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S Chassis Technical discussion related to the S Chassis such as the S12, S13, S14, and S15.


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Old 07-16-2018, 11:56 AM   #1
LoSt180
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The ECM detects the park/neutral position when continuity with ground exists.

When the gear position is in neutral, the PNP switch is "ON".

In electrical terms, the switch "closes" the circuit when in neutral, and "opens" the circuit in any other position.

Here's the circuit diagram for the neutral position switch. Drawing is the same for all S-chassis manuals I have on hand.



The KA 5th position and reverse switches function the same way.
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Old 07-16-2018, 02:06 PM   #2
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Quote:
Originally Posted by LoSt180 View Post
The ECM detects the park/neutral position when continuity with ground exists.

In electrical terms, the switch "closes" the circuit when in neutral, and "opens" the circuit in any other position.
The thing is, using a multimeter and probing the leads, this is not true.

In neutral I have zero, open, continuity. In gear I have continuity.

I think I am going to remove the switch, PITA to get to tho..and confirm my sanity as to whether is is NO or NC.

It's bee a long time since I had a tranny open, but I am not visioning how this would work - unless the switch is normally closed. I don't see any way the switch could be depressed in any shifter position other than neutral.
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