ECU Power Source Circuit

TIRE AND WHEEL: TIRE PRESSURE WARNING SYSTEM: ECU Power Source Circuit

ECU Power Source Circuit

DESCRIPTION

This is the power source for the tire pressure warning ECU.

WIRING DIAGRAM





INSPECTION PROCEDURE

NOTICE:
- When replacing the tire pressure warning ECU, read the transmitter IDs stored in the old ECU using the Techstream and write them down before removal.
- It is necessary to perform initialization (Initialization) after registration (Registration) of the transmitter IDs into the tire pressure warning ECU after the ECU and/or tire pressure warning valve and transmitter has been replaced.

PROCEDURE

1. INSPECT FUSE (ECU-IG)
(a) Remove the ECU-IG No. 1 fuse from the main body ECU.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:





NG -- CHECK HARNESS AND CONNECTOR (ECU - BATTERY)
OK -- Continue to next step.
2. CHECK HARNESS AND CONNECTOR (ECU - BATTERY AND BODY GROUND)
(a) Disconnect the J31 ECU connector.





(b) Measure the voltage and resistance according to the value(s) in the table below.
Standard Voltage:





Standard Resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE TIRE PRESSURE WARNING ECU
3. CHECK HARNESS AND CONNECTOR (ECU - BATTERY)
(a) Disconnect the J31 ECU connector.





(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:





NG -- REPLACE FUSE AND REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE FUSE