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 to the next step.

NEXT: Go to next step 

1. Check that the engine switch can be turned on (IG) (vehicle power source system can change to on (IG)).
2. If the engine switch cannot be turned on (IG), repair this malfunction first.

   2GR-FSE: Refer to PROBLEM SYMPTOMS TABLE

   4GR-FSE: Refer to PROBLEM SYMPTOMS TABLE

   HINT: 

   Even if the engine switch cannot be turned on (IG) (when the vehicle power source system cannot change to on (IG), the data of some ECUs can be checked even with the engine switch off. These ECUs can be checked by connecting the Techstream to the vehicle and turning a door courtesy switch on and off repeatedly to start communication (the on/off operation interval should be less than 1.5 seconds).

   2GR-FSE: Refer to Power Source Mode does not Change to ON (IG and ACC)

   4GR-FSE: Refer to Power Source Mode does not Change to ON (IG and ACC)

   NEXT: Go to next step 

HINT: 

Read the Techstream operators manual before use. Refer to GENERAL INFORMATION .

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG).
3. Turn the Techstream on.
4. Check that the Techstream and ECUs can communicate with the engine switch on (IG).

   HINT: 

   • If communication is impossible, the Techstream screen will indicate an error.
   • If communication between the Techstream and ECUs is impossible, either the Techstream or vehicle has a malfunction.
   • When communication between the Techstream and ECUs is impossible, but communication is normal when the Techstream is connected to another vehicle, the vehicle has the malfunction. Inspect the diagnosis data link line, CANH, CANL and power source circuits of ECUs (in this case perform steps 6 to 8 first). In addition, check that the BAT terminal of the DLC3 receives a battery voltage of 11 V or more when the engine switch is on (IG).
   • If communication between the Techstream and ECUs is still impossible even when the Techstream is connected to another vehicle, the Techstream has a malfunction. Perform the self tests described in the Techstream operators manual. (The Techstream may be malfunctioning or its battery may be discharged.)

   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 line connector is disconnected with the engine switch on (IG), the ECUs of the corresponding system and related systems store a DTC.
• If an open in a CAN main bus line, a short between the CAN bus lines (CANH and CANL) or a +B or ground short in the CAN bus occurs, DTCs of almost all ECUs (or sensors) on the CAN bus may be output, or a message indicating a communication error may be displayed on the Techstream screen. In this case, check the resistance of the CAN bus (steps 6 to 8) first.
• If an open occurs in just one of the lines of a CAN branch, DTCs which are not related to malfunctioning parts may be output (DTCs may be displayed randomly), or a message indicating a communication error may be displayed.

1. Check for DTCs and freeze frame date using the Techstream and record them.
2. Clear the DTCs using the Techstream.

   HINT: 

   If DTCs cannot be cleared, perform the following procedure.

3. Turn the engine switch off and wait at least 15 seconds.
4. Turn the engine switch on (IG) again.
5. Clear the DTCs using the Techstream.

   NEXT: Go to next step 

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

   NEXT: Go to next step 

HINT: 

Operating the engine 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 engine switch off.
2. Measure the resistance according to the value(s) in the table below.
   Fig 1: Identifying DLC3 Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Resistance

   Tester Connection	Condition	Specified Condition	Proceed to
   J21-6 (CANH) - J21-14 (CANL)	Engine switch off	54 to 69 Ω	A
   J21-6 (CANH) - J21-14 (CANL)	Engine switch off	70 Ω or higher	B
   J21-6 (CANH) - J21-14 (CANL)	Engine 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 "SHORT IN CAN BUS LINES". Refer to  Short in CAN Bus Lines  

   A: Go to next step 

1. Turn the engine switch off.
2. Measure the resistance according to the value(s) in the table below.
   Fig 2: Identifying DLC3 Connector Terminal CG

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   J21-6 (CANH) - J21-4 (CG)	Engine switch off	200 Ω or more
   J21-14 (CANL) - J21-4 (CG)	Engine switch off	200 Ω or more

   NG → GO TO "SHORT TO GND IN CAN BUS LINE". Refer to  Short to GND in CAN Bus Line  

   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: Identifying DLC3 Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   J21-6 (CANH) - J21-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or more
   J21-14 (CANL) - J21-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or more

   NG → GO TO "SHORT TO +B IN CAN BUS LINE". Refer to  Short to B+ in CAN Bus Line  

   OK: Go to next step 

1. Check which of the following are adopted: navigation system and 4WD.

   NEXT: Go to next step 

1. Connect the cable to the negative (-) battery terminal.
2. Turn the engine switch on (IG).
3. Using the Techstream, select "CAN Bus Check" from "System Select".

   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 lines, or communication interrupted)	B
   Multiple ECUs or sensors which are connected to the CAN communication system are not displayed. (Open in one of the branch lines to an ECU or sensor)	C

   NOTE:

   • The systems (ECUs and sensors) that adopt CAN communication vary depending on the vehicle and optional equipment. Check which systems (ECUs and sensors) are installed on the vehicle.
   • Non-installed ECUs or sensors are not displayed. Do not mistake them for being in communication stop mode.
   • The systems displayed on the Techstream display are affected by signals output from other ECUs which have an open circuit in either of their CAN branch lines.

   B → GO TO "COMMUNICATION STOP MODE TABLE". Refer to  PROBLEM SYMPTOMS TABLE  

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

   A: Go to next step 

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

   HINT: 

   • Sometimes CAN communication system DTCs are output, but all the ECUs and sensors connected to the CAN communication system are displayed on the Techstream. In this case, previous or history DTCs may indicate the cause of the problem.
   • ECUs related to a problem in the CAN bus will store DTCs to indicate communication malfunctions. Communication stop mode in the CAN bus can be determined by comparing the combination of DTCs that have been set. Refer to the DTC combination table for the CAN bus.

   NEXT: Go to next step 

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