Diagnostic Procedure

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FAST IDLE/RUNS ON (VIN Y) DIAGNOSTIC PROCEDURE

Step	Inspection	Results	Action
1	VERIFY COOLING SYSTEM OPERATION FOR MALFUNCTION Access the PCM PID [ECT] using the M-MDS. Start the engine and warm it up completely. Is the PID value between 82-112°C {180-234°F}?	Yes	Go to the next step.
1		No	ECT PID value is higher than 112°C {234°F}: Perform the symptom troubleshooting [COOLING SYSTEM CONCERNS OVERHEATING]. (See COOLING SYSTEM CONCERNS-OVERHEATING (VIN Y) .) 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 (VIN Y) .)
2	VERIFY PCM DTCs Perform the DTC inspection for the PCM. (See DTC INSPECTION .) Are any DTCs displayed?	Yes	Repair or replace the malfunctioning location according to the applicable DTC troubleshooting. (See DTC TABLE [PCM (VIN Y)] .)
2		No	Go to the next step.
3	VERIFY CURRENT INPUT SIGNAL STATUS WARNING: Observe legal speed limits when driving the vehicle and perform the procedure in a location where safety can be assured. To prevent an accident, work with two people when the vehicle is being driven (one person drives vehicle, other person operates MMDS). Access the following PIDs using the M-MDS: PCM: APP1 APP2 ECT ECT_VOLT A/F_SEN_CUR HO2S_OUT_VOLT SHRT_FUEL_TRIM LONG_FUEL_TRIM Do the PIDs indicate the correct values under the malfunction condition? (See PID/DATA MONITOR TABLE [PCM (VIN Y)] .)	Yes	Go to the next step.
3		No	APP1, APP2 PIDs are not as specified: Inspect the APP sensor No. 1 and No. 2. (Refer to ACCELERATOR PEDAL POSITION (APP) SENSOR INSPECTION (VIN Y) .) ECT, ECT_VOLT PIDs are not as specified: Inspect the ECT sensor. (Refer to ENGINE COOLANT TEMPERATURE (ECT) SENSOR INSPECTION (VIN Y) .) A/F_SEN_CUR, SHRT_FUEL_TRIM, LONG_FUEL_TRIM PIDs are not as specified: Inspect the A/F sensor. (Refer to AIR FUEL RATIO (A/F) SENSOR INSPECTION (VIN Y) .) HO2S_OUT_VOLT PID is not as specified: Inspect the HO2S. (Refer to HEATED OXYGEN SENSOR (HO2S) INSPECTION (VIN Y) .) Repair or replace the malfunctioning location. If the malfunction remains: Inspect communication error between TCM and PCM. Repair or replace the malfunctioning location and perform the repair completion verification 1. Perform the [Action for Non-repeatable Malfunction] procedure. (See TROUBLESHOOTING PROCEDURE .)
4	DETERMINE IF MALFUNCTION CAUSE IS A/C REQUEST SIGNAL OR OTHER Access the PCM [A/C_REQ] PID using the M-MDS. 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 Yes to No according to switch control panel?	Yes	Go to the next step.
4		No	If the A/C_REQ PID is always Yes: Perform the symptom troubleshooting [A/C IS ALWAYS ON OR A/C COMPRESSOR RUNS CONTINUOUSLY]. If the A/C_REQ PID is always No: Perform the symptom troubleshooting [A/C DOES NOT WORK SUFFICIENTLY].
5	DETERMINE IF MALFUNCTION CAUSE IS DRIVE-BY-WIRE CONTROL SYSTEM OR OTHER Will the engine run smoothly at part throttle?	Yes	Go to Step 7.
5		No	Go to the next step.
6	INSPECT DRIVE-BY-WIRE CONTROL SYSTEM OPERATION Perform the Electronic Control Throttle Operation Inspection. (See ENGINE CONTROL SYSTEM OPERATION INSPECTION (VIN Y) .) Does the drive-by-wire control system work properly?	Yes	Visually inspect the throttle body (damage/scratching). If there is any malfunction: Repair or replace the malfunctioning location and perform the repair completion verification 1. If there is no malfunction: Go to the next step.
6		No	Repair or replace the malfunctioning location and perform the repair completion verification 1.
7	INSPECT FUEL INJECTOR OPERATION Perform the Fuel Injector Operation Inspection. (Refer to FUEL INJECTOR INSPECTION (VIN Y) .) Do the fuel injectors operate properly?	Yes	Go to the next step.
7		No	Repair or replace the malfunctioning location and perform the repair completion verification 1.
8	INSPECT HIGH PRESSURE FUEL PUMP Inspect the applicable part. (Refer to HIGH PRESSURE FUEL PUMP INSPECTION (VIN Y) .) Is the part normal?	Yes	Go to the next step.
8		No	Repair or replace the malfunctioning location and perform the repair completion verification 1. (Refer to HIGH PRESSURE FUEL PUMP INSPECTION (VIN Y) .)
9	INSPECT INTAKE-AIR SYSTEM FOR AIR LEAKAGE Inspect for leakage in intake-air system. Is there any leakage?	Yes	Repair or replace the malfunctioning location and perform the repair completion verification 1.
9		No	Injector driver malfunction. Replace the PCM. (Refer to PCM REMOVAL/INSTALLATION (VIN Y) .) If the problem remains, overhaul the engine and perform the repair completion verification 1.
Repair completion verification 1	VERIFY THAT VEHICLE IS REPAIRED Install/connect the part removed/disconnected during the troubleshooting procedure. Has the malfunction symptom been eliminated?	Yes	Complete the symptom troubleshooting. (Explain contents of repair to customer)
Repair completion verification 1		No	Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error. (See MALFUNCTION DIAGNOSIS FLOW [CONTROLLER AREA NETWORK (CAN)] .) If the CAN communication is normal, perform the diagnosis from Step 1. If the malfunction recurs, replace the PCM. (Refer to PCM REMOVAL/INSTALLATION (VIN Y) .)