Can Communication System (For Lhd Without Central Gateway Ecu) Short In Can Bus Lines

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 (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
   
5. *5: for Multi-media Module Receiver Type
   
6. *6: for Radio and Display Type
   

WIRING DIAGRAM

INSPECTION PROCEDURE

NOTICE:

1. 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.
   
2. 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).
   

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 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 Bus Buffer ECU (w/ Bus Buffer ECU)	*h	to ECM
   *i	to Air Conditioning Amplifier Assembly	-	-

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
   E135-6 (CANH) - E135-16 (CANL)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Bus buffer ECU*3
   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

   1. *1: w/ Variable Flow Control Solenoid Valve
      
   2. *2: w/ Tire Pressure Warning System
      
   3. *3: w/ Bus Buffer ECU
      

   Result

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

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 Multi-media Module Receiver Assembly (for Multimedia Module Receiver Type) to Radio and Display Receiver Assembly (for Radio and Display Type)
   *g	to Certification ECU (Smart Key ECU Assembly) (w/ Entry and Start System)	*h	to Combination Meter Assembly
   *i	to Spiral with Sensor Cable Sub-assembly (Steering Angle Sensor) to Steering Control ECU (w/ Variable Gear Ratio Steering System)	*j	to DLC3
   *k	to Steering Control ECU (w/ Variable Gear Ratio Steering System)

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
   E133-5 (CANH) - E133-15 (CANL)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Multi-media module receiver assembly*1 Radio and display receiver assembly*2
   E133-6 (CANH) - E133-16 (CANL)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Certification ECU (smart key ECU assembly)*3
   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*4
   E133-9 (CANH) - E133-19 (CANL)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	DLC3
   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: for Multi-media Module Receiver Type
      
   2. *2: for Radio and Display Type
      
   3. *3: w/ Entry and Start System
      
   4. *4: 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 (DLC3 CAN branch wires)	D
   NG (ECU or sensor CAN branch wires)	E

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
   E22-6 (CANH) - E22-14 (CANL)	Cable disconnected from negative (-) battery terminal	54 to 69 Ω

   Text in Illustration

   *a	Front view of DLC3

   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.