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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS TSB Revision MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE> 13B-660 DTC SET CONDITIONS . Check Conditions • Engine speed is lower than 3,000 r/min. • Accelerator pedal is open. • Mass airflow is between 9 and 30 g/sec. • More than 3 seconds have elapsed after the above-mentioned three conditions have been • Intake air temperature is higher than −10°C (14 °F). • Barometric pressure is higher than 76 kPa (22.4 in.Hg). • Under the closed loop air/fuel ratio control. • Vehicle speed is 1.5 km/h (1.0 mph) or more. • The PCM monitors for this condition for 7 cycles of 12 seconds each during the drive cycle. • Short-term fuel trim is higher than −30 percent and lower than +25 percent. • The cumulative mass airflow is higher than 1,638 g. Judgment Criteria • When the monitoring for 12 seconds is carried out 7 times, the frequency ratio of rear and front . OBD-II DRIVE CYCLE PATTERN Refer to Diagnostic Function − OBD-II Drive Cycle − Procedure 3 − Catalytic Converter Monitor . . TROUBLESHOOTING HINTS (The most • Right bank side catalytic converter deteriorated. • Right bank heated oxygen sensor failed. • Exhaust leak. • PCM failed. START MONITORING CONDITIONS Rf > R0 MALFUNCTION GOOD END NO NO YES YES CALCULATE AVERAGE FREQUENCY RATIO (Rf = Fr/Ff) OF SPECIFIED TIMES R0: AVERAGE THRESHOLD VALUE. AK303028 |