DTC P0089 Fuel Pressure Regulator Performance (4JJ3 with DPD)

1. DTC P0089 description

The ECM monitors the pressure in the fuel rail pressure based on the FRP sensor signals. If the pressure is high, the ECM adjusts the operation of the FRP reduction valve and decreases the fuel rail internal pressure. If clogging in the fuel return passage or a malfunction in the fuel supply pump occurs, decreasing pressure in the fuel rail will become impossible. If the ECM detects that the actual fuel pressure is higher than the desired fuel pressure, the DTC is set.

2. Condition for setting DTC P0089

Condition for running the DTC

The battery voltage is 9 to 16 V.
The ignition switch is ON.
The engine runtime is 5 seconds or more.
The drive duty of the fuel rail pressure regulator is 40% or more.
The commanded flow rate of the fuel rail pressure regulator is 90 mm3/sec or less.

DTCs P0192, P0193, P060B, and P0651 are not set.

Refer to "51.Engine Control 1A.Troubleshooting(4JJ3 with DPD) DTC P0192 Fuel Rail Pressure Sensor Circuit Low".

Refer to "51.Engine Control 1A.Troubleshooting(4JJ3 with DPD) DTC P0193 Fuel Rail Pressure Sensor Circuit High".

Refer to "51.Engine Control 1A.Troubleshooting(4JJ3 with DPD) DTC P060B Internal Control Module A/D Processing Performance".

Refer to "51.Engine Control 1A.Troubleshooting(4JJ3 with DPD) DTC P0651 Sensor Reference Voltage 2 Circuit".

Condition for setting the DTC

The ECM detects that the actual fuel rail pressure exceeds the desired fuel rail pressure by 40 MPa {5,800 psi} or more for 5 seconds or more.

3. Action taken when DTC P0089 sets

The ECM illuminates the MIL. Refer to Action taken when DTC sets - Type B.

Refer to "51.Engine Control 1A.Troubleshooting(4JJ3 with DPD) DTC type definitions".

The ECM inhibits the EGR control.

4. Condition for clearing DTC P0089

Refer to Conditions for clearing the MIL/DTC - Type A or Type B.

Refer to "51.Engine Control 1A.Troubleshooting(4JJ3 with DPD) DTC type definitions".