Inspection Procedure

WARNING: This page is about a different car, the 2009 Toyota Corolla. However, it is still accessible from the selected car via links, so may be relevant.

NOTE:

Turn the ignition switch off before measuring the resistance of the main CAN bus wires and the CAN Bus branch wire.
After the ignition switch is turned off, check that the key reminder warning system and light reminder warning system are not in operation.

Before measuring the resistance, leave the vehicle as is for at least 1 minute and do not operate the ignition switch, any other switches or the doors. If any doors need to be opened in order to check the connectors, open the doors and leave them open.

HINT:

Operating the ignition switch, any other switches or a door triggers related ECU and sensor communication on the CAN. This communication will cause the resistance value to change.
Even after DTCs are cleared, if a DTC is stored again after driving the vehicle for a while, the malfunction may be occurring due to vibration of the vehicle. In such a case, wiggling the ECUs or wire harness while performing the inspection below will help determine the cause of the malfunction.

CHECK DLC3

Turn the ignition switch off.
Measure the resistance according to the value (s) in the table below.

Standard Resistance

STANDARD RESISTANCE SPECIFICATION

Tester Connection	Switch Condition	Specified Condition
E11-6 (CANH) - E11-14 (CANL)	Ignition switch off	108 to 132 Ω

NOTE: When the measured value is 132 Ω or higher and a CAN communication system diagnostic trouble code is output, there may be a fault besides disconnection of the DLC3 branch wire. For that reason, troubleshooting should be performed again from How to Proceed with Troubleshooting (See HOW TO PROCEED WITH TROUBLESHOOTING ) after repairing the trouble area.

NG: REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO DLC3

Fig 1: Identifying E11 DLC3

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: Go to Next Step

CHECK FOR OPEN IN CAN BUS MAIN WIRE (CAN NO. 2 JUNCTION CONNECTOR)

Turn the ignition switch off.
Disconnect the CAN No. 2 junction connector.
Measure the resistance according to the value (s) in the table below.

Standard Resistance

STANDARD RESISTANCE SPECIFICATION

Tester Connection	Switch Condition	Specified Condition
A47-9 (CANH) - A47-20 (CANL)	Ignition switch off	108 to 132 Ω

Fig 2: Identifying A47 CAN No. 2 Junction Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: Go to step 5

OK: Go to Next Step

CHECK FOR OPEN IN CAN BUS MAIN WIRE (ECM)

Turn the ignition switch off.
Reconnect the CAN No. 2 junction connector.
Disconnect the ECM connector.
Measure the resistance according to the value (s) in the table below.

Standard Resistance

STANDARD RESISTANCE SPECIFICATION

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

Result

RESULT REFERENCE

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

B: REPLACE ECM (See REMOVAL )

C: Go to step 4

Fig 3: Identifying A50 ECM Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

A: REPLACE ECM (See REMOVAL )

CHECK FOR OPEN IN CAN BUS MAIN WIRE (CAN NO. 2 JUNCTION CONNECTOR - ECM)

Reconnect the ECM connector.
Turn the ignition switch off.
Disconnect the CAN No. 2 junction connector.
Measure the resistance according to the value (s) in the table below.

Standard Resistance

STANDARD RESISTANCE SPECIFICATION

Tester Connection	Switch Condition	Specified Condition
A47-10 (CANH) - A47-21 (CANL)	Ignition switch off	108 to 132 Ω

NG: REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (CAN NO. 2 JUNCTION CONNECTOR - ECM)

Fig 4: Identifying A47 CAN No. 2 Junction Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: REPLACE CAN NO. 2 JUNCTION CONNECTOR

CHECK FOR OPEN IN CAN BUS MAIN WIRE (COMBINATION METER)

Reconnect the CAN No. 2 junction connector.
Turn the ignition switch off.
Disconnect the combination meter connector.
Measure the resistance according to the value (s) in the table below.

Standard Resistance

STANDARD RESISTANCE SPECIFICATION

Tester Connection	Switch Condition	Specified Condition
E46-27 (CANH) - E46-28 (CANL)	Ignition switch off	108 to 132 Ω

NG: Go to step 6

Fig 5: Identifying E46 Combination Meter Connector

OK: REPLACE COMBINATION METER ASSEMBLY (See COMBINATION METER )

CHECK FOR OPEN IN CAN BUS MAIN WIRE (CAN NO. 1 JUNCTION CONNECTOR COMBINATION METER)

Reconnect the combination meter connector.
Turn the ignition switch off.
Disconnect the CAN No. 1 junction connector.
Measure the resistance according to the value (s) in the table below.

Standard Resistance

STANDARD RESISTANCE SPECIFICATION

Tester Connection	Switch Condition	Specified Condition
E58-2 (CANH) - E58-13 (CANL)	Ignition switch off	108 to 132 Ω

NG: REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (CAN NO. 1 JUNCTION CONNECTOR - COMBINATION METER)

Fig 6: Identifying E58 Combination Meter Connector

OK: Go to Next Step

CHECK FOR OPEN IN CAN BUS MAIN WIRE (CAN NO. 1 JUNCTION CONNECTOR - CAN NO. 2 JUNCTION CONNECTOR)

Turn the ignition switch off.
Disconnect the CAN No. 1 junction connector.
Measure the resistance according to the value (s) in the table below.

Standard Resistance

STANDARD RESISTANCE SPECIFICATION

Tester Connection	Switch Condition	Specified Condition
E58-10 (CANH) - E58-21 (CANL)	Ignition switch off	108 to 132 Ω

NG: REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (CAN NO. 1 JUNCTION CONNECTOR - CAN NO. 2 JUNCTION CONNECTOR)

Fig 7: Identifying E58 CAN No. 1 Junction Connector

OK: REPLACE CAN NO. 1 JUNCTION CONNECTOR