Without Lexus Hand-Held Tester

Connectors of the ECM are water-proof and are the bolt type. For water proof type connectors, in order to measure the voltage of ECM terminals and the resistance of connected parts, connect the inspection sub wire harness between the ECM and vehicle wire harness, then perform the inspection. The inspection method of inserting a tester probe from the other side of connector noticeably reduces the water-proof ability.
- Disconnect the connector by fully loosening the bolt.

PREPARATION:
1. Turn the ignition switch to LOCK position.
2. Turn up the passenger side floor mat.
3. Remove the ECM protector.





4. Disconnect the connector from the ECM.
- After completely loosening the bolt, the 2 parts of the connector can be separated.

NOTICE:
- Do not pull the wire harness when disconnecting the connector.
- When disconnecting the connector, the ECM's back-up power source is cut off, so the malfunction codes, etc. recorded in the ECM memory are cancelled.
- Never insert a tester probe or male terminal used for inspection purposes into the female terminal of the vehicle wire harness. Otherwise, the female terminal may be widened, which can result in faulty connection.





5. Connect the check harness A (SST 09990-01000) between ECM and connector of vehicle wire harness.

HINT: The arrangement of the data link connector 1 terminals are the same as those of the ECM.

6. Disconnect check harness A.
7. Reconnect the connector to the ECM.
- Match the male connector correctly with the female connector, then press them together.
- Tighten the bolt.








- Make sure the connector is completely connected, by tightening the bolt until there is a clearance of less than 1 mm (0.04 in) between bottom of the male connector and end of the female connector.
8. Install the ECM protector and floor mat.








ECM TERMINAL IDENTIFICATION








STANDARD VALUE OF ECM TERMINALS