TB22 - Check Transmission Control Module Switch Input From TCS

- Key "ON", engine "OFF".

- Breakout box installed, Powertrain Control Module (PCM) disconnected.

- Measure the voltage between the tan/white wire and the black/white wire while cycling the Transmission Control Switch (TCS) several times.

- Does the voltage cycle?

Yes -- Replace Transmission Control Switch Module (TCSM). Remove breakout box. Reconnect PCM. Rerun quick test. Quick Test Appendix (Detailed Testing Instructions)

No -- Check TCS circuit.