EMISSION COMPLIANCE [SKYACTIV-X]

id0103hf890200

Troubleshooting item

Emission compliance
Description
•  Fails emissions test.
Possible cause
•  Engine overheating
•  Cooling system malfunction
•  PCM DTC is stored
•  Incorrect fuel injection timing
•  Incorrect ignition timing
―  Spark plug malfunction
―  Ignition coil malfunction
―  CMP sensor malfunction
―  CKP sensor malfunction
•  Purge solenoid valve malfunction
•  Inadequate fuel pressure
―  High fuel leakage at the fuel line and/or fuel injector
―  Fuel pressure sensor or related circuit malfunction
―  High pressure fuel pump malfunction
―  Spill valve control solenoid valve control circuit malfunction (damage to driver in PCM caused by short circuit to ground system)
―  Spill valve control solenoid valve malfunction (built-into high pressure fuel pump)
―  Relief valve (built-into high pressure fuel pump) malfunction
―  Fuel line restriction
―  Fuel pump unit malfunction
•  Air leakage from intake-air system
•  Vacuum lines leakage or blockage
•  Charcoal canister damage
•  Improper engine coolant level
•  Excessive carbon built-up in combustion chamber
•  Improper engine compression
•  Improper intake valve timing
•  Improper exhaust valve timing
•  Exhaust system and/or catalytic converter restriction
•  Exhaust gas leakage from exhaust system
•  Catalytic converter (gasoline particulate filter) malfunction (PCM DTC is stored.)
•  Positive crankcase ventilation system malfunction
―  PCV valve malfunction or incorrect valve installation
―  Clogging in positive crankcase ventilation system hoses (PCV valve hose, ventilation hose)
Warning
•  The following troubleshooting flow chart contains the fuel system diagnosis and repair procedures. Read the following warnings before performing the fuel system services:
―  Fuel vapor is hazardous. It can easily ignite, causing serious injury and damage. Always keep sparks and flames away from fuel.
―  Highly pressurized fuel may spray out if the fuel line is cut. Due to the following dangers occurring with a fuel spray, always complete the “Fuel Line Safety Procedure” to prevent the fuel from spraying.
•  Fuel may cause irritation if it comes in contact with skin and eyes.
•  If fuel ignites and causes a fire, it may lead to serious injury or death, and damage to property and facilities.
―  Fuel is highly flammable and dangerous. Fuel line spills and leakage can cause serious injury or death, and damage to equipment. Always refer to the “Quick Release Connector Removal/Installation (fuel system)” before performing the fuel hose installation, and execute the “Fuel Leakage Inspection” after installation.
Caution
•  Disconnecting/connecting the quick release connector without cleaning it may possibly cause damage to the fuel pipe and quick release connector. Always clean the quick release connector joint area before disconnecting/connecting, and make sure that it is free of foreign material.
System wiring diagram
•  Not applicable
Connector diagram
•  Not applicable

