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Is it true that you can't use a used ECM on 99 & later? V70-XC70 1999

posted by someone claiming to be Peter on Mon Jul 24 12:57 CST 2006 [RELATED]

I may have killed my ECM. While waiting for the dealer to diagnose, I checked the price of a new one from Brentwood Volvo ($939.58 plus core) and a used one.
The Volvo specialty wrecking yard in Sacramento CA says that it is impossible to use an ECM from a wreck on 99 & later cars. New ones only. Is that true? The VADIS machine cannot reprogram a computer? What happens when a new ECM is no longer available because some component on the board is no longer made?

Also, anyone have an opinion on whether or not I need a new ECM? I did a compression check, put in new plugs (same Bosch plugs as I took out) and afterwards the car would not start. Before starting, I checked www.alldatadiy.com to see if any special precautions were necessary on the distributorless ignition, and they showed nothing. (In fact, there was a diagram showing a compression gauge in a plug hole, and a disconnected plug wire lying next to it.) I am wondering if cranking the engine with everything connected except the spark plugs zapped the computer (or all 5 coils)?

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Is it true that you can't use a used ECM on 99 & later? V70-XC70 1999

posted by someone claiming to be Peter on Mon Jul 24 15:48 CST 2006 [RELATED]

Update - Dealer is now saying Camshaft Position Sensor and RPM sensors both need to be replaced in order to get the ignition to fire. Total $656 with labor. I'm kind of skeptical that both would be bad. When I asked if I had to buy them if they didn't fix the problem, they were evasive & said "we know they are both bad because they are not putting out signals". (Of course, if there is no power into them, there would be no signal out.)

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Is it true that you can't use a used ECM on 99 & later? V70-XC70 1999

posted by KlausC on Tue Jul 25 06:18 CST 2006
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last visit: Fri Oct 24 10:15 CST 2014

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Slow down... The chances of an ECU going bad are slim to none, unless you disconnect the battery while the engine is running. Besides, doesn't IPD have a chip replacement for the same price?
If all you did was take out the plugs/coil to run a compression test, that won't hurt anything. Unless you managed to tug on the wires and now have a poor connection to the plug wires. When I change the plugs on my 5 cylinder engines, I always check to make sure the other end of the wire is seated securely.
Not having a signal from the crank pos sensor or the rpm sensor, is possible if the connections are loose. I also doubt that both are deaed at the same time.
Check and recheck the wires,

Klaus
--
(V♂LV♂s 1995 854T, 1998 V70R)

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Is it true that you can't use a used ECM on 99 & later? V70-XC70 1999

posted by MadeInJapan on Mon Jul 24 13:11 CST 2006
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last visit: Sat Oct 2 06:34 CST 2010

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Very rare that an ECM gets fried. Others will chime in, but most likely another issue.
--
1998 S70 T5 Emarald Green Metallic, 2004 V70 2.5T Ruby Red, Previous Owner of Black '94 850 Turbo Wagon. My cars have been running so well lately they've got me worried.

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