How To Proceed With Troubleshooting

Standard voltage

11 to 14 V

HINT: 

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

NEXT: Go to next step 

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, the ECUs of the corresponding system and related systems record a DTC.

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1. Based on the vehicle equipment and specifications, confirm the systems that use CAN communication. Refer to DIAGNOSIS SYSTEM .

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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.
   Fig 1: Checking DLC3 E15 Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   TEXT IN ILLUSTRATION
   
   

   *1

   DLC3

   Standard Resistance

   Tester Connection	Switch Condition	Result	Proceed to
   E15-6 (CANH) - E15-14 (CANL)	Ignition switch off	54 to 69 Ω	A
   E15-6 (CANH) - E15-14 (CANL)	Ignition switch off	70 Ω or higher	B
   E15-6 (CANH) - E15-14 (CANL)	Ignition switch off	Below 54 Ω	C

   B → GO TO "OPEN IN CAN MAIN BUS LINE". Refer to  Open in CAN Main Bus Line  

   C → GO TO "CHECK CAN BUS LINES FOR SHORT CIRCUIT". Refer to  Check CAN Bus Lines for Short Circuit  

   A: Go to next step 

1. Turn the ignition switch off.
2. Measure the resistance according to the value(s) in the table below.
   Fig 2: Checking DLC3 E15 Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   TEXT IN ILLUSTRATION
   
   

   *1

   DLC3

   Standard resistance

   Tester Connection	Switch Condition	Specified Condition
   E15-6 (CANH) - E15-4 (CG)	Ignition switch off	200 Ω or higher
   E15-14 (CANL) - E15-4 (CG)	Ignition switch off	200 Ω or higher

   NG → GO TO "CHECK CAN BUS LINE FOR SHORT TO GND". Refer to  Check CAN Bus Line for Short to GND  

   OK: Go to next step 

1. Disconnect the cable from the negative (-) battery terminal.
2. Measure the resistance according to the value(s) in the table below.
   Fig 3: Checking DLC3 E15 Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   TEXT IN ILLUSTRATION
   
   

   *1

   DLC3

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   E15-6 (CANH) - E15-16 (BAT)	Cable is disconnected from negative (-) battery terminal	6 kΩ or higher
   E15-14 (CANL) - E15-16 (BAT)	Cable is disconnected from negative (-) battery terminal	6 kΩ or higher

   NG → GO TO "CHECK CAN BUS LINE FOR SHORT TO +B". Refer to  Check CAN Bus Line for Short to +B  

   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	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. Refer to 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 the Techstream 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. Refer to  PROBLEM SYMPTOMS TABLE  

   C → GO TO OPEN IN ONE SIDE OF CAN BRANCH WIRE. Refer to  Open in One Side of CAN Branch Line  

   A: Go to next step 

1. Confirm a trouble according to the combination of output DTCs regarding the CAN communication system. Refer to DIAGNOSIS SYSTEM .

   HINT: 

   CAN communication system history DTCs may be caused if CAN communication system DTCs are output and all ECUs and sensors connected to the CAN communication system are displayed on the "CAN Bus Check" screen of the Techstream.

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