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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS TSB Revision MULTIPORT FUEL INJECTION (MFI) 13A-385 TROUBLESHOOTING HINTS (The most • Knock sensor failed. • Open or shorted knock sensor circuit or connec- tor damage. • ECM failed. DIAGNOSIS STEP 1. Check harness connector B-14 at the knock YES : Go to Step 2. Connector Inspection . Then go to Step 5. STEP 2. Check for open circuit between knock sensor YES : Go to Step 3. STEP 3. Check for open circuit and short circuit to ground YES : Go to Step 4. STEP 4. Replace the knock sensor. YES : Replace the ECM. When the ECM is replaced, register the ID code. Refer to GROUP 42B, Diagnosis or GROUP 42C, Diagnosis − ID Codes Registration Judgment Table <Vehicles with . Then go to Step 5. NO : Replace the knock sensor. Then go to Step 5. STEP 5. Test the OBD-II drive cycle. Diagnostic Function − OBD-II Drive Cycle − Pattern 23 (2) Check the diagnostic trouble code (DTC). YES : Retry the troubleshooting. |