P0191

FA20 ENGINE CONTROL: SFI SYSTEM: P0191-P0193; Fuel Rail Pressure Sensor Circuit Range / Performance; 2013 MY FR-S [03/2012 -]
P0191 - Fuel Rail Pressure Sensor Circuit Range / Performance
P0192 - Fuel Rail Pressure Sensor Circuit Low Input
P0193 - Fuel Rail Pressure Sensor Circuit High Input

DESCRIPTION

The fuel pressure sensor is installed on the delivery pipe. The sensor changes fuel pressure to an electrical signal and sends the signal to the ECM. Then the ECM controls the pump discharge using this feedback to maintain the fuel's target pressure. If the sensor output stops, the ECM will stop the high pressure side fuel pump and supply fuel using the low pressure side fuel pump.

HINT
After confirming DTC P0192 or P0193, use the Techstream to confirm the fuel pressure in the delivery pipe by entering the following menus: Powertrain / Engine / Data List / Fuel Press.

MONITOR DESCRIPTION

These DTCs are set if the fuel pressure sensor output voltage is out of the standard range. The DTCs stand for an open or short malfunction of the sensor circuit.

If these DTCs are set, the ECM enters fail-safe mode and limits the engine power. Fail-safe mode continues until the ignition switch is turned off.

MONITOR STRATEGY

TYPICAL ENABLING CONDITIONS

All

P0191 (Stuck High Monitor)

P0191 (Stuck Low Monitor)

TYPICAL MALFUNCTION THRESHOLDS

P0191 (Stuck High Monitor)

P0191 (Stuck Low Monitor)

P0192

P0193

COMPONENT OPERATING RANGE

CONFIRMATION DRIVING PATTERN

P0191

* Connect the Techstream to the DLC3.

* Turn the ignition switch to ON and turn the Techstream on.

* Clear DTCs (even if no DTCs are stored, perform the clear DTC operation) Reading and Clearing Diagnostic Trouble Codes.

* Turn the ignition switch off and wait for at least 30 seconds.

* Turn the ignition switch to ON.

* Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher.

* With the vehicle stationary, depress the accelerator pedal and maintain an engine speed of between 2500 and 3000 rpm for 40 seconds or more.

* Drive the vehicle at 30 km/h (18.75 mph) or more for 1 minute or more [A].

CAUTION:
When performing the confirmation driving pattern, obey all speed limits and traffic laws.

* Turn the ignition switch off and leave vehicle for 5 hours or more [B].

* Turn the ignition switch to ON and turn the Techstream on.

* Enter the following menus: Powertrain / Engine / Trouble Codes.

* Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher.

* Drive the vehicle at 30 km/h (18.75 mph) or more for 1 minute or more [C].

CAUTION:
When performing the confirmation driving pattern, obey all speed limits and traffic laws.

* Read pending DTCs.

HINT
* If a pending DTC is output, the system is malfunctioning.
* If a pending DTC is not output, perform the following procedure.

* Enter the following menus: Powertrain / Engine / Utility / All Readiness.

* Input the DTC: P0191.

* Check the DTC judgment result.

HINT
* If the judgment result shows NORMAL, the system is normal.
* If the judgment result shows ABNORMAL, the system has a malfunction.

* If the test result is INCOMPLETE or N/A and no DTC is output, perform a universal trip and check for permanent DTCs Reading and Clearing Diagnostic Trouble Codes.

HINT
* If a permanent DTC is output, the system is malfunctioning.
* If no permanent DTC is output, the system is normal.

P0192, P0193

* Connect the Techstream to the DLC3.

* Turn the ignition switch to ON and turn the Techstream on.

* Clear DTCs (even if no DTCs are stored, perform the clear DTC operation) Reading and Clearing Diagnostic Trouble Codes.

* Turn the ignition switch off and wait for at least 30 seconds.

* Turn the ignition switch to ON and turn the Techstream on.

* Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher.

* With the vehicle stationary, depress the accelerator pedal and maintain an engine speed of between 2500 and 3000 rpm for 40 seconds or more [A].

* Drive the vehicle at 10 km/h (6.25 mph) or more for 1 minute or more [B].

CAUTION:
When performing the confirmation driving pattern, obey all speed limits and traffic laws.

* Enter the following menus: Powertrain / Engine / Trouble Codes.

* Read pending DTCs.

HINT
* If a pending DTC is output, the system is malfunctioning.
* If a pending DTC is not output, perform the following procedure.

* Enter the following menus: Powertrain / Engine / Utility / All Readiness.

* Input the DTC: P0192 or P0193.

* Check the DTC judgment result.

INSPECTION PROCEDURE

HINT
Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.

PROCEDURE

1. READ VALUE USING TECHSTREAM (FUEL PRESS)

(a) Connect the Techstream to the DLC3.

(b) Start the engine.

(c) Turn the Techstream on.

(d) Enter the following menus: Powertrain / Engine / Data List / Fuel Press.

(e) Read the values.

Result:

HINT
*: The value must change when the engine is moving or stationary.

B -- CHECK FOR INTERMITTENT PROBLEMS Check For Intermittent Problems
A -- Continue to next step.

2. INSPECT FUEL PRESSURE SENSOR (FUEL PRESSURE SENSOR POWER SOURCE)

(a) Disconnect the fuel pressure sensor connector.

(b) Turn the ignition switch to ON.

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

Standard Voltage:

NG -- CHECK HARNESS AND CONNECTOR (ECM - FUEL PRESSURE SENSOR)
OK -- Continue to next step.

3. INSPECT ECM (PR VOLTAGE)

(a) Start the engine.

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

Standard Voltage:

HINT
The fuel pressure in the delivery pipe is 3 to 5 MPa.

NG -- CHECK HARNESS AND CONNECTOR (ECM - FUEL PRESSURE SENSOR)

OK -- REPLACE ECM Removal

4. CHECK HARNESS AND CONNECTOR (ECM - FUEL PRESSURE SENSOR)

(a) Disconnect the ECM connectors.

(b) Disconnect the fuel pressure sensor connector.

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

Standard Resistance (Check for open):

Standard Resistance (Check for short):

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (ECM - FUEL PRESSURE SENSOR)

OK -- REPLACE FUEL PRESSURE SENSOR Removal

5. CHECK HARNESS AND CONNECTOR (ECM - FUEL PRESSURE SENSOR)

(a) Disconnect the fuel pressure sensor connector.

(b) Disconnect the ECM connector.

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

Standard Resistance (Check for open):

Standard Resistance (Check for short):

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (ECM - FUEL PRESSURE SENSOR)

OK -- REPLACE ECM Removal