TB4 - Check Continuity of the TCS Harness

- Key Off.

- Breakout box installed, leave PCM disconnected.

- Measure the resistance between TCS key power at the fuse panel (ohmmeter positive probe) and power side of the TCS vehicle harness connector (ohmmeter negative probe).

- Is the resistance less than 5.0 ohms?

YES -- GO to TB5. TB5 - Check Harness Circuit For Shorts to Power

NO -- SERVICE open circuit. REMOVE breakout box. RECONNECT all components. Rerun quick test. Diagnostic Subroutines (DSR) - Extracting Codes