02 XC70 - Throttle body questions.

Post by **scot850** » 05 Aug 2024, 16:49

For some reason, I heard over many years that the P2 throttle body had the same issues as the 99-00 P80 as they got older. I guess my lack of knowledge assumed they were one and the same. Today I had a surprise. They are not remotely the same to look at. In fact the one on this car is labelled as a Bosch product. Were they the OEM?

So here are my questions:

1) Can you swap an ETM from an 01-02 (maybe 03) from the same engine type as in the P80's without further programming?
2) The car runs rough when cold. This could be many issues and the car has a bunch of faults but who knows, maybe a ECT issue as well?
What I did notice though was strange. The pipe from the intercooler to the ETM has a curved section pointing to the ground under the
ETM. It is caked in engine oil. Where would the oil be coming from? Could it maybe be the PCV catch tank? I don't see or feel any oil
leaking down the pipe from the cylinder head to the catch tank. I am used to seeing oil weeping from the plastic hose over the turbo
engines that connects to the intake hose to the intercooler, and this one is no different. Does this mostly come from a worn turbo?

I need to list out the other engine faults. There is a cam fault (recent timing belt?), O2 sensor signal issues, Minor emissions leak and possibly a crank sensor issue to add. It is possible some or all could be connected. I'll have to figure out where to start on this. Interestingly, this engine does not have an inlet CVVT solenoid, only an exhaust one. I need to check as I may have a good used one and gasket.

I'm thinking this may take a lot of time and diagnosing to see where the issues are. I'll need to find resistance values for the CVVT again and check it and clean as necessary, as well as for the ECT if I can access a connector and find the resistances for that too.

Probably will have to pull the ETM as well and give that a good clean and hope it is not too late or making it worse by cleaning!

So much work. But it is possible that the parts just need cleaned (yeh, right!

).

Strangely the PCV glove test showed no inflation and with higher revs suction. I wonder if this has been cleaned when a cam seal was replaced??

Neil.

Post by **jonesg** » 05 Aug 2024, 18:35

besides rough running when cold, what else does it do and what are the codes.
which cam is the fault on ?
do you have vida ?

Post by **scot850** » 05 Aug 2024, 21:33

I have all the codes. I have them stored on my Autel. Now just have to find how to get them off there.

I do also have Vida. Just the Autel takes a lot less set up than my old steam powered laptop!

I'll get the codes posted tomorrow once I get them. Worst case it will be time to fire up the laptop!

Busy day today doing repairs to broken door latch on the microwave (3rd time in 4 years at $150 CDN/ea). Then de-icing the ice maker which had frozen up and was dripping water again. 2nd time this month and less than a year since it was replaced! Who needs old cars when you have crap (expensive) modern appliances!!?

Neil.

Post by **jonesg** » 06 Aug 2024, 09:12

scot850 wrote: ↑05 Aug 2024, 21:33 I have all the codes. I have them stored on my Autel. Now just have to find how to get them off there.

I do also have Vida. Just the Autel takes a lot less set up than my old steam powered laptop!

I'll get the codes posted tomorrow once I get them. Worst case it will be time to fire up the laptop!

Busy day today doing repairs to broken door latch on the microwave (3rd time in 4 years at $150 CDN/ea). Then de-icing the ice maker which had frozen up and was dripping water again. 2nd time this month and less than a year since it was replaced! Who needs old cars when you have crap (expensive) modern appliances!!?

Neil.

yeh vida takes time, i always use an elm327 by default, only resorting ti vida when necessary.
2 weeks ago it took me almost 2 hours to get vida set up and discover the lack of a PEM means it can't read fuel pressure.

Post by **scot850** » 06 Aug 2024, 10:18

Your car does not have a PEM or your PEM had failed? I thought all P2's had a PEM.

Neil.

Post by **jonesg** » 06 Aug 2024, 13:03

scot850 wrote: ↑06 Aug 2024, 10:18 Your car does not have a PEM or your PEM had failed? I thought all P2's had a PEM.

Neil.

