Code No. P2530: Ignition Switch-IG1 Circuit


OPERATION



  • When the ignition switch is turned on, the ignition switch ON signal is input into the engine-ECU (terminal No. 92) and also into the ETACS-ECU.

FUNCTION



  • The engine-ECU compares the ignition switch ON signal sent from the ignition switch <Vehicles without KOS> or OSS-ECU <Vehicles with KOS> with ignition switch information sent from ETACS-ECU. The engine-ECU checks for the abnormality.

TROUBLE JUDGMENT


Check Condition
  • Ignition switch: "ON" → "LOCK" (OFF)
Judgement Criterion
  • While the ignition switch ON signal is input into the engine-ECU, the ignition switch information, sent from the ETACS-ECU via CAN, is turned to OFF from ON. This allows the CAN to be stopped.
FAIL-SAFE AND BACKUP FUNCTION
  • None

PROBABLE CAUSES



  • Short circuit in ignition switch-IG1 circuit or loose connector contact
  • Failed CAN
  • Failed ETACS-ECU
  • Failed engine-ECU

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III CAN bus diagnosis

  • Use M.U.T.-III to perform CAN busline diagnosis.

Q. Is the check result normal?
Go to Step 2 .
Repair CAN busline (Refer to GROUP 54C - Troubleshooting - CAN Bus Diagnostics Table ).

STEP 2. M.U.T.-III diagnosis code

  • Confirm the diagnosis code is set from ETACS-ECU.

Q. Is diagnosis code set?
Perform troubleshooting of ETACS (Refer to GROUP 54A - ETACS - Diagnosis Code Chart ).
Go to Step 3 .

STEP 3. Connector check: B-27 engine-ECU connector

Q. Is the check result normal?
Go to Step 4 .
Repair or replace the connector.

STEP 4. Check harness between B-27 (terminal No. 92) engine-ECU connector and C-403 (terminal No. 10) ETACS-ECU connector.

  • Check signal line for short circuit.

Q. Is the check result normal?
Go to Step 5 .
Repair the damaged harness wire.

STEP 5. M.U.T.-III diagnosis code

  • Reconfirmation of diagnosis code.

Q. Is diagnosis code set?
Go to Step 6 .
Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ).

STEP 6. Replace the ETACS-ECU

  • After replacing the ETACS-ECU, reconfirm whether the diagnosis code is set.

Q. Is the diagnosis code set?
Replace the engine-ECU.
Check end.