Inspection Procedure

WARNING: This page is about a different car, the 2008 Toyota RAV4. 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 main wire and 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 WIRE HARNESS (ECM - BATTERY AND BODY GROUND)

Disconnect the A9 and B30 ECM connectors.

Fig 1: Identifying A9 And B30 ECM Connectors
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Measure the resistance of the wire harness side connector.

Standard resistance:

for 2AZ-FE

RESISTANCE SPECIFICATION

Tester Connection	Specified Condition
B30-104 (E1) - Body ground	Below 1 Ω
B30-45 (E01) - Body ground	Below 1 Ω
B30-44 (E02) - Body ground	Below 1 Ω
B30-86 (E03) - Body ground	Below 1 Ω
B30-46 (E04) - Body ground	Below 1 Ω
B30-43 (ME01) - Body ground	Below 1 Ω

for 2GR-FE

RESISTANCE SPECIFICATION

Tester Connection	Specified Condition
B30-81 (E1) - Body ground	Below 1 Ω
B30-22 (E01) - Body ground	Below 1 Ω
B30-21 (E02) - Body ground	Below 1 Ω
B30-104 (E03) - Body ground	Below 1 Ω
B30-23 (E04) - Body ground	Below 1 Ω
B30-46 (E05) - Body ground	Below 1 Ω
B30-20 (ME01) - Body ground	Below 1 Ω

Measure the voltage of the wire harness side connector.

Standard voltage

VOLTAGE SPECIFICATION

Tester Connection	Condition	Specified Condition
A9-1 (+B2) - Body ground	When battery's positive (+) voltage is applied to terminal MREL	10 to 14 V
A9-2 (+B) - Body ground	When battery's positive (+) voltage is applied to terminal MREL	10 to 14 V
A9-3 (+BM) - Body ground	Always	10 to 14 V
A9-20 (BATT) - Body ground	Always	10 to 14 V
A9-28 (IGSW) - Body ground	Ignition switch ON	10 to 14 V

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: REPLACE ECM