2000 p2 V70 T5 not starting

**Dave_T5** · Sunday 8th February 2015, 07:27

Hi, I have recently purchased a v70 t5 geartronic as a non runner, with the hope of getting it going once again.

It was apparently running fine, then after it was left for a few weeks it would no longer start. The battery was removed and recharged, but still no joy.

When I took ownership, the battery was dead, so replaced it with a charged one (and carrying out testing with charger/jump leads/booster pack connected).

The engine cranks, but will not fire. It seems to be cranking fine, no obvious lack of compression and cambelt ok. First thing I noticed was no EML on the dash with ignition on, and unable to read codes with a generic obd reader. This led me to check fuses and relays for ECM feeds (all ok) and also the earth points on both front wings (a bit grotty but good contact to ground, removed and cleaned anyway). After this the EML decided to light up with the ignition on, so tried starting again but still no luck. Read fault memory again, none logged/showing on the obd reader. Tried starting with easy start through the air filter housing, fired for a brief moment then died again. Fuel level was low, but above the 'red', so topped up with 10 litres anyway. However, by the time we got back from the petrol station, the EML decided to stop lighting up again!! This time, no amount of fiddling with the earth point or wiring loom had any effect.

Other checks carried out - fuel in fuel rail under pressure, so pump/relay ok.
Tried cleaning immobiliser antenna contacts, and also swapped over antenna (assumed working ok as when attempted to crank with antenna removed from the barrel, the engine didn't even turn over).
Spark plugs worn, but not wet, so assume fuel not being injected.
Tested ECM relay with 9 volt battery, clicking open/closed ok.

So, on to the wiring diagrams...
Chassis to battery earth ok.
Engine to chassis earth ok.
Permanent 12v to ECM OK.
Ignition switched 12v to ECM ok.
Both earth wires from ECM ok.
With ignition on, the ECM is earthing the relay FMA2 (ECM relay)
Has voltage on CAN wires in and out of ECM and also in and out of the TCM (2.4/2.6v, from experience this is about right, but don't have a scope to check pattern)

Beginning to suspect ECM at fault, so removed and took apart, found a very small amount of water ingress which had started to corrode around a chip on the board. Carefully cleaned, dried and refitted ECM, still no joy.

Just wandered if anyone else has had similar issues, or could spread some light on this before I send the ECM away for inspection/ repair.

I know these cars can suffer with ETMs and DIMs, could the lack of EML be a red herring?? Sorry for the long post, thought it best to list everything I had done so far...

Dave

**Dream3r** · Sunday 8th February 2015, 08:13

I can clone a suitable replacement if you find a doner ECM, assuming the old one boots ok.

If it's had ingress then there could be a world of problems with it. CAN voltage is about right, there should be two pairs though?

Can you read the ECM codes with VIDA? If not it's toast/not booting/corrupt.

Also make sure the ECM is seated correctly.

**Dave_T5** · Sunday 8th February 2015, 08:57

Hi, thanks

Yes, 2 pairs of CAN wires on both ECM & TCM.

The ecu is seated correctly, and all voltage readings were taken with the system plugged in and switched on.

I don't have access to VIDA, so far just using a multimeter and wiring diagrams.

Just wanted to check as much as possible before either getting the ECM checked out / repaired etc, or booking the car into a dealer / specialist.

Dave

**Ettienne** · Sunday 8th February 2015, 09:01

My local breakers has a 2001-ish auto in (you'd have to confirm that) you could get lock set ecu etc? Or just ecu and have it reprogrammed,
Have you got vida?

Could he not just use a code reader?
I have both but it's a bit of a drive from me to you.

Harris car breakers emsworth

**Dream3r** · Sunday 8th February 2015, 09:02

If someone near you has VIDA it will be pretty easy to see if the ECM is booting via the diagnostics tab. (It will not be litten)

**Harvey** · Sunday 8th February 2015, 09:06

Strange ,wonder if someone jumped started it wrong (mixed the leads up).
Have you checked the main power fuses next to the battery ? Need to remove battery to get to them.

**Dave_T5** · Sunday 8th February 2015, 09:34

Haven't checked the main fuses yet, assumed ok as I seem to have 12v everywhere I should have. Also, for a brief time I had the EML lighting up (Indicating the ECM booted up and communicating??).

Few more checks to do, then sounds like getting it checked with VIDA...

Only possible anomaly with readings was on the pin that earths the relay, there was approx 1 volt still present going into the ECM With the ignition on and relay engaged. (12v with ignition off and relay off). Wasn't sure if this was normal due to an earthing resistor in the ECM?

**Dave_T5** · Sunday 8th February 2015, 09:49

Originally Posted by Dream3r

I can clone a suitable replacement if you find a doner ECM, assuming the old one boots ok.

If it's had ingress then there could be a world of problems with it. CAN voltage is about right, there should be two pairs though?

Can you read the ECM codes with VIDA? If not it's toast/not booting/corrupt.

Also make sure the ECM is seated correctly.

If I go down this route, do I just need an ECM with the same part number?

