NO.9 FAST IDLE/RUNS ON[AJ (3.0L Duratec)]

id0103a7801500

9
Fast idle/runs on
DESCRIPTION
•  The engine speed continues at fast idle after warm-up.
•  The engine runs after key is turned to the OFF position.
POSSIBLE CAUSE
•  ECT sensor malfunction
•  Air leakage from intake-air system
•  Throttle body malfunction
•  Accelerator cable free play misadjustment
•  Cruise control cable misadjustment

Diagnostic procedure

STEP

INSPECTION

RESULTS

ACTION
1
•  Connect the M-MDS to the DLC–2.
•  Access the ECT PID.
•  Start and warm up engine to normal operating temperature.
•  Is the ECT PID reading between 82—112 °C {180—234 °F}?
Yes
Go to the next step.
No
ECT PID is above 112 °C {234 °F}:
•  Go to symptom troubleshooting “No.17 Cooling system concerns—Overheating”.
ECT PID is below 82 °C {180 °F}:
•  Go to symptom troubleshooting “No.18 Cooling system concerns—Runs cold”.
2
•  Connect the M-MDS to the DLC–2.
•  Turn the ignition switch to the ON position (Engine off).
•  Retrieve any DTCs.
•  Is “PASSED” displayed?
Yes
No DTC is displayed:
•  Go to the next step.
No
DTC is displayed:
•  Go to the appropriate DTC test.
3
•  Is there air leakage felt or heard at intake-air system components while racing engine to higher speed?
Yes
Repair or replace parts if necessary.
No
Inspect for accelerator cable free play.
4
•  Verify the test results.
―  If normal, return to the diagnostic index to service any additional symptoms.
―  If malfunction remains, inspect related Service Information and perform repair or diagnosis.
•  If vehicle is repaired, troubleshooting completed.
•  If vehicle is not repaired or additional diagnostic information is not available, replace the PCM.