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

DESCRIPTION

The ECM monitors the internal fuel pressure of the common rail assembly (for bank 1) using the fuel pressure sensor, and controls the suction control valve to regulate the internal pressure so that it reaches the target pressure. The pressure sensor is a semiconductor that varies electrical resistance when pressure is applied to its silicon chip. This sensor outputs a 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 assembly usually fluctuates by 1000 to 2000 kPa (10 to 20 kgf/cm², 145 to 290 psi) even when driving conditions are constant. This DTC is stored if there is no fluctuation of the fuel pressure. The internal fuel pressure is approximately 27000 to 49000 kPa (275 to 500 kgf/cm², 3915 to 7105 psi) when idling, and it increases to approximately 57000 to 77000 kPa (581 to 785 kgf/cm², 8265 to 11165 psi) when running the engine at 3000 rpm.

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

WIRING DIAGRAM

CAUTION / NOTICE / HINT

PROCEDURE

1. CHECK DTC OUTPUT

   
   

   1. Connect the GTS to the DLC3.

   2. Turn the engine switch on (IG) and turn the GTS on.

   3. Enter the following menus: Engine and ECT / Trouble Codes.

   4. Read the DTCs.

      Result

      Result	Proceed to
      P0190, P0192 or P0193 is output	A
      P0087 is output	B

   
   

   B

   REPLACE COMMON RAIL ASSEMBLY (FOR BANK 1) (FUEL PRESSURE SENSOR) 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
      for LHD Tester Connection Condition Specified Condition C82-2 (PR) - C45-72 (PCR1) Always Below 1 Ω C82-3 (VC) - C45-118 (VCM) Always Below 1 Ω C82-1 (E2) - C45-95 (E2M) Always Below 1 Ω C82-2 (PR) or C45-72 (PCR1) - Body ground Always 10 kΩ or higher C82-3 (VC) or C45-118 (VCM) - Body ground Always 10 kΩ or higher
      for RHD Tester Connection Condition Specified Condition C82-2 (PR) - C46-72 (PCR1) Always Below 1 Ω C82-3 (VC) - C46-118 (VCM) Always Below 1 Ω C82-1 (E2) - C46-95 (E2M) Always Below 1 Ω C82-2 (PR) or C46-72 (PCR1) - Body ground Always 10 kΩ or higher C82-3 (VC) or C46-118 (VCM) - Body ground Always 10 kΩ or higher

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR Click here

   OK

3. CHECK ECM (FUEL PRESSURE SENSOR VOLTAGE)

   

   Text in Illustration

   *a	Front view of wire harness connector (to Fuel Pressure Sensor)

   
   

   1. Disconnect the fuel pressure sensor connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition C82-3 (VC) - C82-1 (E2) Engine switch on (IG) 4.5 to 5.5 V

   
   

   NG

   REPLACE ECM Click here

   OK

4. REPLACE COMMON RAIL ASSEMBLY (FOR BANK 1) (FUEL PRESSURE SENSOR)

   
   

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

   
   

   NEXT

5. BLEED AIR FROM FUEL SYSTEM

   
   

   1. Bleed the air from the fuel system Click here.

   2. Perform PM forced regeneration Click here.

      Tech Tips

      When fuel lines are disconnected, air may enter the fuel lines, leading to engine starting trouble. Therefore, perform forced regeneration and bleed the air from the fuel lines.

   
   

   NEXT

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

   
   

   1. Connect the GTS to the DLC3.

   2. Turn the engine switch on (IG) and turn the GTS on.

   3. Clear the DTCs Click here.

   4. Let the engine idle for 60 seconds, and then quickly increase the engine speed to 2500 rpm repeatedly for 30 seconds.

   5. Enter the following menus: Engine and ECT / Trouble Codes.

   6. Read the DTCs.

      Result

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

   
   

   B

   END

   A

7. REPLACE ECM

   
   

   1. Replace the ECM Click here.

   
   

   NEXT

   CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here

8. REPAIR OR REPLACE HARNESS OR CONNECTOR

   
   

   1. Repair or replace the harness or connector.

   
   

   NEXT

9. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

   
   

   1. Connect the GTS to the DLC3.

   2. Clear the DTCs Click here.

   3. Turn the engine switch off for 30 seconds or more.

   4. Turn the engine switch on (IG).

   5. Let the engine idle for 60 seconds, and then quickly increase the engine speed to 2500 rpm repeatedly for 30 seconds.

   6. Confirm that the DTC is not output again.

      Tech Tips

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

      
      

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

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

      3. Check that STATUS is NORMAL. If STATUS is INCOMPLETE or N/A, increase the idling time.

   
   

   NEXT

   END