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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS TSB Revision MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE> 13B-351 DTC SET CONDITIONS Check Conditions • Two seconds or more have passed the starting • The throttle valve is opener than its idling • Engine speed is at between 2,100 and 4,000 r/ • Volumetric efficiency is at between 40 and 70 Judgement Criteria • Vehicle speed sensor output voltage has not TROUBLESHOOTING HINTS (The most likely • Vehicle speed sensor failed. • Open or shorted vehicle speed sensor circuit, or • ECM failed. DIAGNOSIS Required Special Tools STEP 1. Using scan tool MB991502, check data list item 24: CAUTION To prevent damage to scan tool MB991502, always turn the 24, Vehicle Speed Sensor. • Check that the speedometer and MUT-II display speed (4) Turn the ignition switch to the "LOCK" (OFF) position. Q: Is the sensor operating properly? YES : It can be assumed that this malfunction is intermittent. Refer to GROUP 0, How to Use Troubleshooting/ NO : Go to Step 2. STEP 2. Check speed meter. Q: Is the speed meter functioning? YES : Go to Step 3. AKX01177 16 PIN MB991502 AB |