Error Codes: What They Mean

[Erni902]

Right after EvoScan was failing to show any error codes at all I resorted to the old school flashy dash way of reading.

The reason for reading the codes is that the TCL OFF and the CEL have been on permanently since Area 52.

The CEL code read as:

25 atmospheric pressure sensor systematic 13A- 17

This one I know is just an open circuit as it was soldered directly to the old ecu!! Obviously the new pin that Jason put in the connector for the new ecu is not quite making a connection.

The TCL OFF codes read as:

75 Engine ECU system 13H- 9
76 Channel of engine ECU

I have absolutely zero clue as to what these 2 mean!! Does anyone have a clue?

I also read the AYC code as:

31 Steer Sensor (ST-1, ST-2, ST-N) System (break)

However the red AYC light is never on when driving. Its comes on as part of the P.O.S.T but then goes off and causes no dramas at all. Should I just ignore this one?

Any help much appreciated especially whereas the TCL codes are concerned.

[Davezj]

have you cleared the code recently, by disconnecting the battery?
could they be old codes.

if they are new codes then it points to the solenoid valves on the left hand side of the grey TCL canister on the bulkhead.
also check all the vac hoses in that area, even a very little split can cause issues.
maybe just swap the solenoid valves from the purple one, possibly the grey canister as well.

[Erni902]

have you cleared the code recently, by disconnecting the battery?
could they be old codes.

if they are new codes then it points to the solenoid valves on the left hand side of the grey TCL canister on the bulkhead.
also check all the vac hoses in that area, even a very little split can cause issues.
maybe just swap the solenoid valves from the purple one, possibly the grey canister as well.

Well thats the confusing part Dave.

This is the 7202 ecu that was on the purple one. It did have a faulty grey canister that was logged under 71 or 72 etc. Basically it was cracked and so too was the canister on the silver one. (noticed when swapping over) so I got 2 brand new replacements. The 7202 on the purple one was reset and car running fine with no codes/lights.

The Silver VR-4 ran for several weeks with no issues at all until Area 52. The first time the errors cropped up were when the 7202 from the purple one was installed on the silver one. Prior to the swap the 7202 had been disconnected for around 2 weeks.

May have to experiment by putting the 7201 ecu back on and see what difference that makes.

Grey canister is brand new.
Hoses were checked at Area 52 after the epic boost leak test.

[Davezj]

very odd, but because the intercooler leak was so big any small leaks on the grey canister area would not have been picked up.

[swinks]

75 and 76 codes suggest that there is no communication between ecu and tcl-ecu. Have you got TCL fitted into your Legnum? If so your tcl-ecu can't communicate with ecu. Possible wrong rom image (dodgy flash) or mess with ecu harness/plug

[Davezj]

75 and 76 codes suggest that there is no communication between ecu and tcl-ecu. Have you got TCL fitted into your Legnum? If so your tcl-ecu can't communicate with ecu. Possible wrong rom image (dodgy flash) or mess with ecu harness/plug

thomasz you correct there. sorry my mistake i miss read the the error codes.

[swinks]

AYC code 31 means there is no communication between: steering angle sensor (steering column) and ayc-ecu, tcl-ecu and ecu.

Anyway, all codes suggest that you have some issues with harness.

[Davezj]

did you disconnect the battery when you removed the engine ecu. if not then maybe a simple battery disconnect will sync everything back up.

[Erni902]

@swinks @Davezj

Cheers for the replies guys.

Defo have TCL in the silver one.

The battery was disconnected the whole time during the ecu swap but there was an issue with the barometric pressure sensor wire (hence code 25) so its possible that when Jason reconnected this something else went t!ts. Not passing the blame there btw. At least I know im looking at the harness side of things.

Are there separate harnesses that connect to the ecu's or is it all connected through one massive loom?? I.E can i just replace the ecu harnesses or is it going to be a mahoosive job??

[swinks]

From ecu side there is one big harness, but splits into several junction blocks etc.
There is wiring electrical pdf somewhere in club members area. Excellent tool in searching for electrical issues.

[Erni902]

Cheers Tomasz I will have a dig around. If only it had the patch harness and that was butchered instead then I could at least remove it and plug in the stock loom directly.

[Davezj]

it may just be one of the connectors that was disconnected has not bee pushed back in fully. i did this with one of the engine ecu connectors once and it threw up a few error codes which were different to yours but they were ecu to ecu connection errors, e.g no connection between Autobox ecu and engine, abs and engine, etc, etc.
the connector was pushed in but it had not got the final click all the way home. it is worth a check.

[Erni902]

Yeah I will do a full Layer 1 check first then take it from there. I do however think that a harness patch could be my next purchase. That way I can easily cure the barometric pressure fault code too.

[Davezj]

when i make adjustments to the ecu wiring loom i do it with faston and blade connectors so that if i want to undo the change i can just disconnect what i added ad push the original wire back together. but when i deffinitely know i want to make the change perminent, i will solder and heat shrink the joint.

[Davezj]

here is the wiring doc, click the here link in this post

http://www.clubvr4.com/forum/showthr...l=1#post744608

unfortunately it is the uk spec wiring doc but it is the best we have, i have never seem a VR4 doc.

[Erni902]

Haha just spent over 1hr searching the docs etc and I just stumbled across the exact same thread! Cheers Dave

[Davezj]

for future reference just search for davcom1 that is the user name of the guy that originally hosted the link to the PDF. but when he moved on like almost every other externally hosted docs pictures, manuals, the really useful stuff, the hosting of the great bits of infomation disappears as well.
that is why i downloaded the PDF and tryied to upload it to the club website. but it was to big, so i think it is nev that is hosting it for use at the moment.
the PDF is 95mb so it is to big to upload using the upload manager built into the website.

[swinks]

Yes, that's one. Got myself that pdf too. I knew it wouldn't take long that hosting link will break
Dave it does apply also to Legnums if you know how to use one.

Rikki check out section with harness layout for RHD vehicles.