ECU Power Source Circuit

U760E AUTOMATIC TRANSMISSION / TRANSAXLE: AUTOMATIC TRANSAXLE SYSTEM: ECU Power Source Circuit
- ECU Power Source Circuit

DESCRIPTION

When the ignition switch is turned to ON, voltage from the MREL terminal of the ECM is applied to the EFI MAIN relay. This causes the contacts of the EFI MAIN relay to close, which supplies power to terminal +B of the TCM.

WIRING DIAGRAM

Refer to DTC U0100 U760E Automatic Transaxle.

INSPECTION PROCEDURE

NOTICE:
Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE

1. CHECK TCM (TCM - BODY GROUND)

(a) Disconnect the TCM connector.





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

Standard Resistance:





Text in Illustration





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

2. CHECK HARNESS AND CONNECTOR (INTEGRATION RELAY - TCM)

(a) Remove the integration relay from the engine room relay block Testing and Inspection.

(b) Disconnect the TCM connector.

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

Standard Resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- GO TO SFI SYSTEM (ECM POWER SOURCE CIRCUIT) ECM Power Source Circuit