DTC P0108 - Manifold Absolute Pressure/Barometric Pressure Circuit High Input -

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

DTC DETECTING CONDITION:
- Detected simultaneously at occurrence of 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 CURRENT DATA. Start engine. Read the data of intake manifold absolute pressure 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 procedures, refer to the General Scan Tool Instruction Manual.	Is the measured value more than 119.5 kPa (896.5 mmHg, 35.29 inHg)?	Go to step 9.	Go to step 2.
2 CHECK INPUT SIGNAL FOR ECM. Measure voltage between ECM connector and chassis ground. Connector & terminal (B135) No. 3 (+) - Chassis ground (-):	Is the measured value more than 4.5 V?	Go to step 4.	Go to step 3.
3 CHECK INPUT SIGNAL FOR ECM. Measure voltage between ECM connector and chassis ground. Connector & terminal (B135) No. 3 (+) - Chassis ground (-):	Is the measured value more than 4.5 V when shaking harness and connector of ECM?	Repair poor contact in ECM connector.	Contact with SOA (distributor) service. NOTE: Inspection by DTM is required, because probable cause is deterioration of multiple parts.
4 CHECK INPUT SIGNAL FOR ECM. Measure voltage between ECM connector and chassis ground. Connector & terminal (B135) No. 15 (+) - Chassis ground (-):	Is the measured value less than 0.2 V?	Go to step 6.	Go to step 5.
5 CHECK INPUT SIGNAL FOR ECM. (USING SUBARU SELECT MONITOR.) Read data of atmospheric absolute pressure signal using Subaru Select Monitor. NOTE: Subaru Select Monitor For detailed operation procedure, refer to the "READ CURRENT DATA FOR ENGINE". < Ref. to SUBARU SELECT MONITOR . >	Is the measured value more than 13.3 kPa (100 mmHg, 3.94 inHg) when shaking harness and connector of ECM?	Repair poor contact in ECM connector.	Go to step 6.
6 CHECK HARNESS BETWEEN ECM AND PRESSURE SENSOR CONNECTOR. Turn ignition switch to OFF. Disconnect connector from pressure sensor. Turn ignition switch to ON. Measure voltage between pressure sensor connector and engine ground. Connector & terminal (E21) No. 3 (+) - Engine ground (-):	Is the measured value more than 4.5 V?	Go to step 7.	Repair open circuit in harness between ECM and pressure sensor connector.
7 CHECK HARNESS BETWEEN ECM AND PRESSURE SENSOR CONNECTOR. Turn ignition switch to OFF. Disconnect connector from ECM. Measure resistance of harness between ECM and pressure sensor connector. Connector & terminal (B135) No. 15 - (E21) No. 2: (B135)No. 19 - (E21) No. 1:	Is the measured value more than 1 Ω?	Go to step 8.	Repair open circuit in harness between ECM and pressure sensor connector.
8 CHECK POOR CONTACT. Check poor contact in pressure sensor connector.	Is there poor contact in pressure sensor connector?	Repair poor contact in pressure sensor connector.	Replace pressure sensor. < Ref. to PRESSURE SENSOR . >
9 CHECK HARNESS BETWEEN ECM AND PRESSURE SENSOR CONNECTOR. Turn ignition switch to OFF and Subaru Select Monitor or the general scan tool switch to OFF. Disconnect connector from pressure sensor. Turn ignition switch to ON and Subaru Select Monitor or the general scan tool switch to ON. Read data of intake manifold absolute pressure 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 procedures, refer to the General Scan Tool Instruction Manual.	Is the measured value more than 119.5 kPa (896.5 mmHg, 35.29 inHg)?	Repair battery short circuit in harness between ECM and pressure sensor connector.	Replace pressure sensor. < Ref. to PRESSURE SENSOR . >