Table of Contents
How do I know if my main relay is bad?
Common signs include the engine not starting, inability to stay running for a long time, and the Check Engine Light coming on.
What causes a main relay to fail?
When operated at full load, a relay is said to have failed when its contacts fail to operate (often because they weld together) or when contact material erosion results in an unacceptable high path resistance. When asked to hot switch a load, a relay may only be good for 100,000 operations.
Will a bad main relay cause no spark?
If the fuel pump does not prime AND there is no spark, then it could be a bad main relay, a blown main relay fuse or ECU fuse, or a bad ground connection on the thermostat housing. If you only lack spark, check the timing belt and the coil and igniter unit in the distributor.
How do I know if my fuel pump or relay is bad?
How to tell if fuel pump relay is bad (6 Signs)
- Check Engine Light (CEL) Illuminated. In most cases, the primary symptom is a check engine light.
- High Mileage.
- Long Starting Time.
- Engine Performance Issues – Stalling, Idling, Acceleration, Not Starting.
- Car dies while driving.
- Silent Fuel Pump Noise.
What does the main engine relay control?
The main relay is a device that opens and shuts the fuel system, and in most cars it also opens and shuts the ignition system. A common main relay problem is that the car doesn’t start if the interior of the vehicle gets hot.
What does the main relay control on a Honda?
Main Relay Function Your vehicle’s main relay gives power to your car’s most electric components, like the engine control unit and other control modules. When you turn your vehicle on, it shifts the relay to a new position, which allows you to start your vehicle by sending power to the necessary components.
Why is my ignition coil not firing?
If the ignition coil does not have spark, it’s time to check its wires. Use a test light to check the continuity on the signal wire and power wire on the ignition coil. If both wires are functional but the coil fails to produce spark, the ignition coil or the ignition control module is bad.
Where is the ignition relay on a Honda?
The ignition relay is usually found in the fuse box situated underneath the hood or somewhere under the car’s dashboard. It transfers electricity from the battery to the ignition components, which allows you to start the car in the blink of an eye.