2002 Laguna 2.2 DCI wont start

[ukcliff]

Hi all,

I purchased a Laguna 2.2dci last week, and went to start it this morning, It turns but won't fire,
I have the red stop management light on at the moment, I've checked the battery terminals, nice and clean, and Ive checked battery voltage, 12.6,

Anyone got any info that could help?

[Peter.N.]

Possibly a immobiliser problem, do you have another key? If so try that.

Peter

[ukcliff]

Just the one key, its unlocking and the immobilizer light is going off

[ukcliff]

Car starts from a jump,

[Peter.N.]

If you can jump start it then I would say its not turning over fast enough or the voltage is dropping to much to sustain injection, most likely a failing battery. The open circuit voltage doesn't mean a thing, check the voltage while you are cranking it

Peter

[spider]

I agree.

You need a decent cranking speed, I realise this is the Renault system however I would expect it to be similar in that the injectors will not be signalled if the engine rpm is too low. Although this quoted text is for a HDi again, it may assist:

The starting phase is entered as soon as the injection ECU is energised.
When starting, the injection ECU controls the following elements :
Booster pump (low pressure) (cuts out after 3 seconds, if the starter motor does not crank).
Preheater plugs (if necessary).
Fuel high pressure regulator (rise in pressure).

As soon as the starter motor is operated, the injection ECU sets the value of fuel high pressure from the coolant temperature.

At the beginning of starting, the high pressure regulator is controlled by the OCR worked out by the starting cartographic map.

In this operating phase, the high pressure fuel sensor is ignored.
The fuel high pressure is regulated by one of the parameters below :
Engine speed greater than 20 rpm with at least 4 revolutions completed.
Pressure in the high pressure fuel common injection rail greater than 150 bar.

The starting phase is finished when the engine speed exceeds a value.

This may also help > http://frenchcarforum.co.uk/forum/viewt ... 11&t=43319 , do not forget to check the heavy leads at their 'other' ends not just the battery ends.