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 IDs stored in the old ECU using a Techstream and write them down before removal.
* It is necessary to perform registration Programming and Relearning of the transmitter IDs into the tire pressure warning ECU after the ECU has been replaced.

PROCEDURE

1. INSPECT FUSE (ECU-IG)

(a) Remove the ECU-IG 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 (TIRE PRESSURE WARNING ECU - FUSE)
OK -- Continue to next step.

2. CHECK HARNESS AND CONNECTOR (TIRE PRESSURE WARNING ECU - BATTERY)

(a) Disconnect the E74 ECU connector.





(b) Measure the voltage according to the value(s) in the table below.

Standard voltage:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

3. CHECK HARNESS AND CONNECTOR (TIRE PRESSURE WARNING ECU - BODY GROUND)

(a) Disconnect the E74 ECU connector.





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

Standard resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE TIRE PRESSURE WARNING ECU Removal

4. CHECK HARNESS AND CONNECTOR (TIRE PRESSURE WARNING ECU - FUSE)

(a) Disconnect the E74 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