Multiple Fault Codes - Ecu Or Wiring?

[K9d 108]

My V6 lost its throttle after a battery change and had symptons similar to yours, I did a throttle reset and it was fine after.

 

I can't remember the procedure but I'm sure a quick google will tell you or Smaky will be along, if you don't already know how to do it.

[Morgan 46]

Here's a shameless cut and paste for the throttle reset procedure:

 

1. Disconnect battery for 45 mins

2. Reconnect battery, and turn ignition to MAR for 90 secs

3. Turn off and leave 90 secs

4. Start engine WITHOUT pressing throttle and let the car idle for 15 mins (I repeat, do not touch the throttle whilst the car is idling)

5. Turn engine off and leave for 10 minutes

6. Start the car and go for a drive, using a number of styles (eg town, motorway, thrash etc.)

 

[filipharvey 0]

It's not that which is the problem, it is the ECU not receiving or showing a signal from a number of sensors and throwing random fault codes.

Had the back of the ECU off last night and it all looks ok, but the wiring is so tiny it is hard to tell.

 

Thanks for the help chaps, but a simple throttle reset isn't going to fix this.

[Morgan 46]

Oh dear.

[filipharvey 0]

Indeed.

[filipharvey 0]

Just let the car warm up for a bit, and the following codes were shown:

 

P0100 Mass Air Flow (1) [signal Low] - Fatal

P0340 Camshaft position sensor [signal High] - Fatal

P0443 EVAP circuit (4) [signal Low]

P0135 Preheating resistance 1 above cat [signal Low] - Fatal

P0155 Preheating resistance 2 above cat [No Signal] - Fatal

P1135 Preheating resistance 1 above cat [invalid Signal] - Fatal

P1155 Preheating resistance 2 above cat [invalid Signal] - Fatal

P0141 Preheating resistance 1 below cat [No Signal] - Fatal

P0161 Preheating resistance 2 below cat [No Signal] - Fatal

P1141 Preheating resistance 1 below cat [invalid Signal] - Fatal

P1161 Lambda 2 signal below cat [invalid Signal] - Fatal

 

I don't recall seeing the cam sensor show before, and it didn't appear until after it had been disconnected and reconnected. I cleared the codes, ran the engine again and it reappeared.

 

Yet again the following codes refuse to clear, even when the engine is switched off:

 

P0443 - EVAP Circuit (4) - [signal Low] - Fatal

P0135 - Preheating resistance 1 above catalyst - [signal Low] - Fatal

P0155 - Preheating resistance 2 above catalyst - [signal Low] - Fatal

 

 

The MAF code (P0100 Mass Air Flow (1) [signal Low] - Fatal) used to only show once the engine had been revved, however it now shows as soon as the engine has been started.

 

During the warm up, the lambda heaters were switching constantly on and off, which obviously isn't right either.

Edited April 5, 2013 by filipharvey

[filipharvey 0]

Does anyone know which are the lambda fuses/relays on the CF3 V6?

[smiffy 99]

No sorry bud, been reading the thread gutted for you

[filipharvey 0]

To be honest I'd be happy if it was the ECU, at least that would be an easy fix with a new one and code box.

I don't know anyone nearby with a CF3 V6, otherwise I could try their ECU on mine.

It's a shitter cos all the work I put into doing the 3.0 conversion is rendered pretty pointless at the moment as it is so down on power - feels just like the 2.5 did.

[smiffy 99]

There are plenty of 3.0 breaking on eBay see if they will sell the ecu separately?

[filipharvey 0]

Think I can get a set from AL for about £160, so it's not too bad.

Just don't want to buy one to find out that wasn't the fault after all.

 

I do wonder if either the 3.0 GTV or 166 codebox will work on the 156? The ECU will as they are all ME3.1's but I would need the codebox and immobilser chip to match.

It would save me getting a remap on a 2.5 156 one.

Edited April 5, 2013 by filipharvey

[smiffy 99]

Shame the GTA is different I could of trundled down to help you out

[filipharvey 0]

If the pinouts are the same, it would be enough to test it.

The ME3.1 of the 2.5/3.0 and ME7.3.1 of the 3.2 are near identical ECUs.

I'll have to check.

Edited April 5, 2013 by filipharvey

[smiffy 99]

No worries dude let me know

[filipharvey 0]

Will do. I might have a word with Casson as he's probably closer than you - but he's fairly precious over his GTA so probably wouldn't allow it

[smiffy 99]

as long as it don't fuck mine up I ain't fussed

[filipharvey 0]

Thinking about it, I'm sure Dan said he has used an ME3.1 on a GTA to see if they could be used instead due to the GTA's failure rate and rarity, and it was fine other than a few fault codes.

I'm almost certain the pinouts are the same, but I will double check.

Whereabouts are you anyway mate? 156 or 147 GTA - can't remember what you've got!

[smiffy 99]

156 GTA just south of brum place called redditch

[filipharvey 0]

That's even better being a 156, although it doesn't really make much difference if I'm putting your ECU on my car rather than the other way around.

I'd be happy to meet you somewhere, but I'll see if Jim will do it first.

I'll get back to you once I've checked the pinouts and I'll have a word with Dan to make sure all was ok when he tried it.

[smiffy 99]

Ok bud no worries

[filipharvey 0]

Well Casson has said I can use his.

 

But to top all this off, I just went down the road and one of my down pipes has split. Bollocks!

[smiffy 99]

for the ecu

 

for the down pipes are they cf3's if so might have the old GTA ones knocking around will have to check

[filipharvey 0]

Yes, they are CF3 downpipes mate.

[smiffy 99]

I will have a dig around bud, is it the flexi that has split??

[smiffy 99]

I'll ring the garage Monday to see if they still have them:D