**Dave_T5** · Sunday 8th February 2015, 23:00

Other updates:

Still no further in finding anything definitive, so it looks like I'm going to need to either send the ECM away for testing and/or get a VIDA/Dice and have a go with that.

The other thing I've noticed is to do with the dash, the STC light stays on and the message 'stc service due' (not sure if just needs to be driven after battery being disconnected?). Also the transmission indicator seems a bit erratic, it doesn't always change display when changing gear, and in manual mode, it only displays 2+4. After about 5-10 seconds, it just changes to a dash (-) until the ignition is cycled. Just before i packed up for the day, another message popped up 'SRS - airbag service urgent', not too bothered at the moment, might be completely irrelevant, but thought i'd mention it.

ps - does anyone have any recommendations for ECU testing / repairs? Dream3r, do you offer testing, or just cloning?

**Dream3r** · Monday 9th February 2015, 07:36

Originally Posted by Dave_T5

Other updates:

Still no further in finding anything definitive, so it looks like I'm going to need to either send the ECM away for testing and/or get a VIDA/Dice and have a go with that.

The other thing I've noticed is to do with the dash, the STC light stays on and the message 'stc service due' (not sure if just needs to be driven after battery being disconnected?). Also the transmission indicator seems a bit erratic, it doesn't always change display when changing gear, and in manual mode, it only displays 2+4. After about 5-10 seconds, it just changes to a dash (-) until the ignition is cycled. Just before i packed up for the day, another message popped up 'SRS - airbag service urgent', not too bothered at the moment, might be completely irrelevant, but thought i'd mention it.

ps - does anyone have any recommendations for ECU testing / repairs? Dream3r, do you offer testing, or just cloning?

Testing I can do but earlier I gave you the easy way with vida, if someone near you has it?

Originally Posted by Dave_T5

If I go down this route, do I just need an ECM with the same part number?

Yes, just the same part number if it's a cloning job.

**Dave_T5** · Monday 9th February 2015, 18:22

Hopefully will be getting it read with VIDA in the next week or so, going to leave it until then.

Thanks for everyone's input so far.

**Dream3r** · Monday 9th February 2015, 18:44

Once you get to the diagnostics tab if ECM is not litten up then it isn't booting/corrupt/not plugged in

good luck.

**LeeT5** · Monday 9th February 2015, 20:58

Have you checked for 5v at the MAF?

**Dave_T5** · Monday 9th February 2015, 22:00

Originally Posted by LeeT5

Have you checked for 5v at the MAF?

No, not yet. Primarily trying to communicate with ECM first before looking at specific items. Though when I initially started looking at it, I did try starting it with the MAF disconnected (no joy). Will probably have another look this weekend.

**LeeT5** · Tuesday 10th February 2015, 08:42

Originally Posted by Dave_T5

No, not yet. Primarily trying to communicate with ECM first before looking at specific items. Though when I initially started looking at it, I did try starting it with the MAF disconnected (no joy). Will probably have another look this weekend.

Just unplug the MAF and probe for 5v with the ignition on. This will tell you if the ECM is live and has power. It will cut your diagnosis time down a lot. If no 5v then double check ALL the fuses with ignition on. Those that are live should have 12v both sides of the fuse. Very quick and easy to check with a power probe. It would have been one of my first checks.

**pillapow** · Tuesday 10th February 2015, 10:30

Turn the engine over at the crank by hand with ignition on, listen for fuel being injected into chamber. If no fuel being injected, is it not the crank position sensor that controls this?

**LeeT5** · Tuesday 10th February 2015, 11:15

Originally Posted by pillapow

Turn the engine over at the crank by hand with ignition on, listen for fuel being injected into chamber. If no fuel being injected, is it not the crank position sensor that controls this?

As great as this may sound, have you actually tried doing this in person? It's almost impossible. You'll struggle like hell to turn the engine over with all the plugs in, let alone trying to listen to other stuff. You'll be too busy moaning, groaning and swearing trying to do whats been suggested. Sorry Pillapow but it's not how any good mechanic/technician would diagnose.

Good idea but not practical.

**pillapow** · Tuesday 10th February 2015, 14:31

No, you take the plugs out!!

I've used this method a few times to ascertain if an injector is working.

Albeit not on a T5 engine, but its a good method!

**LeeT5** · Tuesday 10th February 2015, 15:11

Originally Posted by pillapow

No, you take the plugs out!!

I've used this method a few times to ascertain if an injector is working.

Albeit not on a T5 engine, but its a good method!

Ah, you didn't say that!

Surely it's quicker and easier to check for 12v and switching signal at the injector harness on crank using a multimeter and noid light and the check the resistance on the injector itself?

**Dave_T5** · Tuesday 10th February 2015, 22:40

Originally Posted by LeeT5

Just unplug the MAF and probe for 5v with the ignition on. This will tell you if the ECM is live and has power. It will cut your diagnosis time down a lot. If no 5v then double check ALL the fuses with ignition on. Those that are live should have 12v both sides of the fuse. Very quick and easy to check with a power probe. It would have been one of my first checks.

I will give that a go when I next look at it, probably won't be until the weekend now though. I have checked all fuses in the drivers a-pillar and under-bonnet with a multimeter (both sides), and all ok.