PRE-Heat.. 2001 Berlingo Hdi

[bertylingodave]

Winter is here with vengeance in France. Zero degrees was my thermometer's greeting on rising. A very heavy frost indeed this morning and its most definitely 'brass monkey's' weather. Its the first time that the pre-heat light has shown itself. Briefly though, for less than a second. I tried to start three times, and each time the pre-heat light showed for less than a second, and turned off with what sounded like and electronic click. No way was it assisting in preheating the engine for that period of time. I had to wind the starter for a good 5 seconds to get it to start.

As a comparison.. my old V70 Tdi, with the D5252T Audi engine fitted, had its pre heat light on for a good 5 seconds before I started the engine.

Something's not right. Has anybody any ideas? Is there some sort of sensor lurking somewhere that controls the pre-heat on the 2.0 Hdi ?

Many thanks in anticipation..

Dave..

[Sol]

The pre heating stays on a lot longer than the symbol.

[jj9]

As Zion says . . .  the warning lamp means very little on these modern direct injection diesels.

Have you checked if the glow plugs are working?

As for what controls the the pre-heat, I would imagine it's the outside temp sensor that sends a signal to the ECU that sends a signal to the glow plug relay.

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[brodfather11]

The engine temperature has also got an influence on when the glow plugs work.

[jj9]

Yes,  if the coolant temperature is above a set value the glow plugs don't perform a post heat which is normally around 3 minutes. . . The post heat will be cancelled as soon as the coolant reaches the set value.

I believe the post heat operates on every start up regardless of ambient temperature unless the above is in play.

.