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Home >> Buick >> 2007 >> Allure CX >> Repair and Diagnosis >> External Pages >> Different car >> Section 67 (Automatic Transaxle - 4T65-E - DTC P0218 To DTC P2534) >> DTC P0851 or P0852 (3.6L and 5.3L) >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2008 Buick LaCrosse and 2008 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, transmission in PARK, disconnect the automatic transmission 20-way inline connector.
  2. With the ignition ON, engine OFF, using a DMM and the J 35616  GM terminal test kit, measure the voltage between the park/neutral signal circuit, terminal W, on the engine side of the 20-way connector and chassis ground. The voltage should be 11.8-12.2 volts.
    • If the voltage is less than the specified range, test the park/neutral signal circuit for an open, high resistance or short to ground. If the circuit tests normal, replace the ECM.
    • If the voltage is greater than the specified range, test the park/neutral signal circuit for a short to voltage. If the circuit tests normal, replace the ECM.
  3. Using the J 35616  GM terminal test kit, measure the resistance between the ground circuit, terminal K, on the engine side of the automatic transmission 20-way inline connector and chassis ground. The resistance should be less than 10 ohms.
    • If the resistance is greater than the specified value, repair the open or high resistance in the ground circuit.
  4. 4. Ignition OFF, install the J 44152  jumper harness (20 pins) on the transmission side of the automatic transmission 20-way inline connector. See Special Tools . Using the J 35616  GM terminal test kit, measure the resistance between the park/neutral position signal circuit, pin W, and the ground circuit, pin K. The resistance should be less than 10 ohms. Repeat with transmission in NEUTRAL.
    • If the resistance is greater than the specified range, test the park/neutral signal circuit and the ground circuit for an open or high resistance. If an open or high resistance condition is found, replace the transmission wiring harness. If the circuits test normal, replace the IMS.
  5. Using the J 35616  GM terminal test kit, measure the resistance between the park/neutral signal circuit, pin W, and the transmission case. The resistance should be greater than 10K ohms.
    • If the resistance is less than 10K ohms, test the park/neutral signal circuit for a short to the transmission case. If a short to the case is found, replace the transmission wiring harness. If the circuits test normal, replace the IMS.
  6. With the transmission IN GEAR, using the J 35616  GM terminal test kit, measure the resistance between the park/neutral signal circuit and all other circuits of the J 44152  jumper harness (20 pins) including the ground circuit, pin K. See Special Tools . The resistance should be greater than 10K ohms.
    • If the resistance is less than 10K ohms, replace the transmission wiring harness. If the circuits test normal, replace the IMS.
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