DTC P0088 Fuel Rail/System Pressure - Too High (4JJ3 without DPD)

1. DTC P0088 description

The FRP sensor is installed to the fuel rail and detects the fuel pressure in the fuel rail. As the fuel pressure in the fuel rail changes, the output voltage of the FRP sensor changes. If the fuel pressure in the fuel rail is low, the output voltage becomes low, and if the pressure is high, the output voltage becomes high. The ECM reads this change in output voltage, converts it to fuel pressure in the fuel rail, and uses it for control. The sensor 5 V power supply, signal, and ground circuits of the FRP sensor are dedicated circuits and are connected to the ECM. Also, the sensor circuit is shielded to prevent intrusion of electronic noise, etc. If the ECM detects that the fuel pressure is excessively high for a predetermined period of time, the DTC is set.

2. Condition for setting DTC P0088

Condition for running the DTC

  • The battery voltage is 9 to 16 V.
  • The ignition switch is ON.
  • The engine is running.
  • DTCs P0192, P0193, P060B, and P0651 are not set.

Refer to "51.Engine Control 1A.Troubleshooting(4JJ3 without DPD) DTC P0192 Fuel Rail Pressure Sensor Circuit Low".

Refer to "51.Engine Control 1A.Troubleshooting(4JJ3 without DPD) DTC P0193 Fuel Rail Pressure Sensor Circuit High".

Refer to "51.Engine Control 1A.Troubleshooting(4JJ3 without DPD) DTC P060B Internal Control Module A/D Processing Performance".

Refer to "51.Engine Control 1A.Troubleshooting(4JJ3 without DPD) DTC P0651 Sensor Reference Voltage 2 Circuit".

Condition for setting the DTC

  • The ECM detects that the fuel rail pressure is 270 MPa {39,150 psi} or more for 2 seconds or more.

3. Action taken when DTC P0088 sets

  • Euro4: The ECM illuminates the MIL. Refer to Action taken when DTC sets - Type A (Euro4).
  • Except Euro4: The ECM illuminates the check engine warning light. Refer to Action taken when DTC sets - Type A (Except Euro4).

Refer to "51.Engine Control 1A.Troubleshooting(4JJ3 without DPD) DTC type definitions".

  • The ECM limits the fuel injection quantity.
  • The ECM inhibits the EGR control.
  • The ECM limits the fuel rail pressure.
  • The ECM inhibits the cruise control.

4. Condition for clearing DTC P0088

  • Euro4: Refer to Condition for clearing the MIL/DTC - Type A or Type B (Euro4).
  • Except Euro4: Refer to Condition for clearing the check engine warning light/DTC - Type A or Type B (Except Euro4).

Refer to "51.Engine Control 1A.Troubleshooting(4JJ3 without DPD) DTC type definitions".

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