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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1658 (Antilock Brake System - Hybrid 3.6L (Hp5)) >> Diagnostic Information and Procedures >> DTC C0294, C120C, or C12F8 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2009 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the harness connector at the brake master cylinder piston position sensor.
  2. Ignition OFF, test for less than 5 ohm between the low reference circuit terminal 4 and ground.
    • If greater than the specified range, test the low reference circuit for an open/high resistance.
  3. Ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit terminal 2 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 greater than the specified range, test the 5-volt reference circuit for a short to voltage.
  4. Verify the scan tool BMC Primary Piston Position Sensor A parameter is less than 1 volt.
    • If greater than the specified range, test the signal circuit terminal 1 for a short to voltage.
  5. Install a 3A fused jumper wire between the signal circuit terminal 1 and the 5-volt reference circuit terminal 2. Verify the scan tool BMC Primary Piston Position Sensor A parameter is greater than 4.5 volts.
    • If less than the specified range, test the signal circuit for a short to ground or an open/high resistance.
  6. Verify the scan tool BMC Primary Piston Position Sensor B parameter is less than 1 volt.
    • If greater than the specified range, test the signal circuit terminal 3 for a short to voltage.
  7. Install a 3A fused jumper wire between the signal circuit terminal 3 and the 5-volt reference circuit terminal 2. Verify the scan tool BMC Primary Piston Position Sensor B parameter is greater than 4.5 volts.
    • If less than the specified range, test the signal circuit for a short to ground or an open/high resistance.
  8. If all circuits test normal, replace the brake master cylinder piston position sensor. If DTC resets, replace the EBCM.
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