FAST IDLE/RUNS ON [SKYACTIV-G (US)]
FAST IDLE/RUNS ON [SKYACTIV-G (US)]
SM2565584
id0103s48896s6
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Troubleshooting item |
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 ignition is switched off.
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Possible cause
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• Cooling system malfunction
• PCM DTC is stored
• Accelerator pedal stuck depressed
• Erratic signal to PCM
• Improper load signal input
• Improper operation of drive-by-wire control system
• Throttle body malfunction
• Fuel injector malfunction
• Spill valve control solenoid valve malfunction (built-into high pressure fuel pump)
• Air leakage from intake-air system
• Injector driver (built-into PCM) malfunction
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System wiring diagram
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• Not applicable
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Connector diagram
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• Not applicable
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Caution
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• Verify the malfunction symptom according to not only the PID value but also the symptom troubleshooting.
Related PIDs
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PIDs |
Reference |
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A/C_REQ
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APP1
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APP2
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CLTCH_PEDAL_POS
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ECT
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ECT_VOLT
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ECT2
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ECT2_VOLT
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FUEL_PRES
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LOAD_CALC
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LONG_FUEL_TRIM
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A/F_SEN_CUR
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HO2S_OUT_VOLT
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ENG_RPM
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SHRT_FUEL_TRIM
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TP_RELAT
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VSS
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Diagnostic Procedure
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Step |
Inspection |
Results |
Action |
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1
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INSPECT COOLING SYSTEM FOR MALFUNCTION
• Access the ECT PID using the M-MDS. (See PID/DATA MONITOR INSPECTION.)
• Start the engine and warm it up completely.
• 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
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ECT PID value is higher than 112 °C {234 °F}:
• Perform the symptom troubleshooting “COOLING SYSTEM CONCERNS-OVERHEATING”. (See COOLING SYSTEM CONCERNS-OVERHEATING [SKYACTIV-G (US)].)
ECT PID value is less than 82 °C {180 °F}:
• Perform the symptom troubleshooting “COOLING SYSTEM CONCERNS-RUNS COLD”. (See COOLING SYSTEM CONCERNS-RUNS COLD [SKYACTIV-G].)
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2
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VERIFY PCM DTC
• Perform the DTC inspection for the PCM. (See DTC INSPECTION.)
• Are any DTCs displayed?
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Yes
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Repair the malfunctioning location according to the applicable DTC troubleshooting.
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No
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Go to the next step.
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3
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VERIFY CURRENT INPUT SIGNAL STATUS
• Access the following PIDs using the M-MDS: (See PID/DATA MONITOR INSPECTION.)
• Do the PIDs indicate the correct values under the malfunction condition? (See PID/DATA MONITOR TABLE [PCM (SKYACTIV-G (US))].)
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Yes
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Go to the next step.
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No
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APP1, APP2 PIDs are not as specified:
• Inspect the APP sensor No.1 and No.2. (See ACCELERATOR PEDAL POSITION (APP) SENSOR INSPECTION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (US))].) (See ACCELERATOR PEDAL POSITION (APP) SENSOR INSPECTION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (US))].)
CLTCH_PEDAL_POS PID is not as specified: (MTX)
• Inspect the clutch stroke sensor. (See CLUTCH STROKE SENSOR INSPECTION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (US))].) (See CLUTCH STROKE SENSOR INSPECTION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (US))].)
ECT, ECT_VOLT, ECT2, ECT2_VOLT PIDs are not as specified:
• Inspect the ECT sensor No.1 and No.2. (See ENGINE COOLANT TEMPERATURE (ECT) SENSOR INSPECTION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (US))].) (See ENGINE COOLANT TEMPERATURE (ECT) SENSOR INSPECTION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (US))].)
A/F_SEN_CUR, SHRT_FUEL_TRIM, LONG_FUEL_TRIM PIDs are not as specified:
• Inspect the A/F sensor. (See AIR FUEL RATIO (A/F) SENSOR INSPECTION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (US))].) (See AIR FUEL RATIO (A/F) SENSOR INSPECTION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (US))].)
HO2S_OUT_VOLT PID is not as specified:
• Inspect the HO2S. (See HEATED OXYGEN SENSOR (HO2S) INSPECTION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (US))].) (See HEATED OXYGEN SENSOR (HO2S) INSPECTION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (US))].)
