Diagnostic Procedure

WARNING: This page is about a different variant/trim than selected.

LACK/LOSS OF POWER-ACCELERATION/CRUISE (VIN Y) DIAGNOSTIC PROCEDURE

Step	Inspection	Results	Action
1	VERIFY IF MALFUNCTION INCLUDES ROUGH IDLING Does the engine idle rough?	Yes	Perform the symptom troubleshooting [ENGINE RUNS ROUGH/ROLLING IDLE]. (See ENGINE RUNS ROUGH/ROLLING IDLE (VIN Y) .)
1		No	Go to the next step.
2	DETERMINE IF MALFUNCTION CAUSE IS OVERHEATING OR OTHER 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 M-MDS). Access the PCM PID [ECT] using the M-MDS. Is the PID value less than 116°C {241°F} during driving?	Yes	Go to the next step.
2		No	The cause of this concern could be from the cooling system overheating. Perform the symptom troubleshooting [COOLING SYSTEM CONCERNS OVERHEATING]. (See COOLING SYSTEM CONCERNS-OVERHEATING (VIN Y) .)
3	CONFIRM DRIVE-BY-WIRE CONTROL SYSTEM OPERATES WITH BRAKE OVERRIDE SYSTEM Perform the DTC inspection for the PCM. (See DTC INSPECTION .) Is the DTC P2299:00 present?	Yes	Repair the malfunctioning location according to the applicable DTC troubleshooting. (Drive-by-wire control system operates with brake override system.) (See P2299:00 [PCM (VIN Y)] .)
3		No	Go to the next step.
4	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)] .)
4		No	Go to the next step.
5	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 M-MDS). Access the following PIDs using the M-MDS: PCM: APP1 APP2 ECT ECT_VOLT ECT2 ECT2_VOLT FUEL_PRES IAT IAT2 MAF MAP MAP_VOLT TP_RELAT A/F_SEN_CUR HO2S_OUT_VOLT BOOST_AIR_TEMP_VOLT BOOST_AIR_TEMP BOOST_PRES_ACT_VOLT BOOST_PRES_ACT 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.
5		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 No. 1. (Refer to ENGINE COOLANT TEMPERATURE (ECT) SENSOR INSPECTION (VIN Y) .) ECT2, ECT2_VOLT PIDs are not as specified: Inspect the ECT sensor No. 2. (Refer to ENGINE COOLANT TEMPERATURE (ECT) SENSOR INSPECTION (VIN Y) .) FUEL_PRES PID is not as specified: Inspect the high fuel pressure sensor. (Refer to HIGH FUEL PRESSURE SENSOR INSPECTION (VIN Y) .) IAT PID is not as specified: Inspect the IAT sensor No. 1. (Refer to INTAKE AIR TEMPERATURE (IAT) SENSOR INSPECTION (VIN Y) .) IAT2 PID is not as specified: Inspect the IAT sensor No. 2. (Refer to INTAKE AIR TEMPERATURE (IAT) SENSOR INSPECTION (VIN Y) .) MAF PID is not as specified: Inspect the MAF sensor. (Refer to MASS AIR FLOW (MAF) SENSOR INSPECTION (VIN Y) .) MAP, MAP_VOLT PIDs are not as specified: Inspect the MAP sensor. (Refer to MANIFOLD ABSOLUTE PRESSURE (MAP) SENSOR INSPECTION (VIN Y) .) TP_RELAT PIDs are not as specified: Inspect the TP sensor. (Refer to THROTTLE POSITION (TP) SENSOR INSPECTION (VIN Y) .)
5		No	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) .) BOOST_AIR_TEMP_VOLT, BOOST_AIR_TEMP PIDs are not as specified: Inspect the boost air temperature sensor. (Refer to BOOST AIR TEMPERATURE SENSOR INSPECTION (VIN Y) .) BOOST_PRES_ACT_VOLT, BOOST_PRES_ACT PIDs are not as specified: Inspect the boost pressure sensor. (Refer to BOOST PRESSURE SENSOR 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 .)
