Mazda 626 Station Wagon, Workshop Manual

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ON-BOARD DIAGNOSTIC
No
START ^
Turn ignition switch to ON position.
Does air bag system warning light illuminate For
approximately 6 seconds and then go off?
Yes
Measure voltage at DLC terminal SCN.
Is voltage
more than 2 V?
No
NO
Confirm malfunction symptom, then troubleshoot
warning light circuit of applicable malfunction,
refering to TROUBLESHOOTING INDEX.
Yes
Turn ignition switch to LOCK position.
Disconnect negative battery cable and wait for more than 1 minute.
Remove clock spring.
Remove glove compartment.
Disconnect passenger-side air bag module connector.
Disconnect driver and passenger-side side air bag module connectors. (Vehicles with side air
bag)
Remove B-pillar lower trim (Vehicle with pre-tensioner seat belt)
Disconnect driver passenger-side pre-tensioner seat belt connectors. (Vehicle with pre-tensioner
belt)
Remove side walls.
Disconnect all SAS unit connectors.
Inspect wiring harness between DLC terminal SCN and SAS unit connector terminal
2K for following.
• Short to ground
• Open circuit
Is wiring harness between two terminals normal?
Yes
Turn ignition switch to LOCK position.
Disconnect negative battery cable and wait for
more than 1 minute.
Remove side walls.
Disconnect all SAS unit connectors.
Connect negative battery cable.
Turn ignition switch to ON position.
Measure voltage at DLC terminal SCN.
Is voltage
approximately 12 V?
No
Yes
Repair or replace
wiring harness
between DLC terminal
SCN and SAS unit
connector terminal
2K.
No
Turn ignition switch
to LOCK position.
Disconnect
negative battery
cable.
Connect all SAS unit connectors.
Conned clock spring connector.
Connect passenger-side air bag module connector.
Connect driver and passenger-side side air bag module connectors. (Vehicle with side air bag)
Connect driver and passenger-side pre-tensioner seal belt connector. (Vehicle with pre-tensioner
seat belt.)
Connect negative battery cable.
Turn ignition switch to ON position, and perform present malfunction diagnosis.
Will DTC be displayed?
No
Using jumper wire, short DLC terminal SCN to body GND, turn ignition switch to ON position, and
perform past malfunction diagnosis.
Will DTC be displayed?
Yes
Yes
Disconnect end of Jumper wire connected to body GND to open DLC terminal SCN, and turn
ignition switch to ON position.
Shake related applicable wiring harnesses of applicable malfunctions.
Will DTC be displayed?
Note
• For DTCs that are same as DTCs displayed in past malfunction diagnosis, go to YES.
• For DTCs that are not displayed but were displayed in past malfunction diagnosis, go to NO.
Yes
N o
[Past malfunction]
Inspect all DTCs starting from the smallest code.
However, If an inspection item tor a part that has already been repaired appears during the
inspection, finish the inspection for that DTC at that point in time, refering to DTC TABLE.
Perform past malfunction display cancellation, refering to FOREWORD.
Using jumper wire, short DLC terminal SCN to body GND, turn ignition switch to ON position.
Will DTC be displayed?
[Present malfunction]
Inspect DTC one by one starting from
the smallest code, refering to DTC
TABLE.
Yes
Turn ignition switch to ON position.
Will DTC be displayed?
Yes
No
No
T-61