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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS TSB Revision MULTIPORT FUEL INJECTION (MFI) 13A-233 DTC SET CONDITION . Check Conditions • 2 seconds or more have passed since the engine starting sequence was completed. • Heated oxygen sensor offset voltage is between 0.4 and 0.6 volt. Judgement Criterion • Heated oxygen sensor (front) output voltage has continued to be 1.8 volts or higher for 2 seconds. . FAIL-SAFE AND BACKUP FUNCTION • None . OBD-II DRIVE CYCLE PATTERN Refer to Diagnosis Function − OBD-II Drive Cycle − Pattern 23 . . TROUBLESHOOTING HINTS (The most • Short circuit in heated oxygen sensor (front) out- put line. • Connector damage. End Malfunction No No No 2secs have passed? Output voltage > 1.8V Good AK604322 Start Yes Yes Yes Monitoring |