99/2000 V70xc wiring diagram needed.

[PNWxc]

First off, I want to thank all you guys for your contributions. Without them I would have never gotten my first wagon running, let alone my 2nd.

Now, to my problem:

Bought a 99 xc to replace our 2000 that got totaled. 99 was bought as a project, but I put a battery in it and it fired right up. Seemed to run/drive fine minus some horrid axles.

But running good or not, the engine I built for the 2000 was freshly stage 0’d, so I figured I’d just drop the drivetrain out of the 2000 into the 99.

Got the powertrain out of the 2000 and into the 99, and I had an ABS problem witch seemed to be resolved by unplugging and replugging the abs module. (Car has a Programa rebuilt module, abs light does NOT stay on, but functions) but I’ve also got a problem with what I suspect is the wiring from the trans. I’ve cleaned the PNP switch, and tried the one that was originally in the car and that didn’t help at all. Still throws the trans in limp mode if you manually select 1st gear. Can clear the codes and drive in D range without making the trans mad, even if you hammer on it.

But the ecu loses connection with the trans any time you manually select 1st gear. I’ve tried both PNP switches I have, one of them cleaned up really good. Same resulting limp mode when selecting 1st gear.

I’ve kinda reverse-engineered some diagrams for specific things from the 97-older diagrams I have, but the 99/2000 are just soo much different than the early P80 in many other areas.

I’ve got electrical test equipment, and know how to use it, but I’d rather have a diagram to look at, rather than unwrap my whole ecu harness just to trace wires, witch I’m probably going to have to do anyway.

Speedo is rock solid now, and ABS appears to be happy, but this problem of losing ecu connection when manually selecting 1st gear is weird.

Most weird thing, is BOTH cars ran/drove fine before I did the powertrain swap. Only codes I had were 02 sensor codes.

After the swap, I was getting ABS and trans communication codes. Cleaning abs connection and reconnecting seemed to fix ABS, but I’m still left with a couple codes that don’t come up unless you shift down to 1st gear from the shifter. Specifically 1618 and 0705 codes.

Fluid in trans is fresh maxlife. Doesn’t matter if trans is warm or cold, doesn’t even matter if it’s running. I can turn on the key, pull the shifter back to 1st gear, and 1-2 seconds later it throws the trans in limp mode. Clear the codes, and the trans works perfectly unless you try manually selecting 1st gear.

Only major difference now is that the external trans cooler I had on the 2000, wouldn’t fit on the 99, the rail on the bottom of the 99 isn’t thick enough to drill and bolt up my cooler. But I seriously doubt the lack of cooler is causing a wiring issue.

I know you guys are gonna say it’s my ABS module, but I REALLY don’t think it is. The light goes out when it should.

Only thing I have not tried, is installing the dead oem abs module from the 2000 into the 99.
The light never went out, and I could never clear the ABS codes, but the trans always worked, and the Speedo always worked. May still try that just to rule the module out.

Btw, when I swapped engines, I left the 2000 ETM on the engine. Shouldn’t make a difference what ETM is on the engine, right?

My gut is telling me I may have broken a/some wires somewhere in the harness. But FOR THE LIFE OF ME, I can not find a me7 harness diagram for a Volvo, and I’m not so sure the VW me7 is similar enough to use one of those diagrams.

I’ve been able to find diagrams online for every one of my previous cars, but not this one.

Have a Haynes for P80 and P2 cars, beings as I have late p80s. But neither manual has complete diagrams for the ecu wiring.

Should I figure out where the potential broken wires are? Or just swap the engine harness for the supposedly-known-good harness out of my 2000 parts car? Looks like a real bear of a job to replace the harness with the engine still in the car.

I really don’t think my trans or ABS modules are the problem here, nor do I think a replacement PNP would fix it.

One thing I will add tho, it was 100% humidity the day I made most of the wiring connections. It was literally raining inside the shop because the air could not hold any more moisture.

I like to think I’m a competent mechanic/diagnostician, but this has me going in circles.

Any knowledge you great guys have to offer is greatly appreciated.

