TCCS System: Testing: Diagnosis

Diagnose TCCS system in the following order:

1. Ensure that all engine systems NOT related to TCCS are fully operational. DO NOT  proceed with testing until all other problems have been fixed. Always check fuses, fusible links and wire connectors before condemning the ECU.
2. Enter diagnostic mode and record trouble codes. Exit diagnostic mode. If no trouble codes were displayed, go to DIAGNOSTIC CIRCUIT CHECK  charts. Follow instructions given there.
3. If no trouble codes were displayed after performing diagnostic circuit check, perform voltage and resistance checks. If trouble codes are displayed, perform tests to confirm cause of malfunction which set the corresponding trouble code.
4. After any repairs are made, clear trouble codes and perform diagnostic circuit check. Normal system operation code should be displayed if repair solved cause of malfunction.