Mitsubishi MOTORS Space Runner 1999 Workshop Manual Supplement page 499

13B-18
Code No.54 Immobilizer system
Range of Check
Ignition switch: ON
Set Conditions
Improper communication between the engine-ECU and immobilizer-ECU
NOTE
(1) If the ignition switches are close each other when starting the engine, radio interference may cause
this code to be displayed.
(2) This code may be displayed when registering the key ID code.
Is there another ignition key near the ignition key that is inserted
in the ignition switch?
Is a diagnosis code output from the immobilizer-ECU?
Check the following connectors:
B-19, B-30, B-36
Check trouble symptom.
Check the harness wire between the engine-ECU and the immobi-
lizer-ECU.
Repair
MPI –
No
No
OK
NG
NG
Troubleshooting
Probable cause
Radio interference of ID codes
Incorrect ID code
Malfunction of harness or connector
Malfunction of immobilizer-ECU
Malfunction of engine-ECU
Yes
Remove the extra ignition key.
NG
Check trouble symptom.
Yes
Check the immobilizer system. (Refer to GROUP 54 – Ignition
Switch and Immobilizer System.)
NG
Repair
OK
Replace the immobilizer-ECU.
Check trouble symptom.
Replace the engine-ECU.
NG
NG