Inspection Procedure

NOTE:

Turn the ignition switch off before measuring the resistance of CAN bus main wires and the CAN bus branch wires.
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 any doors need to be opened in order to check the connectors, open the doors and leave them open.

HINT:

Operating the ignition switch, any switches or a door triggers related ECU and sensor communication with the CAN. This communication will cause the resistance value to change.
Even after DTCs are cleared, if a DTC is stored again after driving the vehicle for a while, the malfunction may be occurring due to vibration of the vehicle. In such a case, wiggling the ECUs or wire harness while performing the inspection below will help determine the cause of the malfunction.

CHECK CAN NO. 2 BUS WIRE

Turn the ignition switch off.

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

Standard Resistance

RESISTANCE SPECIFIED CONDITIONS

Tester Connection	Condition	Result	Proceed to
E53-13 (CA2H) - E53-12 (CA2L)	Ignition switch off	54 to 69 Ω	Below 53 Ω: Short in line
E53-13 (CA2H) - E53-12 (CA2L)	Ignition switch off	54 to 69 Ω	70 Ω or higher: Open in CAN main bus line
E53-13 (CA2H) - E15-16 (BAT)	Cable is disconnected from negative (-) battery terminal	6 kΩ or higher	Below 6 kΩ: +B short
E53-12 (CA2L) - E15-16 (BAT)	Cable is disconnected from negative (-) battery terminal	6 kΩ or higher	Below 6 kΩ: +B short
E53-13 (CA2H) - E15-4 (CG)	Ignition switch off	200 Ω or higher	Below 200 Ω: Ground short
E53-12 (CA2L) - E15-4 (CG)	Ignition switch off	200 Ω or higher	Below 200 Ω: Ground short

Fig 1: Identifying Network Gateway ECU And E15 Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Result

RESULT CHART

Result	Proceed to
OK	A
Open in CAN main bus line	B
Short in line +B short Ground short	C

B: Go to step 9

C: Go to step 12

A: Go to Next Step

CHECK OPEN IN CAN BUS WIRE (4WD CONTROL ECU)

Turn the ignition switch off.
Disconnect the 4WD control ECU connector.

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

Standard Resistance

RESISTANCE SPECIFIED CONDITIONS

Tester Connection	Switch Condition	Specified Condition
E17-14 (CANH) - E17-16 (CANL)	Ignition switch off	54 to 69 Ω

Fig 2: Identifying 4WD Control ECU Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE CAN NO. 2 BUS BRANCH WIRE OR CONNECTOR (4WD CONTROL ECU BRANCH WIRE)

OK: Go to Next Step

CHECK WIRE HARNESS (4WD CONTROL ECU - BATTERY AND BODY GROUND)

Disconnect the 4WD control ECU connector.

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

Standard Resistance

RESISTANCE SPECIFIED CONDITIONS

Tester Connection	Switch Condition	Specified Condition
E17-23 (GND) - Body ground	Ignition switch off	Below 1 Ω

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

Standard Voltage

VOLTAGE SPECIFIED CONDITIONS

Tester Connection	Switch Condition	Specified Condition
E17-11 (IG1) - Body ground	Ignition switch on	10 to 14 V

Fig 3: Identifying 4WD Control ECU Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (4WD CONTROL ECU POWER SOURCE CIRCUIT)

OK: Go to Next Step

CONNECT
1. Reconnect the 4WD control ECU connector.
CLEAR DTC
1. Clear the DTC.

RECONFIRM DTC OUTPUT

Check the DTC.

Result

DTC OUTPUT RESULT

Result	Proceed to
DTC U0114 and U1002 are not output	A
DTC U0114 and U1002 are output	B

B: Go to step 7

A: CHECK CONNECTOR CONNECTION CONDITION (See ELECTRONIC CIRCUIT INSPECTION PROCEDURE )

REPLACE NETWORK GATEWAY ECU
REMOVAL
1. Replace the network gateway ECU.

RECONFIRM DTC OUTPUT

Check the DTC.

Result

DTC OUTPUT RESULT

Result	Proceed to
DTC U0114 and U1002 are not output	A
DTC U0114 and U1002 are output	B

B: REPLACE 4WD ECU ASSEMBLY (See 4WD CONTROL ECU )

A: END

CHECK FOR OPEN IN CAN NO. 2 BUS MAIN WIRE (NETWORK GATEWAY ECU - CAN NO. 3 JUNCTION CONNECTOR)

Disconnect the network gateway ECU connector.

Measure the resistance of the wire harness side connectors.

Standard Resistance

RESISTANCE SPECIFIED CONDITIONS

Tester Connection	Switch Condition	Specified Condition
E53-13 (CA2H) - E53-12 (CA2L)	Ignition switch off	108 to 132 Ω

Fig 4: Identifying Network Gateway ECU Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: Go to step 10

OK: REPLACE NETWORK GATEWAY ECU

CONNECT
1. Reconnect the network gateway ECU connector.

CHECK FOR OPEN IN CAN NO. 2 BUS MAIN WIRE (CAN NO. 3 JUNCTION CONNECTOR NETWORK GATEWAY ECU)

Disconnect the CAN No. 3 junction connector (E68).

