ECM Communication Stop Mode (FROM 12/2010): Procedure

WARNING: This page is about a different car, the 2011 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.

Fig 1: Identifying ECM Connector Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Disconnect the ECM connector (A55).

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

Standard resistance

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

NG → REPAIR OR REPLACE ECM MAIN BUS LINE OR CONNECTOR

OK: Go to next step

CHECK ENGINE ECU POWER SOURCE CIRCUIT
1. Check the ECM power source circuit. Refer to ECM Power Source Circuit .
NG → REPAIR OR REPLACE HARNESS OR CONNECTOR

OK → See step 3
REPLACE ECM. Refer to REMOVAL