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

Other information:
- See Connecting the breakout box, GM automatic transmissions
- See Signal description. Connector 4T65 EV/EV-GT
- For information on signals on the transmission control module (TCM): Signal specification
- See Checking wiring and terminals. Permanent fault
Fig 3: Identifying Breakout Box
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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
Adapter 9511505 and breakout box 9511428 connected to the gearbox connector (transmission control module (TCM) side and transmission side).
Start the engine.
Check that the voltage between the gearbox housing and the gearbox connector terminal #U (#A18) is battery voltage.

Other information:
- See Connecting the breakout box, GM automatic transmissions
- See Signal description. Connector 4T65 EV/EV-GT
- For information on signals on the transmission control module (TCM): Signal specification
- See Checking wiring and terminals. Permanent fault
Fig 3: Identifying Breakout Box
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Was the voltage OK?

Fig 1: Engine Start Verification

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Fig 2: Identifying Connector(s) Disconnected

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Engine idling
Adapter 9511505 and breakout box 9511428 connected to the transmission connector (transmission control module (TCM) side).
Gearbox connector disconnected.
NOTE:
When the transmission connector is unplugged, the transmission control module (TCM) will generate diagnostic trouble codes (DTCs) for solenoids and the gear shift position sensor. These do not require fault tracing after completion of this fault tracing.

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

Other information:
- See Connecting the breakout box, GM automatic transmissions
- For information on signals on the transmission control module (TCM): Signal specification
Fig 3: Identifying Breakout Box
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Was the voltage OK?