Check For Intermittent Problems

TOYOTA hand-held tester ONLY




By putting the vehicle's ECM in check mode, one trip detection logic is possible instead of 2 trip detection logic and sensitivity to detect open circuits is in- creased. This makes it easier to detect intermittent problems.

1. CLEAR DIAGNOSTIC TROUBLE CODES.
2. SET CHECK MODE.
- Follow the hand-held tester's screen prompts.

HINT: After canceling out the diagnostic trouble codes in memory and setting the check mode, if the MIL does not go OFF after the engine is started, check thoroughly for faulty contact, etc., then try the check again. If the MIL still does not go OFF, check and replace the ECM.

3. PERFORM A SIMULATION TEST.






Using the symptom simulation, apply vibration to and pull lightly on the wire harness, connector or terminals in the circuit indicated by the malfunction code. In this test, if the MIL lights up, it indicates that the place where the wire harness, connector or terminals being pulled or vibrated has faulty contact. Check that point for loose connection, dirt on the terminals, poor fit or other problems and repair as necessary.