FAILURE DIAGNOSIS
1-126
TNV DI Service Manual
DTCs (Diagnostic Trouble Codes) General Description
CAN Communication
(1) U0001/12: CAN Communication Error
DTC Detecting Conditions
Movement at Error occurrence
Estimation of Failure cause/Error condition
• Deactivation of another ECU
• Battery voltage descent
• The connector may not be properly connected.
• Wiring defect of the harness
•
CAN communication line (Hi, Low) may be disconnected, or short-circuited with GND or power supply.
• The E-ECU internal circuitry may be faulty.
DTC
U0001/12
CAN Communication Error
1 - Precondition; 2 - Detecting condition(s); 3 - Flashing pattern of failure indicator
Check points
1. (1) Before and (2) after ECU start-up
2. A necessary CANID cannot be received that should periodically received.
3. One flash followed by two flashes.
Other ECUs
Battery
Connector
Harness
E-ECU
Accelerator sensor function
CAN communication only
CAN communication plus analog input or
pulse accelerator#
Error Mode
[Run Under Restrictions]:
The engine runs at a constant rotational
speed.
[Run As Is]:
The engine continues to run using the
analog input or pulse accelerator instead.
Run restricted?
Yes: The target speed is set to the "on-
error target speed (standard value:
1500[min
-1
])" or “pre-error target
speed”.
No.
Recovery
Conditions
Yes: The error is reset when the
necessary data is received.
Yes: The error is reset when the
necessary data is received.
Remarks
When the error is reset, then the engine
switches to CAN communication mode
and continues to run.
TNV_DI_SM_A4-Troubleshooting.book 126 ページ ２００７年１１月１５日 木曜日 午後５時２７分
