Mazda MX-6 1998, Workshop Manual

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TROUBLESHOOTING [IMMOBILIZER SYSTEM]
DTC P1622 Key ID number does not match
DESCRIPTION * ID number stored in immobilizer unit (IU) and PCM does not match. This DTC is indicated only after
immobilizer unit is replaced and reprogramming system.
[Possible Cause]
• Unregistered key is used in step 3 of immobilizer system • Transformation of key ID number stored in PCM.
reprogram procedure (IU replacement).
STEP INSPECTION
ACTION
1 CHECK DTC PRESENT
• RESET PCM to completely clear DTCs.
a- After Repair Procedure
• RERUN OBD test.
• Is same DTC present after cranking?
Yes Go to next step.
No Different DTC displayed:
Go to appropriate DTC inspection.
No DTC displayed:
Troubleshooting is completed.
2 CHECK ENGINE IS STARTING NORMALLY
USING ANOTHER REGISTERED KEY
• Does engine start with another registered
key?
Yes Previous key is defective. Discard it.
No Replace PCM and reprogram immobilizer system,
r r 0 9 -1 4 IMMOBILIZER SYSTEM REPROGRAMMING
PROCEDURE, PCM Replacement
DTC P1623 Code word or key ID number write/read error in PCM
DESCRIPTION • PCM internal EEPROM damaged
[Possible Cause]
• PCM internal EEPROM damaged
STEP INSPECTION ACTION
1 CHECK DTC PRESENT
• RESET PCM to completely clear DTCs.
tr After Repair Procedure
• RERUN OBD test.
• Is same DTC present after cranking?
Yes Replace PCM and reprogram immobilizer system.
o - 0 9 -1 4 IMMOBILIZER SYSTEM REPROGRAMMING
PROCEDURE, PCM Replacement
No
Different DTC displayed:
Go to appropriate DTC inspection.
No DTC displayed:
Troubleshooting is completed.
DTC P1624 Immobilizer system communication counter = 0
DESCRIPTION • PCM detected immobilizer system malfunction more than three times.
[Possible Cause]
• Engine was attempted to start more than three times
under malfunction.
•s
STEP
INSPECTION
ACTION
1
CHECK DTC P1624 PRESENT
• RESET PCM to completely clear. DTCs
c r After Repair Procedure
• RERUN OBD test.
• Is P1624 still present after cranking?
Yes Go to next step.
No Troubleshooting is completed.
2 CHECK DTC PRESENT Yes Go to other DTC inspection.
• Is there another DTC.
No
Go to ENGINE SYMPTOM TROUBLESHOOTING No.5.
0 9 -0 1 F -8