1G Clear CEL for EGR?

[SnowmanFD]

I got a cel on the way to school today and checked it via 12v led (see vid below) its coming back as egr (43) correct me if im wrong but this is just an emissions related code and seeing as i live in Washington and we dont have emissions im wanting to clear the code so i can read future codes.

 

[1990TSIAWDTALON]

If you are asking HOW to clear it, I believe just unhook the battery for a few minutes so the caps all drain out of the ecu and then hook it back up. I have ECMlink so I clear codes or see them there so I'm not 100% sure but that is the "old school" way for OBD1 cars.
Let us know what you do.

 

[steve]

California ECU?

 

[SnowmanFD]

California ECU?

I wouldn't doubt it. How could i check?

If you are asking HOW to clear it, I believe just unhook the battery for a few minutes so the caps all drain out of the ecu and then hook it back up. I have ECMlink so I clear codes or see them there so I'm not 100% sure but that is the "old school" way for OBD1 cars.
Let us know what you do.

Ill try this.
Anything i could to so it doesn't come back or just have to clear it every time till i get link?

 

[1990TSIAWDTALON]

Have to clear it everytime until its resolved.

 

[SnowmanFD]

Have to clear it everytime until its resolved.

Turn out i still have my egr. should i block it off then ignore the cel? Till i get link

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[steve]

I wouldn't doubt it. How could i check?

To be 100% sure you would have to open the ECU up and compare the board with the numbers on the ECU and both against the list of ECUs. This is because many of the ECUs have been swapped and otherwise molested over time and you can't be sure what's on the case matches what's inside or that it's the right ECU for your year car.

A 1990 Federal AWD should have a MD145903 ECU. The California AWD would have a MD145902 ECU.

Based on your other posting about the tach I'm expecting that you don't have a 1990 ECU in the car.

 

[SnowmanFD]

To be 100% sure you would have to open the ECU up and compare the board with the numbers on the ECU and both against the list of ECUs. This is because many of the ECUs have been swapped and otherwise molested over time and you can't be sure what's on the case matches what's inside or that it's the right ECU for your year car.

A 1990 Federal AWD should have a MD145903 ECU. The California AWD would have a MD145902 ECU.

Based on your other posting about the tach I'm expecting that you don't have a 1990 ECU in the car.

if I remember correctly the case or "shell" says It's a 91-94, one thing I'm sure of is that I have an EPROM

 

[steve]

Well? This relates to your latest question. What was the resolution?

 

[SnowmanFD]

Well? This relates to your latest question. What was the resolution?

Resolution for my egr?
Currently i still have it installed, and the cel is still on. Im planning on fixing the egr until i get ECUlink then doing a block off.

 

[pauleyman]

Resolution for my egr?
Currently i still have it installed, and the cel is still on. Im planning on fixing the egr until i get ECUlink then doing a block off.

If you're getting an egr code it is because of the sensor not the egr valve itself. As pointed out earlier if you have a CA ECU in a federal car you don't even have the sensor to plug in. It wont' matter if you blockoff the egr or not ecu still won't know it.

 

[SnowmanFD]

If you're getting an egr code it is because of the sensor not the egr valve itself. As pointed out earlier if you have a CA ECU in a federal car you don't even have the sensor to plug in. It wont' matter if you blockoff the egr or not ecu still won't know it.

Ohhhh i understand now.
Im thinking its a 6/93-5/94 because the case and the eprom match the numbers but im going to open it and compare the board so i can be 100%.

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[pauleyman]

If that part number is correct that's a federal 5 spd ecu

 

[steve]

The EPROM Version EB21 matches the MD304484 part number so it's a 94 Fed MTX AWD ECU. I can't remember anymore if the 94 cars got CA EGR's or not. There's a nagging thought that they did. (I know you 90 car doesn't, but this would explain the EGR fault from a Federal ECU otherwise we have to validate the fault was read correctly.

The capacitor are original and should be replaced ASAP. I don't see any signs of leakage or corrosion in what is shown.

Because this is a 91+ ECU in a 90 car you need to check if pins 6 and 14 have been swapped and understand that the cluster tach is going to have issues unless the ignition system gets modded.

 

[SnowmanFD]

The EPROM Version EB21 matches the MD304484 part number so it's a 94 Fed MTX AWD ECU. I know you 90 car doesn't, but this would explain the EGR fault from a Federal ECU otherwise we have to validate the fault was read correctly.

The capacitor are original and should be replaced ASAP. I don't see any signs of leakage or corrosion in what is shown.

Because this is a 91+ ECU in a 90 car you need to check if pins 6 and 14 have been swapped and understand that the cluster tach is going to have issues unless the ignition system gets modded.

Ok im still a bit confused so correct me if im wrong. The 94' has the California egr so if use a 94' ecu in any car that doesn't have a California egr it will throw a code?

Would it be smart to hunt down a 90 ecu?
Its sounding like that would make my life alot easier both with the egr and my tach issue

 

[steve]

Ok im still a bit confused so correct me if im wrong. The 94' has the California egr so if use a 94' ecu in any car that doesn't have a California egr it will throw a code?

That's if I remember correctly. I'm not 100% sure on how the 94MY cars were configured.

The test are in the software inside the EPROM chip so DSMLink of a different version of the software would fix the fault.

Would it be smart to hunt down a 90 ecu?
Its sounding like that would make my life alot easier both with the egr and my tach issue

If you can find a good 1990 EPROM ECU...