Diagnostic Procedure

Step

Inspection

Results

Action
1
VERIFY PCM DTC
•  Perform the DTC inspection for the PCM.
•  Are any DTCs displayed?
Yes
Repair the malfunctioning location according to the applicable DTC troubleshooting.
(See DTC TABLE [PCM (SKYACTIV-X)].)
No
Go to the next step.
2
VERIFY DRIVE MODE CONDITION
•  Verify that the drive mode is completed.
•  Is the drive mode completed?
Yes
Go to the next step.
No
Perform the Drive Mode.
(See OBD DRIVE MODE [PCM (SKYACTIV-X)].)
Go to repair completion verification.
3
INSPECT FOR ANY OTHER MALFUNCTION
•  Can malfunction symptoms other than “EMISSION COMPLIANCE” be verified?
Yes
Go to the applicable symptom troubleshooting.
(See SYMPTOM DIAGNOSTIC INDEX [SKYACTIV-X].)
No
Go to the next step.
4
VERIFY CO AND HC CONCENTRATION
•  Verify CO and HC concentration.
•  Is the CO or HC concentration excessive?
Yes
Go to Step 6.
Note
•  If the HC concentration is normal and the CO concentration is excessive, a rich A/F can be considered the cause.
•  If the CO concentration is normal and the HC concentration is excessive, a A/F lean can be considered the cause.
•  If the CO and HC concentration is excessive, incomplete combustion or a rich A/F can be considered the cause.
No
Go to the next step.
5
VERIFY NOx CONCENTRATION
•  Verify NOx concentration.
•  Is the NOx concentration excessive?
Yes
Go to the next step.
No
Symptom troubleshooting is completed.
6
VERIFY IF MALFUNCTION CAUSED BY IGNITION TIMING MALFUNCTION
•  Inspect the ignition timing.
•  Is there any malfunction?
Yes
Inspect the following:
•  Spark plug
•  Ignition coil No.1
•  Ignition coil No.2
•  Ignition coil No.3
•  Ignition coil No.4
•  CMP sensor
•  CKP sensor
―  If there is any malfunction:
•  Repair or replace the malfunctioning location and perform the repair completion verification.
―  If there is no malfunction:
•  Go to repair completion verification.
No
Go to the next step.
7
INSPECT PURGE CONTROL SYSTEM OPERATION
•  Perform the Purge Control System Inspection.
•  Does the purge solenoid valve work properly?
Yes
Go to the next step.
No
Repair or replace the malfunctioning location and perform the repair completion verification.
8
INSPECT FUEL PRESSURE (HIGH-SIDE)
•  Start the engine and warm it up completely.
•  Access the FUEL_PRES PID using the M-MDS at idle.
•  Is the FUEL_PRES PID value within specification?
Specification:
•  Approx. 40—60 MPa {408—611 kgf/cm2, 5,802—8,702 psi}
Yes
Go to the next step.
No
FUEL_PRES PID value is lower than 40 MPa {408 kgf/cm2, 5,802 psi}:
•  Inspect the following:
―  Fuel leakage at the fuel line and fuel injector
―  Fuel pump
•  Perform the Fuel Pump (Low-pressure Side) Operation Inspection.
―  High fuel pressure sensor
―  High pressure fuel pump
FUEL_PRES PID value is higher than 60 MPa {611 kgf/cm2, 8,702 psi}:
•  Inspect the following:
―  Fuel line and fuel injector restriction
―  High fuel pressure sensor
―  High pressure fuel pump (Relief valve clogged)
Repair or replace the malfunctioning location and perform the repair completion verification.
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.
No
Go to the next step.
10
INSPECT RESTRICTION IN VENTILATION HOSE
•  Inspect for restriction in the ventilation hose.
•  Is there any restriction?
Yes
Repair or replace the malfunctioning location and perform the repair completion verification.
No
Go to the next step.
11
VERIFY IF MALFUNCTION CAUSE IS CHARCOAL CANISTER
•  Inspect the charcoal canister.
•  Is the charcoal canister damaged?
Yes
Repair or replace the malfunctioning location and perform the repair completion verification.
(See CHARCOAL CANISTER REMOVAL/INSTALLATION [SKYACTIV-X 2.0 (E)].)
No
Go to the next step.
12
VERIFY IF MALFUNCTION CAUSED BY LACK OF ENGINE COOLANT
•  Inspect the engine coolant level.
•  Is there any malfunction?
Yes
Add engine coolant and verify that there is no engine coolant leakage.
(See ENGINE COOLANT REPLACEMENT [SKYACTIV-X 2.0].)
(See ENGINE COOLANT LEAKAGE INSPECTION [SKYACTIV-X 2.0].)
•  If there is any malfunction:
―  Repair or replace the malfunctioning location and perform the repair completion verification.
•  If there is no malfunction:
―  Go to repair completion verification.
No
Go to the next step.
13
VERIFY CARBON ACCUMULATION CONDITION IN COMBUSTION CHAMBER
•  Verify carbon accumulation condition in combustion chamber.
•  Has carbon accumulated?
Yes
Repair or replace the malfunctioning location and perform the repair completion verification.
No
Go to the next step.
14
INSPECT ENGINE COMPRESSION
•  Measure the compression pressure for each cylinder.
•  Are compression pressures within specification?
Yes
Go to the next step.
No
Inspect the following:
•  Damaged valve seat
•  Worn valve stem and valve guide
•  Worn or stuck piston ring
•  Worn piston, piston ring or cylinder
•  Such as cylinder head gasket
•  Improper intake valve timing
•  Improper exhaust valve timing
Repair or replace the malfunctioning location and perform the repair completion verification.
15
INSPECT CATALYTIC CONVERTER FOR RESTRICTION
•  Inspect for restriction in the catalytic converter.
•  Is there any restriction?
Yes
Repair or replace the malfunctioning location and perform the repair completion verification.
(See CATALYTIC CONVERTER (GPF) REMOVAL/INSTALLATION [SKYACTIV-X 2.0].)
No
Go to the next step.
16
INSPECT EXHAUST SYSTEM FOR LEAKAGE
•  Visually inspect for exhaust gas leakage from the exhaust system.
•  Is there any malfunction?
Yes
Repair or replace the malfunctioning location and perform the repair completion verification.
No
Go to the next step.
17
INSPECT PCV VALVE FOR MALFUNCTION
•  Inspect the applicable part.
•  Is the part normal?
Yes
Go to the next step.
No
Repair or replace the malfunctioning location and perform the repair completion verification.
(See POSITIVE CRANKCASE VENTILATION (PCV) VALVE REMOVAL/INSTALLATION [SKYACTIV-X 2.0].)
Repair completion verification
VERIFY SYMPTOM TROUBLESHOOTING COMPLETED
•  Measure CO, HC, and NOx concentration again.
•  Is CO, HC, and NOx concentration within specification?
Yes
Complete the symptom troubleshooting. (Explain repair contents to customer)
No
Repeat the inspection from Step 1.