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 (NETWORK GATEWAY ECU BRANCH WIRE)

Disconnect the E31 network gateway ECU connector.
Measure the resistance according to the value (s) in the table below.
Standard Resistance

STANDARD RESISTANCE SPECIFICATION

Tester Connection	Switch Condition	Specified Condition
E31-16 (CA1H) - E31-15 (CA1L)	Engine switch off	54 to 69 Ω

NG: REPAIR OR REPLACE NETWORK GATEWAY ECU BRANCH WIRE OR CONNECTOR (CA1H, CA1L)

Fig 1: Identifying E31 Network Gateway ECU Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: Go to Next Step

CHECK HARNESS AND CONNECTOR (NETWORK GATEWAY ECU - BATTERY AND BODY GROUND)

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

Standard Resistance

STANDARD RESISTANCE SPECIFICATION

Tester Connection	Condition	Specified Condition
E31-4 (GND) - Body ground	Always	Below 1 Ω

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

STANDARD VOLTAGE SPECIFICATION

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

Fig 2: Identifying E31 Network Gateway ECU Connector

OK: REPLACE NETWORK GATEWAY ECU (See NETWORK GATEWAY ECU )