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Circuit/System Testing

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  1. Ignition OFF, disconnect the X1 16-way harness connector at the T12 automatic transmission assembly.
  2. Ignition OFF, test for less than 5 ohms on the vehicle harness connector X1 terminal 5 and ground at the transmission case.
    • If greater than the specified value, test the ground circuit for an open/high resistance.
  3. Ignition ON, verify that a test lamp illuminates at connector X1 vehicle harness side and the following terminals:
    • Terminal 4 and ground at the transmission case
    • Terminal 12 and ground at the transmission case
    • If the test lamp does not illuminate on any circuit, test the ignition or B+ circuit for a short to ground or an open/high resistance.
  4. If all circuits test normal, replace the Q8 control solenoid valve assembly.
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