Otc C0241 Pcm Indicated Requested - GMC chevrolet camaro 2000 Service Manual

5-196 Antilock Brake System Brakes
OTC C0241 PCM Indicated Requested Torque Malf
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Circuit Description Diagnostic Aids
Traction Control is simultaneously controlled by the
EBCM and the ECM. The EBCM sends a requested
torque message via a Pulse Width Modulated (PWM)
signal to the ECM requesting a desired engine
torque level for proper Traction Control system
operation. The PCM supplies the pull up voltage.
• It is very important that a thorough inspection of
the wiring and connectors be performed. Failure
Conditions for Setting the DTC
• If a defective requested torque signal is detected
by the PCM, a message is broadcasted back to
the EBCM via class 2.
• DTC C0241 can be set anytime when ignition
voltage is present and the EBCM detects the
first class 2 message of a defective requested
torque signal from the PCM.
Action Taken When the DTC Sets
• A malfunction DTC is stored.
• The TCS is disabled.
• The TRAC OFF indicator is turned on. The
ABS remains functional.
Conditions for Clearing the DTC
• Condition for DTC is no longer present and scan
tool clear DTC function is used.
• 100 ignition cycles have passed with no DTC(s)
detected.
to carefully and fully inspect wiring and connectors
may result in misdiagnosis, causing part
replacement with reappearance of the malfunction.
• If an intermittent malfunction exists, refer to
Checking Aftermarket Accessories in Wiring
Systems.
• Possible causes for DTC C0241 to set:
- Open in the circuit 463.
- Circuit 463 shorted to ground or voltage.
- Communication problem.
- Circuit 463 has a wiring problem,
terminal corrosion, or poor connections.
- PCM not receiving information from
the EBCM.
Test Description
The numbers below refer to step numbers on the
diagnostic table.
4. This step checks for the proper requested torque
value received at the PCM. This value is in
percent of torque.
5. This step checks for the proper requested torque
value sent from the EBCM. This value is in
newton meters of torque.
7. This step checks for the presence of a pull-up
voltage from the PCM.
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