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HOMESERVICE MANUALSSUBARU2022IMPREZA BASE, 4D SEDAN, AUTOMATIC CVT TRANSREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 27 (ENGINE CONTROL SYSTEM (HEV) (DIAGNOSTICS) (1 OF 4))DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)DTC P0068: MAP/MAF - THROTTLE POSITION CORRELATIONNOTES
2022 Subaru Impreza Base, 4D Sedan, Automatic CVT Trans

DTC P0068: Map/MAF - Throttle Position Correlation: Notes

2022 Subaru Impreza Base, 4D Sedan, Automatic CVT TransSECTION Notes
WARNING: This page is about a different car, the 2022 Subaru Crosstrek. However, it is still accessible from the selected car via links, so may be relevant.

1. - 

DTC detecting condition: 

Detected when two consecutive driving cycles with fault occur.

NOTE:

After the faulty parts are repaired or replaced, perform the final check in Basic Diagnostic Procedure. Ref. to  ENGINE (DIAGNOSTICS) (H4DO(HEV))>BASIC DIAGNOSTIC PROCEDURE>PROCEDURE  . 

  1. CHECK AIR INTAKE SYSTEM  .

    Check the installing condition of the air intake system.

    Are there holes, loose bolts or disconnection of hose on air intake system?

    Yes:  Repair the air intake system.

    No:  Go to  2.

  2. CHECK MANIFOLD ABSOLUTE PRESSURE SENSOR  .
    1. Turn the ignition switch to ON.
    2. Navigate to Inspection Mode for measuring Exhaust Gas. Ref. to P-HEV HYBRID POWERTRAIN CONTROL (DIAGNOSTICS)>WORK SUPPORT>OPERATION>SERVICE MODE .
      NOTE:

      If it is necessary to run the engine for 10 minutes or more, fasten the driver's seat belt. 

    3. Start the engine.
    4. Warm up the engine until coolant temperature is higher than 75°C (167°F).
    5. Place the select lever in "P" range or "N" range.
    6. Turn the A/C switch to OFF.
    7. Turn all the accessory switches to OFF.
    8. Using the Subaru Select Monitor, read the value in [Mani. Absolute Pressure].
    NOTE:

    For detailed operation procedures, refer to "Common (Diagnostics)". Ref. to  COMMON (DIAG)>DATA MONITOR  . 

    Is the value of [Mani. Absolute Pressure] 73.3 - 106.6 [kPa] (550 - 800 mmHg, 21.6 - 31.5 inHg, 10.6 - 15.5 psi) at ignition ON, and 20 - 46.7 [kPa] (150 - 350 mmHg, 5.91 - 13.79 inHg, 2.9 - 6.8 psi) at idling?

    Yes:  Repair the poor contact of ECM connector.

    No:  Replace the manifold absolute pressure sensor. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO(HEV))>MANIFOLD ABSOLUTE PRESSURE SENSOR .

RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.