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Pulled ECM and put back in...car will not start.

Help, Advice, Owners' Discussion and DIY Tutorials on Volvo's stylish, distinctive "P2" platform cars.

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precopster
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Re: Pulled ECM and put back in...car will not start.

Post by precopster » Fri Apr 06, 2018 7:15 am

Always used the tool on multiple cars and never had a problem. Why does everything look so easy on You Tube?
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abscate
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Re: Pulled ECM and put back in...car will not start.

Post by abscate » Fri Apr 06, 2018 7:17 am

Mike - can you get a non-fatal CEM-TCM/ECM comm error on a P2?
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precopster
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Re: Pulled ECM and put back in...car will not start.

Post by precopster » Fri Apr 06, 2018 7:31 am

The question is whether he would have have that error by using the tool? As mbrian states the TCM and ECM share the power source in series with TCM being number 1 so it is more than likely a pin pressure issue.

Removing TCM on a working car and seeing what Vida comes up with would be interesting.
Current cars:2002 XC70, 2006 Ssangyong Rodius (Stavic), 2006 XC90 2.5T, VW Transporter 2.5TDI

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Re: Pulled ECM and put back in...car will not start.

Post by chrism » Fri Apr 06, 2018 10:10 am

Home spun ECM tool:

download/file.php?id=35721

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Re: Pulled ECM and put back in...car will not start.

Post by mrbrian200 » Fri Apr 06, 2018 11:10 am

I believe the ECM still gets power and ground if the TCM is removed: it's the connections to CANbus that are severed. With the ECU off the network the immobilizer system can't complete it's system checks, injectors and spark will never fire. Immobilizer function is shared between the ECU, CEM, and UEM. This is so that a thief would have to completely tear apart the vehicle, replace all three modules, and potentially reprogram everything in order to drive a vehicle away under it's own power.

Warning. Evil commentary ahead..
So theft rates are lower overall, but determined thieves now resort to carjacking. 20+ years ago owners rarely if ever came in direct contact with thieves, but interacted strictly with law enforcement. Which in most cases doesn't result in the owner's life being threatened at knife/gunpoint.

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