How To Proceed With Troubleshooting [06/2016 - 03/2017]: Procedure

HINT: 

• If the ignition switch can be turned to ON when the vehicle is brought in for repair, check for DTCs and check the illumination condition of the indicators in the combination meter assembly and the basic operation of the vehicle (such as steering operation) promptly.
• Do not turn the ignition switch off until the inspection of the vehicle is finished, as some fail-safe functions are canceled when the ignition switch is turned off.
• If the ignition switch cannot be turned to ON when the vehicle is brought in, measure the voltage of the battery. If the voltage is below 11 V, recharge or replace the battery before performing troubleshooting.

Result

Result: 

NEXT 

See step  2

HINT: 

• When troubleshooting, confirm that the problem symptoms have been accurately identified. Preconceptions should be discarded in order to make an accurate judgment. To clearly understand what the problem symptoms are, it is extremely important to ask the customer about the problem and the conditions at the time the malfunction occurred.
• Ask the customer if the vehicle is/was equipped with additional devices such as a theft deterrent device or monitor. (If equipped, explain to the customer that the additional devices will be removed before performing troubleshooting as the malfunction cannot be checked properly.)

1. It is useful to confirm the symptoms and the conditions in which the vehicle was operating at the time when a malfunction occurred. This helps to narrow down the malfunctioning part.

   HINT: 

   • What was affected (system, part or meter warning indicators)
   • What happened (details of the malfunction)
   • When (occurrence date and time, frequency and if it recurs or not)
   • Under what kind of situation did the problem occur (driving and operating condition at the occurrence and weather)
   • Road type or condition (city, suburb, paved road, unpaved road, highway, etc.)
   • Return conditions (what made the vehicle return to normal. Example: ignition switch was turned off)
   POINTS TO BE CONFIRMED
   
   

   Symptom	Electric power steering Normal A little heavier than usual There was no assist Multi-information display Whether each display has stopped updating Others
   Meter warning lights	Electric power steering Slip indicator light ABS warning light Check Engine warning light Brake warning light SRS warning light Others Meter display Shift indicator Speedometer Tachometer (if it is fixed at 0 RPM) Engine coolant temperature gauge (if it is fixed at COLD)

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  3

HINT: 

Read the Techstream operator's manual before use.

Refer to GENERAL INFORMATION [06/2016 - ]

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to ON.
3. Turn the Techstream on.
4. Check that the Techstream and ECUs can communicate with the ignition switch ON.

   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 the vehicle is impossible, but communication is possible when the Techstream is connected to another vehicle, the vehicle has the malfunction. Inspect the CANH and CANL branch lines of the DLC3 and the ECU power source circuits (in this case perform steps 7 to 9 first). In addition, check that the BAT terminal of the DLC3 receives battery voltage (11 V or more).
   • 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 operator's manual. (The Techstream may be malfunctioning or its battery may be discharged.)

   Result

   Result	Proceed to
   OK (Communication between the Techstream and the vehicle is possible.)	A
   OK (Communication between the Techstream and the vehicle is impossible but communication is possible when connected to another vehicle.)	B
   NG (Communication is not possible between the Techstream and the vehicle, nor between the Techstream and another vehicle.)	C

Result: 

B 

See step  7

Result: 

C 

Refer to Techstream operator's manual 

Result: 

A 

See step  4

1. Using the Techstream, perform Health Check to read current and history DTCs and record them.
   NOTE:

   • CAN communication DTCs are output when there is an open or short in any of the communication lines. 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 ignition switch ON, the ECUs of the corresponding system and related systems store a DTC.

   HINT: 

   • 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 a CAN bus occurs, DTCs of almost all ECUs and 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 7 to 9) 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 on the Techstream.
2. Read the freeze frame data using the Techstream and record it.

   Result

   Result
   NEXT

Result: 

NEXT 

See step  5

1. Select "CAN Bus Check" from the screen on the Techstream.
2. Record all the DTCs stored for ECUs and sensors.

   Result

   Result
   NEXT

Result: 

NEXT 

See step  6

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

   Refer to DIAGNOSIS SYSTEM [06/2016 - 03/2017] 

2. Select "CAN Bus Check" from the screen on the Techstream.
3. Observe the screen for approximately 2 minutes to check the ECUs and sensors displayed on the screen.

