HINT
If a CAN communication malfunction DTC and a related sensor malfunction DTC are output at the same time, the CAN
communication malfunction must be repaired before troubleshooting the sensor malfunction DTC.
B -- USE SIMULATION METHOD TO CHECK See: Accessories and Optional Equipment/Antitheft and Alarm
Systems/Diagrams/Diagnostic Aids/How To Troubleshoot ECU Controlled Systems/How To Proceed With Troubleshooting
A -- GO TO CAN COMMUNICATION SYSTEM See: Powertrain Management/Computers and Control Systems/Information
Bus/Testing and Inspection/Initial Inspection and Diagnostic Overview/CAN Communication System/How to Proceed With
Troubleshooting
Up to 08/2009
NETWORKING: CAN COMMUNICATION SYSTEM: U0104: Lost Communication with Driving Support ECU
U0104 - Lost Communication with Driving Support ECU
DESCRIPTION
WIRING DIAGRAM
INSPECTION PROCEDURE
NOTICE:
* Turn the engine switch off before measuring the resistances between CAN bus main wires and between CAN bus branch
wires.
* Turn the engine switch off before inspecting CAN bus wires for a ground short.
* After the engine switch is turned off, check that the key reminder warning system and light reminder warning system are not
operating.
* Before measuring the resistance, leave the vehicle as is for at least 1 minute and do not operate the engine switch, any other
switches or the doors. If any doors need to be opened in order to check connectors, open the doors and leave them open.
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.
* 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.
PROCEDURE
1. RECONFIRM DTC OUTPUT
(a) Reconfirm DTCs.
HINT
If CAN No. 2 bus DTC U1002 is output from the power the management control ECU (Techstream display/Power Management1),
troubleshoot for U1002 and check for malfunctions in the CAN No. 2 main bus circuit.
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