NO.15 EMISSION COMPLIANCE [MZR 1.8, MZR 2.0, MZR 2.5]
id0103d4802100
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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• Electrical connector disconnection
• Intake air system and air cleaner element malfunction
• Vacuum lines leakage or blockage
• PCM DTC is stored
• Cooling system malfunction
• Fuel-filler cap malfunction
• A/F sensor malfunction
• Spark plug malfunction
• Improper operation of ignition system
• Erratic or no signal from CMP sensor
• Excessive or insufficient fuel pressure
• Charcoal canister malfunction
• Exhaust system clogging
• TWC malfunction
• EGR system malfunction
• Base engine malfunction
• Improper engine compression
• Improper valve timing
• PCV valve malfunction
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Diagnostic procedure
STEP |
INSPECTION |
RESULTS |
ACTION |
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1
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Inspect the following:
• Electrical connections
• Intake air system and air cleaner element concerns: obstructions, leakage or soiling
• Proper maintenance schedule followed
• Vacuum lines for leakage or blockage
Is there any malfunction?
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Yes
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Repair or replace the malfunctioning part according to the inspection results.
Repeat Step 1.
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No
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Go to the next step.
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2
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Perform the PCM DTC inspection using the M-MDS.
Are any DTCs present?
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Yes
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Go to the applicable DTC inspection.
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No
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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 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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Access the ECT PID using the M-MDS.
Drive the vehicle while monitoring the ECT PID.
Is the ECT PID value within the 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:
• Coolant leakage
• Cooling fan and condenser fan operation
• Thermostat operation
Repair or replace the malfunctioning part according to the inspection results.
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5
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Inspect the fuel-filler cap.
Is there any leakage at the fuel-filler cap?
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Yes
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Replace the fuel-filler cap.
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No
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Go to the next step.
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6
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Inspect the A/F sensor.
Is there any malfunction?
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Yes
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Inspect for followings:
• Exhaust gas leakage between exhaust manifold and A/F sensor
• Loose installation of A/F sensor
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No
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Go to the next step.
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7
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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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8
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Inspect the fuel line pressure.
Is there any malfunction?
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Yes
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Zero or low:
• Inspect the fuel pump relay and the fuel pump circuit.
(See RELAY INSPECTION.)
• Inspect the fuel line for clogging.
High:
• Replace the fuel pump unit.
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No
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Go to the next step.
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9
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Inspect for fuel saturation inside the charcoal canister.
Is there an 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 parts.
Are there any deformed exhaust system parts?
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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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11
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Inspect the TWC.
Is there any malfunction?
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Yes
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Replace the TWC.
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No
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Go to the next step.
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12
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Perform the EGR Control System Inspection.
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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13
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Inspect the engine compression.
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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14
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Inspect the PCV valve.
Is there any malfunction?
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Yes
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Replace the PCV valve and the oil separator as a single unit, then go to the next step.
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No
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Inspect the valve timing.
Repair or replace the malfunctioning part according to the inspection results.
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15
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Verify test results.
• If normal, return to the diagnostic index to service any additional symptoms.
• If the malfunction remains, inspect the related Service Information and perform the repair or diagnosis.
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