Mazda MX-6 1998, Workshop Manual, Page: 139 / 1282

TROUBLESHOOTING [ENGINE CONTROL FS]
CONTINUOUS P1479
DTC
Condenser fan control circuit malfunction
DESCRIPTION
• DTC P1479 indicates condenser fan control circuit failure has occurred during vehicle
operation
[Possible Cause]
• Open or shorted condenser fan control circuit • Open power circuit to condenser fan control
STEP INSPECTION ACTION
1
CONTINUOUS MEMORY DTC P1479:
CHECK CONDENSER FAN CONTROL
SIGNAL CIRCUIT FOR OPEN OR SHORT
TO POWER
• Key off.
• Turn A/C off.
• Inspect connectors for damaged or pushed
out pins, corrosion, loose wires, etc.
Service as necessary.
• Connect non-powered test lamp between
power to condenser fan control signal
circuit and ground circuit at condenser fan
vehicle harness connector.
• Key on, engine off.
• Access Output Test Mode.
• Command condenser fan control on.
Yes Key off. ISOLATE fault and SERVICE as necessary.
RESET PCM to completely clear DTCs.
tr After Repair Procedure
COMPLETE OBD II Drive Mode.
RERUN OBD Test.
• Observe test lamp for indication of fault
while performing following (the test lamp
will turn off when fault is detected indicating
an open or short to power):
• Shake, wiggle and bend the condenser
fan control signal circuit between PCM
and condenser fan relay.
• Shake, wiggle and bend power circuit to
condenser fan relay.
• Lightly tap on condenser fan relay to
simulate road shock.
• Is fault indicated?
No
Go to next step.
2
CHECK FOR CONDENSER FAN CONTROL
SIGNAL CIRCUIT SHORT TO GROUND
• Key on, engine off.
• Condenser fan disconnected, test lamp
installed.
• NGS tester connected.
• Command condenser fan off.
• Observe test lamp for indication of a fault
while performing following (lamp will turn on
when a fault is detected, indicating an
condenser fan control signal circuit short to
Yes Isolate fault and service as necessary.
RESET PCM to completely clear DTCs.
it
After Repair Procedure
COMPLETE OBD II Drive Mode.
RERUN OBD Test.
ground):
• Shake, wiggle and bend condenser fan
control circuit between PCM and
condenser fan relay.
• Shake, wiggle and bend power circuit to
condenser fan relay.
• Lightly tap on condenser fan relay to
simulate road shock.
• Key off.
• Is fa u lt in d ica ted ?
No
Unable to duplicate or identify fault at this time.
Intermittent poor connection or component malfunction.
(SERVICE or REPLACE as necessary).
Go to ENGINE SYMPTOM TROUBLE SHOOTING No.27.
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