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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS TSB Revision MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE> 13B-237 DTC SET CONDITIONS Logic Flow Chart . Check Conditions • More than 350 seconds have passed since the engine starting sequence was completed. • Engine coolant temperature is higher than 7°C (45 °F). • Engine speed is higher than 1,200 r/min. • Volumetric efficiency is higher than 30 percent. • Throttle position sensor output voltage is lower than 4 volts. • Except while fuel is being shut off. • Monitoring time: 30 seconds. Judgement Criterion • Right bank heated oxygen sensor (front) output voltage does not get across lean/rich criteria . OBD-II DRIVE CYCLE PATTERN Refer to Diagnostic Function − OBD-II Drive Cycle − Pattern 12 . TROUBLESHOOTING HINTS (The most • Right bank heated oxygen sensor (front) deterio- rated. • Harness damage NOTE: When the right bank heated oxygen sensor . • Open circuit in right bank injector. • Connector damage. • Exhaust leak. • Air drawn in from gaps in gasket, seals, etc. • Incorrect fuel pressure. • ECM failed. End No No No Malfunction Good 30secs have passed? AK704112 Start Yes Yes Yes Monitoring Heated oxygen sensor (front) output voltage crosses lean/rich criteria? |