Code No. 25: Open Circuit in the K-LINE


caution
  • If diagnosis code No.25 is set in the CAN adapter, diagnose the CAN main bus line.
  • Whenever the ECU is replaced, ensure that the communication circuit is normal.


TROUBLE JUDGMENT



COMMENT ON TROUBLE SYMPTOM



PROBABLE CAUSES



  • Malfunction of the CAN adapter
  • Damaged harness wires and connectors
  • Malfunction of the CAN bus

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III CAN bus diagnostics
Use the M.U.T.-III to diagnose the CAN bus lines.

Q. Is the check result normal?
Go to Step 2.
Repair the CAN bus line (Refer to GROUP 54C - Troubleshooting ). On completion, go to Step 2.

STEP 2. Connector check: RV meter connector C-109 and CAN adapter connector C-110



Q. Is the check result normal?

Go to Step 3.

Repair the defective connector.

STEP 3. Check the harness wires between RV meter connector C-109 (terminal 15) and CAN adapter connector C-110 (terminal 8).



Q. Is the check result normal?

Go to Step 4.

Repair the wiring harness.

STEP 4. Check whether the diagnosis code is reset.
Check again if the diagnosis code is set.
(1)Erase the diagnosis code.
(2)Turn the ignition switch from "LOCK" (OFF) position to "ON" position.
(3)On completion, check that the diagnosis code is not reset.

Q. Is the check result normal?
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to use Troubleshooting/inspection Service Points - How to Cope with Intermittent Malfunction ).
Replace the CAN adapter, go to Step 5.

STEP 5. Check whether the diagnosis code is reset.
Recheck if the diagnosis code is set.
(1)Erase the diagnosis code.
(2)Turn the ignition switch from "LOCK" (OFF) position to "ON" position.
(3)On completion, check that the diagnosis code is not reset.

Q. Is the check result normal?
The procedure is complete.
Return to Step 1.