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 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.