DTC P0852 Park/Neutral Switch Input Circuit High: Trouble Symptom

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

Improper idling

CAUTION: After servicing or replacing faulty parts, perform Clear Memory Mode < Ref. to OPERATION , Clear Memory Mode. >, and Inspection Mode < Ref. to PROCEDURE , Inspection Mode. >.

Engine Electrical System ENGINE TYPE EJ (WITHOUT PUSH BUTTON START) Ref. to the appropriate SYSTEM WIRING diagram article. ENGINE TYPE EJ (WITHOUT PUSH BUTTON START).
Engine Electrical System ENGINE TYPE EJ (WITH PUSH BUTTON START) Ref. to the appropriate SYSTEM WIRING diagram article. ENGINE TYPE EJ (WITH PUSH BUTTON START).

Fig 1: Engine Electrical System - Wiring Diagram (Engine Type EJ)
Courtesy of SUBARU OF AMERICA, INC.

DIAGNOSTIC PROCEDURE

Step	Check	Yes	No
1 CHECK INPUT SIGNAL OF ECM. Turn the ignition switch to ON. Place the shift lever in neutral. Measure the voltage between ECM connector and chassis ground. Connector & terminal (B136) No. 35 (+) - Chassis ground (-):	Is the voltage less than 1 V?	Repair the poor contact of ECM connector.	Go to step 2.
2 CHECK HARNESS BETWEEN ECM AND NEUTRAL POSITION SWITCH CONNECTOR. Turn the ignition switch to OFF. Disconnect the connectors from ECM and neutral position switch. Measure the resistance of harness between ECM connector and transmission harness connector. Connector & terminal (B136) No. 35 - (T12) No. 1: (B136) No. 4 - (T12) No. 2:	Is the resistance less than 1 Ω?	Go to step 3.	Repair the harness and connector. NOTE: In this case, repair the following item: Open circuit in harness between ECM connector and transmission harness connector Poor contact of coupling connector
3 CHECK NEUTRAL POSITION SWITCH. Place the shift lever in neutral. Measure the resistance between transmission harness connector terminals. Connector & terminal (T2) No. 1 - (T2) No. 2:	Is the resistance less than 1 Ω?	Repair the poor contact of transmission harness connector.	Replace the neutral position switch. < Ref. to NEUTRAL POSITION SWITCH . >