A new light on your dashboard? You don’t understand why it doesn’t turn off… It’s normal, a car is complex and there are various motives why a light might occur. If your glow plug light comes on while driving your Toyota Hilux 4, it may possibly point out several problems. In this post, we will do everything we can to support you see things more clearly. First, we will find out how the preheating light on your Toyota Hilux 4 functions, and then the different motives it lights up when you are driving


What is the role of my Toyota Hilux 4 glow plug light?

The primary goal of the engine glow plug light, which is generally symbolized by a yellow coil, is to ensure that your glow plugs are working effectively. In fact, it must light up when you switch on your Toyota Hilux 4 to tell you that they are heating the intake air in your cylinders and must go out after a few minutes when the engine is running. This preheat light is therefore not meant to stay or come on while driving with your motor vehicle. However, if it comes on while driving, it may reveal several failures, we will try to point out the most important ones.

What to do if the glow plug light comes on while driving on my Toyota Hilux 4?

A glow light that comes on while driving on your Toyota Hilux 4 or at any other time other than when the engine is started is intended to inform you to a problem other than your spark plugs, we will check out this now. Whatever the case, connecting your vehicle to the diagnostic tool will allow you to properly understand the motive for the light up of your glow light.

My Toyota Hilux 4 glow light comes on and I’m suffering from a loss of power

The first probability is that you detect that your glow plug light comes on while driving your Toyota Hilux 4 and that you also knowledge a loss of power. In such a case, several complications can describe its presence. Here is a list of the most important motives:

  • Problem of EGR valve, in fact, if you are affected a loss of power, it is possible that your EGR valve is clogged, in this case, it is expected that your preheat light comes on while driving on Toyota Hilux 4 because it is one of the failures of which it is intended to warn you. Have the status of your valve checked out
  • Problem associated with the turbo overflow valve, in this situation the ECU can no longer manage the turbo intake pressure, which can lead to turbo boost and a perturbation in the operation of the turbo.
  • Problem relevant to the injection, either an injector that has seized up or the injection pump that is broken by filings or other possible foreign bodies that disturb its proper operation.
  • Finally, the last problem that could lead to a glow indicator light on your Toyota Hilux 4 coupled with a loss of power, is that your fuel filter is too dirty, you should come to feel jerks because of a bad fuel flow in the engine.

My glow plug light comes on or is flashing but no difference on the performance of my Toyota Hilux 4

Finally, we’ll give you the motives for a glow plug light that comes on on your Toyota Hilux 4 without you feeling any difference in power or motor vehicle behaviour. In general, this is an electronic problem:

  • Glow plug relays or fuses to be swapped out, test and replace if necessary.
  • A contactor/potentiometer on one of your pedals (brake, accelerator or clutch) has failed, often a simple de-seizure will be enough to resolve the problem.
  • You have a false contact somewhere in your electrical circuit, check the other alternatives first because it is not easy to find it alone, we advise you to go to your auto technician.
  • Faulty injection pressure sensor, ECU error
  • If perhaps you have any further questions about the Toyota Hilux 4, do not hesitate to consult our Toyota Hilux 4 category.