Toyota Yaris: Can Communication System / How To Proceed With Troubleshooting

NOTICE:

• Because the order of diagnosis is important to allow correct diagnosis, make sure to begin troubleshooting using How to Proceed with Troubleshooting when CAN communication system related DTCs are output.
• If the CAN communication system is malfunctioning, check the contact pressure of the terminals in connectors, as insufficient terminal contact pressure may be the cause.

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• Before measuring the resistance of the CAN bus, turn the ignition switch off and leave the vehicle for 1 minute or more without operating the key or any switches, or opening or closing the doors. After that, disconnect the cable from the negative (-) auxiliary battery terminal and leave the vehicle for 1 minute or more before measuring the resistance.
• After turning the ignition switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal.

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• When disconnecting and reconnecting the auxiliary battery, there is an automatic learning function that completes learning when the respective system is used.

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• Some parts must be initialized and set when replacing or removing and installing parts.

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HINT:

• If the ignition switch can be turned to ON (the power source mode can be changed 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 (the power source mode cannot be changed to on) even though the battery voltage is normal, repair this malfunction before performing troubleshooting.

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• When the ignition switch cannot be turned to ON, data can be read from ECUs that can communicate with the ignition switch off by connecting the GTS to the vehicle and turning a courtesy light switch on and off at intervals of 1.5 seconds or less until communication starts.

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.)
• Examples of points to be confirmed are shown below.

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.)
• Conditions when vehicle returned to normal (ignition switch was turned off, etc.)

HINT:

• ECUs and sensors are not displayed on the "Communication Bus Check" screen when the GTS cannot communicate with the vehicle.
• If communication between the GTS and ECUs is not possible, either the GTS or vehicle has a malfunction.
• If communication between the GTS and ECUs is still not possible even when the GTS is connected to another vehicle, the GTS has a malfunction. Perform the self tests described in the GTS operator's manual. (The GTS may be malfunctioning or its battery may be discharged.)

NOTICE:

• A sub bus monitoring ECU outputs DTCs for its respective ECUs and sensors. Identify the malfunctioning ECU or sensor using the output DTCs.
• ECUs or sensors that are not installed to the vehicle will not be displayed. Do not mistake these for ECUs or sensors that are not communicating.
• When using the combo box, it may be possible to select a sub bus from the drop down list that does not have any connected ECUs or sensors. This is not a malfunction and occurs when there is no optional device connected to a sub bus which is monitored by a sub bus monitoring ECU (gateway function equipped ECU).

HINT:

• For details on how to read the "Communication Bus Check" screen, refer to Description of "Communication Bus Check" screen.

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• If there is an ECU or sensor whose connection status changes intermittently while checking the "Communication Bus Check" screen, there may be an open circuit in one of the wires of a branch line of an ECU or sensor in the bus. If an open occurs in one of the wires of a CAN branch line, it may interfere with the communication of other ECUs or sensors resulting in an incorrect state being displayed.
• The central gateway ECU (network gateway ECU) displays the connection status of ECUs and sensors connected to the central bus on the GTS.
• Sub bus monitoring ECUs display the connection status of ECUs and sensors connected to their respective sub bus on the GTS.
• If a CAN commutation DTC is output for an ECU connected to the sub bus, refer to the corresponding diagnostic procedure.

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NOTICE:

• 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 or sensor itself also cause these DTCs to be output.
• If a CAN communication line connector is disconnected with the ignition switch ON or ACC, the ECUs of the corresponding system and related systems store a DTC.

HINT:

• For details on the terminal arrangement of the central gateway ECU (network gateway ECU), refer to Terminals of ECU.

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• If the CAN bus main line is normal and there is an ECU or sensor whose connection status changes intermittently while checking the "Communication Bus Check" screen, there may be an open circuit in one of the wires of a branch line of an ECU or sensor in the bus. If an open occurs in one of the wires of a CAN branch line, it may interfere with the communication of other ECUs or sensors resulting in an incorrect state being displayed.

  Performing the bus inspection again may help in determining the suspected area.

System Description

SYSTEM DESCRIPTION BRIEF DESCRIPTION (a) The Controller Area Network (CAN) is a serial data communication system for real time application. It is a vehicle multiplex communication system which has a high communication speed and the ability to detect malfunctions...

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