SAAB WIS ONLINE

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 the ignition switch to ON.

Set the shift lever to except neutral position.

Measure the voltage between ECM and chassis ground.

Connector & terminal

(B134) No. 8 (+) — Chassis ground (−):

Is the voltage less than 1 V?

Yes


No


CHECK INPUT SIGNAL FOR ECM.

Set the shift lever to neutral position.

Measure the voltage between ECM and chassis ground.

Connector & terminal

(B134) No. 8 (+) — Chassis ground (−):

Is the voltage more than 10 V?

Yes


No


CHECK POOR CONTACT.

Check poor contact in ECM connector.

Is there poor contact in ECM connector?

Yes

Repair the poor contact in ECM connector.


No

Contact Service Center.


CHECK INPUT SIGNAL FOR ECM.

Disconnect ECM connector from ECM.

Measure the voltage between ECM and chassis ground.

Connector & terminal

(B134) No. 8 (+) — Chassis ground (−):

Is the voltage more than 10 V?

Yes

Repair the battery short circuit in harness between ECM and transmission connector.


No


CHECK HARNESS BETWEEN ECM AND TRANSMISSION HARNESS CONNECTOR.

Turn the ignition switch to OFF.

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

Measure the resistance of harness between ECM and neutral switch connector.

Connector & terminal

(B134) No. 8 — (B128) No. 1:

Is the resistance less than 1 Ω?

Yes


No

• Repair the harness and connector.

•
Note

In this case, repair the following:

• Open circuit in harness between ECM and transmission harness

• Poor contact in transmission harness connector

• Poor contact in ECM connector



CHECK NEUTRAL POSITION SWITCH GROUND LINE.

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

Connector & terminal

(B128) No. 3 — Engine ground:

Is the resistance less than 5 Ω?

Yes


No

Repair the open circuit in harness of neutral position switch ground line.


CHECK NEUTRAL POSITION SWITCH.

Set the shift lever to except neutral position.

Measure the resistance between transmission harness connector receptacle’s terminals.

Terminals

No. 1 — No. 3:

Is the resistance less than 1 Ω?

Yes


No

Replace the neutral position switch.


CHECK POOR CONTACT.

Check poor contact in the transmission harness connector.

Is there poor contact in the transmission harness connector?

Yes

Repair poor contact in transmission harness connector.


No

Contact Service Center.