2004 S80 2.5T FWD CEM Replaced Will Not Start

[shadowtaker]

Hello,

I have a 2004 S80 2.5T FWD. The vehicle started to malfunction when the season started to change to summer. The vehicle will drive fine for about 20-30 minutes. Suddenly, the vehicle will enter "limp mode." The dashboard lights will not work with the exception of the Check Engine and the ABS. None of the gauges will work. The passenger lights will not turn off. The head lights will not turn off. The A/C shuts off. The power doors and windows will not work. To turn the lights off I have to disconnect the battery. I used a OBDII tool to look at any error codes. The vehicle showed a U0073 (ECM-E003) and a P0863 (ECM-530B).

I diagnosed to the problem to be the CEM. Since the dealer wants over $1500 for a new CEM and software, I removed the CEM and did a repair and replace with XeModex. I have received the repaired CEM from then and installed it in the 2004 S80. The vehicle will crank but will not start. Any ideas?

[doublebug]

First you need check if there is fuel pressure.

[SuperHerman]

You have not provided enough information. I will speculate.

Season change equaled water intrusion into car which damaged CEM.

First double check all your relay and shunt placement work - maybe you installed something in wrong location. Next check fuses would be my next stop, namely anything engine/fuel related. Also check your relays and shunts. Isolate relevant ones and swap them with other ones.

If this does not work, what was repaired on the CEM? What circuits were repaired. You will need to call and ask XeModex for this information. From here I would back track.

Based on the information you provided it is hard to tell if the CEM is related to the non-start or two independent events. Comment on fuel is good - again check fuses and relays that are related.

[shadowtaker]

You have not provided enough information. I will speculate.

Season change equaled water intrusion into car which damaged CEM.

First double check all your relay and shunt placement work - maybe you installed something in wrong location. Next check fuses would be my next stop, namely anything engine/fuel related. Also check your relays and shunts. Isolate relevant ones and swap them with other ones.

If this does not work, what was repaired on the CEM? What circuits were repaired. You will need to call and ask XeModex for this information. From here I would back track.

Based on the information you provided it is hard to tell if the CEM is related to the non-start or two independent events. Comment on fuel is good - again check fuses and relays that are related.

The issue is resolved. The Fuel Pump Relay was in CMI11 and in needs to be in CMI12.

[SuperHerman]

Excellent resolution.