Fault Finders.......

[heyiga]

Hi,

I have just been given one of the 'Gunson'? fault finders which I understand to be for my engine (2933 EFI) I have two questions:

1)Where is the connector for it normally situated, the guide book reckons near the battery, but no sign of it there? am presuming it is a small round plug with cap of some kind?

2)I have the 3 pin version, is this right, or do you need a five pin model?

Car has gone into safe (boring) mode, and am not sure why, as everything appears to be fine!

Thanks once again, oh fountain of knowledge!

[bugsy]

When my mechanic plugged in a hand held faultfinder, he found a plug dangling in the ECU compartment under the dash, passenger side.

[Kentish]

The diagnostic plug in my S is up behind the panel above the passenger footwell, where the ECU is.

Mine has velcro and a clip and will just pull down to expose the fore mentioned gubbins

[SotonS2]

As Bugsy says, I think its in the ECU pouch under the glovebox.

The correct tester is for the EEC-IV ECU. AFAIK its a 3 pin socket.

Some useful info here

www.fordscorpio.co.uk/star.htm

and here

http://dalidesign.com/hbook/eectest.html



>> Edited by SotonS2 on Tuesday 26th April 10:08

[tvrgit]

Agree with all of the above, 3-pin triangular plug, black shroud, red interior, under the glove box.

I can't get my Gunson tester to work though - not sure if it's the ecu, the connector or the tester itself (it's old and I bought it when I had a 2.9 Granada) - it was a brilliant bit of kit!

Am getting a separate test done on the car and the tester, to help the diagnosis!

[TOPTON]

I had a look at the links posted by sotons2, think i better go to college and learn some more swahili, I am sure thats what language it's in

[sotons2]

TOPTON said:

I had a look at the links posted by sotons2, think i better go to college and learn some more swahili, I am sure thats what language it's in

[heyiga]

Thanks Guys,

I will start exploring 'spaghetti junction' tommorow, to find it. Note to self... Get contortionist lessions before buying next TVR!

Advice appreciated as always.

Ian

[SotonS2]

The good news is that there is only a finite number of sensors which could trip the ECU into safe mode.

The main culprits seem to be the TP, Engine Coolant Sensor, Idle Speed Control valve and Air Flow Meter (the top one).

If the Gunson codes do not point you towards the offending sensor, it may be worth just checking through these one by one.

For instance, the top AFM gets gunked up quite easily and the sensor output goes to pot. To resolve, remove the air filter and have a look at the wire / plastic cowl arrangement behind the air flap (all will become clear once the filter is off). If the cowling is covered in oily crap, use some carb cleaner and a cotton bud (carefully). Also, try running carb cleaner through the meters until the stuff runs clean.

Idle speed control valve can be removed and flushed through with carb cleaner.

Coolant temp sensor can be checked on a multimeter with engine cold up to engine hot. Haven't got the correct readings to hand but could probably get them if needed.

Throttle pot....enough posts already on that subject

Long shots maybe, but worth a go..

[heyiga]

Hi Guys,

Thanks for the tips, I found the connector port for the tester, although it turned out that I needed the 5 pin version, (mine is a 1989 model, and must use an older ECU)So after a trip to Halfrauds, to swap the tester......

Trouble is, connected up for an engine off test, the light on the tester comes on when I turn the ignition on, but when I switch to tester to 'I' nothing happens? Any ideas what to try next?

Cheers
Ian

[tvrgit]

Interesting Heyiga...

My old Gunson tester worked on my old Granada but doesn't on the TVR. I thought it was the tester.

So yesterday I built one (for the grand sum of under 3 quid) and it has exactly the same fault.

www.tvrgit.com/tester2.jpg

I suspect that it's the car's wiring, somehow. I am going to ask a friend in the trade to connect up his (much more expensive!) diagnostic reader to see if that works - that should narrow down the problem.

[tvrgit]

and, by the way, I wasn't aware that Ford ever used a 5-pin socket on the EECIV management system - they were 3-pin OBD1 triangular plugs and then, later, 16-pin OBD2 sockets (although these were only fitted to the post-1995 Scorpio-shape IIRC)

I could be wrong though - but are you sure you are plugging into the right socket? Sorry if that's a stupid question!