Diagnostic Procedure

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EXHAUST SMOKE (PYUL) DIAGNOSTIC PROCEDURE

Step	Inspection	Results	Action
1	VERIFY EXHAUST COLOR What color is smoke coming from the exhaust system?	Blue	Burning oil is indicated. Go to the next step.
		White	Water in combustion is indicated. Go to Step 4.
		Black	Rich fuel mixture is indicated. Go to Step 5.
2	VERIFY PCV VALVE FOR MALFUNCTION Inspect the applicable part. (Refer to [POSITIVE CRANKCASE VENTILATION (PCV) VALVE INSPECTION ] in Service Information). Is the part normal?	Yes	Go to the next step.
2		No	Repair or replace the malfunctioning location and perform the repair completion verification 1. (Refer to [POSITIVE CRANKCASE VENTILATION (PCV) VALVE REMOVAL/INSTALLATION ] in Service Information).
3	INSPECT ENGINE INTERNAL PARTS Inspect for the following engine internal parts: Cylinder Piston ring Intake valve Exhaust valve Such as cylinder head gasket Is there any malfunction?	Yes	Repair or replace the malfunctioning location and perform the repair completion verification 1.
3		No	Engine internal parts are normal. If other driveability symptoms are present: Perform symptom troubleshooting following the applicable symptom troubleshooting procedure. (See SYMPTOM TROUBLESHOOTING [PYUL] ).
4	VERIFY SEALING OF ENGINE UNIT Verify that there is no engine coolant leakage. (Refer to [ENGINE COOLANT LEAKAGE INSPECTION ] in Service Information). Is the sealing of engine unit normal?	Yes	Inspect the following: Cylinder head gasket leakage Intake manifold gasket leakage Cracked or porous engine block If there is any malfunction: Repair or replace the malfunctioning location and perform the repair completion verification 1. If there is no malfunction: If other driveability symptoms are present: Perform symptom troubleshooting following the applicable symptom troubleshooting procedure. (See SYMPTOM TROUBLESHOOTING [PYUL] ).
4		No	Repair or replace the malfunctioning location and perform the repair completion verification 1.
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: (See PID/DATA MONITOR INSPECTION .) PCM: APP1 APP2 ECT ECT_VOLT IAT MAF MAP MAP_VOLT TP1 TP2 A/F_SEN_CUR HO2S_OUT_VOLT SHRT_FUEL_TRIM LONG_FUEL_TRIM Monitor the PIDs under the black smoke appeared engine condition. Do the PIDs indicate normal according to engine conditions? (See PID/DATA MONITOR TABLE [PCM (PYUL)] .)	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 ] in Service Information). ECT, ECT_VOLT PIDs are not as specified: Inspect the ECT sensor. (Refer to [ENGINE COOLANT TEMPERATURE (ECT) SENSOR INSPECTION ] in Service Information). IAT PID is not as specified: Inspect the IAT sensor No. 1. (Refer to [INTAKE AIR TEMPERATURE (IAT) SENSOR INSPECTION ] in Service Information). MAF PID is not as specified: Inspect the MAF sensor. (Refer to [MASS AIR FLOW (MAF) SENSOR INSPECTION ] in Service Information). MAP, MAP_VOLT PIDs are not as specified: Inspect the MAP sensor. (Refer to [MANIFOLD ABSOLUTE PRESSURE (MAP) SENSOR INSPECTION ] in Service Information). TP1, TP2 PIDs are not as specified: Inspect the TP sensor. (Refer to [THROTTLE POSITION (TP) SENSOR INSPECTION ] in Service Information). 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 ] in Service Information). HO2S_OUT_VOLT PID is not as specified: Inspect the HO2S. (Refer to [HEATED OXYGEN SENSOR (HO2S) INSPECTION ] in Service Information). Repair or replace the malfunctioning location. If the malfunction remains: Perform the [Action for Non-repeatable Malfunction] procedure. (See TROUBLESHOOTING PROCEDURE .)
