bready Posted April 27, 2021 Report Share Posted April 27, 2021 Hello and thanks in advance for your thoughts and direction. I'm in the process of removing an 01 B5234T3 motor (mated to a 5 speed) and replacing it with an 04 B5234T9 from an automatic. I was under the impression that the motors should interchange but I'm noticing some big differences in the wiring harness leading me to believe I may have an engine management issue. Appreciate whatever input you might have. Thanks Link to comment Share on other sites More sharing options...
andyb5 Posted April 28, 2021 Report Share Posted April 28, 2021 Is your 01 a C70 or S60/V70? The 01/04 motors should interchange pretty seamlessly. Both 01 and 04 run ME7 so you’re good on the ECU side. I’d suspect that most of differences in the wiring harness you’re seeing are due to the added wiring for the automatic vs the manual transmission. When I swapped an 04 T9 into my 00 V70 R, I noticed that Volvo switched the types of connectors for the cam/crank sensors, and the VVT solenoid. Any chance you have some photos of the stuff you’re seeing? It’s been a couple years since I did that swap on my wagon and I don’t have the clearest memory of the subtle differences at this point. Link to comment Share on other sites More sharing options...
bready Posted April 28, 2021 Author Report Share Posted April 28, 2021 Appreciate the reply Andy actually sent you a PM earlier based on your swap. C70 Cabrio. So here are the 2004 harness computer input connectors: I'm assuming the white connector and the related connector on the other end are auto trans related and can be ignored in this case. Here is the existing ECU side input: Other end of the 04: So I guess the question would be this: can I use the existing manual 01 vehicle harness and computer with the 04 motor? I think that is the case. (Planning on getting a new OEM 01 harness). Or do I need to consider another option? Really appreciate it Link to comment Share on other sites More sharing options...
bready Posted April 28, 2021 Author Report Share Posted April 28, 2021 Computer: Link to comment Share on other sites More sharing options...
bready Posted April 29, 2021 Author Report Share Posted April 29, 2021 Was also wondering if there are issues going from the ETM version of the motor(2001) to the ETB version (2004) in terms of software? Link to comment Share on other sites More sharing options...
andyb5 Posted April 29, 2021 Report Share Posted April 29, 2021 On 4/27/2021 at 9:08 PM, bready said: Appreciate the reply Andy actually sent you a PM earlier based on your swap. C70 Cabrio. So here are the 2004 harness computer input connectors: I'm assuming the white connector and the related connector on the other end are auto trans related and can be ignored in this case. (snip) So I guess the question would be this: can I use the existing manual 01 vehicle harness and computer with the 04 motor? I think that is the case. (Planning on getting a new OEM 01 harness). Or do I need to consider another option? Really appreciate it Sorry, I didn’t see that I got a PM. I’ll take a look when I’m not on my phone since I can’t figure out how to access PMs on the mobile version of the site. I guess I’m getting old... It’ll be easiest if you use the 01 harness, rather than going through the effort of removing the automatic transmission wiring from the 04 harness. You have to use the 01 ECM since it is VIN-mated to the chassis and can’t be easily swapped like the earlier M4.3/M4.4 ECUs. There might be some minor differences in the connectors that get used in the 04 cam / crank sensors, and VVT solenoid. You can swap all of those with the sensors from the 01 motor no problem, they output the same signals. Lastly, you’ll need to use the 01 ETM instead of the 04 ETB since the newer module isn’t compatible. You will need to trim a small nub off the 01 ETM to clear the larger 04 PCV breather box. There are a couple photos in my 00 R thread that show what needs to be trimmed, but it’s pretty self explanatory once you’re looking at it all. Link to comment Share on other sites More sharing options...
bready Posted April 30, 2021 Author Report Share Posted April 30, 2021 Really appreciate it - pretty much the conclusions I'd drawn when I went down there today to compare notes with my mechanic. I think I'm good - did have Dave Barton ship out one of his coil pack wiring pig tails since looking for a new 01 Harness was futile. Thanks again for all the help. Link to comment Share on other sites More sharing options...
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