I’m on week 2 of a 3 day engine swap…

[scot850]

Is the 00 V70XC the same 4 speed auto or is it a 5 speed auto? In North America it would I recall be a 4 speed auto. But the non-Turbo (NA) FWD and the V70R got 5 speed autos. I recall seeing someone over here selling a late 2000 V70XC and claimed it had the 5 speed auto but not sure they were correct on that one.

I know the ECU and TCU are read through the instrument cluster. I believe it only identifies if it is a 4 speed or 5-speed. If it is not what it expects it does not work. Now I don't know if it goes to the level of the ECU in terms of VIN# identity.

Neil.

[PNWxc]

Both cars are aw50-42awd cars.

But the 99 is pretty early (02/98) and the 2000 is pretty late (09/99)

I don’t think that really matters tho. They are both 4spd me7 cars.

99, I believe that all Volvos were 4spd, but 2000 n/a v70, and v70r had a 5 spd.

Again, both transmixers are definitely the same that I’m working with.

Everything works great unless you manually select 1st gear.

(The ECUs are definitely NOT vin coded to the cars, btw)

[PNWxc]

And just to throw it out there, yes I know how to use the search function, and it didn’t really give me anything worth while.

Thank you to everyone taking time to help me!

[abscate]

But the 99 is pretty early (02/98) and the 2000 is pretty late (09/99)

I don’t think that really matters tho. They are both 4spd me7 cars.

powertrain management inME7 had a chassis break in early 1999 models,so that may well be your problem

By agreement with Volvo, we do not host the wiring diagrams here but they are public on Volvo UK Fora

You might be in subtle enough territory you will need to fire up VIDA to get North American wiring diagrams for late P80 ME7 though.

Close enough: Horseshoes, hand grenades, atomic bombs, wiring

[PNWxc]

I figured out enough of the wiring harness on the 99 by staring at the 2000 harness laid out, and probing wires with my volt meter.

Then tested continuity of those clear from the switch to TCU, and those are all fine.

Do you think alldata diy will have diagrams for 99/2000 me7 cars?

Or are the uk forums my only sure thing?

[abscate]

Alldata will have them but it isn’t cheap. $50 for one month.

VIDA is free and more comprehensive

[PNWxc]

Figured out the problem. It was having the right combo of parts in the car to make everything happy.

1st off, the 99 & 00 shifters are 100% different, only part shared between them is the shift cable. The shifter is different, and the shifter arm on the trans is different. The TCU is the same, but with a different shift program. Shifter is gated differently. 99 has 6 positions on shifter (P,R,N,D,3,L) and a long selector shaft lever on the transmission. 2000 shifter has 7 positions (P,R,N,4,3,2,1) with a short selector shaft arm.

99 TCU freaks out if the selector shaft on the transmission ever finds its way into the 1st gear position. It was never meant to be manually shifted any lower than 2nd gear.

I was under the impression that the ECU & TCU were married via vin#, but now I’m certain that this car doesn’t care what TCU it has in it. Installing the 2000 TCU cured all my problems. Everything works as it should now. I can manually shift all 4 gears now without any codes, or trans going into limp mode.

I had to match the TCU with the appropriate length selector shaft arm to keep everything happy. I didn’t absolutely NEED to change out the actual shifter in the car, but the 00 shifter has the right amount of notches in the gate.

I have no more p1618, 1633, or 0705 codes.

[abscate]

This’s is awesome deep info so I’ve added it to the 1999 2000 “ bastards” thread

[PNWxc]

Thank you. If me pulling my hair out for a week, helps someone with a 99-2000 bastard, then I’m all for that.

I can tell you from personal experience that the 99 and 2000 cars are similar, but very different in certain areas. They are BOTH 1 yr only cars.

I come from the land of VW, I’ve never seen anything like this before in my life, and I’ve been working on cars 20+ years.

This whole fiasco happened because our 2000 got smashed by a dodge. Was under the impression that 99 & 00 were the same car when I was looking for another cheap car. Found out the hard way that they are close, but definitely NOT the same.

The 2000 SE cars REALLY are special.