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Home >> Buick >> 2015 >> Regal GS, AWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 9 (Hybrid/EV Control System) >> Diagnostic Information and Procedures >> DTC P0A3F, P0A40, P0C52, P0C53, P0C5C, P0C5D, or P1B03: Drive Motor Position Sensor >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.
    NOTE:

    You must perform the Component Testing before proceeding with Circuit/System Testing.

  1. Ignition OFF, disconnect the X1 harness connector at the A15 Starter Generator.
  2. Ignition ON.
  3. Test for 1.7-3.2V between the signal circuit terminals listed below and ground:
    • Signal (S1) circuit terminal 1
    • Signal (S3) circuit terminal 5
    • Signal (S2) circuit terminal 6
    • Signal (S4) circuit terminal 2
    • If less than 1.7V 
    1. Vehicle OFF, disconnect the X1 harness connector at the K59 Starter Generator Control Module.
      2. NOTE:

      The following test must be performed at the K59 Starter Generator Control Module end of the wiring harness.

    2. Test for infinite resistance between the appropriate signal circuit and the ground circuit listed below:
      • Signal (S1) circuit terminal 10 and ground circuit terminal 2
      • Signal (S3) circuit terminal 11 and ground circuit terminal 2
      • Signal (S2) circuit terminal 8 and ground circuit terminal 1
      • Signal (S4) circuit terminal 9 and ground circuit terminal 1
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance
    3. Test for infinite resistance between the signal circuit and chassis ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance
    4. Test for less than 2Ω in the signal circuit end to end.
      • If 2Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2Ω, replace the K59 Starter Generator Control Module.
    • If greater than 3.2V 
    1. Ignition OFF, disconnect the X1 harness connector at the K59 Starter Generator Control Module, Ignition ON.
    2. Test for less than 1V between the signal circuit and ground.
      • If 1V or greater, repair the short to voltage on the circuit.
      • If less than 1V, replace the K59 Starter Generator Control Module.
    • If between 1.7-3.2V 
  4. Test for 6.5-8.5V between the reference circuit terminals listed below and ground:
    • Reference terminal 3
    • Reference terminal 4
    • If less than 6.5V 
    1. Ignition OFF, disconnect the X1 harness connector at the K59 Starter Generator Control Module.
      2. NOTE:

      The following test must be performed at the K59 Starter Generator Control Module end of the wiring harness.

    2. Test for infinite resistance between the reference circuit and the following ground paths:
      • Chassis ground
      • Ground circuit terminal 13
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance
    3. Test for less than 2Ω in the reference circuit end to end.
      • If 2Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2Ω, replace the K59 Starter Generator Control Module.
    • If greater than 8.5V 
    1. Ignition OFF, disconnect the X1 harness connector at the K59 Starter Generator Control Module, Ignition ON.
    2. Test for less than 1V DC between the reference circuit and ground.
      • If 1V or greater, repair the short to voltage on the circuit.
      • If less than 1V, replace the K59 Starter Generator Control Module.
    • If between 6.5-8.5V 
  5. Verify DTC P0A3F, P0A40, P0C52, P0C53, P0C5C, P0C5D, or P1B03 is not set.
    • If any of the DTCs are set 
    1. Program the K59 Starter Generator Control Module.
    2. Verify the DTC does not set.
      • If the DTC sets, replace the K59 Starter Generator Control Module.
      • If the DTC does not set
    3. All OK.
    • If none of the DTCs are set 
  6. All OK.
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