NO.15 EMISSION COMPLIANCE [MZI-3.7]
id0103d2802100
15 |
EMISSION COMPLIANCE |
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DESCRIPTION
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Fails emissions test.
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POSSIBLE CAUSE
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• Vacuum lines leakage or blockage
• Cooling system malfunction
• Spark plug malfunction
• Leakage from intake manifold
• Erratic or no signal from CMP sensor
• Inadequate fuel pressure
• PCV valve malfunction or incorrect valve installation
• Exhaust system clogging
• Fuel tank ventilation system malfunction
• Charcoal canister damage
• Air cleaner element clogging or restriction
• Throttle body malfunction
• Erratic signal to ignition coil
• Improper air/fuel mixture ratio control operation
• Bend or open circuit HO2S wiring harness
• Catalyst converter malfunction
• Engine internal parts malfunction
• Excessive carbon is built up in combustion chamber
• Improper engine compression
• Improper valve timing
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Diagnostic procedure
STEP |
INSPECTION |
RESULTS |
ACTION |
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1
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Inspect for the following:
• Vacuum lines for leakage or blockage
• Electrical connections
• Proper maintenance schedule followed
• Intake‐air system and air cleaner element concerns: obstructions, leakage or dirtiness
Are all items normal?
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Yes
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Go to the next step.
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No
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Service if necessary.
Repeat Step 1.
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2
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Connect the M-MDS to the DLC-2.
Turn the ignition switch to the ON position (Engine off).
Retrieve any DTCs.
Are there any DTCs displayed?
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Yes
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DTC is displayed:
Go to appropriate DTC inspection.
(See DTC TABLE [MZI-3.7].)
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No
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No DTC is displayed:
Go to the next step.
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3
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Is any other driveability concern present?
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Yes
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Go to appropriate 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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Connect the M-MDS to the DLC-2.
Access ECT PID.
Warm up the engine and idle it.
Verify ECT PID is correct.
(See PCM INSPECTION [MZI-3.7].)
Is ECT PID correct?
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Yes
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Go to the next step.
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No
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Inspect for coolant leakage, cooling fan and condenser fan operation or thermostat operation.
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5
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Inspect the front HO2S.
Is front HO2S normal?
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Yes
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Go to the next step.
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No
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Replace the front HO2S.
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6
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Perform spark test.
Is 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 spark test result.
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7
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Install the fuel pressure gauge between the fuel pipe and the fuel distributor.
Start the engine and idle it.
Measure fuel line pressure during idle.
Is fuel line pressure correct during idle?
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Yes
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Go to the next step.
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No
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Low:
Inspect the fuel line for clogging.
If there is no malfunction, replace the fuel pump unit.
High:
Replace the fuel pump unit.
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8
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Remove and shake the PCV valve.
Does the PCV valve rattle?
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Yes
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Go to the next step.
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No
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Replace the PCV valve.
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9
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Inspect for fuel saturation inside charcoal canister.
Is excess amount of liquid fuel present in canister?
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Yes
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Replace the charcoal canister.
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No
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Inspect the fuel tank vent system.
Then, go to the next step.
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10
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visually inspect the exhaust system part.
Is there any deformed exhaust system part?
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Yes
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Replace the part.
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No
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Go to the next step.
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11
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Inspect the three-way catalytic converter.
Is the three-way catalytic converter normal?
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Yes
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Go to the next step.
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No
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Replace the three-way catalytic converter.
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12
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• Verify test results.
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