How To Proceed With Troubleshooting [08/2014 - ]: Procedure

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Result:  1

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1. Interview the customer and confirm the problem.

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Result:  1

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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.

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Result:  1

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HINT: 

• CAN communication DTCs are stored 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 or the sensor itself also cause these DTCs to be stored.
• If a CAN communication wire connector is disconnected with the power switch on (IG), the ECUs of the corresponding system and related systems store a DTC.

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Result:  1

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See step  5

HINT: 

• Operating the power 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.
• 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. Turn the power switch off.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

   Standard Resistance

   Tester Connection	Switch Condition	Specified Condition
   H44-6 (CANH) - H44-14 (CANL)	Power switch off	54 to 69 Ω

   TEXT IN ILLUSTRATION
   
   

   *1

   DLC3

   Result

   Result	Proceed to
   OK	A
   NG (70 Ω or higher)	B
   NG (Below 54 Ω)	C

Result:  2

B 

GO TO OPEN IN CAN MAIN BUS LINE 

(See article. Refer to Open in CAN Main Bus Line [08/2014 - ] )

Result:  3

C 

GO TO SHORT IN CAN BUS LINES 

(See article. Refer to Check CAN Bus Lines for Short Circuit [08/2014 - ] )

Result:  1

A 

See step  6

1. Turn the power switch off.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

   Standard Resistance

   Tester Connection	Switch Condition	Specified Condition
   H44-6 (CANH) - H44-4 (CG)	Power switch off	200 Ω or higher
   H44-14 (CANL) - H44-4 (CG)	Power switch off	200 Ω or higher

   TEXT IN ILLUSTRATION
   
   

   *1

   DLC3

   Result

   Result	Proceed to
   OK	A
   NG	B

Result:  2

B 

GO TO SHORT TO GND IN CAN BUS LINE 

(See article. Refer to Check CAN Bus Line for Short to GND [08/2014 - ] )

Result:  1

A 

See step  7

1. Disconnect the cable from the negative (-) battery terminal.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   H44-6 (CANH) - H44-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher
   H44-14 (CANL) - H44-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher

   TEXT IN ILLUSTRATION
   
   

   *1

   DLC3

   Result

   Result	Proceed to
   OK	A
   NG	B

Result:  2

B 

GO TO SHORT TO +B IN CAN BUS LINE. Refer to  Check CAN Bus Line for Short to +B [08/2014 - ] 

Result:  1

A 

See step  8

1. Based on the vehicle equipment and specifications, confirm the systems that use CAN communication (See article. Refer to DIAGNOSIS SYSTEM [08/2014 - 08/2015] Refer to DIAGNOSIS SYSTEM [08/2015 - ] ).

   Result

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Result:  1

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See step  9

1. Select "CAN Bus Check" from the screen on the Techstream (See article. Refer to DIAGNOSIS SYSTEM [08/2014 - 08/2015] Refer to DIAGNOSIS SYSTEM [08/2015 - ] ).
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
   All ECUs except the power management control ECU connected to the V2 bus are not displayed on the screen. The power management control ECU (PM1 Gateway) outputs DTC U1002. (Open or short in V2 bus main lines.)	B
   All ECUs except the power management control ECU connected to the power management bus are not displayed on the screen. The power management control ECU (PM2 Gateway) outputs DTC U1002. (Open or short in power management bus main lines.)	C
   All ECUs except the main body ECU connected to the CAN MS bus are not displayed on the screen. The main body ECU (Main Body) outputs DTC U1002. (Open or short in CAN MS bus main lines.)	D
   All ECUs connected to the CAN MS bus are not displayed on the screen. (Open in main body ECU branch line or main body ECU malfunction.)	E
   All ECUs connected to the V2 bus and power management bus are not displayed on the screen. (Open in power management control ECU branch lines or power management control ECU malfunction.)	F
   One of the ECUs and sensors connected to the V1 bus is not displayed on the screen. (Open in ECU or sensor branch lines, or communication interrupted.)	G
   One of the ECUs and sensors connected to the V2 bus or power management bus is not displayed on the screen. (Open in ECU or sensor branch lines, or communication interrupted.) One of the ECUs and sensors connected to the CAN MS bus is not displayed on the screen. (Open in ECU or sensor branch lines, or communication interrupted.)	H
   Some ECUs and sensors repeatedly appear and disappear on the screen during this check. (Open in one side of ECU or sensor branch lines.)	I

   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 (See article. Refer to DIAGNOSIS SYSTEM [08/2014 - 08/2015] Refer to DIAGNOSIS SYSTEM [08/2015 - ] ).
   • Non-installed ECUs or sensors will not be displayed. Do not mistake them for being in 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 and its display are affected by signals output from other ECUs which have an open circuit in either of their CAN bus branch lines.)

