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MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS TSB Revision MULTIPORT FUEL INJECTION (MFI) <2.4L> 13A-81 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 the sensor output voltage at engine coolant backprobing. • When engine coolant temperature is 0 ° C(32 ° F), voltage should be 3.2 and 3.8 volts. • When engine coolant temperature is 20 ° C(68 ° F), voltage should be 2.3 and 2.9 volts. • When engine coolant temperature is 40 ° C(104 ° F), voltage should be 1.3 and 1.9 volts. • When engine coolant temperature is 80 ° C(176 ° F), voltage should be 0.3 and 0.9 volts. (4) Turn the ignition switch to the "LOCK" (OFF) position. Q: Is the voltage normal? YES : Go to Step 3. STEP 3. Check connector B-13 at the engine coolant YES : Go to Step 4. Connector Inspection ( ). Then go to Step 14. AC003081 AB 16 PIN MB991502 AK000233 B-13 CONNECTOR 1 2 AD ACX02478 CONNECTOR : B-13 AF ENGINE COOLANT |