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MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS TSB Revision MULTIPORT FUEL INJECTION (MFI) <3.0L> 13B-257 • Barometric pressure is higher than 76 kPa (11 • Vehicle speed is 30 km/h (18.7 mph) or more. • At least ninety seconds have passed since • The throttle valve is closed. • Volumetric efficiency is lower than 28 percent. • Monitoring time: 2 seconds. Judgement Criteria • The intake manifold pressure fluctuations are • Three monitors during one drive cycle TROUBLESHOOTING HINTS (The most likely • EGR valve does not open. • EGR control vacuum is too low. • EGR solenoid failed. • Open or shorted EGR solenoid circuit, or loose • Manifold differential pressure sensor failed. • PCM failed. DIAGNOSIS Required Special Tools STEP 1. Check the EGR system − Exhaust Gas Recirculation (EGR) System - EGR System Check ( ). Q: Are there any abnormalities? YES : Go to Step 2. STEP 2. Using scan tool MB991502, check data list item 95: CAUTION To prevent damage to scan tool MB991502, always turn the 95, Manifold Differential Pressure Sensor. (4) Warm up the engine to normal operating temperature: 80 °
C to 96 ° C(176 ° F to 205 ° F). • Should be between 62 − 76 kPa at engine idling. (5) Turn the ignition switch to the "LOCK"(OFF) position. Q: Is the sensor operating properly? YES : Clean the EGR valve and EGR passage. Then go to Step 3. NO : Refer to, DTC P1400 − Manifold Differential Pressure Sensor Circuit Malfunction( STEP 3. Test the OBD-II drive cycle. Procedure 5 − Exhaust Gas Recirculation (EGR) System Monitor( ). (2) Check the diagnostic trouble code (DTC). Q: Is the DTC P0401 is output? YES : Retry the troubleshooting. AC003081 AB 16 PIN MB991502 |