Check Engine Light

[garrycol]

Check Engine Light - Freelander
Hi - I am after some help with a small problem I have with my L series diesel freelander.

The engine is a 4 cylinder diesel with ECU controlled injection pump. The accelerator is fly by wire.

I drove to work OK and at lunch I went to go out and I noticed that on start up, the engine RPM blipped to 1800 then settled back to normal idle of around 850. As the engine revs came back down to idle the 'check engine' light came on. I switched off and went back through the startup routine - on turning on the ignition all the lights did the right thing and went out - which indicates the "fault" is not being stored in the ECU - on starting the engine, exactly the same happens - there is initially no check engine light, the engine starts and immediately blips to 1800rpm and when coming back to idle the "check engine" cames on.

The engine runs OK and will happily drive the car around - covered about 60km at lunch - no problems but the check engine light stays on.

My thoughts are that the blip in RPM is not being generated by the ECU (or the check engine light would come on first) but is being generated by something else (such as the accelerator potentiometer) and the blip in revs is being detected by the the ECU and sending a fault message.

Any ideas as my only real option in Canberra to fix is to take it to the stealer which I am not keen on doing.

Thanks

Garry

[Rovin4life]

without getting a code you cant really know what happened.

[garrycol]

Thanks - I agree but our stealer is the biggest stealer of them all and in Australia you just don't go to another one as they are too far away. So I as the car still runs fine I would prefer to make that the last resort.

There is no problem when the car is cold but the issue returns when the car is warm or hot on start up.

I guess there is a temperature sensor that tells the ecu to give it more juice when cold (like a choke) - my thoughts are this sensor has failed or stuck in the cold position so on hot starts the ECU gives the engine too much fuel - hence the rpm blip and then other sensors pick up the fault and tell the ECU and the check engine light comes on.

As I am really not keen on going to the stealers I will start going through the workshop manual and RAVE looking for a sensor that does this.

Any ideas what and where it might be - I asume there is a similar sensor on other landy diesels.

Cheers

Gazzz

[05LandRover]

This works on my gasoline

drain the battery, leave a dome light on or something. put a slow charge on it overnight, like a 3amp or so... next day start it up and it see what happens. like i said, it worked on my gasoline

[Rovin4life]

doesnt kill the code in the computer. it is always there unless erased or the problem goes away after forty drive cycles.