1992 2.5 turbo map sensor wiring diagram?

[ShadowManSRT6]

Quote:

Originally Posted by NAJ You need to check the 2 power feeds into the relay at the relay. Did I send you powertrain wiring?

just the map sensor wiring colors. I do appreciate all your help so far!

[NAJ]

FYI just incase...
The ASD relay powers the fuel pump, + coil, injectors and HO2S heater circuit.
If a seperete fuel pump relay is used it powers the fuel pump relay.
On some vehicles it also powers the field circuit of the alternator.

The ASD relay has 2 power sources, a ground(computer controlled and an output to the powered devices.

With initial key on the ASD is actuated for 1 second to pressurize the fuel rail.
After that the ASD will not be actuated until the controller see's a crank signal, on the 3.0L that would be from the optical distributor.

1)Probe the output terminal(DG/OR) of the ASD with a 12 volt test lamp connected to - battery.
2)Turn the key on, the test lamp should illuminate for 1 second and go off.
3)If it does the ASD circuit is working fine, verify 1 second of power at the + coil and fuel pump.
4)If it does not illuminate check and verify both power sources are present at the ASD relay.
RD/WT...Constant battery voltage from WT fusible link
DB...Switched ignition from ignition switch

[NAJ]

I answered your PM.
Follow the steps in Post 17 and post back with your results and we will go from there.

I also just noticed that your profile says 92 Shadow V-6 and the thread says 92 2.5L Turbo, the ASD circuit will be the same, distributor and crank reference signal will not be the same.

[ShadowManSRT6]

ok. I did what you said
got power at the R/W lead
probed DG/OR and turned key. nothing.
DB wire has power with key on
the Final lead.... blue and yellow..... with key on... when I probed it with the test light it turned the fuel pump on.

now what?

[ShadowManSRT6]

it's funny how all this started after a head gasket replacement
before that I never had an issue at all.
and the original gasket didn't fail... I just did an. upgrade to a MP gasket and bolts. :-/

[NAJ]

If you have power on your 2 power sources RD/WT and DB wires but nothing on the output wire(DG/OR) with initial key on that means one of 2 things.
1)The DB/YL ground control wire is open between the ASD and controller or the controller is faulty.
2)The ASD relay is faulty

[NAJ]

AH HA!!!
Just had a revelation while eating my Honey Smacks.

1)Problem started after head removal.
2)You probed the DB/YL ground wire with a test lamp connected to ground and the ASD was actuated.

VERIFY YOU CONNECTED THE MAIN GROUND FROM THE MANIFOLD TO THE FIREWALL ON THE RIGHT REAR(PASSENGER)SIDE OF ENGINE.
IF NOT CONNECT IT AND...

Your car will start "assuming" all other components are correct.

IN THIS PIC YOU CAN SEE THE GROUND WIRE JUST TO THE RIGHT OF THE MULTIMTER.

[ShadowManSRT6]

amazing what honey smacks can do. lol
it makes sense. I will double check that first
if that's not it how do I diagnose the controller to eliminate that possibility?

[ShadowManSRT6]

ok. car did start... very hard tho. ran rough for a little and then when I gave it some gas and left off it shut off and couldn't start it again
maybe it wasn't the ground issue like the honey smacks gods
said. lol