DTC P0087 (Flash Code 225) Fuel Rail/System Pressure - Too Low (RZ4E-TC)

1. DTC P0087 description

A typical common rail (fuel rail) system is composed of the following 2 fuel pressure sections. A suction side between the fuel tank and the fuel supply pump and a high-pressure side between the fuel supply pump and the injectors. The fuel is drawn from the fuel tank and then pumped into the fuel rail by 2 plungers that are located inside the fuel supply pump. The fuel rail pressure is regulated through the ECM's control of the FRP regulator based on signals from the FRP sensor. If the fuel rail pressure becomes excessive, the fuel rail pressure limiter opens to release the excessive pressure and returns the fuel into the fuel tank. If the ECM detects that the pressure limiter has operated and pressure has sharply decreased after the fuel rail pressure had increased to an excessively high level, the DTC is set.

2. Condition for setting DTC P0087

Condition for running the DTC

  • The battery voltage is 9 to 16 V.
  • The ignition 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(RZ4E-TC) DTC P0192 (Flash Code 245) Fuel Rail Pressure Sensor Circuit Low".

Refer to "51.Engine Control 1A.Troubleshooting(RZ4E-TC) DTC P0193 (Flash Code 245) Fuel Rail Pressure Sensor Circuit High".

Refer to "51.Engine Control 1A.Troubleshooting(RZ4E-TC) DTC P060B (Flash Code 36) Internal Control Module A/D Processing Performance".

Refer to "51.Engine Control 1A.Troubleshooting(RZ4E-TC) DTC P0651 (Flash Code 56) Sensor Reference Voltage 2 Circuit".

Condition for setting the DTC

  • The ECM detects that the fuel rail pressure is the predetermined value or more and the pressure limiter is activated.

3. Action taken when DTC P0087 sets

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

Refer to "51.Engine Control 1A.Troubleshooting(RZ4E-TC) DTC type definitions".

  • The ECM inhibits pre-injection.

4. Condition for clearing DTC P0087

  • 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(RZ4E-TC) DTC type definitions".

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