Question about Renault 181

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On '02 reg Renault Scenic diesel, when climbing a hill with the car loaded, the "heater plugs on" lamp lights and the engine loses power. Can still change down and continue. Once over hill, light goes out, normal performance.

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  • Dave Reid Aug 06, 2010

    Thanks, I have had the car checked, it produced Renault fault codes P1808, P1886, P1814, P1826, but haven't been able to find a decode for them. The car doesn't stay in 'Limp Home' mode as I said, it recovers while still running and continues normally without being switched of, so may be a glow plug. Can you decode these renault codes?

  • Dave Reid Aug 06, 2010

    This sounds good, I will get the local garage to cheeck them, thanks.

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Hi. The light will indicate that one or more of the installed glow plugs are malfunctioning under load. When you accelerate up hill, this is equivalent to a load that the engine will need to provide power for to achieve the Ascension. During this action, the plug(s) are in great demand to produce the exact heated situation to provide proper combustion, thus, creating the necessary power needed for proper movement of this vehicle. When a glow plug malfunctions, this will cause the engine to stumble and lose power. Usually, the light will illuminate shortly after the fault has been discovered by the engine computer. The necessary actions are to replace the affected glow plug(s). Once you have replaced the Glow plug the is defective, the vehicle will return to its normal performance rate.

The easiest way to isolate the affected glow plug will be to have a diagnostic scan administered on the engine CPU. The scan read out will identify the affected plug(s) and isolate their location for removal.

Posted on Aug 06, 2010

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  • Michael Masters
    Michael Masters Aug 06, 2010

    I will return will all the definition to the codes you posted, asap. One moment please...

  • Michael Masters
    Michael Masters Aug 06, 2010

    The codes and their respective definitions are listed below:

    P1808 - camshaft to crankshaft Hall generator camshaft fault
    P1886 - 4x4 Initialization failure
    P1814 - Transmission 4-wheel drive mode select short to battery
    P1826 - Transmission 4-wheel drive clutch relay short circuit to battery

  • Dave Reid Aug 06, 2010

    Many thanks, will try the glo-plug first.

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  • Master
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There is an an engine problem and it goes into limp mode while climbing hill thats why it looses power .you need to get the glow plugs changed as at least one of them is not squirting enough diesel through the system,this will cause the car to go into limp mode. There are several ( or more ) things that this could be... Basically on the Renault the glow/heater plugs light acts as a fault light for the main Ecu ( computer ) - sometimes the "ser" light comes on with it too...
Whats happening here is that whilst running the fault , whatever it is occurs - the ecu detects this - and then puts the light on as you mention. Now, either the engine runs at reduced power output because of the fault itself - or the ecu has put the engine management system into LHM - Limp Home Mode.... this is basic running mode 0 to protect everything, until such a time as you can get the car home - to a garage to get it hooked onto a diagnostic machine to see what the fault is thats occurred. This is a fault code read basically that reads the ecu - and will pick up the faults that are stored by way of codes - these are then interpreted to see where the fault lies...which component or area...
As you can imagine, without that test, it is as I say , very difficult to know where the fault would be...so that has to be your next move. Have the fault codes read at a local garage, many have the equipment to do this 0- and then you will know exactly where to look for the fault.At www.autozone.com its absolutely free to get car scanned and get codes.
Whats happens when you switch the ign off and restart - this has the effect of re setting the ecu - it runs ok - then the fault which is still there is detected each time by the ecu again and hence , it puts the light on again....so the faults code read is gong to have to be done to see whats wrong.
You could always have a good look around the engine to check to see if there is anything at all not right - poor connections , loose pipes etc etc --anything like that but there is not a lot you can do Diy wise like that -- but its certainly worth a look first.
Thanks. Keep updated for any more query. You can rate this solution and show your appreciation.

Posted on Aug 06, 2010

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