Circuit description

The fuel pressure sensor, built into the delivery pipe, converts the fuel pressure into an electric signal and outputs it to the engine control computer. When the output from the fuel pressure sensor is cut off, the engine control computer stops the fuel pump assembly (high-pressure side), and supplies fuel from the fuel pump (low-pressure side).

DTC DETECTION CONDITION

DTC No.	DTC detection condition	Suspected parts
P0191	When any of the following conditions is met (2 trip detection logic): After 9.5 hours or more have passed since the last turning of IG SW OFF, when the fuel pressure is 19.2 MPa {144000 mmHg, 5670 inHg, 2780 psi} or more with IG SW ON. After 5 hours or more have passed since the last turning of IG SW OFF, when the fuel pressure after the engine started is 1.84 MPa {13800 mmHg, 543 inHg, 267 psi} or less for 10 seconds or more.	Open or short circuit in the fuel pressure sensor Fuel pressure sensor ECM
P0192	The voltage in the fuel pressure sensor was too low for 2.5 seconds or more. (1 trips detection logic)	Short circuit in the fuel pressure sensor Fuel pressure sensor ECM
P0193	The voltage in the fuel pressure sensor was too high for 2.5 seconds or more. (1 trips detection logic)	Open or short condition in the fuel pressure sensor circuit Fuel pressure sensor ECM

NOTE: After checking the DTC output, using the SSM3, read the fuel pressure on the [Current Data Display & Save] screen.

FUEL PRESSURE SPECIFICATIONS

Fuel pressure	Content of malfunction
Approx. 0 kPa {0 mmHg, 0 inHg, 0 psi}	Open circuit in the RP circuit Open circuit in the VC circuit Open circuit in the E1 circuit Short circuit between the PR circuit and the ground circuit Short circuit between the PR circuit and the E1 circuit
Approx. 25000 kPa {188000 mmHg, 7400 inHg, 3600 psi} or more	Short circuit between the PR circuit and the VC circuit Short circuit between the PR circuit and the power supply circuit