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DTC P0852 NEUTRAL SWITCH INPUT CIRCUIT HIGH (MT MODEL)

DTC P0852 NEUTRAL SWITCH INPUT CIRCUIT HIGH (MT MODEL)

DTC DETECTING CONDITION:


• Two consecutive driving cycles with fault

• GENERAL DESCRIPTION


TROUBLE SYMPTOM:

Erroneous idling

Important

After repair or replacement of faulty parts, conduct Clear Memory Mode and Inspection Mode .


WIRING DIAGRAM:


CHECK INPUT SIGNAL FOR ECM.

Turn ignition switch to ON.

Place the shift lever in a position except for neutral.

Measure the voltage between ECM and chassis ground.

Connector & terminal

(B137) No. 9 (+) — Chassis ground (−):

Is the voltage more than 5 V?

Yes


No


CHECK INPUT SIGNAL FOR ECM.

Place the shift lever in a position except for neutral.

Measure the voltage between ECM and chassis ground.

Connector & terminal

(B137) No. 9 (+) — Chassis ground (−):

Is the voltage less than 1 V?

Yes


No


CHECK FOR POOR CONTACT.

Check for poor contact in ECM connector.

Is there poor contact in ECM connector?

Yes

Repair poor contact in ECM connector.


No

Contact Service Center.


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?

Yes


No

Repair open circuit in transmission harness or replace neutral switch.


CHECK HARNESS BETWEEN ECM AND NEUTRAL SWITCH CONNECTOR.

Disconnect the connector from ECM.

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

Connector & terminal

(B137) No. 9 — (B25) No. 1:

Is the resistance less than 1 Ω?

Yes


No

Repair open circuit in harness between ECM and transmission harness connector.


CHECK HARNESS BETWEEN ECM AND NEUTRAL SWITCH CONNECTOR.

Measure the resistance of harness between transmission harness connector and engine ground.

Connector & terminal

(B25) No. 2 — Engine ground:

Is the resistance less than 5 Ω?

Yes


No

• Repair harness and connector.

•
Note

In this case, repair the following:

• Open circuit in harness between transmission harness connector and engine ground

• Poor contact in coupling connector



CHECK FOR POOR CONTACT.

Check for poor contact in transmission harness connector.

Is there a poor contact in the transmission harness connector?

Yes

Repair poor contact in transmission harness connector.


No

Contact Service Center.