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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 P0712 or P0713 >> 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 transmission 20-way harness connector.
  2. Ignition OFF, test the TCM side of the transmission 20-way harness connector for less than 5 ohms between the low reference circuit terminal M and ground.
    • If greater than the specified range, test the low reference circuit for a an open/high resistance. If the circuit tests normal, replace the TCM.
  3. Ignition ON, verify that the TFT sensor parameter is at -40°C (-40°F).
    • If greater than the specified range, test the TCM side of the 20-way harness connector signal circuit terminal L for a short to ground. If the circuit tests normal, replace the TCM.
    4. IMPORTANT: If the signal circuit of the TFT sensor is shorted to voltage the TFT sensor may be damaged.
  4. Install a 3-amp fused jumper wire between the signal circuit terminal L and the low reference circuit terminal M on the TCM side of the transmission 20-way harness connector. Verify the TFT sensor parameter is greater than 128°C (262°F).
    • If less than the specified range test the signal circuit of the TFT sensor for a short to voltage or an open/high resistance. If the circuit tests normal, replace the TCM.
  5. If all circuits test normal, test or replace the internal transmission wiring harness or the TFT sensor.
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