tune resistor testing

hi landrover discovery1 1994 3.9v8. has anyone have any idea how i can test a tune resistor as after months looking for it i now found it. i have the white one fitted but dont know how to test it. would be good if someone knows how.thanks

The clue is in the name, its literally a resistor. You can check the resistance with any good multimeter by turning it to the correct ohms setting.

White 3900 Ohms - USA and European vehicles with catalytic converters
Green 470 Ohms - UK and European vehicles without catalytic converters
Yellow 910 Ohms - Saudi vehicles (without catalytic converters.)
Red 180 Ohms - Australia and "the rest of the world."

White 3900 Ohms - USA and European vehicles with catalytic converters
Green 470 Ohms - UK and European vehicles without catalytic converters
Yellow 910 Ohms - Saudi vehicles (without catalytic converters.)
Red 180 Ohms - Australia and "the rest of the world."[/QUOTE]

hi i have a decent multimeter but not sure which ohms setting to set it on. plus do i just disconnect the tune resistor and put prongs on the 2 connectors then should i have 3900ohms.and i take it anything lower its fooked.

With my multimeter it has a 200ohm, 2kohm, 20kohm, 2M ohm.. settings... etc

So if yours is similar then I'd put it on the 20k ohm setting. That way it measures up to 20,000 ohms and will be within your tune resistor.

I don't know the limits for the ECU are but even if its within say 10% or so that should be fine. So between 3.51kohms and 4.29kohms and you should be okay.

Unless you've put a silly high voltage over the resistor and burnt it out then it should be fine.

Hi just done the test and measured 3.91 ohms so that looks ok. thanks for that info.