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Home >> Chevrolet >> 2001 >> Camaro Base, 2D Convertible, Automatic >> Repair and Diagnosis >> Brakes >> Traction Control >> Anti-Lock Brake System With Traction Control System - BOSCH 5.3 >> Diagnostic Tests >> DTC C0241 Or DTC P1571: Pcm Indicated Requested Torque Malfunction >> Diagnosis

DTC C0241 Or DTC P1571: Pcm Indicated Requested Torque Malfunction: Diagnosis

  1. Perform DIAGNOSTIC SYSTEM CHECK  under DIAGNOSIS & TESTING. Go to next step.
  2. Check Powertrain Control Module (PCM) and EBCM grounds for damaged, loose or corroded connections. See GROUND DISTRIBUTION article in WIRING DIAGRAMS. If problem was found, repair as necessary. After repairs, go to step  13 . If problem was not found, go to next step.
  3. Install scan tool. Start engine. Using scan tool, observe TORQUE REQUEST SIGNAL parameter in POWERTRAIN CONTROL MODULE data list. If scan tool displays less than 100%, see INTERMITTENTS & POOR CONNECTIONS  under DIAGNOSIS & TESTING. If scan tool does not display less than 100%, go to next step.
  4. Turn ignition off. Disconnect EBCM harness connector. Install Universal Breakout Box (J 39700) using (J 39700-530) Cable Adapter to EBCM harness connector and EBCM connector. Start engine. Measure DC duty cycle between universal pinout box terminal No. 27 (Orange wire) and ground. If duty cycle is 5-95 percent, go to next step. If duty cycle is not 5-95 percent, go to step  6 .
  5. Measure DC Hz between universal pinout box terminal No. 27 (Orange wire) and ground. If frequency is 121-134 hertz, go to step  8 . If frequency is not 121-134, go to next step.
    6. NOTE: Disconnecting EBCM connector and turning ignition on could cause other modules to set loss of communication DTCs (Uxxxx). Once EBCM is reconnected, EBCM may set DTC C0241.
  6. Turn ignition off. Disconnect cable adapter from EBCM. Turn ignition on, engine off. Measure voltage between universal pinout box terminal No. 27 (Orange wire) and ground. If voltage is 4-6 volts, go to step  10 . If voltage is not 4-6 volts, go to next step.
  7. Turn ignition off. Disconnect PCM connector. Check Orange wire between EBCM and PCM for short to voltage or short to ground. If problem was found, repair as necessary. After repairs, go to step  13 . If problem was not found, go to step 10 .
  8. Turn ignition off. Disconnect PCM harness connector. Check Orange wire between EBCM and PCM for open or high resistance. If problem was found, repair as necessary. After repairs, go to step  13 . If problem was not found, go to next step.
  9. Check PCM connector for poor connections. If problem was found, repair as necessary. After repairs, go to step  13 . If problem was not found, go to step  11 .
  10. Check EBCM connector for poor connections. If problem is found, repair as necessary. If problem is not found, go to step  12 .
  11. Replace PCM. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE. After repairs, go to step  13 .
  12. Replace EBCM. See ELECTRONIC BRAKE CONTROL MODULE  under REMOVAL & INSTALLATION. After repairs, go to next step.
  13. Using scan tool, clear DTCs. Operate vehicle. If DTC does not reset, system is okay.
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