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Home >> Isuzu >> 2007 >> i-290 LS, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 39 (Lighting Systems) >> Diagnostic Information and Procedures >> DTC C0277 or DTC C0890 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2007 Cadillac DTS. However, it is still accessible from the selected car via links, so may be relevant.

C0277 06, C0277 07, and C0890 03

  1. Ignition OFF, disconnect the harness connector at the brake pedal position sensor.
  2. Ignition OFF, verify that a test lamp illuminates between the low reference circuit terminal C and B+.
    • If the test lamp does not illuminate, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the body control module (BCM).
  3. Ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit terminal A and ground.
    • If less than the specified range, test the 5-volt reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.
    • If greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the BCM.
  4. Verify the scan tool BPP Sensor parameter is less than 2 counts.
    • If greater than 0.1 volt, test the BPPS low reference circuit for a short to voltage or an open/high resistance. If the circuit/connections test normal, replace the BCM.
  5. Install a 3A fused jumper wire between the signal circuit terminal B and the 5-volt reference circuit terminal A. Verify the scan tool BPP Sensor parameter is greater than 1000 counts.
    • If less than the specified range, test the signal circuit for short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.
  6. If all circuits test normal, test or replace the brake pedal position sensor.

C0277 09

  1. Replace the brake pedal position sensor.
  2. Perform the scan tool BPP Sensor Calibration procedure.
  3. Operate the vehicle within the Conditions for Running and Setting the DTC and verify the DTC does not reset.
    • If the DTC resets, replace the BCM.

C0277 4B

  1. Ignition ON, verify that no other brake pedal position sensor DTCs are set.
    • If other brake pedal sensor DTCs are set, diagnosis those DTCs first.
  2. Ignition ON, perform the scan tool BPP Sensor Calibration procedure. Refer to Brake Pedal Position Sensor Calibration .
  3. Observe the scan tool BPPS Status parameter. The reading should be Learned.
    • If not the specified value, replace the brake pedal position sensor. If the DTC resets, replace the BCM.
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