Repair or replace the malfunctioning location.
• If the malfunction remains:
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4
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DETERMINE IF MALFUNCTION CAUSE IS A/C REQUEST SIGNAL OR OTHER
• Access the A/C_REQ PID using the M-MDS. (See PID/DATA MONITOR INSPECTION.)
• Monitor the A/C_REQ PID while turning on and off the air conditioner using the switch on the control panel.
• Does the A/C_REQ PID value change from on to off according to switch control panel?
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Yes
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Go to the next step.
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No
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If the A/C_REQ PID is always ON:
• Perform the symptom troubleshooting “A/C IS ALWAYS ON OR A/C COMPRESSOR RUNS CONTINUOUSLY”. (See A/C IS ALWAYS ON OR A/C COMPRESSOR RUNS CONTINUOUSLY [SKYACTIV-G].)
If the A/C_REQ PID is always OFF:
• Perform the symptom troubleshooting “A/C DOES NOT WORK SUFFICIENTLY”. (See A/C DOES NOT WORK SUFFICIENTLY [SKYACTIV-G].)
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5
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DETERMINE IF MALFUNCTION CAUSE IS DRIVE-BY-WIRE CONTROL SYSTEM OR OTHER
• Will the engine run smoothly at part throttle?
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Yes
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Go to Step 7.
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No
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Go to the next step.
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6
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INSPECT DRIVE-BY-WIRE CONTROL SYSTEM OPERATION
• Perform the Electronic Control Throttle Operation Inspection. (See ENGINE CONTROL SYSTEM OPERATION INSPECTION [SKYACTIV-G (US)].)
• Does the drive-by-wire control system work properly?
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Yes
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Visually inspect the throttle body (damage/scratching).
• If there is any malfunction:
• If there is no malfunction:
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No
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Repair or replace the malfunctioning location and perform the repair completion verification.
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7
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INSPECT FUEL INJECTOR OPERATION
• Perform the Fuel Injector Operation Inspection. (See FUEL INJECTOR INSPECTION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (US))].) (See FUEL INJECTOR INSPECTION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (US))].)
• Do the fuel injectors operate properly?
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Yes
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Go to the next step.
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No
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Repair or replace the malfunctioning location and perform the repair completion verification.
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8
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INSPECT HIGH PRESSURE FUEL PUMP
• Inspect the high pressure fuel pump. (See HIGH PRESSURE FUEL PUMP INSPECTION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (US))].) (See HIGH PRESSURE FUEL PUMP INSPECTION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (US))].)
• Is there any malfunction?
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Yes
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Replace the high pressure fuel pump and perform the repair completion verification.
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No
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Go to the next step.
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9
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INSPECT INTAKE-AIR SYSTEM FOR AIR LEAKAGE
• Inspect for leakage in intake-air system.
• Is there any leakage?
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Yes
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Repair or replace the malfunctioning location and perform the repair completion verification.
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No
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Injector driver malfunction.
• Replace the PCM. (See PCM REMOVAL/INSTALLATION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (US))].) (See PCM REMOVAL/INSTALLATION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (US))].)
If the problem remains, overhaul the engine and perform the repair completion verification.
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Repair completion verification 1
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VERIFY THAT VEHICLE IS REPAIRED
• Install/connect the part removed/disconnected during the troubleshooting procedure.
• Has the malfunction symptom been eliminated?
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Yes
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Complete the symptom troubleshooting. (Explain contents of repair to customer)
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No
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Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error.
• If the CAN communication is normal, perform the diagnosis from Step 1.
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Repair completion verification 2
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VERIFY IF MALFUNCTION IS CAUSED BY NOT PERFORMING PCM REPROGRAMMING
• Verify repair information and verify that there is a new calibration in the PCM.
• Is there a new calibration in the PCM?
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Yes
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Perform the PCM reprogramming and verify if the malfunction symptom was corrected.
• If the malfunction recurs, replace the PCM. (See PCM REMOVAL/INSTALLATION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (US))].) (See PCM REMOVAL/INSTALLATION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (US))].)
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No
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Replace the PCM.
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