P1636

DTC P1636: Immobilizer Information Registration Failure

Wiring Diagram

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

DTC Detecting Condition and Trouble Area






Troubleshooting

1.
Was "Immobilizer Control System Check" performed?
YES -
Go to Step 2.
NO -
Go to Initial Inspection and Diagnostic Overview Immobilizer Control System Check.

2. DTC Check of ECM

Check ECM for DTC referring to DTC Check DTC Check.

Is DTC U0073, U0101, U0121, U0140 and/or U0155 detected?
YES -
Go to applicable DTC troubleshooting.
NO -
Go to Step 3.

3. DTC check of BCM

Check BCM for DTC referring to DTC Check DTC Check.

Is DTC U0073, U0100, U0101, U0144, U0151 and/or U0155 detected?
YES -
Go to applicable DTC troubleshooting.
NO -
Go to Step 4.

4. CAN communication circuit check

Check for open, short and high resistance in CAN communication circuits between ECM and BCM.

Is each CAN communication circuit in good condition?
YES -
Go to Step 5.
NO -
Repair circuit.

5. Replacement of BCM

Replace BCM with new one referring to Service and Repair BCM Removal and Installation.
Check ECM for DTC referring to DTC Check DTC Check.

Is DTC P1636 still detected?
YES -
Substitute a known-good ECM and recheck.
NO -
BCM faulty.