Subaru Legacy BN/BS (2015-2019) Service Manual: Dtc p0852 park/neutral switch input circuit high

Subaru Legacy BN/BS (2015-2019) Service Manual / Engine (diagnostics)(h6do) / Diagnostic procedure with diagnostic trouble code (dtc) / Dtc p0852 park/neutral switch input circuit high

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 Clear Memory Mode > OPERATION, and Inspection Mode Inspection Mode > PROCEDURE.

WIRING DIAGRAM:

• Engine Electrical System ENGINE TYPE EZ (WITHOUT PUSH BUTTON START) Engine Electrical System > WIRING DIAGRAM

• Engine Electrical System ENGINE TYPE EZ (WITH PUSH BUTTON START) Engine Electrical System > WIRING DIAGRAM

STEP	CHECK	YES	NO
1.CHECK SELECT CABLE.	Is there any fault in select cable-	Repair or adjust the select cable. Select Cable	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P0852 PARK/NEUTRAL SWITCH INPUT CIRCUIT HIGH
2.CHECK INPUT SIGNAL OF ECM. 1) Turn the ignition switch to ON. 2) 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.	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P0852 PARK/NEUTRAL SWITCH INPUT CIRCUIT HIGH
3.CHECK HARNESS BETWEEN ECM AND INHIBITOR SWITCH CONNECTOR. 1) Turn the ignition switch to OFF. 2) Disconnect the connectors from ECM and inhibitor switch. 3) 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 --	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P0852 PARK/NEUTRAL SWITCH INPUT CIRCUIT HIGH	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 --	Replace the inhibitor switch. 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

1. OUTLINE OF DIAGNOSIS

Detect the open or short circuit of neutral SW.

Judge as NG when the ECM neutral terminal input differs from the reception data from TCM.

2. EXECUTION CONDITION

Secondary Parameters	Execution condition
Battery voltage	≥ 10.9 V
Starter relay feedback voltage	< Battery voltage - 0.35
Data received from TCM	= “P” range/“N” range

3. GENERAL DRIVING CYCLE

Perform the diagnosis only once after the enable conditions have been established.

4. DIAGNOSTIC METHOD

If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.

Judgment Value

Malfunction Criteria	Threshold Value
Voltage of the neutral position switch signal	≥ Battery voltage - 0.6

Time Needed for Diagnosis: 64 ms - 100 time(s)

Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.

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