Mazda 6 2002 Workshop Manual page 1015

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