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> ECU Diagnostics (DIY), A Guide to Connector Locations, Hardware and Software Requirements
Muskie
post 28th August 2018 10:07
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Hi all,
Just reading through this excellent thread and wondered if there was anything else I would need to be aware of in 2018? Does the advice here hold for newer latops running Windows 10? Are there other options available now in terms of reading and resetting codes? Thought I would check before I get lost in a world of frustration with cables and software.
Thanks in advance for any advice.
Cheers,
Muskie
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Ganz
post 28th August 2018 21:50
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QUOTE(Muskie @ 28th August 2018 11:07) *
Hi all,
Just reading through this excellent thread and wondered if there was anything else I would need to be aware of in 2018? Does the advice here hold for newer latops running Windows 10? Are there other options available now in terms of reading and resetting codes? Thought I would check before I get lost in a world of frustration with cables and software.
Thanks in advance for any advice.
Cheers,
Muskie


I have just stayed with Windows XP in my laptop just so I can use FIATMuultiscan. I didn't want the hassle of finding out it didn't work in Win10. I have 3 OS on my laptop so I can use Linux on a day to day basis and WinXP when I need to scan for codes and erros on FiatMultiscan.


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JeremyG
post 31st August 2018 10:14
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MultiECUScan works fine for me under Windows 10.
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Muskie
post 2nd September 2018 10:03
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Thanks both. I'll give it a go on Windows 10
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se145
post 16th January 2019 16:18
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Wow - been a while since i have been on here! Still got the 145 after years of storage, now trying to get it back on the road, need some help if possible please:

Have the dreaded airbag light rant.gif - on a TRW2 ECU. Have connected via MES, cleared all faults except this one:

05 - Passenger squib circuit

The indicated airbag circuit(s) have an open, short to battery + or ground, or a weak connection (open circuit). The fault may also be in the ECU or in the sqib circuit(s). Inspect wiring and connections for opens, shorts and weak connections


I only have the driver steering wheel airbag tho? no passenger or side airbags

FYI Steering wheel was swapped out 2 years ago, and airbag light came on (so delayed me again until now)
Possible bad connections in steering wheel airbag unit? but why would it say passenger?

Thanks Stu
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JeremyG
post 16th January 2019 16:36
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That's odd - has your airbag ECU been changed (or your seats, for that matter)?

Just a thought - if you have an airbag ECU that expects seats with side airbags but your seats don't have the airbags... you'd need a resistor to replace the missing airbags. If these had been fitted but one had gone AWOL then perhaps that would explain your symptoms?

Also - be aware that "passenger side" may refer to LHD cars - ie, the driver's side in RHD cars. I know this has been an issue for GTV/Spider users running MES diagnostics on their airbag systems.

BTW - this question probably warrants its own new thread?

This post has been edited by JeremyG: 16th January 2019 16:37
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se145
post 17th January 2019 15:14
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QUOTE(JeremyG @ 16th January 2019 16:36) *
That's odd - has your airbag ECU been changed (or your seats, for that matter)?

Just a thought - if you have an airbag ECU that expects seats with side airbags but your seats don't have the airbags... you'd need a resistor to replace the missing airbags. If these had been fitted but one had gone AWOL then perhaps that would explain your symptoms?

Also - be aware that "passenger side" may refer to LHD cars - ie, the driver's side in RHD cars. I know this has been an issue for GTV/Spider users running MES diagnostics on their airbag systems.

BTW - this question probably warrants its own new thread?


Thanks Jeremy - great work on your car btw. Happy for admin to make this a new topic.

ECU is original. Did swap out seats about 10 years ago. But airbag light only faulted when the steering wheel was changed 2 years ago. Looking at the workshop manual airbag wiring - it does highlight a passenger airbag. Do cars with only a drivers airbag in steering wheel still have this passenger airbag wiring, but terminated with a fitted resistor?

Ref LHD/RHD I did think that. Last night I took off steering wheel airbag, took apart and inspected the connection plug, put all back together. I will check with MES tonight if that has made a difference. The cable was 'crushed' and bit, hoping this is not damaged causing the open circuit issue (see pictures - took yellow sheath off. Is there a solution if so?

Thanks.
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JeremyG
post 17th January 2019 18:42
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QUOTE(se145 @ 17th January 2019 15:14) *
Last night I took off steering wheel airbag, took apart and inspected the connection plug, put all back together. I will check with MES tonight if that has made a difference. The cable was 'crushed' and bit, hoping this is not damaged causing the open circuit issue (see pictures - took yellow sheath off. Is there a solution if so?