   HINT: 

   • The ECUs connected to the V2 bus and power management bus are displayed on the screen by the power management control ECU.
   • The ECUs connected to the CAN MS bus are displayed on the screen by the main body ECU.

Result:  2

B 

GO TO U1002 (Power Management1) 

(See article. Refer to DTC U1002: Lost Communication with Gateway Module (Power Management1) [08/2014 - ] )

Result:  9

C 

GO TO U1002 (Power Management2) 

(See article. Refer to DTC U1002: Lost Communication with Gateway Module (Power Management2) [08/2014 - ] )

Result:  3

D 

GO TO U1002 (Main Body). Refer to  DTC U1002: Lost Communication with Gateway Module (Main Body) [08/2014 - ] 

Result:  4

E 

GO TO MAIN BODY ECU COMMUNICATION STOP MODE 

(See article. Refer to Main Body ECU Communication Stop Mode [08/2014 - ] )

Result:  5

F 

GO TO POWER MANAGEMENT CONTROL ECU COMMUNICATION STOP MODE 

(See article. Refer to Power Management Control ECU Communication Stop Mode [08/2014 - ] )

Result:  6

G 

GO TO COMMUNICATION STOP MODE TABLE. Refer to  PROBLEM SYMPTOMS TABLE [08/2014 - ]  

Result:  7

H 

GO TO DIAGNOSTIC TROUBLE CODE CHART. Refer to  DIAGNOSTIC TROUBLE CODE CHART [08/2014 - ]  

Result:  8

I 

GO TO OPEN IN ONE SIDE OF CAN BRANCH LINE. Refer to  Open in One Side of CAN Branch Line [08/2014 - ] 

Result:  1

A 

See step  10

HINT: 

• Sometimes CAN communication system DTCs are output, but all 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 DTC Combination Table for the CAN bus.
• The power management control ECU will store communication error DTCs when the ECUs connected to the V2 bus and power management bus cannot communicate, or if a network malfunction occurs.
• The main body ECU will store communication error DTCs when the ECUs connected to the CAN MS bus cannot communicate, or if a network malfunction occurs.
• The driving support ECU will store communication error DTCs when the ECUs connected to the sensor bus cannot communicate, or if a network malfunction occurs.

Result

Result:  2

B 

GO TO U1002 (Power Management1) 

(See article. Refer to DTC U1002: Lost Communication with Gateway Module (Power Management1) [08/2014 - ] )

Result:  8

C 

GO TO U1002 (Power Management2) 

(See article. Refer to DTC U1002: Lost Communication with Gateway Module (Power Management2) [08/2014 - ] )

Result:  4

D 

GO TO U1002 (Main Body). Refer to  DTC U1002: Lost Communication with Gateway Module (Main Body) [08/2014 - ] 

Result:  5

E 

GO TO U1002 (Sensor Bus). Refer to  DTC U1002: Lost Communication with Gateway Module (Sensor Bus); DTC U0235: Lost Communication with Cruise Control Front Distance Range Sensor [08/2014 - ] 

Result:  6

F 

GO TO DIAGNOSTIC TROUBLE CODE CHART 

(See article. Refer to DIAGNOSTIC TROUBLE CODE CHART [08/2014 - ] )

Result:  7

G 

GO TO DIAGNOSTIC TROUBLE CODE CHART. Refer to  DIAGNOSTIC TROUBLE CODE CHART [08/2014 - ]  

Result:  1

A 

See step  11

1. Confirm the problem according to the combination of output DTCs regarding the CAN communication system (See article. Refer to DIAGNOSIS SYSTEM [08/2014 - 08/2015] Refer to DIAGNOSIS SYSTEM [08/2015 - ] ).

   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.

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Result:  1

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Result:  1

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Result:  1

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Result:  1

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Result:  1

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END