DTC Description
CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle multiplex communication line with high data communication speed and excellent error detection ability. Many electronic control units are equipped onto a vehicle, and each control unit shares information and links with other control units during operation (not independent). In CAN communication, control units are connected with 2 communication lines (CAN-High line, CAN-Low line) allowing a high rate of information transmission with less wiring. Each control unit communicate data but selectively reads required data only.
DTC DETECTION LOGIC
| DTC No. | CONSULT screen terms(Trouble diagnosis content) | DTC detected condition | |
|---|---|---|---|
| U1000 | CAN COMM CIRCUIT(CAN communication circuit) | Diagnosis condition | When ignition switch is ON. |
| Signal (terminal) | CAN communication signal | ||
| Threshold | Malfunction of CAN communication signal | ||
| Diagnosis delay time | 2 seconds or more | ||
POSSIBLE CAUSE
CAN communication error
FAIL-SAFE
Constant steering state
DTC CONFIRMATION PROCEDURE
- PRECONDITIONING
- If "DTC CONFIRMATION PROCEDURE" has been previously conducted, always place ignition switch OFF and wait at least 10 seconds before conducting the next test.
>>
GO TO 2.
- DTC REPRODUCTION PROCEDURE
CONSULT
- Ignition switch ON.
- Select "Self Diagnostic Result" mode of "EPS/DAST 3".
Is DTC "U1000" detected?
YES>>
Proceed to diagnosis procedure. Refer to DTC Diagnosis Procedure .
NO>>
To check malfunction symptom before repair: Refer to Intermittent Incident .
NO>>
Confirmation after repair: Inspection End.