Lancer Evolution L4-2.0L DOHC Turbo (2003)
Air/Fuel Mixture: Testing and Inspection
IDLE MIXTURE CHECK
Required Special Tools:
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MB991502: Scan Tool (MUT-II)
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MB991958: Scan Tool (MUT-III Sub Assembly)
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MB991824: V.I.C.
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MB991827: USB Cable
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MB991911: Main Harness E3
1. Before inspection, set vehicle to the following conditions:
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Engine coolant temperature: 80 - 95°C (176 - 203°F)
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Lights and all accessories: OFF
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Transaxle: Neutral
CAUTION: To prevent damage to scan tool MB991502 or MB991958, always turn the ignition switch to the "LOCK" (OFF) position before
connecting or disconnecting scan tool MB991502 or MB991958.
2. Connect scan tool MB991502 or MB991958 to the data link connector.
3. Confirm basic ignition timing is within the standard value.
Standard value: 5° BTDC ± 3°
4. Increase engine speed to 2,500 r/min for 2 minutes.
5. Set the CO/HC tester.
6. Check the CO and HC contents at idle.
Standard value:
CO contents: 0.5 % or less
HC contents: 100 ppm or less
7. If the CO and HC contents do not remain inside the standard value, check the following items:
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If the MFI system diagnostic trouble code is output
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Closed-loop control (When the closed-loop control is carried out normally, the output signal of the heated oxygen sensor changes between 0 -
400 mV and 600 - 1,000 mV at idle.)
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Fuel pressure injector(s)
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Ignition coil, spark plug cable, spark plug
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EGR system and EGR valve leak
