Volvo Community Forum. The Forums of the Volvo Owners Club

Forum Rules Volvo Owners Club About VOC Volvo Gallery Links Volvo History Volvo Press
Go Back   Volvo Owners Club Forum > "Technical Topics" > 200 Series General > 200 Series Articles

Notices

200 Series Articles How to's and Guides for the 200 series.

Information
  • VOC Members: There is no login facility using your VOC membership number or the details from page 3 of the club magazine. You need to register in the normal way
  • AOL Customers: Make sure you check the 'Remember me' check box otherwise the AOL system may log you out during the session. This is a known issue with AOL.
  • AOL, Yahoo and Plus.net users. Forum owners such as us are finding that AOL, Yahoo and Plus.net are blocking a lot of email generated from forums. This may mean your registration activation and other emails will not get to you, or they may appear in your spam mailbox

Thread Informations

A guide to reading fault codes on your 1990-1993 240

Views : 21296

Replies : 0

Users Viewing This Thread :  

 
 
Thread Tools Display Modes
Old Apr 18th, 2011, 11:29   #1
wooble
Stay gold baby!
 

Last Online: Jul 24th, 2022 16:15
Join Date: May 2009
Location: Bristol
Default A guide to reading fault codes on your 1990-1993 240

For those of us who have a late 240, specifically those made from 1990-1993 fitted with Bosch LH-Jetronic 2.4 fuel injection, I'm sure we've all seen and experienced the horrors of the lambda light. What this light actually means is that one of the engine computers has detected a fault somewhere in the engine management system and is alerting you to its presence BEFORE any damage is done as a result. This post will explain how to use the self-diagnostic function to read codes and diagnose problems indicated by the lambda light.

TERMINOLOGY:
ECU: the Engine Control Unit, which is a computer located on the right of the driver's side footwell. this computer controls fuel delivery to the engine.
EZK: a smaller ECU located on the passenger side firewall that controls spark timing for the engine.

Right, so you've go the dreaded lambda light illuminated on your dash. The car may seem to be running fine, it may be running rough. No matter, the light is telling you the ECU or EZK has detected a fault. What we're going to do is find out what the computers think is wrong. The first step is to open the bonnet:



The arrow points to the diagnostic box. If you take a closer look, it looks like this:



Pull the lid off the box, and you're presented with six sockets, a diagnostic probe, an LED and a button:



With the ignition turned off, insert the probe into socket 2 (to read codes from the fuel ECU) or socket 6 (to read codes from the EZK). Turn the ignition to key position 2 without starting the engine. Press down the button on the diagnostic box for about 2 seconds, and the LED on the box should flash out a three-digit code, i.e 3 flashes, space, 2 flashes, space, 1 flash would be code 3-2-1. After reading the code, depress the button again for 2 seconds to see if further codes are stored. If the same code repeats, there are no further fault codes stored.

It is also worth noting that not all fault codes cause the lambda light to illuminate. If you're having running difficulties, it's worth checking to see if there are any stored codes which could point you the right way.

Below is a list of all the fault codes that can be stored:

ECU:
1-1-1 - No faults
1-1-2 - ECU internal fault
1-1-3 - Lambda control - engine running too rich/lean
1-2-1 - Mass air flow meter signal faulty or missing
1-2-2 - Air temperature sensor signal faulty or missing
1-2-3 - Coolant temperature sensor signal missing or faulty
1-3-1 - RPM signal from EZK missing
1-3-2 - Battery voltage too low or high
1-3-3 - Throttle position sensor idle setting faulty
1-5-4 - Exhaust Gas Recirculation flow too high
2-1-2 - 02 (lambda) sensor signal missing or faulty
2-1-3 - Throttle position sensor full load setting faulty
2-2-1 - Lambda control - engine running too lean at part load
2-2-2 - Main relay faut
2-2-3 - Idle Air Control valve signal missing
2-3-1 - Lambda control - too lean or too rich at part load
2-3-2 - Lambda control - too lean or too rich at idle
2-3-3 - Idle air flow outside control range
3-1-1 - Speedometer signal to ECU missing
3-1-2 - Knock sensor signal (from EZK) missing
3-2-1 - Cold start injector signal missing or faulty
3-2-2 - Mass Air Flow sensor burn-off signal missing or faulty (MAF wiring fault)
3-4-4 - Exhaust Gas Recirculation temperature signal missing or faulty

EZK
1-1-1 - No faults
1-4-2 - EZK internal fault
1-4-3 - Knock sensor signal missing or faulty
1-4-4 - Load signal from ECU missing
2-1-4 - RPM sensor signal intermittently missing
2-2-4 - Coolant temperature sensor signal missing or faulty
2-3-4 - Throttle position sensor idle signal faulty

Once you've repaired the problem or to check if the problem is still present after repairs, you'll need to clear the codes from the ECU/EZK. This is accomplished by inserting the probe into the appropriate socket and read the codes as detailed above. Once the codes have read themselves out, press the button for more than 5 seconds. After 3 seconds, the LED should light. Press the button again for more than 5 seconds. the codes should now be erased. You can then repeat the procedure for reading codes and you should read '1-1-1' for 'no faults stored'.

I hope this post is useful and keeps everybody on the road! If anybody's got any additions or amendments to what I've written, don't hesitate to contact me or post them up.

Edit: Link to original thread.

Last edited by cumbrianmale; Apr 18th, 2011 at 23:04. Reason: Link to original thread
wooble is offline  
 


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT +1. The time now is 02:20.


Powered by vBulletin
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.