ENGINE (DIAGNOSTICS)(H4DOTC) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)

DTC P0852 NEUTRAL SWITCH INPUT CIRCUIT HIGH (MT MODEL)

DTC DETECTING CONDITION:

Detected when two consecutive driving cycles with fault occur.

TROUBLE SYMPTOM:

Improper idling

CAUTION:

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

WIRING DIAGRAM:

STEPCHECKYESNO

1.CHECK INPUT SIGNAL OF ECM.

1) Turn the ignition switch to ON.

2) Place the shift lever in neutral.

3) Measure the voltage between ECM and chassis ground.

Connector & terminal

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

Is the voltage less than 1 V?

Repair the poor contact of the ECM connector.

2.CHECK HARNESS BETWEEN ECM AND NEUTRAL POSITION SWITCH CONNECTOR.

1) Turn the ignition switch to OFF.

2) Disconnect connectors from the ECM and transmission harness connector (T9).

3) Measure the resistance of harness between ECM and transmission harness connector.

Connector & terminal

(B136) No. 31 — (B128) No. 1:

(B136) No. 6 — (B128) No. 3:

Is the resistance less than 1 Ω?

Repair the harness and connector.

NOTE:

In this case, repair the following item:

• Open circuit of harness between ECM and transmission harness connector

• Poor contact of coupling connector

3.CHECK NEUTRAL POSITION SWITCH.

1) Place the shift lever in neutral.

2) Measure the resistance between transmission harness connector terminals.

Connector & terminal

(T9) No. 1 — (T9) No. 3:

Is the resistance less than 1 Ω?

Repair the poor contact of transmission harness connector.

Repair the open circuit in transmission harness, or replace the neutral position switch.