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

WARNING: This page is about a different car, the 2013 Subaru Forester. However, it is still accessible from the selected car via links, so may be relevant.

Detected when two consecutive driving cycles with fault occur.
GENERAL DESCRIPTION < Refer to DTC P0068 MAP/MAF - THROTTLE POSITION CORRELATION , Diagnostic Trouble Code (DTC) Detecting Criteria. >

CAUTION: After servicing or replacing faulty parts, perform Clear Memory Mode < Refer to OPERATION , Clear Memory Mode. >, and Inspection Mode < Refer 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. Start the engine and warm up engine until coolant temperature is higher than 75°C (167°F). For AT models, set the select lever to "P" range or "N" range, and for MT models, place the shift lever in the neutral position. Turn the A/C switch to OFF. Turn all the accessory switches to OFF. 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". < Refer to SUBARU SELECT MONITOR . > General scan tool For detailed operation procedures, refer to the "General Scan Tool Instruction 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. < Refer 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". < Refer to SUBARU SELECT MONITOR . > General scan tool For detailed operation procedures, refer to the "General Scan Tool Instruction 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. < Refer 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. < Refer to MANIFOLD ABSOLUTE PRESSURE SENSOR . >	Replace the electronic throttle control. < Refer to THROTTLE BODY . >