DTC P0190: Fuel Rail Pressure Sensor Circuit; DTC P0192: Fuel Rail Pressure Sensor Circuit Low Input; DTC P0193: Fuel Rail Pressure Sensor Circuit High Input: Wiring Diagram

Fig 1: Wiring Diagram - Fuel Rail Pressure Sensor Circuit

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

HINT:

If different DTCs related to different systems that have terminal E2 as the ground terminal are output simultaneously, terminal E2 may have an open circuit.
Read freeze frame data using the intelligent tester. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air/fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction (See FREEZE FRAME DATA ).

READ VALUE OF INTELLIGENT TESTER (FUEL PRESSURE)

Connect the intelligent tester to the DLC3.
Start the engine.
Turn the intelligent tester on.
Enter the following menus: DIAGNOSIS / ENHANCED OBD II / DATA LIST / PRIMARY / FUEL PRESS.
Read the values.

Pressure:

4 to 13 MPa (40.8 to 132.6 kgf/cm ² , 580 to 1, 885 psi).

Result

RESULT CHART

Fuel Pressure (MPa)

Proceed to

19.6 or more

0.0

OK (4 to 13 MPa (40.8 to 132.6 kgf/cm² , 580 to 1, 885 psi)) ⁽¹⁾

HINT:

⁽¹⁾	The value must be changed when the engine is running or stopped.

B : Go to step 3

C : CHECK FOR INTERMITTENT PROBLEMS

A : Go To Next Step

INSPECT FUEL PRESSURE SENSOR (VC VOLTAGE)

Disconnect the E37 fuel pressure sensor connector.
Turn the engine switch on (IG).
Measure the voltage according to the value(s) in the table below.

Standard voltage

TESTER CONNECTION SPECIFIED CONDITION CHART

Tester Connection	Specified Condition
VC (E37-3) - E2 (E37-1)	4.5 to 5.5 V

NG : Go to step 4

Fig 2: Inspecting Fuel Pressure Sensor (VC Voltage)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK : Go To Next Step

INSPECT ECM (PR VOLTAGE)

Start the engine.
Measure the voltage according to the value(s) in the table below.

Standard voltage

TESTER CONNECTION SPECIFIED CONDITION CHART

Tester Connection	Condition	Specified Condition
PR (E6-25) - E2 (E3-28)	25°C (77°F)	1.8 to 2.3 V

HINT:

The fuel pressure in the delivery pipe is 4 to 13 MPa (40.8 to 132.6 kgf/cm² , 580 to 1, 885 psi).

NG : Go to step 5

Fig 3: Inspecting ECM (PR Voltage)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK : REPLACE ECM

CHECK HARNESS AND CONNECTOR (ECM - FUEL PRESSURE SENSOR)

Disconnect the E3 and E6 ECM connectors.
Disconnect the E37 fuel pressure sensor connector.

Measure the resistance according to the value(s) in the table below.

Standard resistance (Check for open)

TESTER CONNECTION SPECIFIED CONDITION CHART

Tester Connection	Specified Condition
VC (E3-29) - VC (E37-3)	Below 1 Ω
PR (E6-25) - PR (E37-2)	Below 1 Ω
E2 (E3-28) - E2 (E37-1)	Below 1 Ω

Standard resistance (Check for short)

TESTER CONNECTION SPECIFIED CONDITION CHART

Tester Connection	Specified Condition
VC (E3-29) or VC (E37-3) - Body ground	10 kΩ or higher
PR (E6-25) or PR (E37-2) - Body ground	10 kΩ or higher

Reconnect the ECM connector.
Reconnect the fuel pressure sensor connector.

NG : REPAIR OR REPLACE HARNESS OR CONNECTOR

Fig 4: Identifying E3 And E6 ECM Connectors

OK : REPLACE ECM

CHECK HARNESS AND CONNECTOR (ECM - FUEL PRESSURE SENSOR)

Disconnect the E37 fuel pressure sensor connector.
Disconnect the E6 ECM connector.

Measure the resistance according to the value(s) in the table below.

Standard resistance (Check for short)

TESTER CONNECTION SPECIFIED CONDITION CHART

Tester Connection	Specified Condition
PR (E6-25) or PR (E37-2) - Body ground	10 kΩ or higher

Reconnect the ECM connector.
Reconnect the fuel pressure sensor connector.

NG : REPAIR OR REPLACE HARNESS OR CONNECTOR

Fig 5: Checking ECM - Fuel Pressure Sensor

OK : REPLACE FUEL PRESSURE SENSOR