[Gmecm] Shift light

[davesnothereman at netscape.net]

"Robin Handley" <Robin at FuryWorld.fsnet.co.uk> wrote:

>Anybody played with the shift light (pin A12) in a '727 
How 'bout a 7730?

or its equivalent in
>a '749?
Yyyep.

>
>Going by the circuit diagram for a '727, ignition volts are supplied to the
>non-ECM side of the shift light. My limited electrical knowledge tells me
>that the ECM ground this pin when it wants the light to come on. So, when it
>wants the light to be off, the pin should be at battery voltage. 
... when the light is connected to battery power.

>Is this
>right? Same deal for the injector pins?
When the injectors are connected to ignition power.

>
>Could be my minimalist installation causing bypasses in logic (although
>can't see why), but I see no voltage on the shift light pin, whether the RPM
>is below the light on threshold or not. Am I missing something?
Use a test light from power to the pin.  Much more dramatic and effective.  Check all variables for shift light.  Some may not do what they seem based on labels.  VSS may be needed (vehicle moving bit may need to be set).

Can send 7749 code with working shift light (on at WOT and 6300 ish rpm).

Zaphod
>
>Robin
>
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>

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