I notice from the first pic that the back of the plug for the airbag connector has come off. Has it always been that way? Is it possible that the exposed terminals could be shorting when reassembled? Iíd cover that with tape when you refit it.

(And Iím not sure why this would give you a passenger airbag error, but you never know...)

Itís worth also checking the wiring diagrams in the Workshop Manuals section to see if they contain any clues.

This post has been edited by JeremyG: 17th January 2019 18:44
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shpuncik
post 18th January 2019 14:16
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if airbag ECU hasn't been swaped and there is only one bag for driver then must be MES mistake between DR/PASS side.

fault could be triggered by faulty connection somewhere or broken clock spring ring behind steering wheel. you could use 2.2 ohm resistor instead of airbag to test system
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se145
post 19th January 2019 14:39
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Thanks for replies.

I tried again last night after re-seating airbag connector on steering wheel (btw yes the plug picture was taken with the cover missing when I was inspecting it, but I put in back together before putting steering wheel back) - the error cleared on MES, but reappeared 20-30 secs later?

This morning I re-plugged the connector to the ECU - same result, the error cleared on MES, but reappeared 20-30 secs later.

I looked at the attached wiring diagram, I definitely do not have passenger airbag wiring (removed trim and traced wiring) - so must be a PASS/DRV MES error as you say.

Couple of Qs:
1. if I disconnected the PPL-WHT wire to the instrument cluster - would this work?
2. do i need 2.2ohm or 3.3ohm dummy resistor for airbag connector test? why do this? to test airbag ok?
3. my horn still work no problem - so likely to be clock spring? like i said the airbag connector wire was crushed?
4. if i can reset other errors, likely to be ECU?

Thanks


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shpuncik
post 20th January 2019 12:45
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QUOTE(se145 @ 19th January 2019 16:39) *
...
Couple of Qs:
1. if I disconnected the PPL-WHT wire to the instrument cluster - would this work?
2. do i need 2.2ohm or 3.3ohm dummy resistor for airbag connector test? why do this? to test airbag ok?
3. my horn still work no problem - so likely to be clock spring? like i said the airbag connector wire was crushed?
4. if i can reset other errors, likely to be ECU?


Have you tried to see what errors you get with driver's airbag disconnected? Is it the same as above?

1. No, it won't. Default state of airbag warning light is always ON with ignition ON, airbag ECU turns it OFF in case of no faults. So by disconnecting PPL-WHT wire light will stay ON and airbag ECU will have another error like "warning light in instrument cluster is open/short bla bla bla" or something similar. Same is with disconnected ECU - light stays ON.

2. Usually system expects around 2.2ohm resistance, you could use even 3.3ohm but some cars detect it as too high and trigger error so 2.2ohm is best bet. But you could safely try with 3.3ohm and see if ECU is fine with that.
Yes, resistors help identify whether it's wiring or connectors are faulty. You could disconnecto connector under steering wheel trim which goes into clock spring, put resistor there to see if error goes off, or instead of driver airbag.

3. If horn works it doesn't mean ribbon cable isn't damaged. To be sure use multimeter and test pin-by-pin from both sides

4. Doesn't look like faulty ECU. When they are faulty they throw you error code "01" with description like "eeprom or ECU faulty". Still got couple of them on the table waiting to be repaired.

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se145
post 21st January 2019 10:08
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QUOTE(shpuncik @ 20th January 2019 12:45) *
Have you tried to see what errors you get with driver's airbag disconnected? Is it the same as above?

1. No, it won't. Default state of airbag warning light is always ON with ignition ON, airbag ECU turns it OFF in case of no faults. So by disconnecting PPL-WHT wire light will stay ON and airbag ECU will have another error like "warning light in instrument cluster is open/short bla bla bla" or something similar. Same is with disconnected ECU - light stays ON.

2. Usually system expects around 2.2ohm resistance, you could use even 3.3ohm but some cars detect it as too high and trigger error so 2.2ohm is best bet. But you could safely try with 3.3ohm and see if ECU is fine with that.
Yes, resistors help identify whether it's wiring or connectors are faulty. You could disconnecto connector under steering wheel trim which goes into clock spring, put resistor there to see if error goes off, or instead of driver airbag.

3. If horn works it doesn't mean ribbon cable isn't damaged. To be sure use multimeter and test pin-by-pin from both sides

4. Doesn't look like faulty ECU. When they are faulty they throw you error code "01" with description like "eeprom or ECU faulty". Still got couple of them on the table waiting to be repaired.


