DTC P1506[AJ (3.0L Duratec)]
id0102a4826100
DTC P1506 |
IAC overspeed error |
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DETECTION CONDITION
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• This DTC is set when the PCM detects engine idle speed that is greater than the desired rpm.
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POSSIBLE CAUSE
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• IAC solenoid valve malfunction
• Air cleaner element clogged
• Air intake passage clogged
• A/C relay control circuit malfunction
• Generator malfunction
• Purge solenoid valve malfunction
• Low engine compression (Over capacity of blow-by gas)
• PCM malfunction
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Diagnostic procedure
STEP |
INSPECTION |
ACTION |
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1
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VERIFY FREEZE FRAME DATA HAS BEEN RECORDED
• Has FREEZE FRAME DATA been recorded?
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Yes
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Go to next step.
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No
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Record FREEZE FRAME DATA on repair order, then go to next step.
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2
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VERIFY RELATED SERVICE INFORMATION AVAILABILITY
• Check for related Service Information and/or on-line Service Information availability.
• Is any related Service Information available?
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Yes
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Perform repair or diagnosis according to available Service Information.
• If vehicle is not repaired, then go to next step.
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No
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Go to next step.
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3
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VERIFY RELATED PENDING OR STORED DTCS
• Turn the ignition switch off, then ON (Engine OFF).
• Verify pending code or stored DTCs using M-MDS.
• Is other DTC present?
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Yes
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Repair applicable DTCs.
(See DTC TABLE[AJ (3.0L Duratec)].)
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No
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Go to next step.
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4
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INSPECT IAC SOLENOID VALVE MALFUNCTION
• Perform IAC solenoid valve inspection.
• Is IAC solenoid valve normal?
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Yes
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Go to next step.
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No
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Replace IAC solenoid valve, then go to Step 11.
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5
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INSPECT A/C MAGNET CLUTCH OPERATION
• Turn blower motor switch off.
• Is magnet clutch still on?
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Yes
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Refer to “A/C is always on or A/C compressor runs continuously.” of ENGINE SYMPTOM TROUBLESHOOTING, then go to Step 11.
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No
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Go to next step.
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6
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INSPECT PURGE SOLENOID VALVE MALFUNCTION
• Perform purge solenoid valve inspection.
• Is purge solenoid valve normal?
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Yes
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Go to next step.
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No
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Replace purge solenoid valve, then go to Step 11.
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7
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INSPECT AIR CLEANER ELEMENT
• Remove air cleaner element with engine running.
• Is engine speed increased?
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Yes
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Replace air cleaner element, then go to Step 11.
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No
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Go to next step.
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8
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INSPECT THROTTLE BODY PASSAGE
• Is throttle body clogged?
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Yes
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Clean or replace throttle body passage, then go to Step 11.
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No
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Go to next step.
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9
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INSPECT ENGINE COMPRESSION
• Inspect engine compression.
• Is engine compression normal?
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Yes
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Go to next step.
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No
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Overhaul engine, then go to Step 11.
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10
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INSPECT GENERATOR
• Perform generator inspection.
• Is generator normal?
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Yes
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Go to next step.
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No
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Repair or replace related part, then go to next step.
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11
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VERIFY TROUBLESHOOTING OF DTC P1506 COMPLETED
• Make sure to reconnect all disconnected connectors.
• Start engine.
• Clear DTC from PCM memory using M-MDS.
• Is PENDING CODE for this DTC present?
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Yes
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Replace PCM, then go to next step.
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No
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Go to next step.
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12
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VERIFY AFTER REPAIR PROCEDURE
• Perform "AFTER REPAIR PROCEDURE".
• Is there any DTC present?
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Yes
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Go to applicable DTC inspection.
(See DTC TABLE[AJ (3.0L Duratec)].)
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No
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Troubleshooting completed.
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