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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS TSB Revision MULTIPORT FUEL INJECTION (MFI) <3.0L> 13B-471 DTC SET CONDITIONS Logic Flow Chart . Check Conditions • Under the closed loop air/fuel ratio control. • Engine coolant temperature is higher than 77°C (171 °F). • Volume airflow sensor output frequency is 75 Hz or more. Judgment Criteria • Long-term fuel trim has continued to be lower than −12.5 percent for 5 seconds. or • Short-term fuel trim has continued to be lower than −7.4 percent for 5 seconds. Check Conditions • Under the closed loop air/fuel ratio control. • Engine coolant temperature is higher than 77°C (171 °F). • Volume airflow sensor output frequency is 75 Hz or less. Judgment Criteria • Long-term fuel trim has continued to be lower than −12.5 percent for 5 seconds. or • Short-term fuel trim has continued to be lower than −12.5 percent for 5 seconds. K LRN : LONG-TERM TRIM K I : SHORT-TERM TRIM K0 : MAXIMUM LIMIT OF LONG-TERM TRIM START MONITORING CONDITIONS END NO NO NO NO NO NO YES YES YES YES YES YES K LRN > K0 MALFUNCTION GOOD K LRN < K2 K I < K3 K I > K1 CONTINUOUS FAILURE FOR 5secs AK204050 |