Inspection Procedure

WARNING: This page is about a different car, the 2008 Toyota Sequoia. However, it is still accessible from the selected car via links, so may be relevant.

HINT:

Operating the ignition switch, any switches or any doors triggers related ECU and sensor communication with the CAN, which causes resistance variation.

CHECK HARNESS AND CONNECTOR (ECM - BATTERY AND BODY GROUND)

Disconnect the A27 and D56 ECM connectors.

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

Standard Resistance

TESTER CONNECTION SPECIFIED CONDITION REFERENCE CHART

Tester Connection	Condition	Specified Condition
D56-81 (E1) - Body ground	Always	Below 1 Ω
D56-42 (E02) - Body ground
D56-43 (E01) - Body ground
D56-82 (ME01) - Body ground

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

Fig 1: Identifying A27 And D56 ECM Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard Voltage

TESTER CONNECTION SPECIFIED CONDITION REFERENCE CHART

Tester Connection	Condition	Specified Condition
A27-1 (BATT) - Body ground	Always	11 to 14 V
A27-2 (+B2) - Body ground	Battery positive (+) voltage is applied to terminal MREL
A27-3 (+B) - Body ground	Battery positive (+) voltage is applied to terminal MREL
A27-34 (MREL) - Body ground	Ignition switch off

Result

RESULT CHART

Result	Proceed to
OK (for 2UZ-FE)	A
OK (for 3UR-FE)	B
NG	C

B: REPLACE ECM (See REMOVAL )

C: REPAIR OR REPLACE HARNESS OR CONNECTOR

A: REPLACE ECM (See REMOVAL )