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 PURGE CONTROL SYSTEM OPERATION Perform the Purge Control System Inspection. (Refer to PURGE SOLENOID VALVE INSPECTION (VIN Y) .) Does the purge solenoid valve work properly?	Yes	Go to the next step.
8		No	Repair or replace the malfunctioning location and perform the repair completion verification 1.
9	VERIFY FUEL LEAKAGE FOR MALFUNCTION Visually inspect the fuel system pipes. Is there any leakage?	Yes	Repair or replace the malfunctioning location and perform the repair completion verification 1.
9		No	Go to the next step.
10	INSPECT RELATED PART CONDITION Inspect the following: Poor fuel quality (proper octane, contamination, winter/summer blend) Air leakage from intake-air system Intake-air system restriction Vacuum leakage Air cleaner restricted or dirty Brake dragging Tire air pressure CKP sensor and intake CMP sensor Installation condition (Refer to CRANKSHAFT POSITION (CKP) SENSOR REMOVAL/INSTALLATION (VIN Y) .) (Refer to CAMSHAFT POSITION (CMP) SENSOR REMOVAL/INSTALLATION (VIN Y) .) Damaged trigger wheel (intake camshaft) Exhaust CMP sensor Installation condition (Refer to CAMSHAFT POSITION (CMP) SENSOR REMOVAL/INSTALLATION (VIN Y) .) Damaged trigger wheel (exhaust camshaft) Is there any malfunction?	Yes	Repair or replace the malfunctioning location and perform the repair completion verification 1.
10		No	Go to the next step.
11	VERIFY WATER-COOLED CHARGE AIR COOLER FOR MALFUNCTION Inspect the applicable part. (Refer to WATER-COOLED CHARGE AIR COOLER COOLANT LEAKAGE INSPECTION (VIN Y) .) Is the part normal?	Yes	Go to the next step.
11		No	Repair or replace the malfunctioning location and perform the repair completion verification 1. (Refer to WATER-COOLED CHARGE AIR COOLER COOLANT REPLACEMENT (VIN Y) .)
12	VERIFY ELECTRIC WATER PUMP FOR MALFUNCTION Inspect the applicable part. (Refer to ELECTRIC WATER PUMP INSPECTION (VIN Y) .) Is the part normal?	Yes	Go to the next step.
12		No	Repair or replace the malfunctioning location and perform the repair completion verification 1. (Refer to ELECTRIC WATER PUMP REMOVAL/INSTALLATION (VIN Y) .)
13	INSPECT FUEL PRESSURE (HIGH-SIDE) Start the engine and warm it up completely. Access the PCM PID [FUEL_PRES] using the MMDS at idle. Is the PID value within specification? Specification: Approx. 10 MPa {102 kgf/cm ² , 1450 psi}	Yes	Go to Step 15.
13		No	Lower than specification: Inspect the following: Fuel leakage at the fuel line and fuel injector Fuel pump Perform the Fuel Pump (Low-pressure side) Operation Inspection. (Refer to FUEL PUMP OPERATION INSPECTION .) High fuel pressure sensor (Refer to HIGH FUEL PRESSURE SENSOR INSPECTION (VIN Y) .) High pressure fuel pump (Refer to HIGH PRESSURE FUEL PUMP INSPECTION (VIN Y) .) 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. Higher than specification: Go to the next step.
14	INSPECT WIRING HARNESS (INCLUDING CONNECTOR/TERMINAL) BETWEEN PCM AND SPILL VALVE CONTROL SOLENOID VALVE (HIGH PRESSURE FUEL PUMP) FOR MALFUNCTION Inspect the applicable circuit. (see CIRCUIT INSPECTION .) (see CONNECTOR INSPECTION .) Is the circuit normal?	Yes	Replace the high pressure fuel pump and perform the repair completion verification 1. (Refer to HIGH PRESSURE FUEL PUMP INSPECTION (VIN Y) .)
