Diagnostic Procedure

STEP	INSPECTION	RESULTS	ACTION
1	VERIFY IF MALFUNCTION INCLUDES ROUGH IDLING Does the engine idle rough?	Yes	Perform the symptom troubleshooting "NO. 8 ENGINE RUNS ROUGH/ROLLING IDLE". Refer too NO. 8 ENGINE RUNS ROUGH/ROLLING IDLE [SKYACTIV-G 2.5T] .)
1		No	Go to the next step.
2	VERIFY IF MALFUNCTION CAUSE IS OVERHEATING Access the ECT PID using the M-MDS. Refer too ON-BOARD DIAGNOSTIC TEST [PCM (SKYACTIV-G 2.5T)] .) 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. Is the ECT PID value less than 116 °C {241 °F } during driving?	Yes	Go to the next step.
2		No	Perform the symptom troubleshooting "NO. 17 COOLING SYSTEM CONCERNS-OVERHEATING". Refer too NO. 17 COOLING SYSTEM CONCERNS-OVERHEATING [SKYACTIV-G 2.5T] .)
3	CONFIRM DRIVE-BY-WIRE CONTROL SYSTEM OPERATES WITH BRAKE OVERRIDE SYSTEM Retrieve the PCM DTC using the M-MDS. Refer too ON-BOARD DIAGNOSTIC TEST [PCM (SKYACTIV-G 2.5T)] .) Is the DTC P2299:00 present?	Yes	Go to the applicable DTC inspection. (drive-by-wire control system operates with brake override system.) Refer too DTC P2299:00 [PCM (SKYACTIV-G 2.5T)] .)
3		No	Go to the next step.
4	VERIFY PCM DTC Retrieve any DTCs using the M-MDS. Refer too ON-BOARD DIAGNOSTIC TEST [PCM (SKYACTIV-G 2.5T)] .) Are any DTCs present?	Yes	Go to the applicable DTC inspection. Refer too DTC TABLE [PCM (SKYACTIV-G 2.5T)] .)
4		No	Go to the next step.
5	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: Refer too ON-BOARD DIAGNOSTIC TEST [PCM (SKYACTIV-G 2.5T)] .) APP1 APP2 ECT FUEL_PRES IAT MAF MAP MAP_V TP_REL O2S11 O2S12 SHRTFT1 INLET_PRES Do the PIDs indicate the correct values under the trouble condition? Refer too PCM INSPECTION [SKYACTIV-G 2.5T] .)	Yes	Go to the next step.
5		No	APP1, APP2 PIDs are not as specified: Inspect the APP sensor. Refer too ACCELERATOR PEDAL POSITION (APP) SENSOR INSPECTION [SKYACTIV-G 2.5T] .) ECT PID is not as specified: Inspect the ECT sensor No. 1. Refer too ENGINE COOLANT TEMPERATURE (ECT) SENSOR INSPECTION [SKYACTIV-G 2.5T] .) FUEL_PRES PID is not as specified: Inspect the high fuel pressure sensor. Refer too HIGH FUEL PRESSURE SENSOR INSPECTION [SKYACTIV-G 2.5T] .) IAT PID is not as specified: Inspect the IAT sensor No. 1. Refer too INTAKE AIR TEMPERATURE (IAT) SENSOR INSPECTION [SKYACTIV-G 2.5T] .) MAF PID is not as specified: Inspect the MAF sensor. Refer too MASS AIR FLOW (MAF) SENSOR INSPECTION [SKYACTIV-G 2.5T] .) MAP, MAP_V PIDs are not as specified: Inspect the MAP sensor. Refer too MANIFOLD ABSOLUTE PRESSURE (MAP) SENSOR INSPECTION [SKYACTIV-G 2.5T] .) TP_REL PID is not as specified: Inspect the TP sensor. Refer too THROTTLE POSITION (TP) SENSOR INSPECTION [SKYACTIV-G 2.5T] .) O2S11, SHRTFT1, LONGFT1 PIDs are not as specified: Inspect the A/F sensor. Refer too AIR FUEL RATIO (A/F) SENSOR INSPECTION [SKYACTIV-G 2.5T] .) O2S12 PID is not as specified: Inspect the HO2S. Refer too HEATED OXYGEN SENSOR (HO2S) INSPECTION [SKYACTIV-G 2.5T] .) INLET_PRES PID is not as specified: Inspect the boost pressure sensor inspection. Refer too BOOST PRESSURE SENSOR INSPECTION [SKYACTIV-G 2.5T] .) Repair or replace the malfunctioning part according to the inspection results. If the malfunction remains: Inspect communication error between TCM and PCM. Repair or replace the malfunctioning part according to the inspection results if necessary. Perform the "INTERMITTENT CONCERN TROUBLESHOOTING " procedure. Refer too INTERMITTENT CONCERN TROUBLESHOOTING [SKYACTIV-G 2.5T] .)
