СИСТЕМА ECD, Diagnostic DTC:P14A0, P14A1

DTC Code DTC Name
P14A0 Exhaust Gas Back Pressure Sensor Circuit Low
P14A1 Exhaust Gas Back Pressure Sensor Circuit High

DESCRIPTION

The differential pressure sensor (exhaust gas pressure sensor) is fixed to the engine by a holder to protect it from high temperatures.

The differential pressure sensor (exhaust gas pressure sensor) is connected to the exhaust manifold via a hose and pipe, and detects the exhaust gas system pressure downstream of the oxidation catalyst.

The differential pressure sensor (exhaust gas pressure sensor) is supplied with 5 V from the ECM and has a measurement range between 60 kPa (0.6 bar) to 200 kPa (2.0 bar). This is equivalent to 1.875 to 4.5 V.

DTC No. DTC Detection Condition Trouble Area
P14A0

Differential pressure sensor (exhaust gas pressure sensor) value falls below lower permissible limit for 0.6 seconds or more

(3 trip detection logic)

  • Open or short in differential pressure sensor (exhaust gas pressure sensor) circuit

  • Differential pressure sensor (exhaust gas pressure sensor)

  • ECM
DTC No. DTC Detection Condition Trouble Area
P14A1

Differential pressure sensor (exhaust gas pressure sensor) value exceeds upper permissible limit for 0.6 seconds or more

(3 trip detection logic)

  • Open or short in differential pressure sensor (exhaust gas pressure sensor) circuit

  • Differential pressure sensor (exhaust gas pressure sensor)

  • ECM

WIRING DIAGRAM

A01IR66E55

INSPECTION PROCEDURE

Note

When replacing the ECM, the ECM needs Registration and Initialization Click here.

Tech Tips


  • When the ECM must be replaced, before replacing the ECM, perform the "Learning Values Save" function using the GTS. Then after installing the new ECM, perform all of the initialization/registrations for the "Learning Values Write" function by following the instructions shown on the GTS display.

  • Read freeze frame data using the GTS. Freeze frame data records the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, and other data from the time the malfunction occurred.

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (DIFFERENTIAL PRESSURE SENSOR - ECM)


    1. Disconnect the differential pressure sensor (exhaust gas pressure sensor) connector.

    2. Disconnect the ECM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      C81-1 (VC) - C84-70 (VCPX) Always Below 1 Ω
      C81-2 (PEX) - C84-85 (PEX) Always Below 1 Ω
      C81-3 (E2) - C84-71 (EPEX) Always Below 1 Ω
      C81-1 (VC) or C84-70 (VCPX) - Body ground Always 10 kΩ or higher
      C81-2 (PEX) or C84-85 (PEX) - Body ground Always 10 kΩ or higher
      C81-3 (E2) or C84-71 (EPEX) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR Click here

    OK

  2. CHECK HARNESS AND CONNECTOR (VC VOLTAGE)


    1. Disconnect the differential pressure sensor (exhaust gas pressure sensor) connector.

    2. Turn the ignition switch to ON.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      C81-1 (VC) - C81-3 (E2) Ignition switch ON 4.5 to 5.5 V

    NG

    REPLACE ECM Click here

    OK

  3. REPLACE DIFFERENTIAL PRESSURE SENSOR (EXHAUST GAS PRESSURE SENSOR)


    1. Replace the differential pressure sensor (exhaust gas pressure sensor) Click here.


    NEXT

  4. CHECK WHETHER DTC OUTPUT RECURS (DTC P14A0 AND/OR P14A1)


    1. Connect the GTS to the DLC3.

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

    3. Clear the DTCs Click here.

    4. Turn the ignition switch off and wait for 60 seconds or more [A].

    5. Perform road test [B].

    6. Repeat [A] and [B] for the number of trips detected.

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

    8. Read the DTCs.

      Result
      Result Proceed to
      No DTC output A
      DTC P14A0 and/or P14A1 B

    B

    REPLACE ECM Click here

    A

    END

  5. REPLACE ECM


    1. Replace the ECM Click here.


    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here

  6. REPAIR OR REPLACE HARNESS OR CONNECTOR


    1. Repair or replace the harness or connector.


    NEXT

  7. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED


    1. Connect the GTS to the DLC3.

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

    3. Clear the DTCs Click here.

    4. Turn the ignition switch off and wait for 60 seconds or more [A].

    5. Perform road test [B].

    6. Repeat [A] and [B] for the number of trips detected.

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

    8. Confirm that the DTC is not output again.


    NEXT

    END