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Circuit/System Testing

NOTE:

If a carbon pile tester is available, refer to With Carbon Pile Tester section. Otherwise, refer to Without Carbon Pile Tester section.

With Carbon Pile Tester

  1. Vehicle ON.
  2. Verify DTC P1F59, P1F5A, P1F5B, P1F5D, or P1F5E is not set.
    • If the DTCs are not set 
  3. Verify that no K1 14 V Power Module or B18 Battery Current Sensor DTCs are set that would cause a charging system concern.
    • If no applicable DTCs are set 
  4. Vehicle OFF.
  5. Test for 12.4 V or greater at room temperature across the C1 Battery terminals.
    • If within the specified range 
  6. Connect a carbon pile tester to the C1 Battery.
  7. Vehicle ON, turn all accessories off. Observe the voltage reading on the tester. The voltage should read between 12.6 - 15.5 V.
  8. Adjust the carbon pile tester so that the Low - Voltage Battery Current parameter on the 14 V Power Module data list of the Engine Control Module is reading 125 amps.
  9. Verify the voltage reading remains between 12.6 - 15.5 V.
    • If not within the specified range 
    1. Disconnect the X2 harness connector at the 14 V power module, vehicle ON.
    2. Test for 3.0 - 5.5 V between the control circuit terminal X2-01 and ground.
      • If less than 3.0 V
      1. Vehicle OFF, disconnect the harness connectors at the K20 ECM.
      2. Test for less than 2 Ω in the control circuit end to end.
        • If greater than 2 Ω, repair the open/high resistance in the circuit.
        • If less than 2 Ω
      3. Replace the K20 ECM.
      • If within 3.0 - 5.5 V
    3. Replace the K1 14 V Power Module.
    • If within the specified range 
  10. All OK.

Without Carbon Pile Tester

  1. Vehicle ON.
  2. Verify DTC P1F59, P1F5A, P1F5B, P1F5D, or P1F5E is not set.
    • If the DTCs are not set 
  3. Verify that no K1 14 V Power Module or B18 Battery Current Sensor DTCs are set that would cause a charging system concern.
    • If no applicable DTCs are set 
  4. Vehicle OFF.
  5. Test for 12.4 V or greater at room temperature across the C1 Battery terminals.
    • If within the specified range 
  6. Vehicle ON.
  7. Verify the scan tool Engine Control Module Ignition 1 Signal parameter continually increases when controlling the Engine Control Module 14 V Power Module Setpoint from 10 - 80% with a scan tool. It may take up to 10 s for the battery voltage to stabilize between each setpoint change.
    • If the battery voltage does not continually increase 
    1. Disconnect the X2 harness connector at the 14 V power module, vehicle ON.
    2. Test for 3.0 - 5.5 V between the control circuit terminal X2-01 and ground.
      • If less than 3.0 V
      1. Vehicle OFF, disconnect the harness connectors at the K20 ECM.
      2. Test for less than 2 Ω in the control circuit end to end.
        • If greater than 2 Ω, repair the open/high resistance in the circuit.
        • If less than 2 Ω
      3. Replace the K20 ECM.
      • If within 3.0 - 5.5 V
    3. Replace the K1 14 V Power Module.
    • If the battery voltage continually increases 
  8. All OK.
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