DTC P0852 Neutral Switch Input Circuit High (Mt Model): Wiring Diagram

Fig 1: Neutral Switch Input Circuit High (MT Model) - Wiring Diagram

Courtesy of SUBARU OF AMERICA, INC.

DIAGNOSTIC PROCEDURE CHART

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 and chassis ground. Connector & terminal (B136) No. 31 (+) - Chassis ground (-):	Is the voltage less than 1 V?	Go to step 2.	Go to step 3.
2 CHECK POOR CONTACT. Check for poor contact of the ECM connector.	Is there poor contact in ECM connector?	Repair poor contact of the ECM connector.	Contact your SOA service center.
3 CHECK HARNESS BETWEEN ECM AND NEUTRAL SWITCH CONNECTOR. Turn the ignition switch to OFF. Disconnect connectors from the ECM and transmission harness. Measure the resistance of harness between ECM and transmission harness connector. Connector & terminal (B136) No. 31 - (T2) No. 2:	Is the resistance less than 1 Ω?	Go to step 4.	Repair the open circuit of harness between ECM and transmission harness connector.
4 CHECK HARNESS BETWEEN ECM AND NEUTRAL SWITCH CONNECTOR. Measure the resistance of harness between ECM and transmission harness connector. Connector & terminal (B136) No. 6 - (T2) No. 1:	Is the resistance less than 5 Ω?	Go to step 5.	Repair the harness and connector. NOTE: In this case, repair the following item: Open circuit of harness between transmission harness connector and engine ground Poor contact of coupling connector
5 CHECK NEUTRAL SWITCH. Place the shift lever in neutral. Measure the resistance between transmission harness connector terminals. Connector & terminal (T2)No. 1 - No.2:	Is the resistance less than 1 Ω?	Go to step 6.	Repair the open circuit of transmission harness, or replace the neutral switch.
6 CHECK POOR CONTACT. Check poor contact of transmission harness connector.	Is there poor contact in transmission harness connector?	Repair the poor contact of transmission harness connector.	Contact your SOA service center.