Can Communication System (For Rhd With Central Gateway Ecu) Check Bus 3 Lines For Short Circuit

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK FOR SHORT IN CAN BUS WIRES (CENTRAL GATEWAY ECU - NO. 5 CAN JUNCTION CONNECTOR)

CONNECT CONNECTOR

CHECK FOR SHORT IN CAN BUS WIRES (NO. 2 CAN JUNCTION TERMINAL - NO. 6 CAN JUNCTION CONNECTOR)

CONNECT CONNECTOR

CHECK FOR SHORT IN CAN BUS WIRES (NO. 5 CAN JUNCTION CONNECTOR)

CONNECT CONNECTOR

CHECK FOR SHORT IN CAN BUS WIRES (NO. 6 CAN JUNCTION CONNECTOR)

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

DESCRIPTION

1. *1: for Multi-media Module Receiver Type
   
2. *2: w/ Bus Buffer ECU
   
3. *3: w/ Option Connector
   

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 central gateway ECU connector.
   

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

   Standard Resistance:

   Tester Connection	Condition	Specified Condition
   E145-6 (CA3H) - E145-21 (CA3L)	Cable disconnected from negative (-) battery terminal	108 to 132 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. 2 CAN junction terminal connector.
   

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

   Standard Resistance:

   Tester Connection	Condition	Specified Condition
   F98-3 (CANH) - F98-2 (CANL)	Cable disconnected from negative (-) battery terminal	108 to 132 Ω

   Text in Illustration

   *a	Rear view of wire harness connector (to No. 2 CAN Junction Terminal)

1. Reconnect the F98 No. 2 CAN junction terminal connector.
   

HINT:

If there is a short in the connection line while accessory parts are not connected, repair or replace the CAN bus branch line or connector.

1. Disconnect the No. 5 CAN junction connector.
   

   
   
   
   
   

   Text in Illustration

   *a	Rear view of wire harness connector (to No. 5 CAN Junction Connector)	*b	to Central Gateway ECU
   *c	to Bus Buffer ECU (w/ Bus Buffer ECU)	*d	to Multi-media Module Receiver Assembly (for Multi-media Module Receiver Type) to Option Connector (w/ Option Connector)
   *e	to No. 6 CAN Junction Connector	-	-

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

   Standard Resistance:

   Tester Connection	Condition	Specified Condition	Connect to
   E152-8 (CANH) - E152-19 (CANL)	Cable disconnected from negative (-) battery terminal	108 to 132 Ω	Central gateway ECU
   E152-9 (CANH) - E152-20 (CANL)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Bus buffer ECU*1
   E152-10 (CANH) - E152-21 (CANL)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Multi-media module receiver assembly*2 Option connector*3
   E152-11 (CANH) - E152-22 (CANL)	Cable disconnected from negative (-) battery terminal	108 to 132 Ω	No. 6 CAN junction connector

   1. *1: w/ Bus Buffer ECU
      
   2. *2: for Multi-media Module Receiver Type
      
   3. *3: w/ Option Connector
      

   Result

   Result	Proceed to
   OK	A
   NG (Central gateway ECU CAN main wire)	B
   NG (No. 6 CAN junction connector CAN main wire)	C
   NG (ECU or sensor CAN branch wires)	D

1. Reconnect the E152 No. 5 CAN junction connector.
   

1. Disconnect the No. 6 CAN junction connector.
   

   
   
   
   
   

   Text in Illustration

   *a	Rear view of wire harness connector (to No. 6 CAN Junction Connector)	*b	to No. 5 CAN Junction Connector
   *c	to No. 2 CAN Junction Terminal	-	-

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

   Standard Resistance:

   Tester Connection	Condition	Specified Condition	Connect to
   F99-6 (CANH) - F99-17 (CANL)	Cable disconnected from negative (-) battery terminal	108 to 132 Ω	No. 5 CAN junction connector
   F99-7 (CANH) - F99-18 (CANL)	Cable disconnected from negative (-) battery terminal	108 to 132 Ω	No. 2 CAN junction terminal

   Result

   Result	Proceed to
   OK	A
   NG (No. 5 CAN junction connector CAN main wire)	B
   NG (No. 2 CAN junction terminal CAN main wire)	C

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
   E145-6 (CA3H) - E145-21 (CA3L)	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.