id0103a8801500
| 9 |
FAST IDLE/RUNS ON |
|---|---|
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DESCRIPTION
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• Engine speed continues at fast idle after warm-up.
• Engine runs after the ignition is off.
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POSSIBLE CAUSE
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• ECT sensor malfunction
• A/C switch malfunction
• Refrigerant pressure sensor malfunction
• Evaporator temperature sensor malfunction
• FAN switch malfunction
• Communication error between climate control unit and instrument cluster
• Communication error between instrument cluster and PCM
• TR switch malfunction
• Communication error between TCM and PCM
• Air leakage from intake air system
• Improper operation of electronic throttle control system
• APP sensor malfunction
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Diagnostic procedure
| STEP |
INSPECTION |
RESULTS |
ACTION |
|---|---|---|---|
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1
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Access the ECT PID using the M-MDS.
Start and warm up the engine to normal operating temperature.
Is the ECT PID value between
82—112 °C {180—234 °F}?
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Yes
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Go to the next step.
|
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No
|
ECT PID value is
higher than 112 °C {234 °F}:
• Go to the symptom troubleshooting “NO.17 COOLING SYSTEM CONCERNS-OVERHEATING”. (See
NO.17 COOLING SYSTEM CONCERNS-OVERHEATING [L5].)
ECT PID value is
less than 82 °C {180 °F}:
• Go to the symptom troubleshooting “NO.18 COOLING SYSTEM CONCERNS-RUNS COLD”. (See
NO.18 COOLING SYSTEM CONCERNS-RUNS COLD [L5].)
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2
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Perform the PCM DTC inspection using the M-MDS.
Are any DTCs present?
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Yes
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Go to the applicable DTC inspection.
(See
DTC TABLE [L5].)
|
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No
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Go to the next step.
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3
|
Access the AC_REQ and TR PIDs using the M-MDS.
Are the PID values normal?
(See
PCM INSPECTION [L5].)
|
Yes
|
Go to the next step.
|
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No
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AC_REQ PID is not specified:
• Inspect the A/C switch, refrigerant pressure sensor, evaporator temperature sensor and fan switch. (See
REFRIGERANT PRESSURE SENSOR INSPECTION [FULL-AUTO AIR CONDITIONER].) (See
EVAPORATOR TEMPERATURE SENSOR INSPECTION [FULL-AUTO AIR CONDITIONER].)
• Inspect communication error between climate control unit and instrument cluster.
• Inspect communication error between instrument cluster and PCM.
TR PID is not specified:
• Inspect the TR switch. (See
TRANSAXLE RANGE (TR) SWITCH INSPECTION [FS5A-EL].)
• Inspect communication error between TCM and PCM.
Repair or replace the malfunctioning part according to the inspection results.
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4
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Is there air leakage felt or heard at the intake air system components while racing the engine to higher speed?
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Yes
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Repair or replace the malfunctioning part according to the inspection results.
|
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No
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Inspect the following:
• Electronic throttle control system operation (See
ENGINE CONTROL SYSTEM OPERATION INSPECTION [L5].)
• APP sensor (See
ACCELERATOR PEDAL POSITION (APP) SENSOR INSPECTION [L5].)
Repair or replace the malfunctioning part according to the inspection results.
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5
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Verify test results.
• If normal, return to the diagnostic index to service any additional symptoms. (See
SYMPTOM DIAGNOSTIC INDEX [L5].)
• If the malfunction remains, inspect the related Service Information and perform the repair or diagnosis.
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