Inspection Procedure
WARNING: This page is about a different car, the 2006 Lexus IS 350 and 2006 Lexus IS 250. However, it is still accessible from the selected car via links, so may be relevant.
- INSPECT FUSE (ECU-IG LH)
- Remove the ECU-IG LH fuse from the cowl side J/B LH.
- Measure the resistance of the fuse.
Standard resistance: Below 1 Ω
NG: REPLACE FUSE
OK: Go to next step.
- CHECK WIRE HARNESS (TIRE PRESSURE MONITOR ECU - BATTERY AND BODY GROUND)
- Disconnect the J49 ECU connector.
- Measure the voltage and resistance of the wire harness side connector
Standard voltage
TESTER CONNECTION AND SPECIFIED CONDITION TABLETester Connection Condition Specified Condition IG (J49-1) - Body ground Engine switch on (IG) 10 to 14 V Standard resistance
TESTER CONNECTION AND SPECIFIED CONDITION TABLETester Connection Specified Condition GND (J49-6) - Body ground Below 1 ohms
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NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
OK: Go to next step.
- CHECK RESISTANCE COMMUNICATION LINE
- Disconnect the J49, J34 and J76 ECU connectors.
- Measure the resistance between the specified terminals on the wire harness side connectors.
Standard resistance
TESTER CONNECTION AND SPECIFIED CONDITION TABLETester Connection Specified Condition MPX1 (J49-3) - MPX- (J34-18) Below 1 ohms MPX2 (J49-2) - MPI1 (J76-4) Below 1 ohms Result
RESULT DESCRIPTION TABLEResult Proceed to Both are OK A One is OK B Both are NG C
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B: REPAIR OR REPLACE HARNESS OR CONNECTOR
C: REPLACE TIRE PRESSURE MONITOR ECU AND REPAIR OR REPLACE HARNESS OR CONNECTOR
A: REPLACE TIRE PRESSURE MONITOR ECU