P2293 Fuel Pressure Regulator 2 Performance
Content
OBD-II Trouble Code - P2293 - Data Sheet
P2293 - Fuel pressure regulator performance 2
This Diagnostic Trouble Code (DTC) is a generic OBD-II transmission code. It is considered universal as it applies to all makes and models of cars (1996 and newer), although specific repair steps may differ depending on the model.
What does trouble code P2293 mean?
The fuel pressure regulator is responsible for maintaining a constant fuel pressure. On some vehicles, the fuel pressure is built into the fuel rail. On other non-return vehicles, the regulator is part of the fuel pump module inside the tank.
Non-return fuel systems are computer controlled, and the power of the fuel pump and the actual pressure in the fuel rail are sensed by a rail pressure sensor that uses the fuel temperature to determine the actual pressure. The powertrain control module or engine control module (PCM / ECM) has determined that the target fuel pressure is out of specification for the fuel pressure regulator labeled 2 and will set DTC P2293.
Note. On Vehicles Equipped With Returnless Fuel Systems With Supply Line Only - If fuel is not returned to the tank, it may be necessary to check the fuel pressure setpoint and actual values with an advanced scan tool capable of monitoring these values. If there are any other codes such as lean oxygen sensors present along with P2, code P2293 must be resolved first before moving on to other codes.
Related Fuel Pressure Regulator Engine Codes:
- P2294 Fuel Pressure Regulator 2 Control Circuit
- P2995 Low indicator of the fuel pressure regulator control circuit 2
- P2296 A high rate of the fuel pressure regulator control circuit 2
Symptoms of a P2293 trouble code may include:
Symptoms of a P2293 trouble code may include:
- Poor fuel economy
- Poor acceleration or hesitation
- Other codes may be present such as lean O2 sensors.
- Check Engine Light (Malfunction Indicator Lamp) is on
- Depending on the low fuel pressure and the cause of the malfunction, the engine may run at low power or without speed limitation.
- The engine may run well, but it lacks top speed.
Causes
Possible causes of DTC P2293 may include:
- Fuel pump power
- Clogged or pinched fuel lines / clogged fuel filter
- Defective regulator
- Defective fuel pressure sensor or wiring
- The engine control module (ECM) monitors and monitors the fuel pressure at the fuel injector and if the requested fuel pressure is lower or higher than the specified one, a code will be set.
- The fuel pressure regulator is internally out of specification.
- Clogged fuel filter or faulty fuel pump.
Possible Solutions to Code P2293
Fuel pressure – Fuel pressure can be checked with a mechanical pressure gauge attached to the fuel rail. If the fuel pressure is within factory specifications, the fuel pressure sensor may be giving a false reading to the PCM/ECM. If the fuel pressure test port is not available, the fuel pressure can only be checked with an advanced scan tool or by splicing the adapter fittings between the fuel lines and the fuel rail.
Fuel pump – Fuel pump output is determined by the PCM/ECM and can be controlled by an external fuel management computer. The fuel pump can be cycle controlled on vehicles with returnless fuel systems. An advanced scan tool may be required to verify the output of these types of fuel systems. Test the fuel pump for sufficient power by locating the fuel pump wiring harness. Some vehicles may not be able to easily check fuel pump wiring connections. Check battery voltage at the fuel pump positive terminal with a digital volt/ohmmeter set to volts, with the positive lead on the power wire and the negative lead on a known good ground, with the key in the on or run position. The fuel pump power wire can only be energized when the engine is started or the vehicle is running. The displayed voltage should be close to the actual battery voltage.
If there is not enough power, suspect the wiring to the fuel pump and trace it to determine if there is excessive resistance in the wiring, loose wires, or loose/dirty connections. On return type fuel pumps, ground can be checked with the DVOM set to the ohm scale with either wire on the ground wire and the other wire on a well known ground. The resistance must be very low. On non-return fuel systems, the start wire can be checked with a graphical multimeter or an oscilloscope set to the duty cycle scale. Normally the duty cycle from the fuel pump computer will be twice as long as the computer set duty cycle from the PCM/ECM. Using a graphical multimeter or oscilloscope, connect the positive lead to the signal wire and the negative lead to a known good ground. You may need to identify the correct wire using the factory wiring diagram. The actual duty cycle should be approximately twice what the PCM/ECM commands, if the displayed duty cycle is half the amount, the DVOM settings may need to be changed to match the type of duty cycle being tested.
