NO.14 FAST IDLE/RUNS ON [SKYACTIV-D 2.2]

id0103g1898100

14	FAST IDLE/RUNS ON
DESCRIPTION	•  Engine speed continues at fast idle after warm-up. •  Engine runs after ignition is switched off.
POSSIBLE CAUSE	•  PCM DTC is stored. •  Erratic signal to PCM ―  Engine speed signal •  Fuel injection system malfunction ―  Fuel leakage from fuel system ―  Common rail malfunction ―  Supply pump malfunction ―  Suction control valve malfunction ―  Fuel injector malfunction ―  Fuel pressure relief valve malfunction ―  Fuel check valve or fuel feed valve malfunction •  Mechanical (engine) malfunction ―  Engine oil malfunction (oil working up or down)

Diagnostic Procedure

STEP	INSPECTION	RESULTS	ACTION
1	VERIFY PCM DTC •  Retrieve PCM DTCs using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST [SKYACTIV-D 2.2].) •  Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [SKYACTIV-D 2.2].)
		No	Go to the next step.
2	VERIFY CURRENT INPUT SIGNAL STATUS Caution •  While performing this step, always operate the vehicle in a safe and lawful manner. •  When the M-MDS is used to observe monitor system status while driving, be sure to have another technician with you, or record the data in the M-MDS using the PID/DATA MONITOR AND RECORD capturing function and inspect later. •  Access the following PIDs using the M-MDS: (See ON-BOARD DIAGNOSTIC TEST [SKYACTIV-D 2.2].) ―  RPM ―  ARPMDES •  Is the difference between the RPM monitor value and the ARPMDES monitor value within the specified value? (See ENGINE TUNE-UP [SKYACTIV-D 2.2].)	Yes	Inspect the related sensor and circuit. •  If there is any malfunction: ―  Repair or replace the malfunctioning part according to the inspection results, then go to Step 6. •  If there is no malfunction: ―  Go to the next step.
		No	Go to the next step.
3	INSPECT FOR FUEL LEAKAGE FROM FUEL SYSTEM •  Visually inspect the following: ―  Fuel leakage from the fuel tank, fuel pump, hose, pipe, fuel injector, supply pump, common rail ―  Cracking and damage in fuel hose and pipe ―  Clamp installation condition for each hose and pipe ―  Fuel pipe securing condition due to deterioration such as rubber of clamp •  Are all items normal?	Yes	Go to the next step.
		No	Repair or replace the malfunctioning part according to the inspection results, then go to Step 6.
4	INSPECT FUEL INJECTION RELATED PARTS •  Inspect the following parts: ―  Common rail (See COMMON RAIL INSPECTION [SKYACTIV-D 2.2].) ―  Supply pump (See SUPPLY PUMP INSPECTION [SKYACTIV-D 2.2].) ―  Suction control valve (See SUCTION CONTROL VALVE INSPECTION [SKYACTIV-D 2.2].) ―  Fuel injector (See FUEL INJECTOR INSPECTION [SKYACTIV-D 2.2].) ―  Fuel pressure relief valve (See FUEL PRESSURE RELIEF VALVE INSPECTION [SKYACTIV-D 2.2].) •  Are all items normal?	Yes	Go to the next step.
		No	Repair or replace the malfunctioning part according to the inspection results, then go to Step 6.
5	INSPECT FOR MALFUNCTION DUE TO INTERNAL ENGINE WEAR, DAMAGE •  Inspect for the following engine internal parts: ―  Cylinder ―  Piston ring ―  Intake valve ―  Exhaust valve ―  Such as cylinder head gasket •  Are all items normal?	Yes	Replace the lower case, then go to the next step. (Fuel may not inject normally because there is a malfunction in the fuel check valve and fuel feed valve.) (See LOWER CASE REMOVAL/INSTALLATION [SKYACTIV-D 2.2].)
		No	Repair or replace the malfunctioning part according to the inspection results, then go to the next step.
6	Verify the test results. •  If normal, return to the diagnostic index to service any additional symptoms. (See SYMPTOM DIAGNOSTIC INDEX [SKYACTIV-D 2.2].) •  If a malfunction remains, inspect the related Service Information and perform the repair or diagnosis. ―  If the vehicle is repaired, troubleshooting is completed. ―  If the vehicle is not repaired or additional diagnostic information is not available, replace the PCM. (See PCM REMOVAL/INSTALLATION [SKYACTIV-D 2.2].)