   Result

   Result
   NEXT

Result: 

NEXT 

See step  7

HINT: 

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

1. Disconnect the cable from the negative (-) battery terminal before measuring the resistances of the CAN main wire and CAN branch wire.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Switch Condition	Specified Condition
   D10-6 (CANH) - D10-14 (CANL)	Cable disconnected from negative (-) battery terminal	57 to 63 Ω

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *1

   DLC3

   Result

   Result	Proceed to
   OK	A
   NG (64 Ω or higher)	B
   NG (Below 57 Ω)	C

Result: 

B 

GO TO OPEN IN CAN MAIN BUS LINE. Refer to  Open in CAN Main Bus Line [06/2016 - ]  

Result: 

C 

GO TO SHORT IN CAN BUS LINES. Refer to  Check CAN Bus Lines for Short Circuit [06/2016 - 03/2017]  

Result: 

A 

See step  8

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

   Standard Resistance

   Tester Connection	Switch Condition	Specified Condition
   D10-6 (CANH) - D10-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher
   D10-14 (CANL) - D10-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *1

   DLC3

   Result

   Result
   OK
   NG

Result: 

NG 

GO TO SHORT TO GND IN CAN BUS LINE. Refer to  Check CAN Bus Line for Short to GND [06/2016 - 03/2017]  

Result: 

OK 

See step  9

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

   Standard Resistance

   Tester Connection	Switch Condition	Specified Condition
   D10-6 (CANH) - D10-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher
   D10-14 (CANL) - D10-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *1

   DLC3

   Result

   Result
   OK
   NG

Result: 

NG 

GO TO SHORT TO +B IN CAN BUS LINE. Refer to  Check CAN Bus Line for Short to +B [06/2016 - 03/2017]  

Result: 

OK 

See step  10

1. Inspect or repair the probable malfunctioning part based on the check result of step 6 (the step in which CAN Bus Check was performed).

   Result of CAN Bus Check (Connection Status Check Using Techstream)

   Inspection 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 V Bus is not displayed on the screen. (Open in ECU or sensor branch lines, or communication interrupted.)	B
   In addition to the ECUs and sensors which are connected to the CAN communication system but are not displayed on the screen, there are ECUs or sensors for which the detection status changes (changes between detected and not detected) during the inspection. (Open in one side of ECU or sensor branch lines.)	C

   NOTE:

   • Non-installed ECUs or sensors will not be displayed. Do not mistake them for being in communication stop mode.
   • It may be possible to select buses that do not have ECUs or sensors from the bus selection pull-down menu on the Techstream. This is not a malfunction.

   HINT: 

   • Regarding CAN Bus Check, refer to How to Interpret CAN Bus Diagnosis (CAN Bus Check) Screen.

     Refer to DIAGNOSIS SYSTEM [06/2016 - 03/2017] 

   • If the detection status of ECUs changes during the inspection, one of the branch lines of a connected ECU or sensor may be open. (Signals from the ECU or sensor that has an open in one of its branch lines create electrical noise, affecting response to the Techstream and the ECUs and whether or not sensors displayed.)

Result: 

B 

GO TO COMMUNICATION STOP MODE TABLE. Refer to  PROBLEM SYMPTOMS TABLE [06/2016 - 03/2017]  

Result: 

C 

GO TO OPEN IN ONE SIDE OF CAN BRANCH LINE. Refer to  Open in One Side of CAN Branch Line [06/2016 - 03/2017]  

Result: 

A 

See step  11

1. Inspect or repair the probable malfunctioning part based on the check result of step 5 (the step in which checking for communication malfunction DTCs was performed).

   HINT: 

   • When checking for communication DTCs, refer to How to Interpret Communication DTCs (DTCs that start with U).

     Refer to DIAGNOSIS SYSTEM [06/2016 - 03/2017] 

   • If communication DTCs are stored, and all ECUs and sensors connected to the CAN communication system are displayed on the Communication Bus Check (CAN bus check) screen of the Techstream, a past malfunction that is currently not occurring is suspected.
   • When a CAN branch of the V bus is malfunctioning, because the ECUs and sensors related to it detect the malfunction, the problem area can be determined using the combination of DTCs that are output.

   Result

   Result
   NEXT

Result: 

NEXT 

See step  12

1. Confirm the problem according to the combination of output DTCs regarding the CAN communication system.

   Refer to DIAGNOSIS SYSTEM [06/2016 - 03/2017] 

   Result

   Inspection Result	Proceed to
   Combination of DTCs is not in DTC Combination Table	A
   Combination of DTCs is in DTC Combination Table	B

   HINT: 

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

Result: 

B 

GO TO COMMUNICATION STOP MODE TABLE. Refer to  PROBLEM SYMPTOMS TABLE [06/2016 - 03/2017]  

Result: 

A 

See step  13

1. Connect the cable to the negative (-) battery terminal.
2. Clear the DTCs using the Techstream.
3. Perform the tests in Symptom Simulation to check the wire harnesses and connectors including those for V bus main bus lines.

   Refer to HOW TO PROCEED WITH TROUBLESHOOTING [06/2016 - 03/2017]

4. Based on the results of the check, inspect the parts that output DTCs to determine the malfunctioning part.

   HINT: 

   If DTCs are output, do not turn the ignition switch off.

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  14

Result

Result: 

NEXT 

See step  15

Result

Result: 

NEXT 

END