:
http://www.interfacebus.com/Automoti...J1850_Bus.html
Specs on the CAN Bus:
http://www.interfacebus.com/Design_Connector_CAN.html
RS232 Specs:
http://www.interfacebus.com/Design_Connector_RS232.html
NOTICE!
I have decided to attach PDF's to help you guys diagnose your ABS and Airbag related problems.
I had to change the file extension to get them to upload due to their size.
YOU MUST change the file extension back in order to read them.
Thank you.
If you PM me I will try to assist you time allowing...
[I am revamping this thread. If it looks messy just wait.
]1993 to 1997 F Body ABS Diagram
http://shbox.com/1/ABS_schematic.jpg
All rights reserved by shbox.com.
Save this document to your harddrive before they remove it.
1997 to 2002 F Body ABS PDF
https://ls1tech.com/forums/attachmen...1&d=1212385403
You must change the file extension back to .pdf from .efi. I had to do this to upload the file due to size.
Airbag Diagnostic PDF
https://ls1tech.com/forums/attachmen...1&d=1192338016
You must change the file extension back to .pdf from .efi. I had to do this to upload the file due to size.
Things to consider when working on your ABS
- Rubber isolators can't be purchased at the dealer or anywhere else.
- Frame rail mounting bracket can't be purchased at the dealer.
- Get replacement parts from the vehicle as closest to yours as possible.
- Driving with a broken ABS system is very dangerous. Just unplug it completely until it is fixed. The car will behave like a car without ABS.
GM Part numbers and approx cost
ABS Module * ~469.00
Front Wh Sensor/Hub, 98-02 7470587 ~$230.00
Rr Wh Sensor, 98-02, LS1, NW9 10456535 ~$
IdentificationABS Module * ~469.00
Front Wh Sensor/Hub, 98-02 7470587 ~$230.00
Rr Wh Sensor, 98-02, LS1, NW9 10456535 ~$
Figure 1: A typical 4 Channel ABS module pulled from a 2001 Camaro. The 4 channel module is a slightly different shape than the 3 channel module, however, it is easier to identify which ABS module you have my simply checking the rearward face for two brake lines. Both modules are very similar in shape and pin-out.
Figure 2: The rearward face of the ABS module.
Figure 3: The module from the bottom.
Great, Now You Have A Correct Replacement. Want To Take A Look Inside?
40-pin Brake Module Pin-Out (F-body 5.7L w/ASR)
Overview of ABS/TCS (F-body 5.7L w/ASR)
Where to find the Class 2 Data line connector
This is located under the dash. You have to remove the knee bolster. It is on the right most side.
ABS Trouble Codes
Even though our ABS module works off the same Vehicle Serial Interface (VSI-C2) as the PCM, only engine codes can be pulled by most scan tools on my market. You will need a special instrument like a Tech2 or a special tuning package like EFILive to pull codes from the other modules onboard IE the airbag mod, IP cluster, ABS mod. Without a code you are totally shooting in the dark.
U Codes
U codes are network codes pertaining to the J1850 GM (Class 2) serial network. This means the device is not responding to network broadcasts or the device is expecting a broadcast from another option/module not installed in the vehicle. This would happen if you installed a module in your car and the donor car had options your car doesn't. The module will freak out when it can't find the ONSTAR module which isn't on your car. All of your modules have learned the identity of each other and check up on each other every 2 seconds.
U codes are the hardest to diagnose and the most frusterating, but, this piece of information will help you greatly: A module with a stored U code is not the problem. That is one of the modules that is waiting for data packages it thinks should have been broadcasted.
Try relearning all the modules with a Tech2 or try a replacing the module in question. If neither of these solves the problem head directly to the splice pack connector/star pack connector. Check to make sure the data line is held to ground or power. Try removing the devices one by one through the splice pack connector.
C Codes
C codes are general trouble codes and usually fixed by replacing user servicable parts, reconfiging the module with a Tech2, or fixing a broken wire.
