Injector 5 Connect ohmmetre between Pin 32 and 87 of main relay Injector 3 Connect ohmmetre between Pin 33 and 87 of main relay Injector 4 Connect ohmmetre between Pin 30and 87 of main relay Injector 2 Connect ohmmetre between Pin 31 and 87 of main relay Injector 8 Connect ohmmetre between Pin 28and 87 of main relay If all are OK you must check the wiring harness and connectors as well as the resistance bloc.Reading below normal: Disconnect one after another the injectors until you find the one with low or 0 resistance.Connect ohmmetre between Pin 14 and 87 of main relay.Normal result: Fluctuates between 6 and 9V No reading: check the connectors between coil and regulator.Connect voltmetre between Pin 1 and ground Make a connestion between - of the coil and Pin 1.Take only short readings as sensor may be damaged by heat from curent from ohmmetre.Differing values: Check cables and connector, change sensor if readings.Connect Ohmmetre between Pin 13and ground.Reading under 8V: check batterie (connect another one) and starterĭiffering values: check cables with ohmmetre, check air metering valve but make sure it's completely closed.No reading and starter does not turn: check starter and starter relay.No reading but starter turns: Check wiring harness from ECU to relay.Connect Voltmetre between Pin 4 and ground.Normal result: 0 V when closed, 11-12.5V when flap moving Check the pump by connecting a wire directly Then from air metre to relay of fuel pump. When moving: No reading: Check wire harness from relay to air metre,.
When closed: Something else than =V when flap closed: check switch on air meter (flap) housing.Connect Voltmetre between Pin 20 and ground.Lower than 11 V: Check cables and connectors for a bad or corroded contact.No reading: Check cables and connectors, check Main relay by substitution of a new unit (this is genuine LR instructions.).Connect Voltmetre between Pin 10 and ground.P= pump relay M=main relay S=steering relay Well damage a component beyond repair if you screw it up. Those who use Lucas ECU box and an Hot Wire to This procedure should be similar on any engines using an flap for Sorry for the sometimes not absolute correct names, text translated from Original from ECU's on Fuel Injected EnginesĪt the example of the 3.9 Range Rover engine #Test Points and diagnostics for Land Rover 3.9 ECU
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