Inspection Procedure

WARNING: This page is about a different car, the 2004 Lexus ES 330. However, it is still accessible from the selected car via links, so may be relevant.

HINT: Read freeze frame data using the hand-held tester or the OBD II scan tool. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data from the time the malfunction occurred.

CHECK COOLING SYSTEM
1. Check that there is a defect in the cooling system which causes overcool, such as abnormal radiator fan operation, modified cooling system and so on.
NG: REPAIR OR REPLACE COOLING SYSTEM

OK: GO TO NEXT STEP.
INSPECT THERMOSTAT (See INSPECTION )
NG: REPLACE THERMOSTAT

OK: GO TO NEXT STEP.

REPLACE ECM (See ECM (3MZ-FE) )