Inspection Procedure

HINT:

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

DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL
1. Disconnect the cable from the negative (-) battery terminal before measuring the resistances of the main wire and the branch wire.
CAUTION: Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

CHECK FOR OPEN IN CAN BUS WIRE (MAIN BODY ECU BRANCH WIRE)

Disconnect the E3 main body ECU (cowl side junction block LH) connector.
Measure the resistance according to the value (s) in the table below.
Standard Resistance

STANDARD RESISTANCE SPECIFICATION

Tester Connection	Switch Condition	Specified Condition
E3-5 (CANH) - E3-6 (CANL)	Engine switch off	54 to 69 Ω

NG: REPAIR OR REPLACE MAIN BODY ECU BRANCH WIRE OR CONNECTOR (COWL SIDE JUNCTION BLOCK) (CANH, CANL)

Fig 1: Identifying E3 Main Body ECU Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: Go to Next Step

CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - BATTERY AND BODY GROUND)

Connect the cable to the negative (-) battery terminal.

Fig 2: Identifying 2A & 2D Main Body ECU Connectors
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Disconnect the 2A and 2D main body ECU (cowl side junction block LH) connectors.
Disconnect the E3 main body ECU (cowl side junction block LH) connector.

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

Standard Resistance

STANDARD RESISTANCE SPECIFICATION

Tester Connection	Condition	Specified Condition
2D-62 (GND2) - Body ground	Always	Below 1 Ω
E3-1 (GND3) - Body ground	Always	Below 1 Ω

Measure the voltage according to the value (s) in the table below.
Standard Voltage

STANDARD VOLTAGE SPECIFICATION

Tester Connection	Condition	Specified Condition
2A-1 (ALTB) - Body ground	Always	11 to 14 V

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: REPLACE MAIN BODY ECU (COWL SIDE JUNCTION BLOCK LH)