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Home >> Pontiac >> 2008 >> Grand Prix Base >> Repair and Diagnosis >> Brakes >> Anti-Lock Brake System, Traction Control System & Stability Control System >> Diagnostic Information and Procedures >> DTC C0241 >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the EBCM connector C1 terminal 13 or 14.
  2. Test for less than 1.0 ohm of resistance between the ground circuit connector C1 terminal 16 and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Ignition ON, verify that a test lamp illuminates between the B+ circuit of the EBCM supply voltage terminal connector C1 terminal 13 or 14 and ground.
    • If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal and the B+ circuit fuse (ABS MTR 40-amp) or (ABS SOL 25-amp) or (ABS 10-amp) in the fuse block underhood BEC is open, test all components connected to the B+ circuit and replace as necessary.
  4. Engine ON, measure the DC Hz for 121-134 Hz between the PCM or ECM requested torque signal circuit connector C3 terminal 40(L26) or 17(LS4) and a good ground.
    • If the value is below the specified range, test the PCM or ECM requested torque signal circuit for an open/high resistance. If the circuit tests normal replace the PCM or ECM.
    • If the value is above the specified range, test the PCM or ECM requested torque signal circuit for an short to voltage. If the circuit tests normal replace the PCM/ECM.
  5. Connect a DMM between the requested torque signal circuit connector C3 terminal 40(L26) or 17(LS4) of the PCM or ECM and a good ground.
  6. Test the requested torque signal circuit for 4-6 volts.
    • If the voltage is below the specified range, test the requested torque circuit for a short to ground, or open/high resistance. If the circuit tests normal, replace the EBCM.
    • If the voltage is above the specified range, test the requested torque circuit for a short to voltage. If the circuit tests normal, replace EBCM.
  7. If all circuits test normal, replace the EBCM.
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