Checking the Control Module

Checking The Control Module







- Ignition off.
- The breakout box connected.
- Connect the control module.
- 8-pin transmission connector disconnected.

Check the transmission control module (TCM) by measuring the resistance between terminals #3 and #4 on the breakout box. The resistance must be approximately 9 kilo Ohms.

NOTE: When removing the transmission connector, the control module may store diagnostic trouble codes (DTCs) for the gear-shift position sensor, the shift solenoids and the temperature sensor etc.

Try a new control module if the resistance is infinite.

Other information:
- To disconnect the transmission connectors, see Transmission connectors.
- To replace the control module, see Replacing the transmission control module (TCM).
- For information about signals, see Signal description. Transmission control module (TCM).

Was the resistance OK?

YES: Refer to Trouble Code Descriptions. Diagnostic Trouble Code Descriptions
NO: Continue with Next Procedure. Verification