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Home >> Chevrolet >> 2006 >> Silverado 1500 HD, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1375 (Automatic Transmission - ALLISON - DTC P0218 To DTC P0878) >> DTC P0712 or P0713 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2009 GMC Sierra, 2009 GMC Cab & Chassis Sierra, 2009 Chevrolet Silverado, and 2009 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the X175 harness connector at the transmission.
  2. Ignition ON, engine OFF, connect a 3A fused jumper wire to the TFT signal circuit terminal pin G, to TFT low reference circuit terminal H. Verify with a scan tool that the Trans. Fluid Temp. parameter changes from -40°C (-40°F) to 160°C (320°F) when the jumper is installed.
    • If not the specified value, test the TFT reference voltage and ground circuits for a short to voltage, short to ground or an open/high resistance. If circuits test normal, replace the TCM.
  3. Remove the transmission oil pan. Refer to Oil Pan Replacement .
  4. Test the transmission internal TFT signal and low reference circuits for a short to voltage, short to ground or and open/high resistance.
    • If circuits test normal, test or replace the pressure switch manifold, with thermistor.
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