How much voltage should a fuel pump have?
System voltage should read 11.8 – 12.6v DC or higher with no electrical loads on the system. If voltage reads less, starting and charging system should be investigated before performing fuel system electrical testing. 1. Connect digital voltmeter to fuel pump wiring at fuel pump connector.
Can I wire my fuel pump straight to battery?
Registered. Yes, they both go to the positive side of the battery.
Can a bad fuel pump cause low voltage?
Resistance can be caused by corrosion, fretting and even air. If you were to put a 1.0-ohm resistor in a fuel pump circuit, it would lower the 13.25 volts prior to 9.78 volts. It could be caused by a corroded ground, a connector that is no longer sealed or even a connection that is weak due to poor retention.
What causes high voltage to fuel pump?
An excessive voltage drop in the fuel pump power circuit can be caused by these problems: A corroded or damaged electrical connector or junction in the power circuit causing excessive resistance. A failing fuel pump relay with burned or corroded contacts. Damaged wiring due to failing wiring insulation.
What causes low voltage at fuel pump?
The voltage drop occurs because of resistance in the circuit that supplies the pump. The resistance could be in the connectors, grounds or harness. A resistor or insulator prevents the flow of electricity in a circuit. Resistance can be caused by corrosion, fretting and even air.
Are there no volts from the fuel pump connector?
No volts from fuel pump connector. I have checked the EFI mini fuses and they are ok, I switched the EFI relay with the fog lamp relay, and both relays seem to be good. I also swapped the C/OPN relay with the P/W relay, and both relays seem to be good.
What should the voltage be at the fuel pump relay?
You should have 12 volts at the dark green/yellow wire at the fuel pump relay. The inertial fuel shutoff switch is between the relay and the fuel pump. The pink/black wire from the inertial switch to the fuel pump should have 12 volts. You can measure the voltage, on the pink/black wire, at the fuel pump.
What’s the battery voltage on a Toyota Matrix?
Pin 5 is 11.77. Battery is a little low since messing with car. If you place a jumper wire from pin five to pin three this would be the same as the relay being closed and would send 12 V to the fuel pump does this send 12 V to the pump and make it run? I ran jumper from pin 3 to pin 5.
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.