6	INSPECT FUEL INJECTOR OPERATION Perform [Fuel Injector Operation Inspection]. (Refer to [FUEL INJECTOR INSPECTION ] in Service Information). Do the fuel injectors operate properly?	Yes	Go to the next step.
6		No	Repair or replace the malfunctioning location and perform the repair completion verification 1.
7	VERIFY INTAKE AIR SYSTEM FOR MALFUNCTION Inspect the following for intake-air system: Air cleaner restriction Intake-air system is collapsed or restricted Leakage at engine intake manifold Is there any malfunction?	Yes	Repair or replace the malfunctioning location and perform the repair completion verification 1.
7		No	Go to the next step.
8	VERIFY EXHAUST SYSTEM FOR LEAKAGE Visually inspect for exhaust gas leakage from exhaust manifold. Is there any malfunction?	Yes	Repair or replace the malfunctioning location and perform the repair completion verification 1.
8		No	Go to the next step.
9	INSPECT FUEL PRESSURE (HIGH-SIDE) Start the engine and warm it up completely. Access the PCM PID [FUEL_PRES] using the M-MDS at idle. (See PID/DATA MONITOR INSPECTION .) Is the PID value within specification? Specification: Approx. 10 MPa {102 kgf/cm² , 1450 psi}	Yes	Go to Step 13.
9		No	Lower than specification: Inspect the following: Fuel leakage at the fuel line and fuel injector Fuel pump Perform [Fuel Pump (Low-pressure side) Operation Inspection]. (Refer to [HIGH PRESSURE FUEL PUMP INSPECTION ] in Service Information). Fuel pressure sensor (Refer to [FUEL PRESSURE SENSOR INSPECTION ] in Service Information). High pressure fuel pump (Refer to [HIGH PRESSURE FUEL PUMP INSPECTION ] in Service Information). 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 Step 12. Higher than specification: Go to the next step.
10	DETERMINE IF MALFUNCTION CAUSE IS FUEL PRESSURE SENSOR OR HIGH PRESSURE FUEL PUMP Is the vehicle acceleration performance normal?	Yes	Go to the next step.
10		No	Go to Step 12.
11	VERIFY FUEL PRESSURE SENSOR FOR MALFUNCTION Inspect the applicable part. (Refer to [FUEL PRESSURE SENSOR INSPECTION ] in Service Information). Is the part normal?	Yes	Go to Step 13.
11		No	Replace the fuel distributor and perform the repair completion verification 1. (Refer to [FUEL INJECTOR REMOVAL/INSTALLATION ] in Service Information).
12	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 REMOVAL/INSTALLATION ] in Service Information).
12		No	Repair or replace the malfunctioning location and perform the repair completion verification 1.
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 to [FUEL LINE PRESSURE INSPECTION ] in Service Information). Is the low side fuel pressure within specification? Specification: 475-555 kPa {4.85-5.65 kgf/cm² , 68.9-80.4 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 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 ] in Service Information).
14	INSPECT IGNITION SYSTEM OPERATION NOTE: Because the malfunction may have been resolved by removing the carbon adhered to the spark plug during the spark inspection for the spark plug, verify that the repairs have been completed. Perform the Spark Test. (Refer to [SPARK INSPECTION ] in Service Information). Is a strong blue spark visible at each cylinder?	Yes	Go to the next step.
14		No	Repair or replace the malfunctioning location and perform the repair completion verification 1.
15	INSPECT ENGINE COMPRESSION Measure the compression pressure for each cylinder. (Refer to [COMPRESSION INSPECTION ] in Service Information). Are compression pressures within specification?	Yes	Injector driver malfunction. Replace the PCM. (Refer to [PCM REMOVAL/INSTALLATION ] in Service Information). If the problem remains, overhaul the engine and perform the repair completion verification 1.
15		No	Inspect for the following engine internal parts: Cylinder Piston ring Improper intake valve timing Improper exhaust valve timing Such as cylinder head gasket If there is any malfunction: Repair or replace the malfunctioning location 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 ] in Service Information).