EMISSION COMPLIANCE [SKYACTIV-G (US)]
EMISSION COMPLIANCE [SKYACTIV-G (US)]
SM2565588
id0103s48902s6
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Troubleshooting item |
Emission compliance |
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Description
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• Fails emissions test.
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Possible cause
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• Engine overheating
• Cooling system malfunction
• PCM DTC is stored
• Incorrect fuel injection timing
• Incorrect ignition timing
• Purge solenoid valve malfunction
• Inadequate fuel pressure
• Air leakage from intake-air system
• Vacuum lines leakage or blockage
• Charcoal canister main damage (U.S.A. and CANADA)
• Charcoal canister sub damage (U.S.A. and CANADA)
• Charcoal canister damage (Except (U.S.A. and CANADA))
• 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 TWC restriction
• Exhaust gas leakage from exhaust system
• TWC malfunction (PCM DTC is stored.)
• Positive crankcase ventilation system malfunction
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System wiring diagram
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• Not applicable
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Connector diagram
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• Not applicable
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Diagnostic Procedure
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Step |
Inspection |
Results |
Action |
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1
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VERIFY PCM DTC
• Perform the DTC inspection for the PCM. (See DTC INSPECTION.)
• Are any DTCs displayed?
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Yes
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Repair the malfunctioning location according to the applicable DTC troubleshooting.
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No
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Go to the next step.
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2
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VERIFY DRIVE MODE CONDITION
• Verify that the drive mode is completed.
• Is the drive mode completed?
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Yes
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Go to the next step.
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No
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Perform the Drive Mode.
Go to repair completion verification.
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3
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INSPECT FOR ANY OTHER MALFUNCTION
• Can malfunction symptoms other than “EMISSION COMPLIANCE” be verified? (See SYMPTOM DIAGNOSTIC INDEX [SKYACTIV-G (US)].)
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Yes
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Go to the applicable symptom troubleshooting.
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No
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Go to the next step.
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4
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VERIFY CO AND HC CONCENTRATION
• Verify CO and HC concentration.
• Is the CO or HC concentration excessive?
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Yes
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Go to Step 6.
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No
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Go to the next step.
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5
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VERIFY NOx CONCENTRATION
• Verify NOx concentration.
• Is the NOx concentration excessive?
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Yes
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Go to the next step.
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No
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Symptom troubleshooting is completed.
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6
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VERIFY IF MALFUNCTION CAUSED BY IGNITION TIMING MALFUNCTION
• Inspect the ignition timing. (See ENGINE TUNE-UP [SKYACTIV-G (WITH CYLINDER DEACTIVATION (US))].) (See ENGINE TUNE-UP [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (US))].)
• Is there any malfunction?
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Yes
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Inspect the following:
• Spark plug (See SPARK PLUG INSPECTION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (US))].) (See SPARK PLUG INSPECTION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (US))].)
• Ignition coil/ion sensor No.1 (See IGNITION COIL INSPECTION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (US))].) (See IGNITION COIL INSPECTION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (US))].)
• Ignition coil/ion sensor No.2
• Ignition coil/ion sensor No.3
• Ignition coil/ion sensor No.4
• CMP sensor (See CAMSHAFT POSITION (CMP) SENSOR INSPECTION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (US))].) (See CAMSHAFT POSITION (CMP) SENSOR INSPECTION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (US))].)
• CKP sensor (See CRANKSHAFT POSITION (CKP) SENSOR INSPECTION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (US))].) (See CRANKSHAFT POSITION (CKP) SENSOR INSPECTION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (US))].)
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No
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Go to the next step.
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7
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INSPECT PURGE CONTROL SYSTEM OPERATION
• Perform the Purge Control System Inspection. (See PURGE SOLENOID VALVE INSPECTION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (US))].) (See PURGE SOLENOID VALVE INSPECTION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (US))].)
• Does the purge solenoid valve work properly?
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Yes
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Go to the next step.
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No
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Repair or replace the malfunctioning location and perform the repair completion verification.
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8
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INSPECT FUEL PRESSURE (HIGH-SIDE)
• Start the engine and warm it up completely.
• Access the FUEL_PRES PID using the M-MDS at idle. (See PID/DATA MONITOR INSPECTION.)
• Is the FUEL_PRES PID value within specification?
Specification:
• Approx. 10 MPa {102 kgf/cm2, 1450 psi}
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Yes
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Go to the next step.
