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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS TSB Revision MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE> 13B-75 TECHNICAL DESCRIPTION • The engine coolant temperature sensor converts • The ECM <M/T> or PCM <A/T> checks whether DTC SET CONDITIONS Check Conditions • Two seconds or more have passed since the Judgement Criteria • Engine coolant temperature sensor output ° C (-49 ° F) or lower] for 2 seconds. or • Engine coolant temperature sensor output °
C (284 ° F) or higher] for 2 seconds. TROUBLESHOOTING HINTS (The most likely • Engine coolant temperature sensor failed. • Open or shorted engine coolant temperature • ECM failed. <M/T> • PCM failed. <A/T> DIAGNOSIS Required Special Tools STEP 1. Using scan tool MB991502, check data list item 21: CAUTION To prevent damage to scan tool MB991502, always turn the 21, Engine Coolant Temperature Sensor. • The engine coolant temperature and temperature (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 00, How to Use Troubleshooting/ NO : Go to Step 2. STEP 2. Check connector B-11 at the engine coolant YES : Go to Step 3. Connector Inspection ( AKX01177 16 PIN MB991502 AB ACX02490 CONNECTOR : B-11 ENGINE AC |