Mazda 626 - DTC P1621 (Except for GF4 A-EL Models);Diagnostic Procedure; DTC P1622 (Except for GF4 A-EL Models);Diagnostic Procedure

ON-BOARD DIAGNOSTIC
DTC P1621
Except for GF4A-EL Models
DTC P1621
Code word mismatch after engine cranking
DETECTION
CONDITION
• Code word stored in PCM and immobilizer unit does not match.
POSSIBLE
CAUSE
• Immobilizer system reprogram procedure (code word) was not performed correctly after replacing
immobilizer unit or PCM.
Diagnostic procedure
STEP INSPECTION ACTION
1
VERIFY RELATED REPAIR INFORMATION
AVAILABILITY
• Check for related Service Information
availability.
• Is any Service Information available?
Yes Perform repair or diagnosis according to available
Service Information.
• If vehicle is not repaired, then go to next step.
No Go to next step.
2
VERIFY DTC P1621 DETECTED AGAIN
• Clear DTC from memory using NGS tester.
• Turn ignition key to OFF, then start engine.
• Is same DTC present?
Yes Perform code word reprogram procedure.
(See Section T)
No Go to next step.
3 VERIFY TROUBLESHOOTING OF DTC P1621
COMPLETED
• Clear DTC from memory using NGS tester.
• Turn ignition key to OFF, then start engine.
• Is same DTC present?
Yes Replace PCM, then go to next step.
No
Go to next step.
4 VERIFY AFTER REPAIR PROCEDURE
• Perform “After Repair Procedure”
(See F1 36 AFTER REPAIR PROCEDURE)
• Are any DTCs present?
Yes Go to applicable DTC inspection.
(See F1-37 DTC TABLE)
No Troubleshooting completed.
DTC P1622
Except for GF4A-EL Models
DTC P1622 Key ID number mismatch
DETECTION
CONDITION
• ID number stored in immobilizer unit and PCM does not match. This DTC is indicated only after
immobilizer unit is replaced and reprogramming system.
POSSIBLE
CAUSE
• Transformation of key ID number stored in PCM.
Diagnostic procedure
STEP INSPECTION ACTION
1 VERIFY RELATED REPAIR INFORMATION
AVAILABILITY
• Check for related Service Information
availability.
• Is any Service Information available?
Yes
Perform repair or diagnosis according to available
Service Information.
• If vehicle is not repaired, then go to next step.
No Go to next step.
2 VERIFY DTC P1622 DETECTED AGAIN
• Clear DTC from memory using NGS tester.
• Turn ignition key to OFF, then start engine.
• Is same DTC present?
Yes Go to next step.
No Go to Step 4.
3 CHECK IF ENGINE STARTS NORMALLY
USING ANOTHER REGISTERED KEY
• Does engine start with another registered
key?
Yes Previous key is defective. Discard it.
No Go to next step.
4
VERIFY TROUBLESHOOTING OF DTC P1622
COMPLETED
• Clear DTC from memory using NGS tester.
• Turn ignition key to OFF, then start engine.
• Is same DTC present?
Yes Replace PCM, then go to next step.
No Go to next step.
F1-89