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Home >> Cadillac >> 2018 >> Escalade Base, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 16 (Transfer Case - Mp 3010 (NP0)) >> Diagnostic Information And Procedures >> DTC C0392, P0642 Or P0643: Transfer Case Range Position Sensor Circuit/5V Reference >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2018 GMC Yukon XL, 2018 GMC Yukon, 2018 Chevrolet Tahoe, and 2018 Chevrolet Suburban. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the harness connector at the B227 gear position sensor, also known as the rotational position sensor.
  2. Ignition ON, engine OFF.
  3. Test for 4.8 - 5.2 V between the 5-Volt reference circuit, terminal B and a good ground, such as the ground terminal of the EL-49742  harness, black terminal.
    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.
    • Testing for steps 3 - 7 is performed on the B227 gear position sensor harness connector using the GY probes J-35616-2A.
    • If less than the specified range 
    1. Ignition OFF, disconnect the X1 harness connector at the K69 transfer case control module.
    2. Test for less than 10 Ω in the 5-Volt reference circuit end to end.
      • If 10 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 10 Ω
    3. Test for infinite resistance between 5-Volt reference circuit terminal B and a good ground.
      • If less than infinite resistance, repair the short to ground in the circuit.
      • If infinite resistance
    4. Test for greater than 10 Ω between the 5-Volt reference circuit terminal B and all other terminals of the B227 gear position sensor harness connector.
    • If greater than the specified range 
    1. Ignition OFF, disconnect the X1 harness connector at the K69 transfer case control module. Ignition ON, Engine OFF.
    2. Test for less than 1 V between the 5-Volt reference circuit terminal B and a good ground.
      • If 1 V or greater, repair the short to voltage in the circuit.
      • If less than 1 V
    3. Test for greater than 10 Ω between the 5-Volt reference circuit, terminal B and all other terminals of the B227 gear position sensor harness connector.
    • Go to next step: If within the specified range 
  4. 5-Volt reference circuit and K69 transfer case control module OK.
  5. Test for 4.8 - 5.2 V between the 5-Volt reference circuit, terminal B, and the low reference circuit, terminal A.
    • If less than the specified range 
    1. Ignition OFF, disconnect the X1 harness connector at the K69 transfer case control module.
    2. Test for less than 10 Ω in the low reference circuit end to end.
      • If 10 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 10 Ω
    3. Test for infinite resistance between low reference circuit and a good ground.
      • If less than infinite resistance, repair the short to ground in the circuit.
      • If infinite resistance
    4. Test for greater than 10 Ω between the low reference circuit, terminal A and all other terminals of the B227 gear position sensor harness connector.
    • If greater than the specified range 
    1. Ignition OFF, disconnect the X1 harness connector at the K69 transfer case control module. Ignition ON, Engine OFF.
    2. Test for less than 1 V between the switch signal circuit, terminal A and a good ground.
      • If 1 V or greater, repair the short to voltage in the circuit.
      • If less than 1 V
    3. Test for greater than 10 Ω between the switch signal circuit, terminal A and all other terminals of the B227 gear position sensor harness connector.
    • Go to next step: If within the specified range 
  6. Low reference circuit and K69 transfer case control module OK.
  7. Test for 4.8 - 5.2 V between the rotational position sensor circuit, terminal C and a good ground, such as the ground terminal of the EL-49742  harness, black terminal.
    • If less than the specified range 
    1. Ignition OFF, disconnect the X1 harness connector at the K69 transfer case control module.
    2. Test for less than 10 Ω in the rotational position sensor circuit end to end.
      • If 10 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 10 Ω
    3. Test for infinite resistance between rotational position sensor circuit terminal C and a good ground.
      • If less than infinite resistance, repair the short to ground in the circuit.
      • If infinite resistance
    4. Test for greater than 10 Ω between the rotational position sensor circuit terminal C and all other terminals of the B227 gear position sensor harness connector.
    • If greater than the specified range 
    1. Ignition OFF, disconnect the X1 harness connector at the K69 transfer case control module. Ignition ON, Engine OFF.
    2. Test for less than 1 V between the rotational position sensor circuit terminal C and a good ground.
      • If 1 V or greater, repair the short to voltage in the circuit.
      • If less than 1 V
    3. Test for greater than 10 Ω between the rotational position sensor circuit, terminal C and all other terminals of the B227 gear position sensor harness connector.
    • Go to next step: If within the specified range 
  8. Rotational position sensor circuit and K69 transfer case control module OK.
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