14		No	Repair or replace the malfunctioning location and perform the repair completion verification 1.
15	INSPECT FUEL PRESSURE (LOW-SIDE) Connect the fuel pressure gauge between fuel pump and high pressure fuel pump. Measure the low side fuel pressure. (Refer to FUEL LINE PRESSURE INSPECTION (VIN Y) .) Is the low side fuel pressure within specification? Specification: 545-695 kPa {5.56-7.08 kgf/cm ² , 79.1-100.0 psi}	Yes	Go to the next step.
15		No	Inspect the following: Fuel line restriction Fuel filter clogged Fuel pump control module (Refer to FUEL PUMP CONTROL MODULE INSPECTION (VIN Y) .) If there is any malfunction: Repair or replace the malfunctioning location and perform the repair completion verification 1. If there is no malfunction: Replace the fuel pump unit and perform the repair completion verification 1. (Refer to FUEL PUMP UNIT REMOVAL/INSTALLATION (VIN Y) .)
16	INSPECT THROTTLE BODY FOR CLOGGING Visually inspect the throttle valve. (Refer to INTAKE-AIR SYSTEM REMOVAL/INSTALLATION (VIN Y) .) Is the throttle body normal?	Yes	Go to the next step.
16		No	Clean the throttle valve and perform the repair completion verification 1.
17	INSPECT WASTEGATE VALVE ACTUATOR FOR MALFUNCTION Inspect the applicable part. (Refer to WASTEGATE VALVE ACTUATOR INSPECTION (VIN Y) .) Is the part normal?	Yes	Go to the next step.
17		No	Repair or replace the malfunctioning location and perform the repair completion verification 1. (Refer to WASTEGATE VALVE ACTUATOR REMOVAL/INSTALLATION (VIN Y) .)
18	INSPECT ENGINE COMPRESSION Measure the compression pressure for each cylinder. (Refer to COMPRESSION INSPECTION (VIN Y) .) Are compression pressures within specification?	Yes	Go to Step 24.
18		No	Go to the next step.
19	VERIFY ELECTRIC VARIABLE VALVE TIMING DRIVER FOR MALFUNCTION Inspect the applicable part. (Refer to ELECTRIC VARIABLE VALVE TIMING MOTOR/DRIVER INSPECTION (VIN Y) .) Is the part normal?	Yes	Go to the next step.
19		No	Repair or replace the malfunctioning location and perform the repair completion verification 1. (Refer to ELECTRIC VARIABLE VALVE TIMING MOTOR/DRIVER REMOVAL/INSTALLATION (VIN Y) .)
20	VERIFY ELECTRIC VARIABLE VALVE TIMING MOTOR FOR MALFUNCTION Inspect the applicable part. (Refer to ELECTRIC VARIABLE VALVE TIMING MOTOR/DRIVER INSPECTION (VIN Y) .) Is the part normal?	Yes	Go to the next step.
20		No	Repair or replace the malfunctioning location and perform the repair completion verification 1. (Refer to ELECTRIC VARIABLE VALVE TIMING MOTOR/DRIVER REMOVAL/INSTALLATION (VIN Y) .)
21	VERIFY ELECTRIC VARIABLE VALVE TIMING ACTUATOR FOR MALFUNCTION Inspect the applicable part. (Refer to ELECTRIC VARIABLE VALVE TIMING ACTUATOR INSPECTION (VIN Y) .) Is the part normal?	Yes	Go to the next step.
21		No	Repair or replace the malfunctioning location and perform the repair completion verification 1. (Refer to ELECTRIC VARIABLE VALVE TIMING ACTUATOR, HYDRAULIC VARIABLE VALVE TIMING ACTUATOR REMOVAL/INSTALLATION (VIN Y) .)
22	INSPECT HYDRAULIC VARIABLE VALVE TIMING CONTROL SYSTEM OPERATION Perform the Hydraulic Variable Valve Timing Control System Operation Inspection. (Refer to OIL CONTROL VALVE (OCV) INSPECTION (VIN Y) .) Is there any malfunction?	Yes	Repair or replace the malfunctioning location and perform the repair completion verification 1.
