P1646

DTC P1646: ID Code Incorrectness

Wiring Diagram

Refer to Immobilizer Control System Wiring Circuit Diagram Immobilizer Control System Wiring Circuit Diagram.

DTC Detecting Condition and Trouble Area






Troubleshooting



1.
Is vehicle equipped with Immobilizer control system?
YES
Go to Step 3.
NO
Go to Step 2.

2. CAN communication circuit check

Disconnect connectors of all control modules communicating by means of CAN.
Check CAN communication circuit between control modules for open, short and high resistance.

Is each CAN communication circuit in good condition?
YES
Substitute a known-good ECM and recheck.
NO
Repair circuit.

3.
Was "Immobilizer Control System Check" performed?
YES
Go to Step 4.
NO
Go to Immobilizer Control System Check.

4. Registration of ignition key with ECM

Register the ignition key with ECM referring to Registration of the Ignition Key Registration of the Ignition Key.

Was registration of ignition key completed?
YES
Recheck DTC.
NO
Go to Step 5.

5. CAN communication circuit check

Disconnect connectors of all control modules communicating by means of CAN.
Check CAN communication circuit between control modules for open, short and high resistance.

Is each CAN communication circuit in good condition?
YES
Replace ID controller with new one. If DTC P1646 is still detected, substitute a known-good ECM and recheck.
NO
Repair circuit.