ECD SYSTEM, Diagnostic DTC:P0191, P0192, P0193, P1164, P1165

DTC Code	DTC Name
P0191	Common Rail Pressure Sensor Gradient of Common Rail Pressure Too High
P0192	Short to GND in Common Rail Pressure Sensor Circuit
P0193	Open or Short to B+ in Common Rail Pressure Sensor Circuit
P1164	Common Rail Pressure Sensor Offset, PCV Controller in Open Loop
P1165	Common Rail Pressure Sensor Inconsistency between Rail Pressure and PCV Current

DESCRIPTION

The fuel pressure sensor detects the fuel pressure in the common rail, and outputs the signal to the ECM. Based on this signal, the ECM operates the PCV and VSV to control the fuel pressure in the common rail. (The fuel pressure in the common rail should be between 22 and 160 Mpa (220 and 1600 bars, 3,191 and 23,205 psi.)).

CAUTION:

Do not use an ohmmeter to check the fuel pressure sensor. Otherwise, the sensor may be broken.
The pressure in the fuel system can be too high (160 Mpa (1,600 bars, 23,205 psi)). Do not expose your eyes, hands and body to the leaked fuel.

DTC No.	DTC Detection Condition	Trouble Area	Possible to Detect
DTC No.	DTC Detection Condition	Trouble Area	Ignition Switch	Engine Run
P0191	The output from the fuel pressure sensor suddenly changes in a short period of time. (1 trip detection logic)	Fuel pressure sensor Fuel pressure sensor circuit ECM	ON	ON
P0192	The output voltage from the fuel pressure sensor is less than 0.19 V (0 Mpa (0 bars, 0 psi)). (1 trip detection logic)	Fuel pressure sensor Fuel pressure sensor circuit ECM	ON	ON
P0193	The output voltage from the fuel pressure sensor is more than 4.81 V (180 Mpa (1,800 bars, 26,106 psi)). (1 trip detection logic)	Fuel pressure sensor Fuel pressure sensor circuit ECM	ON	ON
P1164	Either the following condition (a) or (b) is met: (a) Rail pressure offset (b) The output pressure from fuel pressure sensor is more than the threshold. (1 trip detection logic)	Fuel pressure sensor Fuel pressure sensor circuit ECM	ON	-
P1165	Inconsistency between fuel pressure and PCV current (1 trip detection logic)	Fuel pressure sensor Fuel pressure sensor circuit ECM	-	-

It is piezo-resistive type absolute pressure sensor composed mainly of stress gauges linked to a measurement bridge.
The stress gauge distort the pressure and the result is a voltage signal proportional to the pressure.

FAIL-SAFE

DTC No.	Trouble Area	Possible to Detect
P0191	PCV controller in open loop. VCV adaptation deactivated. Fuel pressure is 35 to 80 MPa (350 to 800 bars, 5,076 to 11,603 psi).	Normal condition is restored.
P0192	PCV controller in open loop. VCV adaptation deactivated. Fuel pressure is 35 to 80 MPa (350 to 800 bars, 5,076 to 11,603 psi).	Normal condition is restored.
P0193	PCV controller in open loop. VCV adaptation deactivated. Fuel pressure is 35 to 80 MPa (350 to 800 bars, 5,076 to 11,603 psi).	Normal condition is restored.
P1164	PCV controller in open loop. VCV adaptation deactivated. Fuel pressure is 35 to 80 MPa (350 to 800 bars, 5,076 to 11,603 psi).	Normal condition is restored.
P1165	PCV controller in open loop. VCV adaptation deactivated. Fuel pressure is 35 to 80 MPa (350 to 800 bars, 5,076 to 11,603 psi).	Normal condition is restored.

WIRING DIAGRAM

INSPECTION PROCEDURE

Tech Tips

When DTC P0191, P0192, P0193, P1164 or P0115 is detected, check the fuel pressure by selecting the following menu items on the intelligent tester: Powertrain / Engine and ECT / Data List / Comn Rail Pres.
If the ECM is replaced, variant coding (variant coding indicates the presence of vehicle accessory items, A/C, etc.) should always be performed Click here.
Before removing the ECM and the peripheral parts, wait at least 3 minute after turning the ignition switch off (If the cooling fan is operating, remove the ECM and the peripheral parts after the fan stops.).

PROCEDURE

READ VALUE OF INTELLIGENT TESTER (FUEL PRESSURE)

Connect the intelligent tester to the DLC3.
Turn the ignition switch to the ON position and turn the intelligent tester on.
Clear the DTC Click here.
Start the engine.
Select the following menu items: Powertrain / Engine and ECT / Comn Rail Pres.

Read the value.

Standard

Condition	Specified Condition
Engine run	1 to 179 Mpa (10 to 1,790 bars, 145 to 25,961 psi)

Tech Tips

Check that the fuel pressure does not change significantly in a short period of time.

INSPECT ECM (VOLTAGE) Click here

CHECK FOR INTERMITTENT PROBLEMS

INSPECT ECM (VOLTAGE)

Disconnect the N5 fuel pressure sensor connector.
Turn the ignition switch to the ON position.

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

Standard voltage

Tester Connection	Specified Condition
VPC (N5-3) - Body ground	4.7 to 5.3 V

CHECK HARNESS AND CONNECTOR (FUEL PRESSURE SENSOR - ECM) Click here

CHECK HARNESS AND CONNECTOR (FUEL PRESSURE SENSOR - ECM)

Disconnect the B54 ECM connector.
Disconnect the N5 pressure sensor connector.

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

Standard resistance

Check for open

Tester Connection	Specified Condition
PC (B54-6) - PC (N5-1)	Below 1 Ω
EPC (B54-7) - EPC (N5-2)	Below 1 Ω

Check for short

Tester Connection	Specified Condition
PC (B54-6) or PC (N5-1) - Body ground	10 kΩ or higher
EPC (B54-7) or EPC (N5-2) - Body ground	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

REPLACE FUEL PRESSURE SENSOR

NEXT

CHECK IF DTC RECURS (P0191, P0192, P0193, P1164 AND/OR P1165)

Connect the intelligent tester to the DLC3.
Clear the DTC Click here.
Start the engine.
Turn the intelligent tester on.
Select the following menu items: Powertrain / Engine and ECT / DTC.

Read the DTCs displayed on the intelligent tester.

Result

Display (DTC output)	Proceed To
No output	A
DTC P0191, P0192, P0193, P1164 and/or P1165	B

REPLACE ECM

END