Inspection Procedure: Procedure

WARNING: This page is about a different car, the 2011 Toyota Corolla. However, it is still accessible from the selected car via links, so may be relevant.

CHECK FOR OPEN IN CAN NO. 1 BUS MAIN WIRE (ECM MAIN WIRE)

Turn the ignition switch off.

Disconnect the ECM connector.

Fig 1: A50 Connector Terminal Identification

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TEXT IN ILLUSTRATION

*a	Front view of wire harness connector (to ECM)
*b	for 2AZ-FE
*c	for 2ZR-FE

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

Standard Resistance

Tester Connection	Switch Condition	Specified Condition
A50-41 (CANH) - A50-49 (CANL)*1	Ignition switch off	108 to 132 Ω
A50-8 (CANH) - A50-9 (CANL)*2	Ignition switch off	108 to 132 Ω

*1: for 2AZ-FE

*2: for 2ZR-FE

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to next step

CHECK WIRE HARNESS (POWER SOURCE CIRCUIT)

Check the ECM power source circuit (2ZR-FE: Refer to ECM Power Source Circuit , 2AZ-FE: Refer to ECM Power Source Circuit ).

Result

Result	Proceed to
OK (2ZR-FE)	A
OK (2AZ-FE)	B
NG	C

C → REPAIR OR REPLACE HARNESS OR CONNECTOR

B → See step 4

A → See step 3

REPLACE ECM (2ZR-FE). Refer to REMOVAL
REPLACE ECM (2AZ-FE). Refer to REMOVAL