DTC P0852: Park/Neutral Switch Input Circuit High: Notes

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

DTC detecting condition:

Detected when two consecutive driving cycles with fault occur.

Trouble symptom:

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.

Wiring diagram:

Engine Electrical System Ref. to WIRING DIAGRAM , Engine Electrical System.

Fig 1: Park/Neutral Switch Wiring Diagram

Courtesy of SUBARU OF AMERICA, INC.

Step	Check	Yes	No
1 CHECK SELECT CABLE.	Is there any fault in select cable?	Repair or adjust the select cable. Ref. 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 (B134) No. 5 (+) - 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 connector from ECM. Disconnect the connector from inhibitor switch. Measure the resistance of harness between ECM connector and inhibitor switch connector. Connector & terminal (B134) No. 5 - (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: Blown out of fuse Open circuit in harness between ECM connector 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. Ref. 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