OK I know I've posted this on here already, but I'm really at a loss here and I don't wanna get raped at the dealer. I can't pass emissions because my CEL is on. I first checked the codes got KS, EGR valve Solenoid. Replaced KS and EGR Solenoid and still got CEL with EGR Solenoid code and a new one popped up A/T Control Unit on my 5spd. I checked the codes again today, roughly one week after replacements and got Speed Sensor, EGR Solenoid, and A/T Control Unit. Reset and started again, got just EGR Solenoid code. Restarted again and ran for a while and got EGR Solenoid and A/T Control Unit. The solenoid has power at the harness and I can feel slight vacuum going in at idle speed.

If anyone has any ideas please help because this is my last attempt before signing my life away to the dealer.

P.S. I have a JWT ECU

 

What year do you have?

 

its a 96 and I don't really have any driveability problems so it leads me to believe it is electrical

 

check some of the fuses. If some fuses are burnt out it may cause other malfunctions in the system.

 

Are there any other fuses besides the two boxes in the engine bay and the box below the steering wheel?

 

anyone have any ideas????

 

so you're just failing because of the cel right???
can't you just reset it before you go to inspection... it's probably gonna light up again but not right away....
just a suggestion...

 

I have thought about that and considered trying it, but I'm doubting it would work. I would like to know what fuse the solenoid and A/T Control Unit are on but in the wiring diagram in the haynes book it just says that its connected to a fuse, it doesnt say where. Anyone with a FSM have more information?

 

Hi Tort,
This might be a side question:
I am thinking about getting a code reader (preferably a PC based), which one are you using and do you have any suggestion on which one should I get - what find of features should I look for.

I have my CEL on, I reset it and took it for inspection- well, the inspection place told me to go away and drive the car a little more till all the flags are set i.e do a drive cycle so the ECU can check and set flags on all the inputs, well by the time I did the drive cycle the CEL was back on
mine is 0201 and 0304.
-99 GXE

 

Interesting. You are the third person I know of (myself and Iansw are the others) that have the JWT ecu that gives out an EGRCV solenoid code.

I am convinced that the code is spurious and due to a programming bug. The reason I think so is because I don't get the code if I swap the JWT ecu out for a spare unmodified ecu I have (which is what I used to pass inspection recently). But when I put the JWT ecu back in and immediately check for codes, I get the EGR code (1005). A real problem with the EGR system would require the engine to be running before it detects a problem, unless there is a problem in the harness. But a wiring problem should show up on the unmodified ecu as well.

I replaced the EGR solenoid, and it changed nothing. Furthermore, there are no symptoms of EGR malfunction that show up when I'm driving. So I think it is a programming bug.

You might try obtaining an unmodified ecu for your year and see if you get the same error code. If you don't get a code, then you can use it to pass inspection.

The fact that you get an AT related code really bothers me, though. I'm not sure what to think about that, except that maybe JWT sent a modified auto ecu back to you instead of the one you sent them.

 

You don't need a code reader. Just use this: ECU codes

0201 is ignition signal circuit and 0304 is the ubiquitous knock sensor code.

 

Make sure you check all your vacuum sources. You should have more than just a "little" vacuum at idle.

I had to pull off my air cleaner box to discover a broken vacuum hose attatched the the throttle body. My codes were different (mine was the MAP solenoid valve), but it worked for me.

Good Luck

Mike

 

Stephen Max:
Where did you find a spare ECU and how much did it cost you? I'm guessing a junkyard maybe but I doubt that these are in high supply.

Crashmanmike:
I took my intake assembly off recently and didn't immediately see anything wrong with the hoses, I am planning on checking more thoroughly this weekend. Do you know how much vacuum should be coming to/from the solenoid at idle? I didn't measure with a pump, I just felt it with my hand.

 

I found my first 5 speed ecu (I converted from AT) using car-parts.com, it matched the production date of my car exactly, and that is the one I sent to JWT. I paid $120 for it, I think. I bought another one off ebay for $100 to use as a spare.

 

something else to consider, I used to get check engine light before I put in my JWT ECU. I'm not sure if EGR Solenoid was one of the codes I was getting I will have to check on that. I know for sure that I have never gotten A/T Control Unit before the JWT ECU, but I also pulled the codes when I first failed emissions and A/T Control Unit was not listed and I had not checked the codes for a while before that.