A9L Mustang Computer

[ransil]

The plug is to select the type of ECU used. Actual type of trans does not matter.

It is 12V in crank then when cranking stops it essentially goes to ground. Only connect the purple-yellow wire to this IF you have an auto type ECU. If you connect this with a manual type ECU bad things will happen inside the ECU.

Having it connected to the start wire ( auto computer only) on the solenoid gets +12v when cranking when in the run position the ground comes from the coil in the solenoid.

Pin 30 must be connected properly or you will not be able to pull codes and it will cause idle problems.

 

[yjzonie]

How do you verify if you have an AUTO or Manual ECM.

 

[Viperwolf1]

How do you verify if you have an AUTO or Manual ECM.

Whats the code on it?

 

[yjzonie]

A9L from an 89 Mustang GT

 

[IFLYHOOKS]

A9L from an 89 Mustang GT

A9L is from a manual transmission Mustang. See this link: http://fordfuelinjection.com/?p=62 (Article #2) for a better explanation of ECM's.