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What is the secondary circuit on a fuel pump?

What is the secondary circuit on a fuel pump?

Definition. The FPDM or Fuel Pump Driver Modules control the voltage to the Fuel Pump to help keep proper fuel pressure throughout the operating range of the engine. Error Code P1237 takes place when the FPDM has determined a problem in the fuel pump secondary circuit.

What does fuel pump secondary circuit open mean?

Decreased engine performance
OBD-II Code Decreased engine performance is defined as a Fuel Pump Secondary Circuit/Open. The Fuel Pump enables the transfer of fuel from the fuel tank to the fuel injectors in the engine. The Fuel Pump is controlled by the engine computer (PCM) or the Fuel Pump Control Module (most newer vehicles).

What does fuel pump secondary circuit high mean?

P0232
The P0232 fault code can be described as fuel pump secondary circuit high. The P0232 is a generic OBD-II code which can start appearing when the engine control module would detect that the secondary circuit to the fuel pump has a high voltage when the fuel pump relay is turned off.

Where is the fuel pump fuse on a 1994 Ford Ranger?

Locate the fuse and relay box in the engine compartment. It is located near the firewall on the driver’s side of the engine compartment.

What is a fuel pump secondary circuit fault?

Code P0232 is triggered when voltage in the fuel pump secondary circuit is shorted to vehicle power through the relay. The ECM monitors this voltage to see if it stays on after the key is turned off. The most common failure is a relay stuck to the On position internally.

Where is fuel pump relay?

fuse box
The fuel pump relay is an electronic component that is found on virtually all vehicles equipped with an internal combustion engine. It is often found in the fuse box located in the engine bay and functions as the primary electronic switch that controls power to the fuel pump.

How do you test fuel pump relay?

How to test a fuel pump relay

  1. Park the car in safe and level ground.
  2. Step 2: Turn the ignition key in the ON position but don’t start the car.
  3. Step 3: Raise the hood and locate the fuel pump relay.
  4. Step 4: The fuel pump relay will emit a clicking or buzzing sound when turning the key in the ON position.

How do you test a fuel pump on a Ford Ranger?

Hearing the Fuel Pump Have a partner sit in the driver’s seat. Take the gas cap off and have your partner turn the ignition key to “start.” Ensure the gas door is open; when the key is turned, you will hear the fuel pump. If you do not hear the pump, then you will know the pump is gone bad.

Where is the inertia switch on a 94 Ford Ranger?

Sounds like you need to re-set your fuel pump inertia switch. It’s located under the dash in the passenger foot area, just at the front edge of the carpet. At the top of the switch is a white button, push it down to re-set it. It should fire right up.

What does the p1237 code on a Ford fuel pump mean?

P1237 FORD Description. The P1237 code indicates the FPDM detected a fuel pump secondary circuit concern. The FPDM sends a message to the Powertrain Control Module ( PCM) through the Fuel Pump Monitor (FPM) circuit indicating this concern was detected. The PCM sets the DTC when the message is received.

What is the diagnostic code for fuel pump secondary circuit high?

P0232 is a diagnostic trouble code (DTC) for “Fuel Pump Secondary Circuit High”. This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation.

What does the code p0232 on a fuel pump mean?

Code P0232 is triggered when voltage in the fuel pump secondary circuit is shorted to vehicle power through the relay. The ECM monitors this voltage to see if it stays on after the key is turned off. The most common failure is a relay stuck to the On position internally.

What’s the code on my fuel pump light?

About 2 or 3 months ago, i had my fuel pump replaced, after a week or so, my “service engine soon” light came on. i had two codes causing that, first code was the, “PO455” and “PO231”, I took care of the first code, but can not figure out whats wrong with the