Can Communication System (For Lhd With Central Gateway Ecu) Check Bus 2 Lines For Short Circuit

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK FOR SHORT IN CAN BUS WIRES (ECM - NO. 1 CAN JUNCTION CONNECTOR)

CONNECT CONNECTOR

CHECK FOR SHORT IN CAN BUS WIRES (COMBINATION METER ASSEMBLY - NO. 2 CAN JUNCTION CONNECTOR)

CONNECT CONNECTOR

CHECK FOR SHORT IN CAN BUS WIRES (CENTRAL GATEWAY ECU - NO. 1 CAN JUNCTION CONNECTOR)

CONNECT CONNECTOR

CHECK FOR SHORT IN CAN BUS WIRES (NO. 1 CAN JUNCTION CONNECTOR)

CONNECT CONNECTOR

CHECK FOR SHORT IN CAN BUS WIRES (NO. 2 CAN JUNCTION CONNECTOR)

CHECK FOR SHORT IN CAN BUS WIRES (ECU, SENSOR)

DESCRIPTION

1. *1: w/ Variable Flow Control Solenoid Valve
   
2. *2: w/ Tire Pressure Warning System
   
3. *3: w/ Entry and Start System
   
4. *4: w/ Variable Gear Ratio Steering System
   

WIRING DIAGRAM

INSPECTION PROCEDURE

NOTICE:

1. Because the order of diagnosis is important to allow correct diagnosis, make sure to begin troubleshooting using How to Proceed with Troubleshooting when CAN communication system related DTCs are output (Click here).
   
2. Before measuring the resistance of the CAN bus, turn the ignition switch off and leave the vehicle for 1 minute or more without operating the key, switches or opening or closing the doors. After that, disconnect the cable from the negative (-) battery terminal and leave the vehicle for 1 minute or more before measuring the resistance.
   
3. After turning the ignition switch off, waiting time may be required before disconnecting the cable from the battery terminal. Therefore, make sure to read the disconnecting the cable from the battery terminal notice before proceeding with work (Click here).
   
4. After the repair, perform CAN Bus Check and check that all the ECUs and sensors connected to the CAN communication system are displayed (Click here).
   

HINT:

1. Operating the ignition switch, any switches or any doors triggers related ECU and sensor communication with the CAN, which causes resistance variation.
   
2. 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 may help determine the cause of the malfunction.
   

1. Disconnect the cable from the negative (-) battery terminal.
   

2. Disconnect the ECM connector.
   

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

   Standard Resistance:

   for 1UR-FE, 1GR-FE:

   Tester Connection	Condition	Specified Condition
   A38-10 (CANH) - A38-11 (CANL)	Cable disconnected from negative (-) battery terminal	108 to 132 Ω

   for 1VD-FTV:

   Tester Connection	Condition	Specified Condition
   A38-41 (CANH) - A38-49 (CANL)	Cable disconnected from negative (-) battery terminal	108 to 132 Ω

   for 3UR-FE:

   Tester Connection	Condition	Specified Condition
   A38-11 (CANH) - A38-19 (CANL)	Cable disconnected from negative (-) battery terminal	108 to 132 Ω

   Text in Illustration

   *A	for 1UR-FE
   *B	for 1VD-FTV
   *C	for 3UR-FE
   *a	Front view of wire harness connector (to ECM)

   Result

   Result	Proceed to
   OK (for 1UR-FE)	A
   OK (for 1VD-FTV)	B
   OK (for 1GR-FE)	C
   OK (for 3UR-FE)	D
   NG	E

1. Reconnect the A38 ECM connector.
   

1. Disconnect the combination meter assembly connector.
   

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

   Standard Resistance:

   Tester Connection	Condition	Specified Condition
   E119-39 (CANH) - E119-40 (CANL)	Cable disconnected from negative (-) battery terminal	108 to 132 Ω

   Text in Illustration

   *a	Rear view of wire harness connector (to Combination Meter Assembly)

1. Reconnect the E119 combination meter assembly connector.
   

1. Disconnect the central gateway ECU connector.
   

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

   Standard Resistance:

   Tester Connection	Condition	Specified Condition
   E145-18 (CA4H) - E145-17 (CA4L)	Cable disconnected from negative (-) battery terminal	54 to 69 Ω

   Text in Illustration

   *a	Front view of wire harness connector (to Central Gateway ECU)

1. Reconnect the E145 central gateway ECU connector.
   

1. Disconnect the No. 1 CAN junction connector.
   

   
   
   
   
   

