TCM Power Source Circuit: Procedure

CHECK HARNESS AND CONNECTOR (TCM - BODY GROUND)

Disconnect the TCM connectors.

Fig 1: Identifying TCM Connector
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Turn the engine switch off.

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

Standard Resistance

Tester Connection	Condition	Specified Condition
A58-2 (E1) - Body ground	Always	Below 1 Ω

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to next step

CHECK HARNESS AND CONNECTOR (BATTERY - TCM)

Disconnect the TCM connectors.

Fig 2: Identifying TCM Connector
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Turn the engine switch on (IG).

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

Standard Voltage

Tester Connection	Switch Condition	Specified Condition
A58-5 (+B) - Body ground	Engine switch on (IG)	11 to 14 V

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR

OK → See step 3

GO TO ECM POWER SOURCE CIRCUIT (ENGINE CONTROL SYSTEM / SFI SYSTEM). Refer to ECM Power Source Circuit