What does the p0481 code on the Check Engine light mean?
If your vehicle’s check engine light comes on and after pulling the code you find a P0481 displayed, if refers to the engine cooling fan circuit. It is a generic code applying to all OBD II (on board diagnostics) vehicles. While you are driving, air in sufficient quantity is passing through the radiator effectively cooling the engine.
When to set the p0481 fan relay code?
When the PCM attempts to activate the fan and senses the command and the result do not match, the code is set. NOTE: P0481 speaks of the basic circuit, however codes P0480 and P0482 relate to the same problem with the only difference is they relate to the different fan speed relays.
Can a new starter cause an ECM to fail?
Installing a new starter can also cause ECM failure. This is because they often bypass the surge protector on the ECM, leading to a power surge when you start the vehicle. The same thing can happen if you get your wires crossed while jumping your car. A failing battery can also cause ECM failure.
Is there an ECM signal to the fuel pump relay?
The fuel pump relay works as it should. I always have power to Pin 30. I believe the ECM tells the relay to work via the green/black wire to Pin 85. This should happen for 2 seconds when the key is turned on. I have tested this when the issue is occurring and have confirmed that no signal is being sent from the ECM.
What to do if your ECM power relay is failing?
For this reason, if you suspect that your ECM power relay may be having an issue, have the vehicle inspected by a professional technician, such as one from YourMechanic, to determine if the relay should be replaced. The most popular service booked by readers of this article is Vehicle Engine Electrical Inspection.
What happens if the ECM fails on a car?
The fuel and ignition systems, as well as several other engine management functions, of many vehicles are controlled by the ECM. If the ECM or it’s relay fail, the entire engine management system will be left without power and will not function as a result.
What causes a battery to go dead on an ECM?
Battery drain or dead battery A failed ECM power relay can also cause a battery drain or dead battery. If the relay shorts it can leave power on to the computer, even when the vehicle is turned off. This will place a parasitic drain on the battery, which will eventually cause it to go dead.
Where are the fuses and relays on a car?
You can start by checking the easy stuff, the fuses and relay, for your wipers. The fuse and relay should be in the fuse block in your engine bay. If the fuse is good and the relay is working correctly then you’ll need to get out a voltmeter and find out where you’re the interuption is in the circuit.
What’s the difference between p0481 and p0472?
NOTE: P0481 speaks of the basic circuit, however codes P0480 and P0482 relate to the same problem with the only difference is they relate to the different fan speed relays. Check engine light (malfunction indicator lamp) illumination and code P0481 set
What was the name of the Saturn L in 2001?
2001: For the 2001 model year, all of the L-series sedan and station wagon models were renamed for 2001. For the sedans, the LS was renamed as the L100, the LS1 was renamed as the L200, and the LS2 was renamed as the L300. For the station wagons, the LW1 was renamed as the LW200, and the LW2 was renamed as the LW300.