Intermittent fault

Fig 1: Identifying Ignition ON

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Fig 2: Identifying Connector(s) Reinstallation

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Remedy contact resistance and oxidation in the control module and automatic transmission connectors. See Contact resistance and oxidation

Check the cable between control module terminal #37 (#A37) and transmission connector (control module side) terminal #L (#A11). Check for an intermittent short-circuit to ground. See Short-circuit to ground, intermittent faults .

Check the cable between control module terminal #55 (#A55) and transmission connector (control module side) terminal #M (#A12). Check for an intermittent short-circuit to ground. See Short-circuit to ground, intermittent faults .

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 .

Fig 3: Identifying Breakout Box

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Fig 4: Identifying Ohms Display

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  Refer to Information