Thanks shpuncik. So the plot thickens. I tried MES to see what error I got when the airbag was disconnected, and now get additional error "04 - Driver squib circuit" (see below image) - which you would expect - but this then rules out the DRV/PASS mixup on MES/ECU?, and suggests my "05 - Passenger squib circuit" error is indeed for the passenger side (even though I do not have one, and looks like wiring is not present for it?). This also suggests clock spring is ok. I have a 2.2ohm resistor on the way, but looks like this will not help.

I had a relook for wiring, in case I do have the passenger airbag circuit, because the attached wiring diagram indicates cars should have it? With reference to the wiring diagram I could only see the wiring for the 3 pin plug, and connector G380 with PPL-WHT and ORN-LTB to the instrument cluster and fusebox - which looks wrapped in black after connector G380.

I did spot a yellow sheathed cable under steering column going back to the towards the fusebox. Thinking this is continuation of above, where the wrapped black cable gets a yellow sheath - but if not could it be the passenger airbag circuit terminated with resistor at fusebox? Long shot I know, but attach a photo of my fuses - all look as they should - or something extra in there?

Really scratching my head on this, really appreciate your help.



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ChrisS
post 21st January 2019 12:08
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QUOTE(se145 @ 21st January 2019 10:08) *
Thanks shpuncik. So the plot thickens. I tried MES to see what error I got when the airbag was disconnected, and now get additional error "04 - Driver squib circuit" (see below image) - which you would expect - but this then rules out the DRV/PASS mixup on MES/ECU?, and suggests my "05 - Passenger squib circuit" error is indeed for the passenger side (even though I do not have one, and looks like wiring is not present for it?). This also suggests clock spring is ok. I have a 2.2ohm resistor on the way, but looks like this will not help.

I had a relook for wiring, in case I do have the passenger airbag circuit, because the attached wiring diagram indicates cars should have it? With reference to the wiring diagram I could only see the wiring for the 3 pin plug, and connector G380 with PPL-WHT and ORN-LTB to the instrument cluster and fusebox - which looks wrapped in black after connector G380.

I did spot a yellow sheathed cable under steering column going back to the towards the fusebox. Thinking this is continuation of above, where the wrapped black cable gets a yellow sheath - but if not could it be the passenger airbag circuit terminated with resistor at fusebox? Long shot I know, but attach a photo of my fuses - all look as they should - or something extra in there?

Really scratching my head on this, really appreciate your help.

Not much help, but I had a very similar problem with my blue 1.8 last year, after much head scratching the only thing left was a fault/broken wire somewhere in the underseat wiring on the passenger side. Given the MOT failure with loads of corrosion due to 'protection' applied by a 'specialist' I'm afraid I moved the car on so never found the source.
ChrisS


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se145
post 21st January 2019 12:12
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QUOTE(ChrisS @ 21st January 2019 12:08) *
Not much help, but I had a very similar problem with my blue 1.8 last year, after much head scratching the only thing left was a fault/broken wire somewhere in the underseat wiring on the passenger side. Given the MOT failure with loads of corrosion due to 'protection' applied by a 'specialist' I'm afraid I moved the car on so never found the source.
ChrisS


Hi Chris - did you only have a drivers airbag too? - did you have wiring for a passenger airbag present? Thanks
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JeremyG
post 21st January 2019 17:00
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What does the wiring connector on the airbag ECU tell you (it's at the bottom of the centre console, below the radio, if you haven't found it yet).

If you can see wires on pins 3 & 4 then (from the wiring diagram above) that would tell you there's a passenger airbag...

Also, what year/model is your car?

This post has been edited by JeremyG: 21st January 2019 17:08
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shpuncik
post 21st January 2019 21:27
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in this case most likely you have airbag ECU for DR/PASS. check connector at the ECU for PASS side wiring as JeremyG sugested. if it's missing I'd just connect resistor to PASS airbag terminals and that will do the trick
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se145
post 22nd January 2019 09:08
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OK - so I disconnected my ECU connector and cut yellow sheath to see what wires it was hiding (see photos). My car btw is a 1.8TS 1997 (R plate).

I do indeed have 8 wires (not including earth). The colors seems to match the wiring diagram - two yellow cables must be for PASS airbag. As I do not physically have a passenger airbag, they must go to a point where they are terminated with a resistor? The two yellow cable then go together to a black sheath - this is what I need to find/trace to where it goes - any ideas?

This post has been edited by se145: 22nd January 2019 09:44
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