Been testing all morning and still no idea what to do, no start thread; please help.
Rotary Freak
Joined: Jul 2008
Posts: 1,660
Likes: 2
From: FORT WORTH TEXAS
Disconnect all items using the ref voltage. Like the TPS, AFM, Boost sensor, OMP............and then backprove 2I (brown/white) at the ECU with the connectors on the ECU and see if the five volts is there now.
If not make sure the ECU is getting power with key ON. Pins 1A and 1B. If power is on those two pins but there is no ref voltage on 2I................get another ECU. But you need to wonder just what killed the ref voltage in the first place. Usually I'd suspect one of the items mentioned that uses ref voltage was put to gnd at some point in time and killed ol ref v.
If not make sure the ECU is getting power with key ON. Pins 1A and 1B. If power is on those two pins but there is no ref voltage on 2I................get another ECU. But you need to wonder just what killed the ref voltage in the first place. Usually I'd suspect one of the items mentioned that uses ref voltage was put to gnd at some point in time and killed ol ref v.
Thread Starter
Resident Rotard
Joined: May 2009
Posts: 908
Likes: 0
From: Belleville, Illinois
Disconnect all items using the ref voltage. Like the TPS, AFM, Boost sensor, OMP............and then backprove 2I (brown/white) at the ECU with the connectors on the ECU and see if the five volts is there now.
If not make sure the ECU is getting power with key ON. Pins 1A and 1B. If power is on those two pins but there is no ref voltage on 2I................get another ECU. But you need to wonder just what killed the ref voltage in the first place. Usually I'd suspect one of the items mentioned that uses ref voltage was put to gnd at some point in time and killed ol ref v.
If not make sure the ECU is getting power with key ON. Pins 1A and 1B. If power is on those two pins but there is no ref voltage on 2I................get another ECU. But you need to wonder just what killed the ref voltage in the first place. Usually I'd suspect one of the items mentioned that uses ref voltage was put to gnd at some point in time and killed ol ref v.
I sort of stalked a lot of your posts. lol.
My OMP was going out on the car and throwing codes.
I bought a good/used one and was waiting on it.
Didn't hear from the guy for a week after I paid.
Started playing with the wires..
I probably did destroy the ecu, but I like to learn from experimenting....
Sometimes it bites me in the @ss...
I'll find out saturday if it was just the ecu...
Rotary Freak
Joined: Jul 2008
Posts: 1,660
Likes: 2
From: FORT WORTH TEXAS
Actually you could pull the plugs off those items and it would be easier to just probe one of those elect plugs at the brown/white rather than probe the ECU plug.
Should show the same result. Matters not which of the plugs you check as long as the plugs are off all those items but the ECU plug is still attached to the ecu.
No 4.5 to 5vdc equals bad ECU. Even a showing of say 2vdc is failure.
Should show the same result. Matters not which of the plugs you check as long as the plugs are off all those items but the ECU plug is still attached to the ecu.
No 4.5 to 5vdc equals bad ECU. Even a showing of say 2vdc is failure.
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smikels
2nd Generation Specific (1986-1992)
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Aug 18, 2015 01:26 PM
