TB21 - Check Wiring of Transmission Control Switch Module
- Key "OFF".
- Breakout box installed, Powertrain Control Module (PCM) disconnected.
- Transmission Control Switch Module (TCSM).
- Measure the voltage supply to the TCSM between the red/light green (+) wire and the black white (-) wire.
- Is the voltage greater than 1O.5V?
Yes -- Go to TB22. TB22 - Check Transmission Control Module Switch Input From TCS
No -- Service open circuit or fuse from the TCSM connector to the ignition switch. Remove breakout box. Reconnect all components. Rerun self-test. Quick Test Appendix (Detailed Testing Instructions)