2008 Mazda B Series 4wd-cab-plus OBD2 Code P0192 Fuel Rail Pressure Sensor Circuit Low Input

P0192 trouble code definition

Fuel rail pressure sensor circuit low input

What the P0192 code means

The power control module (PCM) has detected that the fuel pressure is not within the normal range which is required for proper engine operation.

What causes the P0192 code?

• Fuel pump failure
• Faulty fuel pressure sensor
• No or low fuel
• Wires that are broken, shorted, or corroded
• Connectors that are broken, shorted, or corroded
• Clogged fuel filter
• Faulty fuel pump relay

What are the symptoms of the P0192 code?

• Car won't start
• Car cranks longer than normal during start up
• Hesitation during acceleration

How does a mechanic diagnose the P0192 code?

• The mechanic will inspect the fuel rail pressure sensor wiring and connectors. They will check for wires that are burned or shorted and connectors that are corroded. If necessary, replace the connectors and circuitry.

• Collects freeze frame data and the trouble codes stored by the power control module (PCM), using an OBD-II scanner

• Clears the trouble codes and perform a test drive to see if any codes come back

• There could be an intermittent problem if the trouble code P0190 does not return immediately. It may not be possible to diagnose an intermittent problem right away.

• If the test drive cannot be performed, it is because your 2008 Mazda B Series 4wd-cab-plus won't start. They will then test the fuel pressure with a fuel pressure gauge.

• A low fuel pressure reading could be an indication that your 2008 Mazda B Series 4wd-cab-plus is out of gas. It is important to make sure there is gas in your 2008 Mazda B Series 4wd-cab-plus during this step in the diagnosis process.

• After confirming that there is gas in the car, make sure the fuel pump is operating by listening to it.

• If the fuel pump is operating, but your 2008 Mazda B Series 4wd-cab-plus will not start, this could be an indication that a fuel filter is clogged, there's an issue with the fuel injector circuits, or that the power control module (PCM) is faulty.

• If they cannot hear the fuel pump, they will tap on the fuel tank while simultaneously attempting to start your 2008 Mazda B Series 4wd-cab-plus. This step will require two people.

• If your 2008 Mazda B Series 4wd-cab-plus starts, this is an indication that the fuel pump is faulty.

• If your 2008 Mazda B Series 4wd-cab-plus does not start, the battery voltage will need to be checked at the fuel pump connector.

• If there is no battery voltage reading at the fuel pump connector, the fuse circuit, fuel pump relay circuit, and power control module (PCM) circuit should be inspected. If the fuse, fuel pump relay, and power control module (PCM) circuits are not working properly, inspect the fuel rail pressure sensor.

• Test the fuel rail pressure sensor for a reference voltage at the connector with a digital volt ohmmeter. A good reference voltage reading is 5-volts and this should be tested when your 2008 Mazda B Series 4wd-cab-plus is running.

• If the fuel rail pressure sensor has a 5-volt reading, the next step would be to test the sensor ground wire.

• If the results show a reference signal and ground signal, the sensor's resistance will need to be tested. Use the manufacturer's pressure-to-resistance chart to make a determination as to whether the fuel rail pressure sensor needs to be replaced.

• Retest the fuel system to make sure it is working properly. If the circuitry and sensors are operational, it is possible that there is a problem with the power control module (PCM). This is not common, but would require replacing and reprogramming the power control module (PCM).

Common mistakes when diagnosing the P0192 code

A common mistake when diagnosing the P0192 trouble code is replacing the fuel rail pressure sensor without inspecting the other components of the system.

Before replacing the fuel rail pressure sensor or any other component of the system, check the fuel level to see if your 2008 Mazda B Series 4wd-cab-plus has no fuel.

How serious is the P0192 code?

• This code is considered serious because of the drivability issues the driver may experience while operating your 2008 Mazda B Series 4wd-cab-plus.

• The car may not start or will struggle to start, and may have poor pick up during acceleration. For these reasons, the P0192 trouble code should be addressed as soon as possible.

What repairs can fix the P0192 code?

• Adding fuel to a low or empty fuel tank
• Repairing wiring and/or connectors that are corroded
• Repairing wiring that is shorted, broken, or frayed
• Replacing clogged fuel filter
• Replacing fuel pump relay
• Replacing fuel pump fuse
• Replacement of the fuel pump
• Replacement of the fuel rail pressure sensor

Additional comments for consideration regarding the P0192 code

It is common for a low fuel level to cause this trouble code. It is important to check the fuel level, inspect all components of the fuel system, and complete all of the necessary diagnostic steps before replacing the fuel rail pressure sensor.

Need help with a P0192 code?

Check Engine Light

P0192

trouble codes