Mazda 6 2002 - Page 1015

ON-BOARD DIAGNOSTIC [IMMOBILIZER SYSTEM]
T163
T
DTC B1600
A6E817067000W05
Diagnostic procedure
End Of Sie
DTC B2431
A6E817067000W06
Diagnostic procedure
End Of Sie
DTC B1602
A6E817067000W07
Diagnostic procedure
DTC B1600 ID number is not input into PCM.
POSSIBLE
CAUSE
• No transponder in the key
• Defective transponder in the key (ID number is not output.)
STEP INSPECTION ACTION
1
REPROGRAM NEW KEY
• Register new key.
(See T90 IMMOBILIZER SYSTEM
REPROGRAM PROCEDURE)
• Clear DTCs with WDS or equivalent.
• Turn ignition switch to ON position with new
key.
Note
• Two or more valid keys are held in a
manner of not interfering each other.
• Does security light indicate DTC B1600
again?
Yes Go to next step.
No Immobilizer system is okay.
2 INSPECT FOR OTHER PROPER KEYS
• Does engine start with other proper keys?
Yes Dispose of defective key.
Duplicate key if necessary.
(See T90 IMMOBILIZER SYSTEM REPROGRAM
PROCEDURE)
No Go to next step.
3 INSPECT PCM
• Turn ignition switch from LOCK position to
START position For 2 seconds.
• Does security light indicate DTC B1600
again?
Yes Replace PCM and reprogram immobilizer system.
(See T90 IMMOBILIZER SYSTEM REPROGRAM
PROCEDURE)
No Troubleshooting is completed.
DTC B2431 ID number programing failure.
POSSIBLE
CAUSE
• The procedure fails to program the transponder into PCM
STEP INSPECTION ACTION

Go to ID number input procedure.
(See T90 IMMOBILIZER SYSTEM REPROGRAM
PROCEDURE)
DTC B1602 PCM received invalid format of ID number from key (transponder)
POSSIBLE
CAUSE
• Defective transponder in the key
• Defective coil
• Defective PCM
STEP INSPECTION ACTION
1 INSPECT FOR OTHER PROPER KEYS
• Does engine start with other proper keys?
Yes Dispose of defective key.
Duplicate key if necessary.
(See T90 IMMOBILIZER SYSTEM REPROGRAM
PROCEDURE)
No Go to next step.
2 INSPECT COIL
• Replace coil.
(See T90 COIL REMOVAL/
INSTALLATION)
• Does engine start?
Yes Coil was defective.
No Replace PCM and reprogram immobilizer system.
(See T90 IMMOBILIZER SYSTEM REPROGRAM
PROCEDURE)