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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 2000 (Automatic Transmission - 4T45-E - DTC P0973 To DTC P2797) >> DTC P1810, P1816, or P1818 (Hybrid) >> Circuit/System Testing (Hybrid)

Circuit/System Testing (Hybrid)

WARNING: This page is about a different car, the 2009 Saturn Vue. 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 automatic transmission inline 20-way connector at the transmission.
  2. Install the J 44152  on the engine side of the AT inline 20-way connector.
  3. Ignition ON, 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. Test for B+ between each signal circuit terminals R, P, U and ground.
    • If less than the specified value, test the appropriate signal circuit for an open/high resistance. If the circuits test normal, replace the TCM.
  5. If all circuits test normal, test the automatic transmission internal wiring harness and the TFP switch.
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