P0513

DTC P0513: Immobilizer Malfunction

Immobilizer Circuit:

TECHNICAL DESCRIPTION
- ECM monitors the communication condition with the immobilizer-ECU. When an abnormality in communication is found, ECM prevents engine start.

DTC SET CONDITIONS

Check Condition
- Ignition switch: ON

Judgment Criterion
- When the communication error between ECM and the immobilizer-ECU continues for 2 seconds or more.

TROUBLESHOOTING HINTS (The most likely causes for this code to be set are:)
- Malfunction of harness or connector.
- Malfunction of immobilizer-ECU.
- Malfunction of ECM.

DIAGNOSIS

Required Special Tools:
- MB991958: Scan Tool (M.U.T.-III Sub Assembly)
- MB991824: V.C.I.
- MB991827: USB Cable
- MB991911: Main Harness B

STEP 1. Using scan tool MB991958, read the immobilizer diagnostic trouble code (DTC).

CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.




1. Connect scan tool MB991958 to the data link connector.
2. Turn the ignition switch to the "ON" position.
3. Read the immobilizer system-DTC.
4. Turn the ignition switch to the "LOCK" (OFF) position.

Q: Is the immobilizer system - DTC is output?

YES: Refer to Ignition Switch and Immobilizer System - Diagnostic Trouble Code Chart in Antitheft And Alarm System/Testing And Inspection/Trouble Code Descriptions

NO: Go to Step 2.




STEP 2. Check harness connector C-117 at ECM for damage.

Q: Is the connector in good condition?

YES: Go to Step 3.

NO: Repair or replace it. Then confirm that the malfunction symptom is eliminated.




STEP 3. Check harness connector C-22 at immobilizer-ECU for damage.

Q: Is the harness connector in good condition?

YES: Go to Step 4.

NO: Repair or replace it. Then confirm that the malfunction symptom is eliminated.







STEP 4. Check for open circuit and short circuit to ground and harness damage between ECM connector C-117 (terminal No.98) and immobilizer-ECU connector C-22 (terminal No.5).

NOTE: Check harness connector after checking intermediate connector C-124. If the intermediate connector is damaged, repair or replace it. Then confirm that the malfunction symptom is eliminated.

Q: Is the harness wire in good condition?

YES: If DTC P0513 is output again after the MFI-DTC has been erased, replace the ECM. Then check that the DTC P0513 does not reset.

NO: Repair it. Then confirm that the malfunction symptom is eliminated.