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HOMESERVICE MANUALSSUBARU2005OUTBACK I, STANDARDREPAIR AND DIAGNOSISENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROLS - ENGINE (DIAGNOSTICS) (H4SO)DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)DTC P0068 MAP/MAF - THROTTLE POSITION CORRELATION
2005 Subaru Outback i, Standard

DTC P0068 Map/MAF - Throttle Position Correlation

2005 Subaru Outback i, StandardSECTION DTC P0068 Map/MAF - Throttle Position Correlation

DTC DETECTING CONDITION: 

CAUTION: After repair or replacement of faulty parts, conduct CLEAR MEMORY MODE < Ref. to , OPERATION , Clear Memory Mode.> and INSPECTION MODE < Ref. to , PROCEDURE , Inspection Mode.>.

WIRING DIAGRAM: 

Fig 1: DTC P0068 MAP/MAF Circuit
G03828447Courtesy of SUBARU OF AMERICA, INC.
DTC P0068 MAP/MAF - THROTTLE POSITION CORRELATION DIAGNOSIS

Step Check Yes No
1. CHECK FOR ANY OTHER DTC ON DISPLAY.  Is any other DTC displayed? Inspect DTC using "List of Diagnostic Trouble Code DTC". < Ref. to , LIST OF DIAGNOSTIC TROUBLE CODE (DTC) . > Go to step 2. 
2. CHECK AIR INTAKE SYSTEM.  Are there holes, loose bolts or disconnection of hose on air intake system? Repair air intake system. Go to step 3. 
3. CHECK PRESSURE SENSOR. 
  1. Start the engine and warm-up engine until coolant temperature is greater than 60°C (140°F).
  2. Place the selector lever or shift lever in "P" or "N" position.
  3. Turn the A/C switch to OFF.
  4. All accessory switches OFF.
  5. Read the data of intake manifold pressure sensor signal using Subaru Select Monitor or OBD-II general scan tool.
NOTE:
  • Subaru Select Monitor

    For detailed operation procedures, refer to "READ CURRENT DATA FOR ENGINE". < Ref. to , SUBARU SELECT MONITOR . >

  • OBD-II general scan tool

    For detailed operation procedures, refer to the OBD-II general scan tool instruction manual .

 Ignition ON: Is the measured value 73.3 - 106.6 kPa (550 - 800 mmHg, 21.65 - 31.50 inHg)? Idling: Is the measured value 20.0 - 46.7 kPa (150 - 350 mmHg, 5.91 -13.78 inHg)? Go to step 4  . Replace the manifold absolute pressure sensor. < Ref. to MANIFOLD ABSOLUTE PRESSURE SENSOR . >
4. CHECK THROTTLE POSITION. 
Read the data of throttle position signal using Subaru Select Monitor or OBD-II general scan tool.
NOTE:
  • Subaru Select Monitor

    For detailed operation procedures, refer to "READ CURRENT DATA FOR ENGINE". < Ref. to , SUBARU SELECT MONITOR . >

  • OBD-II general scan tool

    For detailed operation procedures, refer to the OBD-II general scan tool instruction manual .

 Is the measured value less than 5% when throttle is fully closed? Go to step 5.  Adjust or replace the throttle position sensor. < Ref. to THROTTLE POSITION SENSOR . >
5. CHECK THROTTLE POSITION.  Is the measured value more than 85% when throttle is wide open? Replace the manifold absolute pressure sensor. < Ref. to MANIFOLD ABSOLUTE PRESSURE SENSOR . > Replace the throttle position sensor < Ref. to THROTTLE POSITION 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.