Mazda MX-6 1998, Workshop Manual

Page: 111 / 1282

TROUBLESHOOTING [ENGINE CONTROL FS]
STEP
INSPECTION ACTION
10
CHECK IAC SYSTEM FOR INTERMITTENT
OPEN OR SHORT
• NGS tester connected.
• Key on engine running.
• Access IAC and RPM PIDs.
• With engine at normal operating
temperature, accessories off and at idle,
the IAC duty cycle should read between
20% and 45%.
• Observe IAC and RPM PIDs for indication
fault while performing following at idle:
• Lightly tap on IAC valve assembly and
wiggle harness connector to simulate
road shock
• Grasp vehicle harness closest to IAC
valve assembly. Shake and bend a
small section of harness from IAC to
dash panel and from dash panel to PCM
• Do IAC or RPM PIDs suddenly change in
value indicating fault?
Yes ISOLATE fault and SERVICE as necessary.
RECONNECT all components.
RESET PCM to completely clear DTCs.
d *
After Repair Procedure
COMPLETE OBD II Drive Mode.
RERUN OBD test.
No For idle quality, starting, or stalling symptoms
currently present:
REPLACE IAC valve component.
RECONNECT all components.
RESET PCM to completely clear DTCs.
c r After Repair Procedure
COMPLETE OBD II Drive Mode.
All others:
Unable to duplicate and/or identify fault at this time.
Intermittent poor connection or component malfunction
(REPAIR or REPLACE as necessary).
Go to ENGINE SYMPTOM TROUBLESHOOTING No.27.
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