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Home >> Pontiac >> 2009 >> Vibe Base, 2.4 0, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 70 (Automatic Transmission - 4T80-E - DTC P0218 To DTC P2534) >> DTC P0851 or P0852 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2009 Cadillac DTS. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the X101 harness connector at the transmission.
  2. Test for less than 5.0 ohms between the ground circuit terminal K and ground.
    • If greater than the specified value, test the ground circuit for an open/high resistance.
  3. Ignition ON, verify with a scan tool the park/neutral switch parameter displays, in gear.
    • If not the specified value, test the signal circuit, terminal W for a short to ground. If the circuits test normal replace the control module.
  4. Install a 3 A fused jumper wire between the signal circuit terminal W and the ground circuit terminal K. Verify the scan tool park/neutral switch parameter displays, park/neutral.
    • If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the powertrain control module (PCM).
  5. Inspect the transmission internal wire harness circuits for opens, high resistance or shorts to grounds.
    • If a wire circuit condition is observed, replace the internal wire harness assembly.
  6. If all circuits test normal, test or replace the IMS.
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