PPPP error, thoughts?

[Espen]

Hi.

First i wanna say that I have searched this subject, but with no luck. I know you guys are thinking "Oh no... Not that again..."

I recently retrofitted a OBC to my 1991 525i.
I only had 3 wires to the connector, so i bought a wiring harness from a identical car with a OBC.

I fitted the harness and tested the OBC, ---nothing, completly dead.

I jumped pin 9 and pin 17 and it started up , now i get the well known PPPP Error, this should not happen, because I have the check control instrument cluster.
My OBC is without CodeStick.

Any thoughts? I guess I could buy a Code Stick from the dealer and wire it to the OBC, but since i got the Check Control i shouldnt need that.

[Espen]

no one?

[Javier]

to cluster, or have a missing power input in the OBC. E-mailed you some interconnection drawings for the OBC on e34 1991 so you can use as a guide to check you have all the connections and power feeds there.

Javier

[Espen]

Thanks

Ive looked through those drawings, (cant say i understand them that good)

I also have the "easy" version of the pin-out:

pin1: violet/green/yellow, alarm system
pin10: black/green, starter
pin6: + from fuse F17
pin9: + from fuse F20 (red/yellow)
pin8: + from fuse F1
pin22: grey/red, light switch
pin25: yellow/red, turn signal switch
pin3: white/yellow, diagnostics
pin16: white/violet, diagnostics
pin14: white/grey, instrument cluster
pin7: black/white, instrument cluster
pin4: ground
pin5: blue/red/yellow, temp sensor
pin20: black/red/yellow, pre-ventilation
pin21: black/white, pre-ventilation
pin23: violet/white/yellow, alarm system
pin17: red/grey/yellow, alarm system
pin26: black/red/yellow, fuel tank level sensor
pin12: brown/violet, fuel tank level sensor
pin11: white/black, DME
pin24: black/violet, DME
pin19: white/red, chimes
pin18: white/blue, chimes
pin15: white/brown, radio
pin2: blue/brown/yellow, radio

I am thinking of following pin 11 and 24 to see if they are going to the DME/ECU, and i thought it would be wise to also check the pin 14 and 7 who should be connected to the instrument cluster..

I assume that the connection to the DME is not there, because i fitted a complete harness, and the new harness had an extra big connector on the left side under the steering wheel, my car didnt have this connector, so its "unplugged"

If was to wire the pin 11 and 24 my self, where should i wire it?
According to the PDF (dated 1991) from javier it should go to pin 38.
According to the drawing (dated 1994) at e34de it should go to pin 45 at a "DDE control unit"

the drawings:

[Espen]

After several hours of research I have found out that DDE is for Digital Diesel Electronics.


That brings up the question, where do I wire pin 11 and 24, according to the drawing at e34.de (the picture at the bottom of my last post in this thread)

Or should i just stick to the drawing i got from Javier?

In that case, it also gives me a question, is pin 24 going to pin 81 or 38?(look at the drawing) and should pin 11 go to pin 17 or 32?

[Espen]

Hmm..
After some work with my multimeter I`ve measured the wires going to the "extra" connector wich have no "connection".
Ive called it "XX" in this picture..



As you see its only pin 24 and pin2 that is unconnected of the "important" ones

[TWISM]

checked this link??

http://www.e34.de/tips_tricks/bc/bc4.pdf

EDIT:

And an other one!!

http://home.iae.nl/users/bts/obc.htm

[Espen]

Hi.

Yeah ive checked it some times, its the same pdf that is at gunnar525.de

[Espen]

EDIT:

And an other one!!

http://home.iae.nl/users/bts/obc.htm

I have`nt seen that one... But there were no drawings of the wiring there.
You wired all yourself right? Do you remember where you wired pin 24?

[Javier]

for DME 1.3 on 535i, 24 goes to Pin 38, for DME 3.1 on 525i, it goes to pin 81. It is the anti-theft signal generated from OBC. When you set an OBC code, it will block operation of DME until the code is re-entered.

There are important pending connections, if I understood properly your table.

Pin 6 needs power, it gets it from F17 circuit. Pin 8 need power from F1, pin 4 needs to be connected to ground, pin 5 should go to a temperature sensor in the front bumper, if you leave it open, you will have a nasty low temp alarm reading in the OBC. And finally, pin 2 going to cluster is part of the Data Link, so no communication with cluster if missing.

Javier

Edit: Pin 11 on OBC is the fuel rate signal from DME, not responsible for PPPP either, and has nothing to do with pins 3, 4, 6, and 9.