1. DTC P0093 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 ECM detects that the fuel rail pressure is low as compared with the engine speed, the DTC is set.
2. Condition for setting DTC P0093
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 intake air temperature is -40°C {-40°F} or more.
- The fuel temperature is -0.1°C {32°F} or more.
- The engine is running.
- Rail pressure feedback mode is active.
- DTCs P0087, P0091, P0092, P0112, P0113, P0192, P0193, P0201, P0202, P0203, P0204, P060B, and P0651 are not set.
Refer to "51.Engine Control 1A.Troubleshooting(RZ4E-TC) DTC P0087 (Flash Code 225) Fuel Rail/System Pressure - Too Low".
Refer to "51.Engine Control 1A.Troubleshooting(RZ4E-TC) DTC P0091 (Flash Code 247) Fuel Pressure Regulator Control Circuit Low".
Refer to "51.Engine Control 1A.Troubleshooting(RZ4E-TC) DTC P0092 (Flash Code 247) Fuel Pressure Regulator Control Circuit High".
Refer to "51.Engine Control 1A.Troubleshooting(RZ4E-TC) DTC P0112 (Flash Code 22) Intake Air Temperature Sensor Circuit Low".
Refer to "51.Engine Control 1A.Troubleshooting(RZ4E-TC) DTC P0113 (Flash Code 22) Intake Air Temperature Sensor Circuit High".
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 P0201 (Flash Code 271) Injector Circuit - Cylinder 1".
Refer to "51.Engine Control 1A.Troubleshooting(RZ4E-TC) DTC P0202 (Flash Code 272) Injector Circuit - Cylinder 2".
Refer to "51.Engine Control 1A.Troubleshooting(RZ4E-TC) DTC P0203 (Flash Code 273) Injector Circuit - Cylinder 3".
Refer to "51.Engine Control 1A.Troubleshooting(RZ4E-TC) DTC P0204 (Flash Code 274) Injector Circuit - Cylinder 4".
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 actual fuel rail pressure is the predetermined value or less for 10 seconds or more.
3. Action taken when DTC P0093 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 P0093
- 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".