2004 was a split year, some did, others have no PEM.
No PEM and no fuel pressure sensor on the rail, it needs a pressure gauge to read pressure.

dikidera · Post by **dikidera** » 06 Aug 2024, 13:15

Do please post the codes. I also learned something about my own Volvo, that sometimes there can be OBD codes and no Volvo specific codes.

hiroku · Post by **hiroku** » 06 Aug 2024, 13:26

jonesg wrote: ↑06 Aug 2024, 13:03
scot850 wrote: ↑06 Aug 2024, 10:18 Your car does not have a PEM or your PEM had failed? I thought all P2's had a PEM.

Neil.
2004 was a split year, some did, others have no PEM.
No PEM and no fuel pressure sensor on the rail, it needs a pressure gauge to read pressure.

Don't mean to hijack this thread, but how does a returnless fuel system work without a PEM? Is there a mechanical fuel pressure regulation in the pump assembly and the pump works on 100% duty cycle at all times?

Thanks

Post by **scot850** » 06 Aug 2024, 15:34

OK, here is the long list. 10 items listed. Now it is possible one may cause another, but there is a lot of diagnostics to be done on top of all the other work. Some may be as simple as possibly cleaning an item and electrical connectors, but at least one means a part replacement, but then 3-4 may be needed:

Fault Codes - (These are Autel codes, but I believe these will also be what Vida would give) :

1) (643A) ECM-643A : Cam Position - exhaust: Signal too low

2) (2810) Permanent fault ECM-2810 : Front O2 (upstream) sensor (HO2S) bank 1 heating : Signal missing

3) (531D) Intermittent Fault ECM-531D : Malfunction indicator lamp (MIL) CEM: Signal missing

4) (280A) Permanent Fault ECM-280A : Front heated O2 (upstream) sensor (HO2S) bank 1 : Faulty signal

5) (3000) Intermittent Fault ECM-3000 : Inlet camshaft sensor : Faulty signal

6) (400C) - ECM-400C : Fuel tank system leakage : Minor leak

7) (6806) Intermittent Fault ECM-6806 : Turbocharger (TC) control system flow fault : Flow too low

(130A) ECM-130A: Air leakage intake

9) (990A) ECM-990A : Idle air trim : Faulty signal

10) (914F) ECM-914F : Throttle valve : Faulty signal

So any suggestions or advice if anyone can see a pattern or if any of the issues could be related your input is appreciated!!

I'm thinking the following actions:

1) Cam Position - Exhaust : The exhaust cam is the only one with a CVVT sensor on it - Remove and clean. Check resistance value, reinstall and see if issue resolves itself. It has the newer style plug connector on it so I may have a good used one worst case Need to compare part numbers

2) O2 Sensor - Upstream - Replace after checking no wire damage

3) Not sure what this is. Is it the warning (check engine) light is missing? It is on.

4) As per 2)

5) Cam Sensor - Is there a separate cam sensor as there is no inlet CVVT solenoid?

6) Emissions system leak - Minor. Will have to smoke the system possibly to find this.

7) TC - Turbocharger intermittent control system fault. Is this a faulty TCU? If so, need to see if I have a spare used one

Intake air leakage - Have to try the brake cleaner/WD-40 spray test or smoke the system.

9) Idle air trim : What/were is this??

10) Throttle valve - Faulty signal - If this means the ETM/Throttle body. It seems really oily, so will require to be remove and cleaned. The refit and see if the issue is still there.

There will still be the possibility of another issue that is not coded. If the cold rough start does not get fixed, may have to test/replace the ETC

So added to all the other issues, the work and cost to return this car to decent and safe condition could be a huge investment in time and money.

Neil.

Post by **volvolugnut** » 06 Aug 2024, 18:00

My thoughts:
You can get a cascade of faults from single or a few real issues. Try to clear and see what returns. You still have the record of the original fault codes.
Ignore the fuel tank leak (no. 6).
Be sure the battery is fully charged to avoid low voltage caused faults when you clear codes and try restart.
I would start with scan of ETM position reading with live data from the scanner if available.
Check this link to XeModex for ETM FAQ and tech info:
https://xemodex.com/us/product/electron ... r-service/
I have used XeModex and was happy with results.
I would also try to clean the ETM before anything else. This is No. 10. My 2001 V70 T5 with 210K miles has some oil in the turbo hoses. Not enough to pour out, but oily. It runs fine (usually).
I have replaced my exhaust CVVT. Mine does not have intake CVVT. Dirty oil has been reported to cause faults for CVVT. I would try clean and reinstall.
volvolugnut