TCM Power Source Circuit

AA80E AUTOMATIC TRANSMISSION: AUTOMATIC TRANSMISSION SYSTEM: TCM Power Source Circuit

TCM Power Source Circuit

DESCRIPTION

When the engine switch is turned on (IG), voltage from the ECM's MREL terminal is applied to the EFI MAIN 2 relay. This causes the contacts of the EFI MAIN 2 relay to close, which supplies power to terminal +B of the TCM.

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK TCM (POWER SOURCE, BODY GROUND)





(a) Disconnect the A12 and E5 TCM connectors.
(b) Turn the engine switch on (IG).
(c) Measure the voltage of the wire harness side connectors.
Standard voltage:





(d) Turn the engine switch off.
(e) Measure the resistance of the wire harness side connector.
Standard resistance:






NG -- CHECK HARNESS AND CONNECTOR (TCM - EFI MAIN NO. 2 RELAY, BODY GROUND)
OK -- GO TO ECM POWER SOURCE CIRCUIT (ENGINE CONTROL SYSTEM / SFI SYSTEM)