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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS TSB Revision MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE> 13B-368 Check Conditions • 3 minutes or more have passed since the engine starting sequence was completed. • Left bank heated oxygen sensor (rear) signal voltage has continued to be 0.15 volt or lower. • Engine coolant temperature is higher than 76°C (169 °F). • Engine speed is higher than 1,200 r/min. • Volumetric efficiency is higher than 25 percent. • Monitoring time: 7 seconds. 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 • Left bank heated oxygen sensor (rear) failed. • Open or shorted circuit in left bank heated oxy- gen sensor (rear) output line, or harness dam- • Open circuit in left bank heated oxygen sensor (rear) 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 59: CAUTION To prevent damage to scan tool MB991958, always turn the (3) Set scan tool MB991958 to the data reading mode for item 59, Heated Oxygen Sensor Bank 2, Sensor 2 (left rear). • Warming up the engine. When the engine is revved, the output voltage should repeat 0 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. AC305412 AB MB991910 DATA LINK CONNECTOR MB991824 MB991827 |