|
|
MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS TSB Revision MULTIPORT FUEL INJECTION (MFI) <3.0L> 13B-473 CIRCUIT OPERATION • A battery positive voltage is applied on the fuel • During cranking and while the engine is running, TROUBLESHOOTING HINTS (The most likely • Malfunction of the fuel pump relay. • Malfunction of the fuel pump. • Improper connector contact, open or short- • Malfunction of the PCM. DIAGNOSIS Required Special Tool: STEP 1. Using scan tool MB991502, check actuator test CAUTION To prevent damage to scan tool MB991502, always turn the 07, Fuel Pump. • An operation sound of the fuel pump should be heard. (4) Turn the ignition switch to the "LOCK" (OFF) position. Q: Is the fuel pump operating properly? YES : That this malfunction is intermittent. Refer to GROUP 00, How to Use Troubleshooting/Inspection Service ). NO : Go to Step 2. STEP 2. Check connector D-14 at fuel pump for damage. Q: Is the connector in good condition? YES : Go to Step 3. Connector Inspection ( ). Then confirm that the malfunction symptom is eliminated. STEP 3 Check the fuel pump operation. 5 to the positive battery terminal and terminal 4 to the • An operating sound of the fuel pump should be heard. Q: Is the fuel pump operating properly? YES : Go to Step 4. malfunction symptom is eliminated. |