|
|
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS TSB Revision MULTIPORT FUEL INJECTION (MFI) 13A-391 Check Conditions • Engine coolant temperature is higher than 77°C (171 °F). • Under the closed loop air/fuel ratio control. Judgment Criteria • Long-term fuel trim has continued to be −12.5 percent for 5 seconds. or • Short-term fuel trim has continued to be −30.0 percent for 5 seconds. . OBD-II DRIVE CYCLE PATTERN − OBD-II Drive Cycle − Procedure 2 . TROUBLESHOOTING HINTS (The most likely causes for this code to be set are:) • Volume airflow sensor failed. • Injector (Number 2, 4, 6) failed. • Incorrect fuel pressure. • Air drawn in from gaps in gasket, seals, etc. • Right bank heated oxygen sensor failed. • Engine coolant temperature sensor failed. • Intake air temperature sensor failed. • Barometric pressure sensor failed. • Exhaust leak. • Use of incorrect or contaminated fuel. • PCM failed. DIAGNOSIS Required Special Tools: • MB991958: Scan Tool (MUT-III Sub Assembly) • MB991824: V.C.I. • MB991827: USB Cable • MB991911: Main Harness B STEP 1. Using scan tool MB991958, check data list item 12: CAUTION To prevent damage to scan tool MB991958, always turn the (3) Set scan tool MB991958 to the data reading mode for item 12, Volume Airflow Sensor. (4) Warm up the engine to normal operating temperature: 80 °C to 95 °C (176°F to 203°F). • When idling, between 17 and 43 Hz (between 3.5 and 7.5 gm/s). • When 2,500 r/min, between 64 and 104 Hz (between 13.6 and 19.6 gm/s). (5) Turn the ignition switch to the "LOCK" (OFF) position. YES : YES: Go to Step 2. − Volume Airflow Circuit Range/Performance Problem , DTC P0102 − Volume Airflow Circuit Low Input . AK302970 AB MB991911 MB991824 MB991827 |