ECD SYSTEM (w/o DPF), Diagnostic DTC:P0087, P0190, P0192, P0193

DESCRIPTION

The ECM monitors the internal fuel pressure of the common rail using the fuel pressure sensor, and controls the suction control valve to regulate the internal pressure to the target pressure. The pressure sensor is a semiconductor that varies electrical resistance when pressure is applied to its silicon chip. This sensor outputs the voltage in proportion to the internal fuel pressure.

MONITOR DESCRIPTION

P0087 (Fuel pressure sensor output stays at fixed value):

• Under normal conditions, the internal fuel pressure of the common rail usually fluctuates 1 to 2 MPa (10 to 20 kgf/cm², 145 to 290 psi) even when the driving conditions are constant. This DTC is stored if there is no fluctuation of the fuel pressure. The internal fuel pressure is approximately 27 to 37 MPa (275 to 377 kgf/cm², 3915 to 5365 psi) when idling, and it increases to approximately 50 to 70 MPa (510 to 714 kgf/cm², 7250 to 10150 psi) when running the engine at 2500 rpm.

  If this DTC is stored, the ECM enters fail-safe mode and limits engine power. The fail-safe mode continues until the ignition switch is turned off.

• The diagram below indicates that fuel pressure rises as engine speed increases, but for the malfunction indicated by this DTC, that does not happen.

  

P0190, P0192 and P0193 (Open or short in fuel pressure sensor circuit):

These DTCs are stored if the fuel pressure sensor output voltage is out of the standard range due to an open or short malfunction of the sensor circuit.

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

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1. CHECK DTC OUTPUT

   
   

   1. Connect the intelligent tester to the DLC3.

   2. Turn the ignition switch to ON and turn the tester on.

   3. Enter the following menus: Powertrain / Engine / DTC.

   4. Read the DTCs.

      Result

      Display (DTC output)	Proceed to
      P0190, P0192, P0193	A
      P0087	B

   
   

   B

   REPLACE FUEL PRESSURE SENSOR (COMMON RAIL (for Bank 1)) Click here

   A

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

   
   

   1. 

      Disconnect the fuel pressure sensor connector.

   2. Disconnect the ECM connector.

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

      Standard Resistance (Check for Open)
      for LHD Tester Connection Condition Specified Condition C82-2 (PR) - C45-69 (PCR1) Always Below 1 Ω C82-3 (VG) - C45-70 (VCM) Always Below 1 Ω C82-1 (E2) - C45-75 (E2) Always Below 1 Ω
      for RHD Tester Connection Condition Specified Condition C82-2 (PR) - C46-69 (PCR1) Always Below 1 Ω C82-3 (VG) - C46-70 (VCM) Always Below 1 Ω C82-1 (E2) - C46-75 (E2) Always Below 1 Ω

      Standard Resistance (Check for Short)
      for LHD Tester Connection Condition Specified Condition C82-2 (PR) or C45-69 (PCR1) - Body ground Always 10 kΩ or higher C82-3 (VG) or C45-70 (VCM) - Body ground Always 10 kΩ or higher C82-1 (E2) or C45-75 (E2) - Body ground Always 10 kΩ or higher
      for RHD Tester Connection Condition Specified Condition C82-2 (PR) or C46-69 (PCR1) - Body ground Always 10 kΩ or higher C82-3 (VG) or C46-70 (VCM) - Body ground Always 10 kΩ or higher C82-1 (E2) or C46-75 (E2) - Body ground Always 10 kΩ or higher

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR Click here

   OK

3. CHECK ECM (FUEL PRESSURE SENSOR VOLTAGE)

   

   
   

   1. Disconnect the fuel pressure sensor connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition C82-3 (VG) - C82-1 (E2) Ignition switch ON 4.5 to 5.5 V

   
   

   NG

   REPLACE ECM Click here

   OK

4. REPLACE FUEL PRESSURE SENSOR (COMMON RAIL (for Bank 1))

   
   

   1. Replace the common rail (for bank 1) Click here.

   
   

   NEXT

5. CHECK WHETHER DTC OUTPUT RECURS (DTC P0087, P0190, P0192, P0193)

   
   

   1. Connect the intelligent tester to the DLC3.

   2. Turn the ignition switch to ON and turn the tester on.

   3. Clear the DTCs Click here.

   4. Let the engine idle for 60 seconds, and then repeat quick engine speed accelerations (to 2500 rpm) for 30 seconds.

   5. Enter the following menus: Powertrain / Engine / DTC.

   6. Read the DTCs.

      Result

      Result	Proceed to
      P0087, P0190, P0192 or P0193 is output	A
      No DTC is output	B

   
   

   B

   END

   A

6. REPLACE ECM

   
   

   1. Replace the ECM Click here.

   
   

   NEXT

   CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here

7. REPAIR OR REPLACE HARNESS OR CONNECTOR

   
   

   NEXT

8. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

   
   

   1. Connect the intelligent tester to the DLC3.

   2. Clear the DTCs Click here.

   3. Turn the ignition switch off.

   4. Turn the ignition switch to ON.

   5. Let the engine idle for 60 seconds, and then repeat quick engine speed accelerations (to 2500 rpm) for 30 seconds.

   6. Confirm that the DTC is not output again.

      Tech Tips

      Perform the following procedure using the tester to determine whether or not the DTC judgment has been carried out.

      
      

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

      2. Input DTC P0087, P0190, P0192 and/or P0193.

      3. Check that STATUS is NORMAL. If STATUS is INCOMPLETE or UNKNOWN, increase idling time.

   
   

   NEXT

   END