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ON-VEHICLE SERVICE TSB Revision ENGINE MECHANICAL <3.8L ENGINE> 11C-10 IDLE MIXTURE CHECK M1111002100750 Required Special Tool: • MB991824: V.C.I. • MB991827: MUT-III USB Cable • MB991910: MUT-III Main Harness A 1. Before inspection, set the vehicle in the following condition: • Engine coolant temperature: 80 − 95°C (176 − 203°F) • Lights and all accessories: OFF • Transmission: P range NOTE: Vehicles for Canada, the headlight, taillight, etc. CAUTION To prevent damage to scan tool MB991958, always turn the value. Standard value: 5 ° BTDC ± 3° 4. Start the engine and increase the engine speed to 2,500 r/min for 2 minutes. 5. Set the CO, HC tester. Standard value: CO contents: 0.5% or less 7. If the CO and HC contents do not remain inside the standard value, check the following items: • Diagnostic output • Closed-loop control (When the closed-loop control is carried out normally, the output signal of the heated oxygen sensor − 400 mV and 600 − 1,000 mV at idle.) • Fuel pressures • Injector • Ignition coil, spark plug • EGR system and EGR valve leak • Evaporative emission system • Compression pressure AC302077 AC306958AB MB991824 MB991910 MB991668 DATA LINK CONNECTOR |