LAN System (Diagnostics)

List of Diagnostic Trouble Code (DTC)









1. CHECK USING THE DTC CHECK SHEET

DTC check sheet






1. Module installation check
1. Write "-" marks in the field for INSTALLATION Check if the vehicle to be inspected does not have relevant module.
2. Write "-" marks in all blank fields on the same row that the "-" mark has filled in.

2. Buss off detection / data not received

NOTE: It becomes impossible for CAN diagnostic module to read DTC, if there is a current malfunction of open harness (data not received). If this occurs, perform the "Check using the check sheet of communication for initializing" Scan Tool Testing and Procedures, and use this sheet to confirm that the corresponding part becomes the past malfunction.

1. Mark "X" in the field corresponding to the DTCs that has been detected by each module in the check sheet.
2. Identify and repair the faulty part by referring to the example of DTC data not received and the DTC matrix.

3. Data abnormal detection

NOTE: If the buss off occurs or data is not received, perform the diagnosis for these problems first.

1. If several modules detect the DTC for the same module, replace the detected module.
2. If one module detects the DTC, replace the module of the detected side.
3. If it does not return to the normal operation, re-install the module which has been replaced, and replace the module of the detected side.
4. If it does not return to the normal operation, replace both modules.

2. EXAMPLE OF DTC DATA NOT RECEIVED






When (7) (ECM vicinity) is open

NOTE: If bus off occurs, ECM displays only the DTC that indicates bus off.






When (13) (STR vicinity) is open






When (14) (TCM vicinity) is open






When (16) (EPS vicinity) is open

NOTE: Power steering CM may display U1120 (AUTO START STOP COMMUNICATION LOST).






3. DTC MATRIX

NOTE: Perform the following procedure when using this chart in which the detailed trouble mode corresponds to the trouble status.

1. Search the trouble mode that corresponds to the vehicle status from the chart.
2. Perform the repair that corresponds to the trouble mode.






1. Hi-side circuit of CAN communication circuit is open.

NOTE:
- If the module has a limit of DTC memory and the number of DTC occurrence exceeds the limit, older DTCs are preferentially stored.
- When there is no description in Current, it is referred to as "None".
- When DTCs is in parentheses, it is referred to as "Not always occur".
- "Trouble exists" is referred to as the status before performing inspection and repair. "Trouble existed" is referred to as the status before performing DTC clear after repair.
























2. Lo-side circuit of CAN communication circuit is open.

NOTE:
- If the module has a limit of DTC memory and the number of DTC occurrence exceeds the limit, older DTCs are preferentially stored.
- When there is no description in Current, it is referred to as "None".
- When DTCs is in parentheses, it is referred to as "Not always occur".
- "Trouble exists" is referred to as the status before performing inspection and repair. "Trouble existed" is referred to as the status before performing DTC clear after repair.
























3. Hi/Lo-side circuit of CAN communication circuit is open.

NOTE:
- If the module has a limit of DTC memory and the number of DTC occurrence exceeds the limit, older DTCs are preferentially stored.
- When there is no description in Current, it is referred to as "None".
- When DTCs is in parentheses, it is referred to as "Not always occur".
- "Trouble exists" is referred to as the status before performing inspection and repair. "Trouble existed" is referred to as the status before performing DTC clear after repair.
























4. Power supply-output short, GND-output short and short circuit in CAN communication circuit

NOTE:
- If the module has a limit of DTC memory and the number of DTC occurrence exceeds the limit, older DTCs are preferentially stored.
- When there is no description in Current, it is referred to as "None".
- When DTCs is in parentheses, it is referred to as "Not always occur".
- "Trouble exists" is referred to as the status before performing inspection and repair. "Trouble existed" is referred to as the status before performing DTC clear after repair.