Tacho freaking out then won't idle

[Yendor]

Mine is A 2005 td inter-cooled .. I have been looking for a Description of the injection system . It has one injector with A wire on it ! the Tacho is intermittent thanks to all

With your vehicle start by swapping the ECU relay. It's located above the fusebox inside the vehicle. You will need to remove the plastic trim above the pedals to see it.

The ECU relay is the top relay. Just swap it for now with the middle relay (interior fan).

Also check and clean the main ECU earths. They are connected to the engine inlet manifold about half way down the engine on the RHS.

[Tip12345]

The very top one in the middle . ? Have been mucking around and now have a light for the aux tank on and switch for the aux tank does not work . It's driving me mad.

[Yendor]

The very top one in the middle . ? Have been mucking around and now have a light for the aux tank on and switch for the aux tank does not work . It's driving me mad.

The ECU relay is the top relay. If your vehicle is a wagon it will more then likely be on the LHS.

The middle relay is for the interior fan. Just swap these two relays over.

Disconnect your batteries for half an hour should reset the sub tank module.

[nissannewby]

The very top one in the middle . ? Have been mucking around and now have a light for the aux tank on and switch for the aux tank does not work . It's driving me mad.

Have you inspected the wiring for any rubbing or breakages?

[Tip12345]

Yes have had a look but wires look good . It is a very tidy Ute has not been touched very clean and tidy that's why I bought it. Stock as a rock

[nissannewby]

I have only really seen these play up when the wiring has been damaged. The rpm sensor is a 3 wire sensor with shielding so if has rubbed anywhere interference can play its part. Or someone has put some pressure on the ecu plug possibly running extra wires through the cab. I would be trying yendors suggestion first though.

[Tip12345]

Thanks where is the sensor located . When I know I can have another look. This Ute is new to me still finding my way around it ..

[Tip12345]

Thanks where is the sensor located . When I know I can have another look. This Ute is new to me still finding my way around it ..

well is is improving but .... This morning without the plastic around the fuse box. I noticed a ticking like a relay opening and shutting. it stopped and the Tacho started working .
Not sure which relay it was .

[Tip12345]

well its still not 100 % when the tacho does not work it does not run properly . It has a three wire sensor . Is there a way to test the sensor . I have been looking for a description of how the system works but cant find anything useful ....
hope every one has had a bit of a break .. back at work here flat out .