ENGINE (DIAGNOSTICS)(H4SO) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)

DTC P0852 PARK/NEUTRAL SWITCH INPUT CIRCUIT HIGH (AT MODEL)

DTC DETECTING CONDITION:

Detected when two consecutive driving cycles with fault occur.

TROUBLE SYMPTOM:

Erroneous idling

CAUTION:

After repairing or replacing the defective part, perform the Clear Memory Mode and Inspection Mode .

WIRING DIAGRAM:

STEPCHECKYESNO

1.CHECK SELECT CABLE.

Are there any faults in the select cable?

Repair or adjust the select cable.

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 “N” and “P” range.

Connector & terminal

(B136) No. 31 (+) — Chassis ground (−):

Is the voltage less than 1 V?

Repair poor contact of the ECM connector.

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 and inhibitor switch connector.

Connector & terminal

(B136) No. 31 — (T7) No. 12:

Is the resistance less than 1 Ω?

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. 7 — Engine ground:

Is the resistance less than 5 Ω?

Replace the inhibitor switch.

Repair the harness and connector.

NOTE:

In this case, repair the following item:

• Open circuit in harness between inhibitor switch connector and starter motor ground line

• Poor contact of coupling connector

• Poor contact in starter motor connector

• Poor contact in starter motor ground

• Starter motor