CXXXX Chassis Codes **Not all apply to F-bodies
C0035 Left Front Wheel Speed Circuit Malfunction
C0036 Left Front Wheel Speed Circuit Range/Performance
C0040 Right Front Wheel Speed Circuit Malfunction
C0041 Right Front Wheel Speed Circuit Range/Performance
C0045 Left Rear Wheel Speed Circuit Malfunction
C0046 Left Rear Wheel Speed Circuit Range/Performance
C0050 Right Rear Wheel Speed Circuit Malfunction
C0051 Right Rear Wheel Speed Circuit Range/Performance
C0060 Left Front ABS Solenoid No. 1 Circuit Malfunction
C0065 Left Front ABS Solenoid No. 2 Circuit Malfunction
C0070 Right Front ABS Solenoid No. 1 Circuit Malfunction
C0075 Right Front ABS Solenoid No. 2 Circuit Malfunction
C0080 Left Rear ABS Solenoid No. 1 Circuit Malfunction
C0085 Left Rear ABS Solenoid No. 2 Circuit Malfunction
C0090 Right Rear ABS Solenoid No. 1 Circuit Malfunction
C0095 Right Rear ABS Solenoid No. 2 Circuit Malfunction
C0100 Rear ABS Solenoid No. 1 Circuit Malfunction
C0105 Rear ABS Solenoid No. 2 Circuit Malfunction
C0110 Pump Motor Circuit Malfunction
C0121 Valve Relay Circuit Malfunction
C0131 ABS/TCS System Pressure Circuit Malfunction
C0132 ABS/TCS System Pressure Circuit Range/Performance
C0141 Left TCS Solenoid No. 1 Circuit Malfunction
C0146 Left TCS Solenoid No. 2 Circuit Malfunction
C0151 Right TCS Solenoid No. 1 Circuit Malfunction
C0156 Right TCS Solenoid No. 2 Circuit Malfunction
C0161 ABS/TCS Brake Switch Circuit Malfunction
C0166 TCS Priming Line Valve Circuit Malfunction
C0171 TCS Pilot Valve Circuit Malfunction
C0181 Throttle Reduction Motor Circuit Malfunction
C0182 Throttle Reduction Motor Circuit Range/Performance
C0186 Lateral Accelerometer Circuit Malfunction
C0187 Lateral Accelerometer Circuit Range/Performance
C0196 Yaw Rate Circuit Malfunction **Not F-body**
C0197 Yaw Rate Circuit Range/Performance **Not F-body**
C0235 TCS RPM Signal Circuit Malfunction
C0236 TCS RPM Signal Circuit Malfunction
C0237 TCS RPM Signal Circuit Malfunction
C0238 TCS Throttle Position Sensor Comparison Malfunction
C0239 TCS Spark Retard Monitoring Malfunction
C0240 PCM Traction Control Not Allowed
C0241 PCM Indicated Requested Torque Malfunction
C0244 PWM Delivered Torque Malfunction
C0245 Wheel Speed Sensor Frequency Error
C0252 Active Brake Control Sensors Uncorrelated
C0253 Centering Fault
C0266 ADS Controller Malfunction
C0550 ECU Malfunction
C0710 Steering Position Signal Malfunction **Not F-body**
C0870 BPMV Pressure Sensor Reference Circuit Malfunction
C0875 Yaw/Lateral Accelerometer Sensor Circuit Malfunction **Not F-body**
C0896 Device Voltage Range/Performance
C0901 Device No. 2 Voltage Low
PXXXX Powertrain Codes
P1504 TCS RPM Signal Circuit Malfunction
P1571 PCM Indicated Requested Torque Malfunction
P1689 PWM Delivered Torque Malfunction
UXXXX Network Codes
U1000 Class 2 Data Link
U1016 Lost Class 2 Communications With Engine Controller
U1040 Lost Communications with Brake/TCS Controller
U1096 Lost Communications W/Driver Information and Displays Controller
U1650 Chassis System Dedicated Bus Controller Malfunction
U1651 Chassis System Dedicated Bus Sensor Malfunction
External Links To Visit:
Understanding GM Serial Communication and U /codes:
http://www.gmtcny.com/serial%20data.html
SAE Specs over the Class 2 Serial Protocol:
http://www.interfacebus.com/Automoti...J1850_Bus.html
Specs on the CAN Bus:
http://www.interfacebus.com/Design_Connector_CAN.html
RS232 Specs:
http://www.interfacebus.com/Design_Connector_RS232.html
Last edited by 2002_Z28_Six_Speed; May 17, 2009 at 03:42 PM.
