DTC P0108 Manifold Absolute Pressure/Barometric Pressure Circuit High Input

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

DTC DETECTING CONDITION:

Immediately at fault recognition
GENERAL DESCRIPTION < Ref. to DTC P0108 MANIFOLD ABSOLUTE PRESSURE/BAROMETRIC PRESSURE CIRCUIT HIGH INPUT , Diagnostic Trouble Code (DTC) Detecting Criteria. >

CAUTION: After repairing or replacing the defective part, perform the Clear Memory Mode < Ref. to OPERATION , Clear Memory Mode. > and Inspection Mode < Ref. to PROCEDURE , Inspection Mode. >.

WIRING DIAGRAM:

Fig 1: Manifold Absolute Pressure/Barometric Pressure Circuit High Input - Wiring Diagram

DIAGNOSIS PROCEDURE

Step	Check	Yes	No
1 CHECK CURRENT DATA. Start the 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 "READ CURRENT DATA FOR ENGINE". < Ref. to SUBARU SELECT MONITOR . > General scan tool For detailed operation procedure, refer to the general scan tool operation manual.	Is the measured value more than 119.5 kPa (896.5 mmHg, 35.29 inHg) ?	Go to step 10.	Go to step 2.
2 CHECK OUTPUT SIGNAL OF ECM. Measure the voltage between ECM connector and chassis ground. Connector & terminal (B134) No. 19 (+) - Chassis ground (-):	Is the voltage more than 4.5 V?	Go to step 4.	Go to step 3.
3 CHECK OUTPUT SIGNAL OF ECM. Measure the voltage between ECM connector and chassis ground. Connector & terminal (B134) No. 19 (+) - Chassis ground (-):	Does the voltage change by shaking the ECM harness and connector?	Repair the poor contact of ECM connector.	Contact the SOA service center.
4 CHECK INPUT SIGNAL OF ECM. Measure the voltage between ECM connector and chassis ground. Connector & terminal (B134) No. 6 (+) - Chassis ground (-):	Is the voltage less than 0.2 V?	Go to step 6.	Go to step 5.
5 CHECK INPUT SIGNAL FOR ECM (USING SUBARU SELECT MONITOR). Read the data of atmospheric absolute pressure signal using Subaru Select Monitor. NOTE: Subaru Select Monitor For detailed operation procedure, refer to "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 the ECM harness and connector?	Repair the poor contact of ECM connector.	Go to step 6.
6 CHECK HARNESS BETWEEN ECM AND MANIFOLD ABSOLUTE PRESSURE SENSOR CONNECTOR. Turn the ignition switch to OFF. Disconnect the connector from manifold absolute pressure sensor. Turn the ignition switch to ON. Measure the voltage between manifold absolute pressure sensor connector and engine ground. Connector & terminal (E21) No. 3 (+) - Engine ground (-):	Is the voltage more than 4.5 V?	Go to step 7.	Repair the open circuit of harness between ECM and manifold absolute pressure sensor connector.
7 CHECK HARNESS BETWEEN ECM AND MANIFOLD ABSOLUTE PRESSURE SENSOR CONNECTOR. Turn the ignition switch to OFF. Disconnect the connectors from ECM. Measure the resistance of harness between ECM and manifold absolute pressure sensor connector. Connector & terminal (B134) No. 6 - (E21) No. 1:	Is the resistance less than 1 Ω?	Go to step 8.	Repair the open circuit of harness between ECM and manifold absolute pressure sensor connector.
8 CHECK HARNESS BETWEEN ECM AND MANIFOLD ABSOLUTE PRESSURE SENSOR CONNECTOR. Measure the resistance of harness between ECM and manifold absolute pressure sensor connector. Connector & terminal (B134) No. 29 - (E21) No. 2:	Is the resistance less than 1 Ω?	Go to step 9.	Repair the open circuit of harness between ECM and manifold absolute pressure sensor connector.
9 CHECK POOR CONTACT. Check poor contact of manifold absolute pressure sensor connector.	Is there poor contact in manifold absolute pressure sensor connector?	Repair the poor contact of manifold absolute pressure sensor connector.	Replace the manifold absolute pressure sensor. < Ref. to MANIFOLD ABSOLUTE PRESSURE SENSOR . >
10 CHECK HARNESS BETWEEN ECM AND MANIFOLD ABSOLUTE PRESSURE SENSOR CONNECTOR. Turn the ignition switch to OFF and Subaru Select Monitor or the general scan tool switch to OFF. Disconnect the connector from manifold absolute pressure sensor. Turn the ignition switch to ON, and the Subaru Select Monitor or general scan tool power switch to ON. 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 "READ CURRENT DATA FOR ENGINE". < Ref. to SUBARU SELECT MONITOR . > General scan tool For detailed operation procedure, refer to the general scan tool operation manual.	Is the measured value more than 119.5 kPa (896.5 mmHg, 35.29 inHg) ?	Repair the battery short circuit of harness between ECM and manifold absolute pressure sensor connector.	Replace the manifold absolute pressure sensor. < Ref. to MANIFOLD ABSOLUTE PRESSURE SENSOR . >