Code Reader Problems

[BMG]

I have a 93 E320 Wagon and have never been able to pull codes off it.

The push button on the reader in the car is non functional. I noticed that all the wires under it have had a minor amount of insulation cut away as if the PO's were troubleshooting this at one time.

I cannot find any wiring diagrams of this unit and am looking for any suggestions on how to start.

I have already built a reader (A Dalton design) and cannot get that to function as well.

[Arthur Dalton]

Test #1`

Do you have 12 v at diagnostic connector socket #16 [ test from #16 to battery neg w/key ON

If NO, change fuse #9..................

[BMG]

Test 1 Result

Voltage measured at Connector 16 w/ key on. I will need to recheck becuase the meter I used is a 0-50 span and it looked just under 10V. Once I dig out the better meter, I will report.

I retried the push button since I had not done so after putting dielectric grease on all the fuese after fixing my aux fans. Still no pulsing from the LED.

[Arthur Dalton]

Test the tool u built accoss the battery:

test 1- Red on + , yl on neg...led should light

test 2- Red on pos, blk on neg...led should light when the button is pressed.

[BMG]

Hand reader ok - Red to battery, yellow to ground - LED lit
Red to battery, black to ground, button pressed - led lit

I did have a blown fuse in the hand reader. D

[Arthur Dalton]

Cool..
You would be surprized at how many do not know the tool is polarity sensitive when they make it..which is why I have +/- indications on the plan........

What do you have at pins 8 and 14??

[BMG]

OK - the car's default reader is DOA - can't seem to get the LED to respond.

Got codes with the hand reader. Pulled and cleared - drove around, then pulled and cleared again. Here they are

First Run
Pin 6 - 2 and 8
Pin 8 - 4, 25,33,42,49
Pin 14 - 2,5,11 - 5 would NOT clear

Took car for ~30 min drive

Pin 6 - 8
Pin 8 - 4, 25, 28, 33, 42
Pin 14 - 5,11 5 still won't clear.

Ran pin 7 as well
Pin 7 - 1
pin 10 would not respond

[Arthur Dalton]

< >>

Go to pin 3 with tool...that will access DM /N59 module the same as Built-in PB

[BMG]

Arthur,

I found a reference document (for the CS1000 reader) on one of the threads discussion codes. I saw the note for pin 3 and did try to read it but I am getting a constant voltage on that pin. When I plug in the LED is automatically on. Sounds like the original LED wore out from a constant voltage.

Suggestions?

[Arthur Dalton]

Does your car have a CE and the PB ??

[BMG]

Ok - Ce and PB refer to...? Don't know the acronyms

[Arthur Dalton]

Sorry ..thought you did..

CE is Check Engine lamp

PB is built-in Push Button Led/Sw combo...at DM 16 pin box

Federal version did not have it..Cal versions did ..so, that is the why of the question..

[BMG]

Ahhh

Check engine light is NONfunctional. Turn on the key (w/o starting) and all warning lights but the CE light come on. I suspect some jury rigging by PO.

After I bought the car I found the ABS light light but it was removed from its socket in the instrament panel and tucked back in the dash.

As for the PB - Its there but nonfunctional. It was the reason I began this thread .

Should I get the VIN for a check of the vehicle version?

[Arthur Dalton]

<

Don't have to..as I said , if you have PB, you have Cal Manadate Emmisions system with N/59 module ..someone did not like looking at the CE lamp and did a nasty..
I will get the proper test procedures to you...........

[BMG]

Thanks Arthur,

I recall on the Carfax report the car originally came from CA and lived there for some time.

I also recall when doing the harness, there was some reference to a module on the drivers side wheel well which when I was doing the wiring appeared to be absent.