Mazda MX-6 1998, Руководство по ремонту

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TROUBLESHOOTING [ENGINE CONTROL KL]
CONTINUOUS P1479
DTC
Condenser fan control primary circuit malfunction
DESCRIPTION
• DTC P1479 indicates condenser fan circuit failure has occurred during vehicle operation
[Possible Cause]
• Open or shorted condenser fan circuit
• Open power circuit to condenser fan
STEP INSPECTION
ACTION
1
CONTINUOUS MEMORY DTC P1479:
CHECK CONDENSER CONTROL SIGNAL
FAN 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 signal circuit and ground circuit at
condenser fan vehicle harness connector.
• Key on, engine off.
• Access Output Test Mode.
• Command condenser fan control on.
• Observe test lamp for indication of fault
Yes Key off.
ISOLATE fault and SERVICE as necessary.
RESET PCM to completely clear DTCs.
t r After Repair Procedure
COMPLETE OBD II Drive Mode.
RERUN OBD Test.
while performing following (test lamp will
turn off when fault is detected, indicating an
open or short to power):
• Shake, wiggle and bend condenser fan
circuit between PCM and cooling 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 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 an indication of fault
while performing following (lamp will turn on
when 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.
ft
After Repair Procedure
COMPLETE OBD II Drive Mode.
RERUN OBD Test.
ground):
• Shake, wiggle and bend condenser fan
control circuit between PCM and cooling
fan relay.
• Shake, wiggle and bend power circuit to
cooling fan relay.
• Lightly tap on condenser fan relay to
simulate road shock.
• Key off.
•
Is fault indicated?
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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