|
|
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS TSB Revision MULTIPORT FUEL INJECTION (MFI) 13A-261 Check Conditions • Engine coolant temperature is higher than 76°C (169 °F). • The right bank heated oxygen sensor (front) is active. • The cumulative volume airflow sensor output fre- quency is higher than 4,000 Hz. • Repeat 3 or more times: drive *1 , stop *2 . Drive *1 : • Engine speed is higher than 1,500 r/min. • Volumetric efficiency is higher than 40 per- cent. • Vehicle speed is higher than 30 km/h (18.7 mph). • A total of more than 10 seconds have elapsed with the above mentioned condi- Stop *2 : • Vehicle speed is lower than 1.5 km/h (0.9mph). Judgement Criteria • Change in the output voltage of the right bank heated oxygen sensor (rear) is lower than 0.313 . OBD-II DRIVE CYCLE PATTERN − OBD-II Drive Cycle − Procedure 4 − Heated Oxygen Sensor Monitor . TROUBLESHOOTING HINTS (The most likely • Right bank heated oxygen sensor (rear) failed. • Connector damage. • PCM failed. DIAGNOSIS Required Special Tools: • MB991958: Scan Tool (MUT-III Sub Assembly) • MB991824: V.C.I • MB991827: USB Cable • MB991911: Main Harness B • MB991316: Test Harness STEP 1. Using scan tool MB991958, check data list item 69: CAUTION To prevent damage to scan tool MB991958, always turn the 69, Heated Oxygen Sensor Bank 1, Sensor 2 (right rear). (4) Warm up the engine. • After increasing the output voltage 0.15 volt or more by the engine revving, finish it. Then confirm that the output (5) 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 NO : Replace the heated oxygen sensor (rear). Then go to AK303629AB MB991911 MB991827 MB991824 16-PIN |