6	INSPECT DRIVE-BY-WIRE CONTROL SYSTEM OPERATION Perform the Electronic Control Throttle Operation Inspection. Refer too ENGINE CONTROL SYSTEM OPERATION INSPECTION [SKYACTIV-G 2.5T] .) Does the drive-by-wire control system work properly?	Yes	Go to the next step.
6		No	Repair or replace the malfunctioning part according to the inspection results.
7	INSPECT FUEL INJECTOR OPERATION Perform the Fuel Injector Operation Inspection. Refer too ENGINE CONTROL SYSTEM OPERATION INSPECTION [SKYACTIV-G 2.5T] .) Do the fuel injectors operate properly?	Yes	Go to the next step.
7		No	Repair or replace the malfunctioning part according to the inspection results.
8	INSPECT PURGE CONTROL SYSTEM OPERATION Perform the Purge Control System Inspection. Refer too ENGINE CONTROL SYSTEM OPERATION INSPECTION [SKYACTIV-G 2.5T] .) Does the purge solenoid valve work properly?	Yes	Go to the next step.
8		No	Repair or replace the malfunctioning part according to the inspection results.
9	INSPECT FUEL SYSTEM FOR FUEL LEAKAGE Inspect for fuel leakage in the fuel line. Is there any leakage?	Yes	Repair or replace the malfunctioning part according to the inspection results.
9		No	Go to the next step.
10	INSPECT RELATED PART CONDITION Inspect the following: Fuel quality (proper octane, contamination, winter/summer blend) Air leakage or restriction in intake-air system Vacuum leakage Air cleaner restricted or dirty Brake dragging Charge air cooler malfunction Tire air pressure CKP sensor and intake CMP sensor Installation condition Refer too CAMSHAFT POSITION (CMP) SENSOR REMOVAL/INSTALLATION [SKYACTIV-G 2.5T] .) Refer too CAMSHAFT POSITION (CMP) SENSOR REMOVAL/INSTALLATION [SKYACTIV-G 2.5T] .) Damaged trigger wheel (intake camshaft) Exhaust CMP sensor Installation condition Refer too CAMSHAFT POSITION (CMP) SENSOR REMOVAL/INSTALLATION [SKYACTIV-G 2.5T] .) Damaged trigger wheel (exhaust camshaft) Is there any malfunction?	Yes	Service if necessary. Repeat this step.
10		No	Go to the next step.
11	INSPECT FUEL PRESSURE (HIGH-SIDE) Start the engine and warm it up completely. Access the FUEL_PRES PID using the M-MDS at idle. Refer too ON-BOARD DIAGNOSTIC TEST [PCM (SKYACTIV-G 2.5T)] .) Is the FUEL_PRES PID value approx. 3 MPa {31 kgf/cm ² , 435 psi} ?	Yes	Go to Step 13.
