DTC P0852 Park/Neutral Switch Input Circuit High (At Model): Wiring Diagram

Engine electrical system, 2.5 L model (without push button start). See appropriate SYSTEM WIRING DIAGRAM article.
Engine electrical system, 2.5 L model (with push button start). See appropriate SYSTEM WIRING DIAGRAM article.

Fig 1: Park/Neutral Switch Input - Circuit Diagram (AT Model)
Courtesy of SUBARU OF AMERICA, INC.

DIAGNOSTIC PROCEDURE

Step	Check	Yes	No
1 CHECK SELECT CABLE.	Is there any fault in select cable?	Repair or adjust the select cable. Refer to SELECT CABLE .	Go to step 2 .
2 CHECK INPUT SIGNAL OF ECM. Turn the ignition switch to ON. Measure the voltage between ECM and chassis ground with select lever at "P" range and "N" range. Connector & terminal (B137) No. 16 (+) - Chassis ground (-):	Is the voltage less than 1 V?	Repair the poor contact of ECM connector.	Go to step 3 .
3 CHECK HARNESS BETWEEN ECM AND INHIBITOR SWITCH CONNECTOR. Turn the ignition switch to OFF. Disconnect the connectors from ECM and inhibitor switch. Measure the resistance of harness between ECM and inhibitor switch connector. Connector & terminal (B137) No. 16 - (T7) No. 6:	Is the resistance less than 1 Ω?	Go to step 4 .	Repair the harness and connector. NOTE: In this case, repair the following item: Open circuit in harness between ECM and inhibitor switch connector Poor contact of coupling connector
4 CHECK INHIBITOR SWITCH GROUND LINE. Measure the resistance of harness between inhibitor switch connector and engine ground. Connector & terminal (T7) No. 9 - Engine ground:	Is the resistance less than 5 Ω?	Replace the inhibitor switch. Refer to INHIBITOR SWITCH .	Repair the harness and connector. NOTE: In this case, repair the following item: Open circuit of harness between inhibitor switch connector and starter motor ground line Poor contact of coupling connector Poor contact of starter motor connector Poor contact of starter motor ground Starter motor