Fuel lines – Look for physical damage or kinks in the fuel lines that could obstruct the fuel pump supply or return lines. It may be necessary to remove the fuel filter to determine if the fuel filter is clogged and needs to be replaced. It must flow freely in the direction of flow indicated by the arrow on the fuel filter. Some vehicles are not equipped with fuel filters, and the filter is located at the inlet of the fuel pump itself, it will be necessary to remove the fuel pump module to determine if there is a lot of debris in the tank or if the fuel filter has been crushed or pinched, which can also restrict fuel supply to the pump.
Regulator – On vehicles equipped with a reverse fuel system, the regulator is usually located on the fuel rail itself. The fuel pressure regulator usually has a vacuum line that mechanically limits the fuel supply depending on the amount of vacuum created by the engine. Check for damaged or loose vacuum hoses to the regulator. If there is fuel in the vacuum hose, there may be an internal leak in the regulator causing a loss of pressure. Using a non-damaging clamp, the hose can be pinched behind the fuel pressure regulator - if the fuel pressure is higher with a restriction on the back of the regulator, the regulator may be faulty. On non-return systems, the fuel pressure regulator may be located inside the gas tank on the fuel pump module and the fuel pump module assembly may need to be replaced.
Fuel pressure sensor – Test the fuel pressure sensor by unplugging the connector and checking the resistance across the terminals with the DVOM set to the ohm scale with positive and negative wire at either connector. The resistance should be within factory specifications. Check the fuel pressure sensor reference voltage with the factory wiring diagram to determine which wire is supplying power to the sensor using the DVOM set to volts with the positive wire on the power wire and the negative wire on a known good ground. The voltage should be around 5 volts, depending on the car.
If the voltage is out of specification, monitor the wiring to determine if there is excessive resistance in the wire that supplies power to the sensor. The signal wire can be tested with a DVOM set to the volt scale with the positive wire inserted in the signal wire and the negative wire at a well known ground with the vehicle turned on and running. The displayed voltage should be within the factory specifications depending on the outside temperature and the internal temperature of the fuel inside the lines. The PCM / ECM converts the voltage to temperature to determine the actual fuel pressure. It may be necessary to check the voltage at the PCM / ECM harness connector to determine if there is a voltage difference. If the voltage at the PCM / ECM does not match the voltage displayed at the fuel pressure sensor, there may be excessive resistance in the wiring.
Disconnect the PCM / ECM harness connector and fuel pressure sensor connector to test for excessive resistance using a DVOM set to ohms with either wire at each end of the harness. The resistance should be very low, any excessive resistance could be a wiring fault, or there could be a short to power or ground. Find a short to power by removing the PCM / ECM harness connection to the DVOM set to the volt scale with the positive wire at the fuel pressure signal terminal and the negative wire at a known good ground. If the voltage is the same or higher than the reference voltage, there may have been a short to power and it will be necessary to trace the wiring to determine if there is a short. Check for short to ground by setting the DVOM to ohms scale with either wire on the signal wire at the PCM / ECM harness connector and the other wire to a well known ground. If resistance is present, a ground fault may have occurred and it will be necessary to trace the wiring to determine the location of the ground fault.
COMMON ERRORS WHEN DIAGNOSING CODE P2293?
- Clearing ECM memory codes before checking freeze frame data for the underlying fault so that the fault can be duplicated and repaired.
- Replacing the high pressure fuel pump when the filter is clogged.
HOW SERIOUS CODE P2293 IS?
Code P2293 is a code that indicates that the fuel pressure is different from that set by the ECM for the fuel injectors. The problem can cause various problems due to too low or too high fuel pressure when the sensor fails or fails.
WHAT REPAIRS CAN FIX CODE P2293?
- Replace the fuel filter if it is clogged.
- Replace the fuel pump if it does not build enough pressure or if it fails intermittently.
- Replace the fuel pressure regulator sensor 2 if it cannot be checked.
ADDITIONAL COMMENTS REGARDING CODE P2293 CONSIDERATION
Code P2293 is most commonly caused by a clogged fuel filter or intermittent fuel pump failure. If the engine has been replaced on some vehicles, check that the part numbers of the new fuel pressure regulator match or that the code is set.
Need more help with your p2293 code?
If you still need help with DTC P2293, post a question in the comments below this article.
NOTE. This information is provided for informational purposes only. It is not intended to be used as a repair recommendation and we are not responsible for any action you take on any vehicle. All information on this site is protected by copyright.