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

Standard Resistance

RESISTANCE SPECIFIED CONDITIONS

Tester Connection	Switch Condition	Specified Condition
E68-1 (CANH) - E68-2 (CANL)	Ignition switch off	108 to 132 Ω

Fig 5: Identifying Can No. 3 Junction Connector (E68) Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: CHECK FOR SHORT IN CAN NO. 2 BUS WIRE (CAN NO. 3 JUNCTION CONNECTOR NETWORK GATEWAY MAIN WIRE)

OK: REPAIR OR REPLACE INSTRUMENT PANEL WIRE (CAN NO. 3 JUNCTION CONNECTOR)

CHECK FOR SHORT IN CAN NO. 2 BUS WIRE

Disconnect the network gateway ECU connector.

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

Standard Resistance

RESISTANCE SPECIFIED CONDITIONS

Tester Connection	Condition	Result
E53-13 (CA2H) - E53-12 (CA2L)	Ignition switch off	108 to 132 Ω
E53-13 (CA2H) - E15-16 (BAT)	Cable is disconnected from negative (-) battery terminal	6 kΩ or higher
E53-12 (CA2L) - E15-16 (BAT)	Cable is disconnected from negative (-) battery terminal	6 kΩ or higher
E53-13 (CA2H) - E15-4 (CG)	Ignition switch off	200 Ω or higher
E53-12 (CA2L) - E15-4 (CG)	Ignition switch off	200 Ω or higher

Fig 6: Identifying Network Gateway ECU And DLC3 Connector Terminals

NG: Go to step 13

OK: REPLACE NETWORK GATEWAY ECU

CHECK FOR SHORT IN CAN NO. 2 BUS WIRE (4WD CONTROL ECU BRANCH WIRE)

Disconnect the CAN No. 3 junction connector (E66).

Fig 7: Identifying CAN No. 3 Junction Connector (E66) Connector Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

Standard Resistance

RESISTANCE SPECIFIED CONDITIONS

Tester Connection	Condition	Specified Condition
E53-13 (CA2H) - E53-12 (CA2L)	Ignition switch off	108 to 132 Ω
E53-13 (CA2H) - E15-16 (BAT)	Cable is disconnected from negative (-) battery terminal	6 kΩ or higher
E53-12 (CA2L) - E15-16 (BAT)	Cable is disconnected from negative (-) battery terminal	6 kΩ or higher
E53-13 (CA2H) - E15-4 (CG)	Ignition switch off	200 Ω or higher
E53-12 (CA2L) - E15-4 (CG)	Ignition switch off	200 Ω or higher

Fig 8: Identifying Network Gateway ECU And DLC3 Connector Terminals

NG: Go to step 15

OK: Go to Next Step

CHECK FOR SHORT IN CAN NO. 2 BUS WIRE (4WD CONTROL ECU BRANCH WIRE)

Disconnect the 4WD control ECU connector.

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

Standard Resistance

RESISTANCE SPECIFIED CONDITIONS

Tester Connection	Condition	Specified Condition
E17-14 (CANH) - E17-16 (CANL)	Ignition switch off	1 MΩ or higher
E17-14 (CANH) - E15-16 (BAT)	Cable is disconnected from negative (-) battery terminal	6 kΩ or higher
E17-16 (CANL) - E15-16 (BAT)	Cable is disconnected from negative (-) battery terminal	6 kΩ or higher
E17-14 (CANH) - E17-23 (GND)	Ignition switch off	200 Ω or higher
E17-16 (CANL) - E17-23 (GND)	Ignition switch off	200 Ω or higher

Fig 9: Identifying 4WD Control ECU And DLC3 Connector Terminals

NG: REPAIR OR REPLACE CAN NO. 2 BUS BRANCH WIRE OR CONNECTOR (4WD CONTROL ECU BRANCH WIRE)

OK: REPLACE 4WD ECU ASSEMBLY (See 4WD CONTROL ECU )

CHECK FOR SHORT IN CAN NO. 2 BUS WIRE (CAN NO. 3 JUNCTION CONNECTOR NETWORK GATEWAY MAIN WIRE)

Disconnect the CAN No. 3 junction connector (E68).

Fig 10: Identifying Can No. 3 Junction Connector (E68) Connector Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

Standard Resistance

RESISTANCE SPECIFIED CONDITIONS

Tester Connection	Condition	Specified Condition
E53-13 (CA2H) - E53-12 (CA2L)	Ignition switch off	1 MΩ or higher
E53-13 (CA2H) - E15-16 (BAT)	Cable is disconnected from negative (-) battery terminal	6 kΩ or higher
E53-12 (CA2L) - E15-16 (BAT)	Cable is disconnected from negative (-) battery terminal	6 kΩ or higher
E53-13 (CA2H) - E15-4 (CG)	Ignition switch off	200 Ω or higher
E53-12 (CA2L) - E15-4 (CG)	Ignition switch off	200 Ω or higher

Fig 11: Identifying Network Gateway ECU And DLC3 Connector Terminals

NG: REPAIR OR REPLACE CAN NO. 2 BUS MAIN WIRE OR CONNECTOR (NETWORK GATEWAY ECU - CAN NO. 3 JUNCTION CONNECTOR)

OK: REPAIR OR REPLACE INSTRUMENT PANEL WIRE (CAN NO. 3 JUNCTION CONNECTOR)