Is there a bad wire to the ECM?
Suspected bad wire to ECM or ECM. The ECM in some manner controls the voltage regulator, which charges the battery. The voltage regulator works all on its own. The computer does not control it in any way. Yes the charging system goes through the pcm ,The Electronic Voltage…
What are the symptoms of a bad ECM power relay?
A bad relay may cause the vehicle to crank, but not start, or sometimes not even crank at all. 3. 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.
What should the voltage be on my ECM PCM sensor?
If the meter reads 5.0 volts, the electrical circuit is good. If the meter reads other than 5 volts, ground one meter lead and test the 5 volt reference wire. It should read 5 volts. If it doesn’t you have a wiring or computer problem. Using the wiring diagram check the pin at the computer that supplies the 5 volts.
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.
What should I do if my ECM blower motor does not run?
If the motor runs the problem is in the low voltage thermostat wire. If the motor does not run, remove the 16 pin plug from the IFC board. Locate pins 12 and 15. Connect 24 volts from R to pin 12 and pin 15. Connect pins 1 and 3 to the common side of the 24 volt transformer (fig. 4). The motor should run. ECM Blower Motor Quick Test
What would cause your ECM to go bad?
Bad grounding and loose wires in the ECMs harness can also result in blow-ups and short circuits. Other causes include welding damages, physical knocks and accidents that may leave the ECM and battery grounding loose. The car can run with a faulty or bad ECM with periodic erratic performance.
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 should the voltage be for 117 volts?
With 120V being the U.S. standard voltage, then minus 5% results in 114 volts minimum. If you are reading 117 V on your voltmeter, that is right there in the middle of the voltage regulation range – all is good. The power company strives to keep the voltage within plus or minus 5% – within that range all loads operate normally.