11		No	Lower than 3 MPa {31 kgf/cm ² , 435 psi} : Inspect the following: Fuel leakage at the fuel line and fuel injector Fuel pump Perform the Fuel Pump (Low-pressure Side) Operation Inspection. Refer too ENGINE CONTROL SYSTEM OPERATION INSPECTION [SKYACTIV-G 2.5T] .) Fuel pressure sensor Refer too HIGH FUEL PRESSURE SENSOR INSPECTION [SKYACTIV-G 2.5T] .) Refer too LOW FUEL PRESSURE SENSOR INSPECTION [SKYACTIV-G 2.5T] .) High pressure fuel pump Refer too HIGH PRESSURE FUEL PUMP INSPECTION [SKYACTIV-G 2.5T] .) If there is any malfunction: Repair or replace the malfunctioning part according to the inspection results. If there is no malfunction: Go to the next step. Higher than 3 MPa {31 kgf/cm ² , 435 psi} : Go to the next step.
12	INSPECT SPILL VALVE CONTROL SOLENOID VALVE CONTROL CIRCUIT FOR SHORT TO GROUND Switch the ignition off. Disconnect the high pressure fuel pump and PCM connectors. Inspect for continuity between high pressure fuel pump terminal A (wiring harness-side) and body ground. Is there continuity?	Yes	Refer to the wiring diagram and verify whether or not there is a common connector between high pressure fuel pump terminal A and PCM terminal 1EE. If there is a common connector: Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to ground. Repair or replace the malfunctioning part. If there is no common connector: Repair or replace the wiring harness which has a short to ground. If the malfunction remains: Replace the PCM. (damage to driver in PCM) Refer too PCM REMOVAL/INSTALLATION [SKYACTIV-G 2.5T] .)
12		No	Replace the high pressure fuel pump. Refer too HIGH PRESSURE FUEL PUMP REMOVAL/INSTALLATION [SKYACTIV-G 2.5T] .)
13	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 too FUEL LINE PRESSURE INSPECTION [SKYACTIV-G 2.5T] .) 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.
13		No	Inspect the following: Fuel line restriction Fuel filter clogged If there is any malfunction: Repair or replace the malfunctioning part according to the inspection results. If there is no malfunction: Replace the fuel pump unit. Refer too FUEL PUMP UNIT REMOVAL/INSTALLATION [SKYACTIV-G 2.5T] .)
14	INSPECT THROTTLE BODY FOR CLOGGING Visually inspect the throttle valve. Refer too INTAKE-AIR SYSTEM REMOVAL/INSTALLATION [SKYACTIV-G 2.5T] .) Is any foreign material adhering around the throttle valve?	Yes	Clean the throttle valve.
14		No	Go to the next step.
15	INSPECT WASTEGATE VALVE Switch the ignition off. Inspect wastegate valve actuator. Refer too WASTEGATE VALVE ACTUATOR INSPECTION [SKYACTIV-G 2.5T] .) Is there any malfunction?	Yes	Replace the dynamic pressure turbo. Refer too DYNAMIC PRESSURE TURBO REMOVAL/INSTALLATION [SKYACTIV-G 2.5T] .)
15		No	Go to the next step.
16	INSPECT ENGINE COMPRESSION Measure the compression pressure for each cylinder. Refer too COMPRESSION INSPECTION [SKYACTIV-G 2.5T] .) Are compression pressures within specification?	Yes	Go to Step 22.
16		No	Go to the next step.
17	INSPECT ELECTRIC VARIABLE VALVE TIMING DRIVER Inspect the electric variable valve timing driver. Refer too ELECTRIC VARIABLE VALVE TIMING MOTOR/DRIVER INSPECTION [SKYACTIV-G 2.5T] .) Is there any malfunction?	Yes	Replace the electric variable valve timing motor/driver. Refer too ELECTRIC VARIABLE VALVE TIMING MOTOR/DRIVER REMOVAL/INSTALLATION [SKYACTIV-G 2.5T] .)