22		No	Go to the next step.
23	INSPECT FOR MALFUNCTION DUE TO DEVIATED VALVE TIMING Inspect the valve timing (timing chain installation condition). (Refer to TIMING CHAIN REMOVAL/INSTALLATION (VIN Y) .) Is the valve timing normal?	Yes	Inspect for the following engine internal parts: Cylinder Piston ring Intake valve Exhaust valve Such as cylinder head gasket If there is any malfunction: Repair or replace the malfunctioning location and perform the repair completion verification 1.
23		No	Adjust the valve timing to the correct timing and perform the repair completion verification 1.
24	VERIFY SPARK PLUG CONDITION Inspect the spark plug condition. (Refer to SPARK PLUG INSPECTION (VIN Y) .) Inspect the spark plug normal?	Yes	Go to the next step.
24		No	Spark plug is wet or covered with carbon: Perform the Spark Test. (Refer to SPARK INSPECTION (VIN Y) .) Repair or replace the malfunctioning location and perform the repair completion verification 1. Spark plug is grayish white: Inspect the fuel injector for restriction. Repair or replace the malfunctioning location and perform the repair completion verification 1.
25	INSPECT THREE WAY SOLENOID VALVE FOR MALFUNCTION Inspect the applicable part. (Refer to THREE WAY SOLENOID VALVE INSPECTION (VIN Y) .) Is the part normal?	Yes	Go to the next step.
25		No	Repair or replace the malfunctioning location and perform the repair completion verification 1. (Refer to THREE WAY SOLENOID VALVE REMOVAL/INSTALLATION (VIN Y) .)
26	INSPECT EXHAUST SYSTEM FOR RESTRICTION Inspect for restriction in the exhaust system and the TWC. Is there any restriction?	Yes	Repair or replace the malfunctioning location and perform the repair completion verification 1.
26		No	Go to the next step.
27	VERIFY EGR VALVE FOR MALFUNCTION Inspect the applicable part. (Refer to EGR VALVE INSPECTION (VIN Y) .) Is the part normal?	Yes	Go to the next step.
27		No	Repair or replace the malfunctioning location and perform the repair completion verification 1. (Refer to EGR COOLER REMOVAL/INSTALLATION (VIN Y) .)
28	VERIFY DYNAMIC PRESSURE TURBO FOR MALFUNCTION Inspect the applicable part. (Refer to DYNAMIC PRESSURE TURBO INSPECTION (VIN Y) .) Is the part normal?	Yes	Go to the next step.
28		No	Repair or replace the malfunctioning location and perform the repair completion verification 1. (Refer to CHECK VALVE (EMISSION SYSTEM) REMOVAL/INSTALLATION (VIN Y) .)
29	INSPECT IF MALFUNCTION CAUSE IS PCV VALVE OR INJECTOR DRIVER (PCM INTEGRATED) Inspect the PCV valve. (Refer to POSITIVE CRANKCASE VENTILATION (PCV) VALVE INSPECTION (VIN Y) .) Is there any malfunction?	Yes	Replace the PCV valve and perform the repair completion verification 1. (Refer to POSITIVE CRANKCASE VENTILATION (PCV) VALVE REMOVAL/INSTALLATION (VIN Y) .)
29		No	Injector driver malfunction. Replace the PCM. (Refer to PCM REMOVAL/INSTALLATION (VIN Y) .) If the problem remains, replace 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, go to the next step.
Repair completion verification 2	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?	Yes	Perform the PCM reprogramming and verify if the malfunction symptom was corrected. If the malfunction recurs, replace the PCM. (Refer to PCM REMOVAL/INSTALLATION (VIN Y) .)
Repair completion verification 2		No	Replace the PCM. (Refer to PCM REMOVAL/INSTALLATION (VIN Y) .)