   Text in Illustration

   *a	Front view of wire harness connector (to No. 1 CAN Junction Connector)	*b	to No. 2 CAN Junction Connector
   *c	to 4WD Control ECU	*d	to Power Steering ECU Assembly (w/ Variable Flow Control Solenoid Valve)
   *e	to Airbag Sensor Assembly	*f	to Tire Pressure Warning ECU (w/ Tire Pressure Warning System)
   *g	to ECM	*h	to Air Conditioning Amplifier Assembly
   *i	to Central Gateway ECU	-	-

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

   Standard Resistance:

   Tester Connection	Condition	Specified Condition	Connect to
   E135-1 (CANH) - E135-11 (CANL)	Cable disconnected from negative (-) battery terminal	108 to 132 Ω	No. 2 CAN junction connector
   E135-2 (CANH) - E135-12 (CANL)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	4WD control ECU
   E135-3 (CANH) - E135-13 (CANL)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Power steering ECU assembly*1
   E135-4 (CANH) - E135-14 (CANL)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Airbag sensor assembly
   E135-5 (CANH) - E135-15 (CANL)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Tire pressure warning ECU*2
   E135-7 (CANH) - E135-17 (CANL)	Cable disconnected from negative (-) battery terminal	108 to 132 Ω	ECM
   E135-8 (CANH) - E135-18 (CANL)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Air conditioning amplifier assembly
   E135-9 (CANH) - E135-19 (CANL)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Central gateway ECU

   1. *1: w/ Variable Flow Control Solenoid Valve
      
   2. *2: w/ Tire Pressure Warning System
      

   Result

   Result	Proceed to
   OK	A
   NG (ECM CAN main wire)	B
   NG (Central gateway ECU CAN branch wire)	C
   NG (No. 2 CAN junction connector CAN main wire)	D
   NG (ECU or sensor CAN branch wires)	E

1. Reconnect the E135 No. 1 CAN junction connector.
   

1. Disconnect the No. 2 CAN junction connector.
   

   
   
   
   
   

   Text in Illustration

   *a	Front view of wire harness connector (to No. 2 CAN Junction Connector)	*b	to No. 1 CAN Junction Connector
   *c	to Main Body ECU (Multiplex Network Body ECU)	*d	to Master Cylinder Solenoid (Skid Control ECU)
   *e	to Headlight Leveling ECU Assembly	*f	to Certification ECU (Smart Key ECU Assembly) (w/ Entry and Start System)
   *g	to Combination Meter Assembly	*h	to Steering Control ECU (w/ Variable Gear Ratio Steering System)
   *i	to Spiral with Sensor Cable Sub-assembly (Steering Angle Sensor)	-	-

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

   Standard Resistance:

   Tester Connection	Condition	Specified Condition	Connect to
   E133-1 (CANH) - E133-11 (CANL)	Cable disconnected from negative (-) battery terminal	108 to 132 Ω	No. 1 CAN junction connector
   E133-2 (CANH) - E133-12 (CANL)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Main body ECU (multiplex network body ECU)
   E133-3 (CANH) - E133-13 (CANL)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Master cylinder solenoid (skid control ECU)
   E133-4 (CANH) - E133-14 (CANL)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Headlight leveling ECU assembly
   E133-6 (CANH) - E133-16 (CANL)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Certification ECU (smart key ECU assembly)*1
   E133-7 (CANH) - E133-17 (CANL)	Cable disconnected from negative (-) battery terminal	108 to 132 Ω	Combination meter assembly
   E133-8 (CANH) - E133-18 (CANL)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Steering control ECU*2
   E133-10 (CANH) - E133-20 (CANL)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Spiral with sensor cable sub-assembly (steering angle sensor)

   1. *1: w/ Entry and Start System
      
   2. *2: w/ Variable Gear Ratio Steering System
      

   Result

   Result	Proceed to
   OK	A
   NG (Combination meter assembly CAN main wire)	B
   NG (No. 1 CAN junction connector CAN main wire)	C
   NG (ECU or sensor CAN branch wires)	D

1. Reconnect the CAN junction connector.
   

2. Disconnect the connector that includes terminals CANH and CANL from the ECU or sensor to which the short circuited CAN branch wire is connected.
   

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

   Standard Resistance:

   Tester Connection	Condition	Specified Condition
   E145-18 (CA4H) - E145-17 (CA4L)	Cable disconnected from negative (-) battery terminal	54 to 69 Ω

   Text in Illustration

   *a	Component with harness connected (Central Gateway ECU)

   HINT:

   If the resistance becomes normal (between 54 and 69 Ω) when the connector is disconnected from the ECU or sensor, there may be a short in the ECU or sensor.