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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS TSB Revision MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE> 13A-302 Judgment Criteria • Input voltage supplied to the PCM interface circuit is higher than 4.5 volts when 5 volts is applied to . OBD-II DRIVE CYCLE PATTERN Refer to Diagnostic Function − OBD-II Drive Cycle − Procedure 6 . TROUBLESHOOTING HINTS (The most • Cylinder 2, 3 heated oxygen sensor (front) deteri- orated. • Open or shorted circuit in cylinder 2, 3 heated oxygen sensor (front) output line, or harness • Open circuit in cylinder 2, 3 heated oxygen sen- sor (front) ground line, or harness damage. • Connector damage. • PCM failed. DIAGNOSIS Required Special Tools: • MB991958: Scan tool (MUT-III Sub Assembly) • MB991824: V.C.I. • MB991827: USB Cable • MB991910: Main Harness A • MB991316: Test Harness • MB991923: Power Plant ECU Check Harness STEP 1. Using scan tool MB991958, check data list item 11: CAUTION To prevent damage to scan tool MB991958, always turn the 11, Cylinder 2, 3 Heated Oxygen Sensor (front). • Warming up the engine. When the engine is revved, the output voltage should be 0.6 to 1.0 volt. • Warming up the engine. When the engine is idling, the output voltage should repeat 0.4 volt and 0.6 to 1.0 volt (4) Turn the ignition switch to the "LOCK" (OFF) position. YES : It can be assumed that this malfunction is intermittent. Refer to GROUP 00, How to Use − How to Cope with Intermittent Malfunctions . NO : Go to Step 2. AK303804AB MB991910 DATA LINK MB991824 MB991827 |