How To Proceed With Troubleshooting

Standard voltage: 

11 to 14 V 

HINT:

If the voltage is below 11V, recharge or replace the battery before proceeding.

HINT:

• CAN communication DTCs are output when there is an open or short in any of the communication wires. Any problems with the power source of a corresponding ECU or sensor, or problems in the ECU, the sensor itself also cause these DTCs to be output.
• If a CAN communication wire connector is disconnected with the ignition switch on (IG), the ECUs of the corresponding system and related systems record a DTC.

1. Based on the vehicle equipment and specifications, confirm the systems that use CAN communication (See DIAGNOSIS SYSTEM  ).

HINT:

Operating the ignition switch, any other switches, or a door triggers related ECU and sensor communication on the CAN. This communication will cause the resistance value to change.

1. Turn the ignition switch off.
2. Measure the resistance according to the value(s) in the table below.

   Standard resistance 

   TESTER CONNECTION CHART
   
   

   Tester Connection	Condition	Result	Proceed to
   D1-6 (CANH) - D1-14 (CANL)	Ignition switch off	54 to 69 Ω	A
   D1-6 (CANH) - D1-14 (CANL)	Ignition switch off	70 Ω or higher	B
   D1-6 (CANH) - D1-14 (CANL)	Ignition switch off	Below 54 Ω	C

   Fig 1: Identifying Terminals Of DLC3 Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

B: GO TO  "OPEN IN CAN MAIN BUS LINE "

C: GO TO  "SHORT IN CAN BUS LINES "

A: Go to Next Step 

1. Turn the ignition switch off.
2. Measure the resistance according to the value (s) in the table below.

   Standard resistance 

   TESTER CONNECTION SPECIFIED CONDITION CHART
   
   

   Tester Connection	Condition	Specified Condition
   D1-6 (CANH) - D1-4 (CG)	Ignition switch off	200 Ω or higher
   D1-14 (CANL) - D1-4 (CG)	Ignition switch off	200 Ω or higher

Fig 2: Identifying Terminals Of DLC3 Connector
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: GO TO  "SHORT TO GND IN CAN BUS LINE "

OK: Go to Next Step 

1. Disconnect the negative battery terminal.
2. Measure the resistance according to the value (s) in the table below.

   Standard resistance 

   TESTER CONNECTION SPECIFIED CONDITION CHART
   
   

   Tester Connection	Condition	Specified Condition
   D1-6 (CANH) - D1-16 (BAT)	Disconnect negative battery terminal	6 kΩ or higher
   D1-14 (CANL) - D1-16 (BAT)	Disconnect negative battery terminal	6 kΩ or higher

Fig 3: Identifying Terminals Of DLC3 Connector
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: GO TO  "SHORT TO B+ IN CAN BUS LINE "

OK: Go to Next Step 

1. Using the Techstream, select "CAN Bus Check" from "System Select".
2. Observe the screen for approximately 1 minute to check the ECUs and sensors displayed on the screen.

   Result 

   RESULT CHART
   
   

   Result	Proceed to
   All ECUs and sensors connected to the CAN communication system are displayed on the screen. (CAN bus circuit is currently normal)	A
   One of the ECUs and sensors connected to the CAN communication system is not displayed on the screen. (Open in ECU or sensor branch wires, or communication interrupted)	B(*1)
   Some ECUs and sensors repeatedly appear and disappear from the screen, during this check. (Open in one side of ECU or sensor branch wires)	C

   NOTE:

   • The systems (ECUs, sensors) that adopt CAN communication vary depending on the vehicle and optional equipment. Check which systems (ECUs, sensors) are installed on the vehicle (See DIAGNOSIS SYSTEM  ).
   • Non-installed ECUs or sensors will not be displayed. Do not mistake them for being in the communication stop mode.
   • The ECUs and sensors that repeatedly appear and disappear from the screen during this check are considered normal. (The response to Techstream and the tester display are affected by signals output from other ECUs which have an open circuit in either of their CAN branch wires.)

B: GO TO  "COMMUNICATION STOP MODE TABLE "

C: GO TO  "OPEN IN ONE SIDE OF CAN SUB BUS LINE "

A: Go to Next Step 

1. Confirm trouble according to the combination of output DTCs regarding the CAN communication system (See PROBLEM SYMPTOMS TABLE  ).

   HINT:

   Previous CAN communication system DTCs may be the cause if CAN communication system DTCs are output and all ECUs and sensors connected to the CAN communication system are displayed on Techstream's "CAN Bus Check" screen.

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