Error code 0034 (I think)?

Technical Area Engine, Transmission, Exhaust etc
2

Hi all,

I’ve recently picked up a MK1 that needed a little work for my son (he wanted a summer project).

We’ve managed to get it through a MOT. After a long run over the weekend, I checked to see if any error codes were present (before the MOT, it suggested a new oxygen sensor).

I think the code is 0034. Long pulse, pause, long pulse, pause, long pulse followed by 3 short, long pulse followed by 4 short.

So is this error code 0034? And if it is, any idea what this means? I’m struggling to find what it is.

Thanks in advance,

Tony.

 

 

 

3

I think the mk1 ecu codes are only two digits.
Just my guess as to what you are seeing.
First long flash is just to show the ecu is in diagnostic display mode.
Next long pulse error 10. Airflow meter thermistor
Long one and three short. 13 not listed so not sure
Long and four short 14, atmospheric pressure sensor. Could be error 34, idle air control valve.

Best to clear the ecu ( disconnected battery and foot on brake pedal) reconnect battery and go for a drive just to confirm error codes.

I’m sure those of more knowledge than I have will be along to advise hut those are my feelings.
Good luck.
D

4

The LED type tester I bought for my early Mk2 also covers the Mk1.
The fault code chart that came with it confirms that Mk1 codes are only two digits.
“34” for the Mk1 is stated to be “Idle air control”.

5

I read that you can also get 4 digit codes as well, but not sure if it was from a MK1 or other. The car is a Japanese import (1996), 1.8 engine.

Before the MOT, it was giving an error saying lambda sensor not changing. That’s been changed now, this new error code was not present before. I’m just a little puzzled.

 

6

This is worth a read

https://mx5diy.blogspot.com/2015/04/retrieving-engine-fault-codes-for-mx5.html?m=1

7

I had seen that page before (I think that’s what prompted me to search for how to build the diagnostic LED tool).

I’ll read the codes again in the morning and pay much more attention to the gaps between the pulses.

8

 

The four digit fault codes came along with the Mk2.

 

I wonder if you have an air leak? Is the new Lambda sensor fully tightened? Is it possible that something on the inlet side was disturbed while you were working on the car? 

 

The first long flash isn’t part of the code. With no faults it should still occur. Is what you are seeing that first long flash followed by “034”?

9

If the car is a late MK1 1997/8(1.8, not sure about 1.6)  it could well have the later style MK2 4 section error output.

0034 is idle air control. 

This relates to the air control on the throttle body rather than the idle air valve on the inlet manifold which does not produce an error code.

  

10

ok, I’ve taken a video of the code. For info, it’s a 1996 MK1.

https://youtu.be/VhMBs2qWlaE

I’m now thinking it’s two codes, a 10 followed by 34. But not 100% sure. Any advice is more than welcome.

11

What’s the 6th from last digit of your VIN? Is it a 4? Looks like P0034 to me but I’d like to see it repeat a couple of times. It could be 10, 13 & 14.

12

The VIN number ends in an 8.

If you go to 40s into the video, the code sequence repeats for a 2nd time.

13

6th from last digit. I’d go for the 4 digit P code then.

14

I just re-read your post, my error, the 6th from last is a 4.

I’ll get another video done tomorrow when i’ve got someone to hand to turn the key on so I can film it from the start.

15

That’s answered my question. It’s a P0034.

My understanding is Roadsters give 4 digit codes from VIN serial number 400001 onwards and MX-5s from 300001 onwards.

16

Is there a list somewhere that says what this code means? I’m struggling to find anything (all I can find on the web is ODB II codes for P0034 relating to a turbo (and this car definitely does not have a turbo)).

17

I posted earlier on this thread to tell you what a ‘0034’ more usually a 34 error code indicates. It is not an OBDII code as still relating to the old school diagnostics used on the MK1.

0034 is idle air control solenoid valve.

This relates to the air control on the throttle body, probably testable electrical failure.

This thread will help.  

.

 

 

18

Thanks for all your help.

I’ll test at some point over the weekend. It has been idling and running fine, hopefully it just needs a clean.

19

Have you cleared the code to see if it returns?

I’ve just done some checking (I was replying from the pub yesterday) and there is no code 0034. I’ve watched the video again and I’m going for a 0340 (10-13-14-10) code, camshaft position sensor.

20

Interpreting these is a headache but I see 0034 and a repeated 0034

long pulse(delimiter)

0

long pulse(delimiter)

0

long pulse(delimiter)

3(short pulses)

long pulse(delimiter)

4(short pulses)

long pulse(delimiter)

0

long pulse(delimiter)

0

long pulse(delimiter)

3(short pulses)

long pulse(delimiter)

4(short pulses)

…and now my head hurts.

I would remove the plug from the idle air control solenoid valve and check resistance as explained in the thread link above. I have done this and proved both working and non working parts. If it appears to be working, worth spraying with some servisol super 10 contact cleaner or similar.

The code is stored so something interfered with this part, wiring, connection or part itself.