NO.20 INTERMITTENT CONCERNS [WLT-1, WLT-2]
id010396914000
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20
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Intermittent concerns
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DESCRIPTION
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• Symptom occurs randomly and is difficult to diagnose.
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POSSIBLE CAUSE
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-
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Diagnostic procedure
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STEP |
INSPECTION |
ACTION |
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1
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• Talk to customer.
• Retrieve vehicle the service history.
• Does the vehicle have a number of previous repairs and components replaced for a certain symptom?
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Yes
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Go to appropriate flow chart.
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No
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Go to the symptom index.
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3
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• Key off/
• Turn the engine switch off.
• Connect the voltmeter to the PCM terminals.
• Lightly tap on suspect component, wiggle and pull each wire/connector at suspect component or PCM.
• Is any voltage out of range, or do they suddenly change and back into range?
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Yes
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Inspect each wire for corrosion, bent or loose terminal clamps.
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No
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Go to the next step.
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3
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• Start the engine and run it at idle speed.
• Lightly tap on suspect component, wiggle and pull each wire/connector at suspect component or PCM.
• Are any voltages out of range, or do they suddenly change and go back into range?
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Yes
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Inspect each wire for corrosion, bent or loose terminal clamps.
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No
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Go to the next step.
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4
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• Accurately spray water on the suspect component wire, component or vacuum line related to the possible malfunctioning area.
• Are any PID values out of range, or suddenly change and go back into range, or was there a noticeable engine misfire/stumble?
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Yes
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Malfunctioning occurred while spraying on component:
• Replace the part and verify the repair.
Malfunctioning occurred while spraying wiring:
• Inspect each wire for corrosion, bending or loose terminals and poor wire terminal crimps.
Malfunctioning occurred while spraying vacuum line:
• Repair the vacuum hoses.
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No
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Inspect the wire and connector at the suspect component for corrosion, bending or loose terminals, poor wire terminal crimps and high tension on the wire.
Repair if necessary.
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