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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS TSB Revision MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE> 13B-389 STEP 6. Using the oscilloscope, check the No. 6 cylinder connect the test harness special tool (MB991658) between (2) Connect the oscilloscope probe to the injector side connector terminal No. 2. (3) Start the engine and run at idle. (4) Measure the waveform. • The waveform should show a normal pattern similar to the illustration. (5) 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 − How to Cope with Intermittent Malfunctions . NO : 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 STEP 7. Test the OBD-II drive cycle. Diagnostic Function − OBD-II Drive Cycle − Pattern 22 (2) Check the diagnostic trouble code (DTC). YES : Retry the troubleshooting. AK700557 1 2 AB Injector connector MB991658 Oscilloscope AK700301 Normal waveform A: Injector drive time A AB |