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Home >> Saab >> 2005 >> 9-2X Linear, 251, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine (Diagnostics) - 2.5L >> Diagnostic Procedure With DTC >> DTC P0851: Neutral Switch Input Circuit Low (M/T Model) >> Wiring Diagram: >> Check Harness Between ECM & Neutral Position Switch Connector
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Check Harness Between ECM & Neutral Position Switch Connector

Measure the resistance between ECM and chassis ground.

Connector & terminal 

(B137) No. 9 - Chassis ground: 

Is the resistance more than 1 MO? 

YES. Go to next step. 

NO 

Repair ground short circuit in harness between ECM and transmission harness 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 O? 

YES. Go to next step. 

NO 

Repair open circuit in harness between ECM and transmission harness 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 O? 

YES. Go to next step. 

NO 

Repair open circuit between transmission harness connector and engine ground terminal.

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