17		No	Go to the next step.
18	INSPECT ELECTRIC VARIABLE VALVE TIMING MOTOR Inspect the electric variable valve timing motor. Refer too ELECTRIC VARIABLE VALVE TIMING MOTOR/DRIVER INSPECTION [SKYACTIV-G 2.5T] .) Is there any malfunction?	Yes	Replace the electric variable valve timing motor/driver. Refer too ELECTRIC VARIABLE VALVE TIMING MOTOR/DRIVER REMOVAL/INSTALLATION [SKYACTIV-G 2.5T] .)
18		No	Go to the next step.
19	INSPECT ELECTRIC VARIABLE VALVE TIMING ACTUATOR Inspect the electric variable valve timing actuator. Refer too ELECTRIC VARIABLE VALVE TIMING ACTUATOR INSPECTION [SKYACTIV-G 2.5T] .) Is there any malfunction?	Yes	Replace the electric variable valve timing actuator. Refer too ELECTRIC VARIABLE VALVE TIMING ACTUATOR, HYDRAULIC VARIABLE VALVE TIMING ACTUATOR REMOVAL/INSTALLATION [SKYACTIV-G 2.5T] .)
19		No	Go to the next step.
20	INSPECT HYDRAULIC VARIABLE VALVE TIMING CONTROL SYSTEM OPERATION Perform the Hydraulic Variable Valve Timing Control System Operation Inspection. Refer too ENGINE CONTROL SYSTEM OPERATION INSPECTION [SKYACTIV-G 2.5T] .) Is there any malfunction?	Yes	Repair or replace the malfunctioning part according to the inspection results.
20		No	Go to the next step.
21	INSPECT FOR MALFUNCTION DUE TO DEVIATED VALVE TIMING Inspect the valve timing (timing chain installation condition). Refer too TIMING CHAIN REMOVAL/INSTALLATION [SKYACTIV-G 2.5T] .) 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 part according to the inspection results.
21		No	Adjust the valve timing to the correct timing.
22	VERIFY SPARK PLUG CONDITION Inspect the spark plug condition. Refer too SPARK PLUG INSPECTION [SKYACTIV-G 2.5T] .) Is the spark plug wet, covered with carbon or grayish white?	Yes	Spark plug is wet or covered with carbon: Perform the Spark Test. Refer too ENGINE CONTROL SYSTEM OPERATION INSPECTION [SKYACTIV-G 2.5T] .) Repair or replace the malfunctioning part according to the inspection results. Spark plug is grayish white: Inspect the fuel injector for restriction. Repair or replace the malfunctioning part according to the inspection results.
22		No	Go to the next step.
23	INSPECT THREE WAY SOLENOID VALVE INSPECTION Inspect three way solenoid valve. Refer too THREE WAY SOLENOID VALVE INSPECTION [SKYACTIV-G 2.5T] .) Is there any malfunction?	Yes	Replace the three way solenoid valve. Refer too POSITIVE CRANKCASE VENTILATION (PCV) VALVE REMOVAL/INSTALLATION [SKYACTIV-G 2.5T] .)
23		No	Go to the next step.
24	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 part according to the inspection results.
24		No	Go to the next step.
25	INSPECT IF MALFUNCTION CAUSE IS PCV VALVE OR INJECTOR DRIVER (PCM INTEGRATED) Inspect the PCV valve. Refer too POSITIVE CRANKCASE VENTILATION (PCV) VALVE INSPECTION [SKYACTIV-G 2.5T] .) Is there any malfunction?	Yes	Replace the PCV valve. Refer too POSITIVE CRANKCASE VENTILATION (PCV) VALVE REMOVAL/INSTALLATION [SKYACTIV-G 2.5T] .)
25		No	Injector driver malfunction. Replace the PCM. Refer too PCM REMOVAL/INSTALLATION [SKYACTIV-G 2.5T] .) If the problem remains, overhaul the engine.
26	Verify the test results. If normal, return to the diagnostic index to service any additional symptoms. Refer too SYMPTOM DIAGNOSTIC INDEX [SKYACTIV-G 2.5T] .) 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. Refer too PCM REMOVAL/INSTALLATION [SKYACTIV-G 2.5T] .)