DTC P1644
Precautions: Precautions for Diagnosing Trouble · Precautions for Immobilizer System · General safety (00)
DTC Detecting Condition and Trouble Area
| DTC detecting condition | Trouble area |
|---|---|
|
P1644: Immobilizer ID Mismatched Verification error between ECM and keyless entry control module. |
•Ignition key
•ECM ID code is not registered in keyless entry control module •Ignition key is not registered •Immobilizer control module circuit / connector •Immobilizer control module •Keyless entry control module power supply / ground circuit •ECM •Keyless entry control module |
DTC Troubleshooting
NOTE:
If keyless entry control module is used in another vehicle before, ignition key cannot be registered. Always install new keyless entry control module whenever replacement is necessary.
| Step | Action | Yes | No |
|---|---|---|---|
| 1 |
DTC check
1)Set ignition “OFF” and leave ignition “OFF” for 5 seconds or more.
2)Set ignition “ON”.
3)Recheck DTC.
Is current DTC P1644 detected?
|
Go to Step 2.
|
Check for intermittent trouble.
|
| 2 |
DTC check
1)Check DTC in keyless entry control module.
Is DTC B1188 or B1189 detected?
|
Go to troubleshooting for applicable DTC.
|
Go to Step 3.
|
| 3 |
Keyless entry control module power supply and ground circuit check
1)Check keyless entry control module power supply and ground circuits.
Is check result OK?
|
Go to Step 4.
|
Repair or replace defective wire harness.
|
| 4 |
ECM registration
1)Perform ECM Registration:Ignition Switch Model.
2)Check that ignition is “OFF”.
3)Set ignition “ON”.
4)Recheck DTC.
Is DTC P1644 still detected?
|
Go to Step 5.
|
End. (ECM was not registered)
|
| 5 |
Ignition key registration
1)Perform “Immobilizer Key Registration”.
2)Check that ignition is “OFF”.
3)Set ignition “ON”.
4)Recheck DTC.
Is DTC P1644 still detected?
|
Replace ECM and recheck DTC. If DTC P1644 is still detected, replace keyless entry control module and recheck DTC.
•ECM:
—M16A model:
•Keyless entry control module: —D16AA model: |
End. (Ignition key was not registered)
|