P1610

Immobilizer Malfunction

TECHNICAL DESCRIPTION
- ECM or PCM monitors the communication condition with the immobilizer-ECU and the message from the immobilizer- ECU, and when the abnormality is found, ECM or PCM makes the engine not to start.

DTC SET CONDITIONS

Check Conditions
- Ignition switch: ON

Judgment Criteria
- When the communication error between ECM or PCM 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 or PCM .

DIAGNOSIS

Required Special Tools
- MB991502. Scan Tool (MUT-II)

CAUTION: To prevent damage to scan tool MB991502, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991502.

STEP 1. Using scan tool MB991502, read the immobilizer diagnostic trouble code (DTC).

1. Connect scan tool MB991502 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 - Diagnostic Trouble Code Chart.
NO: If DTC P1610 is output again after the MFI-DTC has been erased, replace the ECM or PCM . Then check that the DTC P1610 does not reset.