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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS TSB Revision MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE> 13A-517 Judgement Criteria (change in the angular accel- eration of the crankshaft is used for misfire • Misfire has occurred more frequently than allowed during the last 200 revolutions [when the °C (1742 °F)]. or • Misfire has occurred in 15 or more of the last 1,000 revolutions (corresponding to 1.5 times the or • Misfire has occurred in 10 or more of the last 1,000 revolutions (corresponding to 1.5 times the . OBD-II DRIVE CYCLE PATTERN − OBD-II Drive Cycle − Procedure 6 . . TROUBLESHOOTING HINTS (The most likely • Ignition system related part(s) failed. • Poor crankshaft position sensor. • Incorrect air/fuel ratio. • Low compression pressure. • Skipping of timing belt teeth. • EGR system and EGR valve failed. • PCM failed. DIAGNOSIS Required Special Tools: • MB991958: Scan Tool (MUT-III Sub Assembly) • MB991824: V.C.I. • MB991827: USB Cable • MB991910: Main Harness A STEP 1. Using scan tool MB991958, check data list item 22: CAUTION To prevent damage to scan tool MB991958, always turn the (3) Set scan tool MB991958 to the data reading mode for item 22, Crankshaft Position Sensor. (4) Check the waveform of the crankshaft position sensor while keeping the engine speed constant. • The pulse width should be constant. (5) Turn the ignition switch to the "LOCK" (OFF) position. YES : Go to Step 2. − Crankshaft Position Sensor Circuit AK303804AB MB991910 DATA LINK MB991824 MB991827 |