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Circuit/System Testing

WARNING: This page is about a different car, the 2012 GMC Yukon XL, 2012 GMC Yukon, 2012 Chevrolet Tahoe, and 2012 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
    NOTE:

    When test probing harness terminals, it is imperative to use the proper test probe from the most current version of the J 35616  Kit. Use of an improper test probe may deform the terminal, resulting in intermittent open conditions.

  1. Verify that the TRANS IGN1 fuse, underhood fuse block, is not open.
    • If the TRANS IGN1 fuse is open, test the Ignition 1 voltage circuit, front drive axle actuator harness X1 pin C, for a short to ground.
  2. Wheels blocked. Parking brake engaged. Transmission in Neutral.
  3. Ignition ON, engine OFF. Install a scan tool.
  4. Disconnect the X1 harness connector at the front drive axle actuator (FDAA).
  5. Using the GY probe J 35616-2A, test for B+ (+0.0/-1.0 V) between the Ignition 1 voltage circuit, FDAA X1 harness pin C, and a good ground.
    • If the voltage is less than the specified value, test the affected circuit for an open/high resistance or short to ground. If all circuits and connections test normal, test the TCCM for proper operation.
  6. Using the GY probe J 35616-2A, test for B+ (+0.0/-1.0 V) between the Ignition 1 voltage circuit, FDAA X1 harness pin C, and the ground circuit, FDAA X1 harness pin E.
    • If the voltage is less than the specified value, test the ground circuit for an open/high resistance or short to voltage. If all circuits and connections test normal, test the TCCM for proper operation.
  7. Using the GY probes J 35616-2A, test for B+ (+0.0/-1.0 V) between the Ignition 1 voltage circuit, FDAA X1 harness pin C and the axle switch signal circuit, FDAA X1 harness pin A.
    • If the voltage is less than the specified value, test the axle switch signal circuit for an open/high resistance, short to ground or short to voltage. If all circuits and connections test normal, test the TCCM for proper operation.
  8. Using the GY probes J 35616-2A, measure the voltage between the front axle actuator control circuit, FDAA X1 harness pin B and a good ground, while commanding the front axle actuator ON and OFF using the Front Axle Actuator function of the Special Functions feature of the scan tool. When commanded to ON the voltage should read 0.0 V. When commanded to OFF the voltage should read 3.5-6.0 V.
    • If the measured voltage is less than 3.5 V when commanded OFF, test the front axle actuator control circuit for an open/high resistance or short to ground. If all circuits and connections test normal, test the TCCM for proper operation.
    • If the measured voltage is greater than 6.0 V when commanded ON, test the front axle actuator control circuit for a short to voltage. If all circuits and connections test normal, test the TCCM for proper operation.
  9. Go to Front Drive Axle Actuator (FDAA) in Component Testing.
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