Inspection Procedure

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

CHECK CAN BUS WIRE (ECM MAIN BUS LINE DISCONNECTION)

Turn the ignition switch off.
Disconnect the ECM connector (A55).

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

Resistance

RESISTANCE SPECIFICATION

Tester Connection	Condition	Specified value
A55-49 (CANH) - A55-41 (CANL)	Ignition switch off	108 to 132 Ω

NG: REPAIR OR REPLACE ECM MAIN BUS LINE OR CONNECTOR (CAN-H, CAN-L)

Fig 1: Identifying ECM Connector Terminals

OK: Go to next step

CHECK ENGINE ECU POWER SOURCE CIRCUIT
1. Check the ECM power source circuit (See ECM POWER SOURCE CIRCUIT ).
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK : REPLACE ECM (See REMOVAL )