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HOMESERVICE MANUALSSUBARU2016LEGACY 2.5IREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT VARIANT/TRIMSECTION 12 (ENGINE CONTROLS (H6DO) (DIAGNOSTICS) (1 OF 5))DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)DTC P0068 MAP/MAF - THROTTLE POSITION CORRELATIONDTC DETECTING CONDITION
2016 Subaru Legacy 2.5i

DTC P0068 Map/MAF - Throttle Position Correlation: DTC Detecting Condition

2016 Subaru Legacy 2.5iSECTION DTC Detecting Condition
WARNING: This page is about a different variant/trim than selected.

Detected when two consecutive driving cycles with fault occur.

CAUTION: After servicing or replacing faulty parts, perform Clear Memory Mode < Ref. to OPERATION , Clear Memory Mode. >, and Inspection Mode < Ref. to PROCEDURE , Inspection Mode. >.
DIAGNOSTIC PROCEDURE

Step Check Yes No
1 CHECK AIR INTAKE SYSTEM.  Are there holes, loose bolts or disconnection of hose on air intake system? Repair the air intake system. Go to step 2  .
2 CHECK MANIFOLD ABSOLUTE PRESSURE SENSOR. 
  1. Start the engine and warm up engine until coolant temperature is higher than 75°C (167°F).
  2. Place the select lever in "P" range or "N" range.
  3. Turn the A/C switch to OFF.
  4. Turn all the accessory switches to OFF.
  5. Read the value of «Mani. Absolute Pressure » using the Subaru Select Monitor or a general scan tool.
    NOTE:
    • Subaru Select Monitor

      For detailed operation procedures, refer to "Read Current Data For Engine". < Ref. to SUBARU SELECT MONITOR . >

    • General scan tool

      For detailed operation procedures, refer to the general scan tool operation manual.

 Is the value in «Mani. Absolute Pressure» 73.3 - 106.6 kPa (550 - 800 mmHg, 21.65 - 31.50 inHg) when the ignition is turned ON, and 20.0 - 46.7 kPa (150 - 350 mmHg, 5.91 - 13.78 inHg) during idling? Go to step 3  . Replace the manifold absolute pressure sensor. < Ref. to MANIFOLD ABSOLUTE PRESSURE SENSOR . >
3 CHECK THROTTLE OPENING ANGLE. 
Using the Subaru Select Monitor or a general scan tool, read the value in «Throttle Opening Angle».
NOTE:
  • Subaru Select Monitor

    For detailed operation procedures, refer to "Read Current Data For Engine". < Ref. to SUBARU SELECT MONITOR . >

  • General scan tool

    For detailed operation procedures, refer to the general scan tool operation manual.

 Is the value in «Throttle Opening Angle» with the throttle fully closed less than 5%? Go to step 4  . Replace the electronic throttle control. < Ref. to THROTTLE BODY . >
4 CHECK THROTTLE OPENING ANGLE.  Is the value in «Throttle Opening Angle» with the throttle fully open 85% or more? Replace the manifold absolute pressure sensor. < Ref. to MANIFOLD ABSOLUTE PRESSURE SENSOR . > Replace the electronic throttle control. < Ref. to THROTTLE BODY . >
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.