Checking the component

Fig 1: Identifying Ignition OFF

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Fig 2: Identifying Connector(s) Disconnected

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Ignition off
Disconnect the transmission connector
Connect adapter 9511505 and breakout box 9511428 to the transmission connector (transmission side)
Disconnect the transmission connector (control module side).
Check that the resistance between the transmission housing and connector terminal #U (#A18) is 0-50 Ω.

Other information:
- 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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Was the resistance OK?

Fig 1: Engine Start Verification

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Fig 2: Identifying Connector(s) Reinstallation

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Ignition off
Connect adapter 9511505 and breakout box 9511428 to the transmission connector (transmission and control module side)
Start the engine.
Check that the voltage between the transmission housing and connector terminal #U (#A18) is battery voltage.

Other information:
- 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 Voltage Display
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Is the voltage OK?

Fig 1: Engine Start Verification

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Fig 2: Identifying Connector(s) Disconnected

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Engine idling
Connect adapter 9511505 and breakout box 9511428 to the transmission connector (control module side)
The transmission connector disconnected.
NOTE:
Diagnostic trouble codes (DTCs) for the gear-shift position sensor and the solenoids may be stored in the transmission control module (TCM) when disconnecting the transmission connector. These do not need to be fault traced when this fault tracing is complete.

Check that the voltage between any ground terminal and terminal #A18 (#U) is battery voltage.

Other information:
- 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 Voltage Display
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Was the voltage OK?