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Home >> Chevrolet >> 2011 >> Impala LS, 3.9 M >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 21 (Automatic Transmission - 4T65-E - DTC PO218 Through DTC P2534) >> DTC P0562 or P0563 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.
    IMPORTANT: You must perform the Circuit/System Verification before proceeding with Circuit/System Testing.
  1. Engine OFF, disconnect the TCM connector. Connect the negative probe of the DMM to a good ground.
    2. IMPORTANT: When test probing TCM harness terminals, it is imperative to use the proper test probe from the most current version of the J 35616 GM terminal test kit. Use of the brown J 35616-6 (1.00 mm) PCM probe in a 0.64 mm terminal will deform the terminal, resulting in intermittent open conditions. The correct probe for TCM harnesses is the light blue 0.64 mm J 35616-64B probe.
  2. Ignition ON, engine OFF. Using the light blue 0.64 mm J 35616-64B probe, test for 11.0-14.5 V between the voltage circuit terminals listed below and the good ground.
    • Battery positive voltage, TCM connector Terminal 32
    • Ignition 1 voltage, TCM connector Terminal 31
    • If 0 V, inspect the Powertrain Control Module ETC fuse, fuse 9, and the Powertrain Control Module Ignition fuse, fuse 14, located in the Underhood Fuse Block, for being open. If open, test the affected circuit for a short to ground.
    • If the fuse is not open, test the affected circuit for an open.
  3. Compare the battery positive voltage value to the ignition 1 voltage value from step 3 above. The voltage drop between the circuits should be less than 0.2 volt.
    • If the voltage drop is greater than 0.2 volt, repair the open or high resistance in the affected circuit.
  4. If all circuits and connections test normal, replace the TCM.
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