DTC P0068 - Manifold Absolute Pressure/Barometric Pressure Circuit Range/Performance -

WARNING: This page is about a different variant/trim than selected.

DTC DETECTING CONDITION:
- Two consecutive driving cycles with malfunction
CAUTION: After repair or replacement of malfunctioning parts, conduct Clear Memory Mode < Ref. to OPERATION , CLEAR MEMORY MODE > and INSPECTION MODE < Ref. to OPERATION , INSPECTION MODE. >
WIRING DIAGRAM:

Fig 1: Manifold Absolute Pressure/Barometric Pressure Wiring Diagram
Courtesy of SUBARU OF AMERICA, INC.

DIAGNOSTIC PROCEDURE

Step	Check	Yes	No
1 CHECK ANY OTHER DTC ON DISPLAY.	Is any other DTC displayed?	Inspect the relevant 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. Start the engine and warm-up engine until coolant temperature is greater than 60°C (140°F). Place the shift lever in the selector lever in "N" or "P" position. Turn A/C switch to OFF. Turn all accessory switches to OFF. Read data of intake manifold pressure sensor signal using Subaru Select Monitor or general scan tool. Is the measured value within the specified range? NOTE: Subaru Select Monitor For detailed operation procedure, refer to the "READ CURRENT DATA FOR ENGINE". < Ref. to SUBARU SELECT MONITOR . > General scan tool For detailed operation procedure, refer to the General Scan Tool Instruction Manual. Specification:	Is the measured value within 73.3 to 106.6 kPa (550 to 800 mmHg, 21.65 to 31.50 inHg) when turning ignition switch ON, or within 20.0 to 46.7 kPa (150 to 350 mmHg, 5.91 to 13.78 inHg) when idling?	Go to step 4.	Replace intake air temperature sensor and pressure sensor. < Ref. to PRESSURE SENSOR . >
4 CHECK THROTTLE POSITION. Read data of throttle position signal using Subaru Select Monitor or general scan tool. NOTE: Subaru Select Monitor For detailed operation procedure, refer to the "READ CURRENT DATA FOR ENGINE". < Ref. to SUBARU SELECT MONITOR . > General scan tool For detailed operation procedure, refer to the General Scan Tool Instruction Manual.	Is the measured value less than 5% when throttle is fully closed?	Go to step 5.	Adjust or replace throttle position sensor. < Ref. to THROTTLE POSITION SENSOR . >
5 CHECK THROTTLE POSITION.	Is the measured value more than 85% when throttle is fully open.	Replace pressure sensor. < Ref. to PRESSURE SENSOR . >	Replace throttle position sensor. < Ref. to THROTTLE POSITION SENSOR . >