Code No. P2530: Ignition Switch-IG1 Circuit

caution

When the ETACS-ECU of vehicles without KOS is replaced, the encrypted code of the ignition key needs to be registered to the ETACS-ECU. (If the encrypted code is not registered, the engine cannot be started. Register the encrypted code as described in GROUP 54A, Immobilizer System - How to Register Key ID .)

OPERATION

When the ignition switch is turned on, the ignition switch ON signal is input into the engine-ECU connector terminal IGN 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 bus line diagnosis.

Q. Is the check result normal?

	Go to Step 2.

	Repair CAN bus line (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. Check harness between engine-ECU connector terminal IGN and ETACS-ECU connector terminal IGN.

Check signal line for short circuit.

Q. Is the check result normal?

	Go to Step 4.

	Repair or replace the connector, or repair the damaged harness wire.

STEP 4. M.U.T.-III diagnosis code

Reconfirmation of diagnosis code.

Q. Is diagnosis code set?

	Go to Step 5.

	Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ).

STEP 5. 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.