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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS TSB Revision MULTIPORT FUEL INJECTION (MFI) <2.4L> 13A-217 Judgment Criteria • Input voltage supplied to the ECM <M/T> or PCM <A/T> interface circuit is higher than 4.5 volts . OBD-ll DRIVE CYCLE PATTERN − OBD-ll Drive Cycle − Procedure 6 − Other Monitor . . TROUBLESHOOTING HINTS (The most likely • Heated oxygen sensor (front) deteriorated. • Open or shorted circuit in heated oxygen sensor (front) output line, or harness damage. • Open circuit in heated oxygen sensor (front) ground line, or harness damage. • Connector damage. • ECM failed. <M/T> • PCM failed. <A/T> DIAGNOSIS Required Special Tools: • MB991958 (MUT-III Sub Assembly) • MB991824: V.C.I. • MB991827: USB Cable • MB991911: Main Harness B • MD998464: Test Harness STEP 1. Using scan tool MB991958, check data list item 11: CAUTION To prevent damage to scan tool MB991958, always turn the 11, 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 NO : Go to Step 2. AK300810 AB MB991911 16-PIN MB991827 MB991824 |