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P0090 - FUEL PRESSURE REGULATOR 1 CONTROL CIRCUIT OPEN
When DTC code P0090 OBDII is stored it is because the PCM (Powertrain Control Module)
has observed an open circuit in the electronic fuel pressure regulator,
this regulator is designated as 1 in systems using multiple fuel pressure regulators.
It should be noted that this designation does not refer exclusively to the engine bench.
The pressure regulator is controlled by the PCM.
It has a battery voltage signal cable and a ground signal cable, which operate a servomotor that places a valve,
which can reach a desired fuel pressure level in any circumstance.
When voltage is applied to the regulator engine, the valve proceeds to open in small increments and thus the fuel pressure increases.
At the moment the voltage is reduced, the servomotor retracts and a spring forces the valve to close, there the fuel pressure is reduced.
The Fuel Rail Pressure Sensor (FRP) allows the PCM to monitor fuel pressure and can adjust the fuel pressure regulator voltage as needed.
Although both components can be integrated in a single housing, they are separate.
Symptoms of DTC code P0090 Generic
- Check Engine light illumination.
- A delayed start.
- Black smoke expelled by the exhaust.
- Fuel consumption increases.
Causes of DTC code P0090 Generic
Diagnostic code P0090 OBD2 is established due to the following:
- The cables or connectors of the fuel pressure regulator may have defects, thus shorting the circuit.
- The fuel pressure regulator may be in poor condition.
- It is possible that the FRP Sensor is defective.
Possible solutions of DTC code P0090 Generic
The steps to troubleshoot the P0090 OBDII error code are as follows:
- Check the entire wiring system, as well as the connectors that relate to the fuel pressure regulator.
Note that these components are exposed to high temperatures because they are close to the engine.
If you find problems with them, you should repair them.
Then erase the code.
- If the code returns, check the voltage and ground of the regulator.
If no voltage is present, test the relays and fuses of the power supply taking into account the wiring diagram.
Also, you must use the diagram to know the location of the ground.
You must make sure that all of these circuits meet the manufacturer's specifications.
- If the voltage and ground values are OK, test the system pressure using a fuel gauge.
Observe the fuel system data while in the scanner you see the manual fuel pressure.
If the fuel pressure reflected on the scanner's data screen does not match the actual fuel pressure,
the Fuel Rail Pressure Sensor is defective, replace it.
- To check that the fuel regulator is in good condition, you should check to see if actual fuel pressure changes occur with variations in fuel pressure voltage.
If you don't do it that way, the problem is in the regulator circuit or in the regulator itself.
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