Circuit Relay Related Issues . Toyota L Engine Guide

Circuit Relay Related Issues

Have you had experiences that your car stalled during your journey? It’s difficult to ascertain what could be the cause. This circuit relay issues can be new to you and you need to know about it so you will consider and include it in your diagnoses if ever your car frequently stalls.

You know your battery is in good condition.

You know you have enough fuel.

You know the fuel filter is doing its function effectively.

You might think the injection pump of your car needs to be calibrated.

But wait before you do the laborious and expensive repairs and fixtures, there is one thing you should first check and this is related to electrical issues.

I would like to prove to you what I am saying.  Here goes the story.

For thrice my car has been stalling in the midst and at the crossroads and it was a shameful situation. Isn’t it? I was causing the traffic.  

Because the engine can be cranked but cannot be started we have to push it and after doing so the engine finds its way to start over again.  

There was a time that along the way I have to call for a mechanic to see what was faulty. But as it was a joke the engine started and we got home but after several days it sometimes starts and sometimes it doesn’t.

At this point in time, I called my friend mechanic to once and for all diagnose the issue causing the inconveniences along the way.

We started the engine and as he inspects every angle he happened to bump on the electrical circuit and the engine stopped.

Circuit relay issues-circuit relayWhy Engine Stalls When Hot or During Long Trips-worn out contact points-circuit relay

Now we have discovered that the sockets are too loose and when the car is running and the current line is detached it stalls because no current to burn the fuel.

The following images below are the ones installed in my car.  Maybe your car is newer and you have a more advanced circuit relay.

I have to buy a new one and changed this old circuit relay.

Circuit relay issues-circuit relay

Circuit relay issues-circuit relay


What does this circuit relay do?

This circuit relay controls the electrical flow from the battery to the fuel control valve.  If electrical fails due to a defective circuit relay the fuel control valve doesn’t do anything and the fuel will not flow to the fuel injection pump.

Circuit Relay Issues- Fuel Control Valve
Fuel Control Valve

Although there are some fuel passages that supply the injection pump since there is no current nothing can ignite the fuel in the combustion chamber.

For sure your engine is being cranked but it will not start.


2 thoughts on “Circuit Relay Related Issues”

  1. Very informative article. I do not know much about cars but I sure am pissed whenever our car just suddenly stops working in the middle of the road and my husband can’t figure out exactly why. This happened twice already and it was really frustrating especially when we were literally racing against time to get to our destination.

    Before leaving the house, my husband always makes sure the car is in good working condition and when this problem happened, it didn’t occur to him that it could be a circuit relay related issue.

    By the way, is it advisable to regularly change the circuit relay of your car? If so, how often?

    • Thank you, Alice, for dropping by and having a comment.
      My answer to your question is, NO.
      My car is an old one and fittings and contact capabilities of the circuits have been caused by loose fittings and rust. Your car maybe newer and it may not be the cause. But tell your husband to start the engine and check all the lines supplying electricity to the engine including circuit relays. One is the negative terminal connected to the ground maybe loose or has poor contact due to corrosions. I mean from the battery terminal to the ground connected to the engine. I hope this can help.

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