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No
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Lower than specification:
• Inspect the following:
Higher than specification:
• Inspect the following:
Repair or replace the malfunctioning location and perform the repair completion verification.
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9
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INSPECT INTAKE-AIR SYSTEM FOR AIR LEAKAGE
• Inspect for leakage in intake-air system.
• Is there any leakage?
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Yes
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Repair or replace the malfunctioning location and perform the repair completion verification.
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No
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Go to the next step.
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10
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INSPECT RESTRICTION IN VENTILATION HOSE
• Inspect for restriction in the ventilation hose.
• Is there any restriction?
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Yes
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Repair or replace the malfunctioning location and perform the repair completion verification.
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No
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U.S.A. and CANADA:
• Go to the next step.
Except (U.S.A. and CANADA):
• Go to Step 13.
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11
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VERIFY IF MALFUNCTION CAUSE IS CHARCOAL CANISTER MAIN
• Inspect the charcoal canister main. (See CHARCOAL CANISTER INSPECTION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (US))].) (See CHARCOAL CANISTER INSPECTION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (US))].)
• Is the charcoal canister main damaged?
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Yes
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Repair or replace the malfunctioning location and perform the repair completion verification.
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No
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Go to the next step.
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12
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VERIFY IF MALFUNCTION CAUSE IS CHARCOAL CANISTER SUB
• Inspect the charcoal canister sub. (See CHARCOAL CANISTER INSPECTION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (US))].) (See CHARCOAL CANISTER INSPECTION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (US))].)
• Is the charcoal canister sub damaged?
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Yes
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Repair or replace the malfunctioning location and perform the repair completion verification.
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No
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Go to Step 14.
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13
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VERIFY IF MALFUNCTION CAUSE IS CHARCOAL CANISTER
• Inspect the charcoal canister. (See CHARCOAL CANISTER INSPECTION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (US))].) (See CHARCOAL CANISTER INSPECTION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (US))].)
• Is the charcoal canister damaged?
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Yes
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Repair or replace the malfunctioning location and perform the repair completion verification.
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No
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Go to the next step.
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14
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VERIFY IF MALFUNCTION CAUSED BY LACK OF ENGINE COOLANT
• Inspect the engine coolant level. (See ENGINE COOLANT LEVEL INSPECTION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (US))].) (See ENGINE COOLANT LEVEL INSPECTION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (US))].)
• Is there any malfunction?
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Yes
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Add engine coolant and verify that there is no engine coolant leakage.
• If there is any malfunction:
• If there is no malfunction:
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No
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Go to the next step.
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15
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VERIFY CARBON ACCUMULATION CONDITION IN COMBUSTION CHAMBER
• Verify carbon accumulation condition in combustion chamber.
• Has carbon accumulated?
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Yes
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Repair or replace the malfunctioning location and perform the repair completion verification.
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No
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Go to the next step.
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16
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INSPECT ENGINE COMPRESSION
• Measure the compression pressure for each cylinder. (See COMPRESSION INSPECTION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (US))].) (See COMPRESSION INSPECTION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (US))].)
• Are compression pressures within specification?
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Yes
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Go to the next step.
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No
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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.
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17
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INSPECT TWC FOR RESTRICTION
• Inspect for restriction in the TWC.
• Is there any restriction?
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Yes
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Repair or replace the malfunctioning location and perform the repair completion verification.
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No
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Go to the next step.
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18
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INSPECT EXHAUST SYSTEM FOR LEAKAGE
• Visually inspect for exhaust gas leakage from the exhaust system.
• Is there any malfunction?
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Yes
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Repair or replace the malfunctioning location and perform the repair completion verification.
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No
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Go to the next step.
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19
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INSPECT PCV VALVE FOR MALFUNCTION
• Inspect the applicable part. (See POSITIVE CRANKCASE VENTILATION (PCV) VALVE INSPECTION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (US))].) (See POSITIVE CRANKCASE VENTILATION (PCV) VALVE INSPECTION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (US))].)
• Is the part normal?
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Yes
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Go to the next step.
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No
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Repair or replace the malfunctioning location and perform the repair completion verification.
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Repair completion verification
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VERIFY SYMPTOM TROUBLESHOOTING COMPLETED
• Measure CO, HC, and NOx concentration again.
• Is CO, HC, and NOx concentration within specification?
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Yes
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Complete the symptom troubleshooting. (Explain repair contents to customer)
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No
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Repeat the inspection from Step 1.
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