Does anyone know how to use the D-check mode? All I can find in the manual is have the "Read memory connector" diconnected and the "Test Mode Connector" connected. Later it states "This mode is used by the dealer to check the entire SPFI system and detect faulty parts." Is there more and I am not finding it? Please help if anyone has any more info.

There are usually two sets of connectors near the ECU. One set is black and the other set is green. The green are the ones you connect together to go into the diagnostic mode.

I found different information -- including in several places the warning NOT to connect the green connectors first, because this erases all the stored code information you want to find out.

 

The original of what I'm posting below:

use a Usenet newsreader (if nothing better, use "Google Groups") and search for the newsgroup (I think Google calls it a community or something but it's a newsgroup)

 

alt.autos.subaru

search for:

"Curtiss Priest" +"Technical Note" +Subaru

 

This is quoted from his note on ECU code reading:

QUOTE:

The following description refers to a 1988 DL.

+++

the 1988 SPFI version did have

the wires to clear codes and display codes inside

the hood (next to the diagnostic connector block).

 

1. The Green single contact plugs -- this, when

connected with the ignition key in the On

position, does clear all codes and extinguishes

the "Check Engine" light

 

2. The White single contact plug -- this, when

connected, causes the ECU to emit "memorized"

codes of faults

 

Further. If there is no current fault, the ECU displays

5 short flashes, a pause, and 5 short flashes, etc.

(with neither white nor green connected)

 

When the white block is connected, the ECU then finishes

its stream of 5 short flashes and changes over to

displaying one or more fault codes...

 

END QUOTE -- see original for full info