Inspection Procedure

WARNING: This page is about a different car, the 2007 Lexus ES 350. However, it is still accessible from the selected car via links, so may be relevant.

INSPECT ECU TERMINAL VOLTAGE (+B TERMINAL)

Disconnect the TCM connector.
Turn the engine switch on (IG).

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

Standard voltage

VOLTAGE SPECIFICATION

Tester Connection	Specified Condition
+B (B40-18) - E1 (B40-8)	9 to 14 V

Fig 1: TCM Connector Terminal Identification

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OK: CHECK FOR INTERMITTENT PROBLEMS

NG: Go to Next Step

CHECK HARNESS AND CONNECTOR (TCM - BODY GROUND)

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

Standard resistance

RESISTANCE SPECIFICATION

Tester Connection	Specified Condition
E1 (B40-8) - Body ground	Below 1 Ω

Reconnect the TCM connector.

Fig 2: TCM Connector Terminal Identification

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (TCM - BODY GROUND)

OK: REPAIR OR REPLACE HARNESS OR CONNECTOR (TCM - EFI RELAY)