NO.19 EXHAUST SMOKE [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5]
id0103g8802500
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19 |
EXHAUST SMOKE |
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DESCRIPTION
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• Blue, black, or white smoke from exhaust system.
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POSSIBLE CAUSE
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Blue smoke (Burning oil):
• PCV valve malfunction
• Engine internal oil leakage
White smoke (Water in combustion):
• Cooling system malfunction (coolant loss)
• Engine internal coolant leakage
Black smoke (Rich fuel mixture):
• Erratic signal to PCM
• Improper fuel injection timing and amount
• Air cleaner restriction
• Intake-air system is collapsed or restricted
• Leakage at engine intake manifold and/or exhaust manifold
• Inadequate/Excessive fuel pressure
• Ignition system malfunction
• Improper engine compression
• Improper intake valve timing
• Improper exhaust valve timing
• Injector driver (built-into PCM) malfunction
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Diagnostic Procedure
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STEP |
INSPECTION |
RESULTS |
ACTION |
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1
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VERIFY EXHAUST COLOR
• What color is smoke coming from the exhaust system?
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Blue
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Burning oil is indicated.
• Go to the next step.
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White
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Water in combustion is indicated.
• Go to Step 4.
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Black
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Rich fuel mixture is indicated.
• Go to Step 5.
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2
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INSPECT PCV VALVE
• Inspect the PCV valve.
• Is there any malfunction?
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Yes
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Replace the PCV valve.
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No
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Go to the next step.
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3
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INSPECT ENGINE INTERNAL PARTS
• Inspect for the following engine internal parts:
• Is there any malfunction?
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Yes
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Repair or replace the malfunctioning part according to the inspection results.
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No
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Engine internal parts are normal.
• If other driveability symptoms are present:
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4
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INSPECT ENGINE FOR ENGINE COOLANT LEAKAGE
• Does the cooling system hold the coolant pressure?
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Yes
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Inspect the following:
• Cylinder head gasket leakage
• Intake manifold gasket leakage
• Cracked or porous engine block
Repair or replace the malfunctioning part according to the inspection results.
• If other driveability symptoms are present:
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No
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Inspect for the cause.
Repair or replace the malfunctioning part according to the inspection results.
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5
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VERIFY CURRENT INPUT SIGNAL STATUS
• Access the following PIDs using the M-MDS:
• Monitor the PIDs under the black smoke appeared engine condition.
• Do the PIDs indicate normal according to engine conditions?
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Yes
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Go to the next step.
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No
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APP1, APP2 PIDs are not as specified:
• Inspect the APP sensor.
ECT PID is not as specified:
• Inspect the ECT sensor.
IAT PID is not as specified:
• Inspect the IAT sensor No.1.
MAF PID is not as specified:
• Inspect the MAF sensor.
MAP PID is not as specified:
• Inspect the MAP sensor.
TP_REL PID is not as specified:
• Inspect the TP sensor.
O2S11, SHRTFT1, LONGFT1 PIDs are not as specified:
• Inspect the A/F sensor.
O2S12 PID is not as specified:
• Inspect the HO2S.
Repair or replace the malfunctioning part according to the inspection results.
• If the malfunction remains:
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6
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INSPECT FUEL INJECTOR OPERATION
• Perform the Fuel Injector Operation Inspection.
• Do the fuel injectors operate 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 part according to the inspection results.
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7
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INSPECT INTAKE AIR SYSTEM
• Inspect the following for intake-air system:
• Is there any malfunction?
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Yes
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Repair or replace the malfunctioning part according to the inspection results.
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No
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Go to the next step.
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8
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INSPECT EXHAUST SYSTEM FOR LEAKAGE
• Visually inspect for exhaust gas leakage from exhaust manifold.
• Is there any leakage?
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Yes
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Repair or replace the malfunctioning part according to the inspection results.
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No
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Go to the next step.
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9
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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.
• Is the FUEL_PRES PID value approx. 3 MPa {31 kgf/cm2, 435 psi}?
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Yes
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Go to Step 13.
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No
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Lower than 3 MPa {31 kgf/cm2, 435 psi}:
• Inspect the following:
• If there is any malfunction:
• If there is no malfunction:
Higher than 3 MPa {31 kgf/cm2, 435 psi}:
• Go to the next step.
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10
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DETERMINE IF MALFUNCTION CAUSE IS FUEL PRESSURE SENSOR OR HIGH PRESSURE FUEL PUMP
• Is the vehicle acceleration performance normal?
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Yes
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Go to the next step.
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No
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Go to Step 12.
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11
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INSPECT FUEL PRESSURE SENSOR
• Inspect the fuel pressure sensor.
• Is there any malfunction?
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Yes
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Replace the fuel distributor.
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No
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Go to Step 13.
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12
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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?
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Yes
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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)
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No
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Replace the high pressure fuel pump.
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13
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INSPECT FUEL PRESSURE (LOW-SIDE)
• Connect the fuel pressure gauge between fuel pump and high pressure fuel pump.
• Measure the low side fuel pressure.
• Is the low side fuel pressure within specification?
Specification:
• 405—485 kPa {4.13—4.94 kgf/cm2, 58.8—70.3 psi}
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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:
• Fuel line restriction
• Fuel filter clogged
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14
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INSPECT IGNITION SYSTEM OPERATION
• Perform the Spark Test.
• Is a strong blue spark visible at each cylinder?
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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 part according to the inspection results.
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15
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INSPECT IF MALFUNCTION CAUSE IS ENGINE COMPRESSION OR INJECTOR DRIVER (PCM INTEGRATED)
• Measure the compression pressure for each cylinder.
• Are compression pressures within specification?
Specification:
• Compression [SKYACTIV-G 1.5]
• Compression [SKYACTIV-G 2.0, European (L.H.D. U.K.) specs.]
• Compression [SKYACTIV-G 2.0, Except European (L.H.D. U.K.) specs.]
• Compression [SKYACTIV-G 2.5]
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Yes
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Injector driver malfunction.
• Replace the PCM.
If the problem remains, overhaul the engine.
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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
• Improper intake valve timing
• Improper exhaust valve timing
Service if necessary.
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16
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Verify the test results.
• If normal, return to the diagnostic index to service any additional symptoms.
• If a malfunction remains, inspect the related Service Information and perform the repair or diagnosis.
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