Intermittent fault
Check the control module and transmission connectors for contact resistance and oxidation according to Contact resistance and oxidation
Check the wiring between control module terminal A52 and transmission connector terminal C (#A3). Check the wiring between control module terminal A70 (#B10) and transmission connector terminal D (#A4) for an intermittent open-circuit according to Open-circuit, intermittent faults .
HINT: With the ignition off, the transmission connector disconnected, and the breakout box connected, the resistance between terminals 3 and 4 should be approximately 3.5 Ω.
Remedy as necessary.
Other information:
- To connect the breakout box, see Connecting the breakout box .
- To connect the breakout box to the transmission connector, see Connecting the breakout box, GM automatic transmissions .
- For information about signals, see Signal specification .
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Refer to Information