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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS TSB Revision MULTIPORT FUEL INJECTION (MFI) <3.0L> 13B-1091 Standard Wave Pattern Wave Pattern Observation Points Point B: Injector drive time 1. The injector drive time should be synchronized with the scan tool tester display. 2. When the engine is suddenly revved, the drive time will be greatly extended at first, but the drive time will soon return Observation conditions Function Special pattern Pattern height Variable Variable knob Adjust while viewing the Pattern selector Display Engine r/min Idle speed CONTRAST WITH STANDARD PROBABLE CAUSE Injector coil induced voltage is Short in the injector AKX01604 (V) 50 0 DRIVE SIGNAL:"ON" POINT B: POINT A DRIVE SIGNAL:"OFF" POWER VOLTAGE INJECTION COIL INDUCED AB Standard wave pattern AKX01605 WHEN IDLING WHEN RACING AB |