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 Initial Inspection and Diagnostic Overview 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.