Inspection Procedure

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

NOTE:

Turn the ignition switch off before measuring the resistances of the CAN main wire and the CAN 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 doors need to be opened in order to check connectors, open the doors and leave them open.
HINT:

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

CHECK CAN BUS LINE FOR DISCONNECTION (ECM MAIN WIRE)

Turn the ignition switch off.
Disconnect the A36 ECM connector.

Measure the resistance according to the value in the table below

Standard resistance

RESISTANCE REFERENCE CHART

Tester Connection	Switch Condition	Specified Condition
A36-41 (CANH) - A36-49 (CANL)	Ignition switch off	108 to 132 Ω

Fig 1: Identifying A36 ECM Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG : REPAIR OR REPLACE CAN MAIN WIRE CONNECTED TO ECM (CAN-H, CAN-L)

OK: Go to Next Step

CHECK HARNESS AND CONNECTOR (+B, +B2, IGSW, E1)

Disconnect the A36 and B33 ECM connector.

Measure the resistance according to the value in the table below.

Standard resistance

RESISTANCE REFERENCE CHART

Tester Connection	Condition	Specified Condition
B33-104 (E1) - Body ground	Always	Below 1 Ω

Measure the voltage according to the value in the table below.

Standard voltage

VOLTAGE SPECIFICATION

Tester Connection	Switch Condition	Specified Condition
A36-28 (IGSW) - Body ground	Ignition switch on (IG)	11 to 14 V

Fig 2: Identifying A36 And B33 ECM Connector Terminals

NG : REPAIR OR REPLACE HARNESS OR CONNECTOR

OK : REPLACE ECM (See REMOVAL )