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Home >> Chevrolet >> 2012 >> Cruze Eco, Automatic Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 137 (Automatic Transmission - 4T45-E - DTC P0218 To DTC P2764) >> DTC P1810, P1816, or P1818 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2010 Pontiac G5 and 2010 Chevrolet Cobalt. However, it is still accessible from the selected car via links, so may be relevant.
    IMPORTANT: Additional DTCs may set when disconnecting the automatic transmission inline 20-way connector.
  1. Ignition OFF, disconnect the X100 automatic transmission inline 20-way connector at the transmission.
  2. Install the J 44152  on the harness side of the AT inline 20-way connector. See Special Tools .
  3. Ignition ON, engine OFF, observe the scan tool TFP Sw. Sig. B/ Sig. C parameter. The reading should display HI/HI.
    • If not the specified value, test the appropriate signal circuit for a short to ground. If the circuits test normal, replace the TCM.
  4. Install a 3 A fused jumper wire between the TFP B signal circuit terminal R and ground and TFP C signal circuit terminal P and ground. Verify the scan tool TFP Sw. Sig. B/ Sig. C parameters change from HI to LOW.
    • If not the specified value, test the appropriate signal circuit for an open/high resistance. If the circuits test normal, replace the TCM.
  5. Test the internal transmission wiring harness assembly TFP B signal circuit and TFP C signal circuit for a short to ground or an open/high resistance condition.
    • If the circuits test normal, replace the TFP switch assembly.
    • If a circuit is shorted or has an open/high resistance condition, replace the internal wiring harness.
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