P1646

DTC P1646: ID Code Incorrectness

Wiring 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. 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 4.

4. 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.