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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS TSB Revision MULTIPORT FUEL INJECTION (MFI) 13A-217 STEP 2. Measure the sensor output voltage at engine backprobing. • When engine coolant temperature is − 20° C (−4° F), volt- age should be between 3.9 and 4.5 volts. • When engine coolant temperature is 0° C (32° F), volt- age should be between 3.2 and 3.8 volts. • When engine coolant temperature is 20° C (68° F), volt- age should be between 2.3 and 2.9 volts. • When engine coolant temperature is 40° C (104° F), volt- age should be between 1.3 and 1.9 volts. • When engine coolant temperature is 60° C (140° F), volt- age should be between 0.7 and 1.3 volts. • When engine coolant temperature is 80° C (176° F), volt- age should be between 0.3 and 0.9 volt. (4) Turn the ignition switch to the "LOCK" (OFF) position. YES : Go to Step 3. STEP 3. Check harness connector B-08 at the engine YES : Go to Step 4. Connector Inspection . Then go to Step 14. STEP 4. Using scan tool MB991958, check data list item 6: 6, Engine Coolant Temperature Sensor. • The engine coolant temperature and temperature shown with the scan tool should approximately match. (3) Turn the ignition switch to the "LOCK" (OFF) position. YES : It can be assumed that this malfunction is intermittent. Refer to GROUP 00, How to Use Cope with Intermittent Malfunctions . NO : Replace the ECM. When the ECM is replaced, register the ID code. Refer to GROUP 42B, ID Code or GROUP 42C, ID Codes Registration Judgment Table <Vehicles with WCM> AK201572 2 1 AH B-08 harness |