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Home >> Cadillac >> 2012 >> Escalade EXT >> Repair and Diagnosis >> External Pages >> Different car >> Section 1809 (Hybrid/EV Control System) >> Diagnostic Information and Procedures >> DTC P0C2B >> Circuit/System Testing
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Circuit/System Testing

WARNING: This page is about a different car, the 2011 GMC Yukon, 2011 Chevrolet Tahoe, and 2011 Cadillac Escalade. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the X1 harness connector at the K6 automatic transmission auxiliary fluid pump control module.
  2. Test for less than 5 Ω between the ground circuit terminal C and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Verify that a test lamp illuminates between the B+ circuit terminal A and ground.
    • If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
  4. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal E and ground.
    • If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance.
  5. Ignition ON, test for 4.8-5.2 volts between the signal circuit terminal D and ground.
    • If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K6 automatic transmission auxiliary fluid pump control module.
    • If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the T6 drive motor generator power inverter module.
  6. Ignition OFF. Disconnect the X1 harness connector at the K6 automatic transmission auxiliary fluid pump control module. Connect the J 38522  variable signal generator to the harness connector signal circuit terminal D and ground.
  7. Adjust the signal generator to 50 percent duty cycle @ 250 Hz and observe the Trans. Aux. Pump Actual parameter with the scan tool. The scan tool should display 100 percent.
    • If the reading is less than 100 percent, test the signal circuit for a short to voltage. If the circuit tests normal replace the T6 drive motor generator power inverter module.
  8. If the reading is 100 percent, replace the K6 automatic transmission auxiliary fluid pump control module.
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