2008 Acura Csx B1168 B1170 B1173

Tom Mobile Technician Alberta Posted   Latest   Edited  
Updated
Electrical
Network Communications
2008 Acura CSX Technology 2.0L (K20Z2) 5-spd (SPFM)
B1168
B1170
B1173
No Crank / No Start

Here is a interesting one. The vehicle is fine when first started, about 3-5 minutes when running, it start acting up just like in the uploaded video. I starts up slower and speeds up than dies. First the PCM/ECM was changed thinking its over heating or a short. I added additional grounds to the engine and chaise. Plus its an easy swap for a test but same problem. Cluster in the BCM no communication with ecm. Ran A scope at the data line 2.47v and 2.6 ish Next i replace the bcm fuse box as data lines run threw it. Same issue. removed and by passed data line connector c206 by the passenger wheel and same issue. Ran data line from pcm 36 37 red white wire to the back of the cluster, same issue. I also have disconnected the cluster, the airbag module thinking they are shutting down the system. Realized that the pcm/ecm is losing voltages on and off. So i have replace the front fuse box all used parts, still the same problem. I had the mechanic disconnect the ignition coils one by one as they are on the same line as the pgmfi relay while this problem is happening still the same problem. Added power to the pgmf1 relay at the pcm, as it was giving me 12v to 6v to 2v while it was happening and i blue the PCM. Replaced the PCM same issue. such a simple system, but im missing something. any advice? Also to start again, codes need to be cleared or ignition cycled.. 

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Arsalan Owner/Technician
District of Columbia
Arsalan
 

Have you checked your grounds makes sure they are clean and reading 0.05v or less?

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Tom Mobile Technician
Alberta
Tom
 

Im think I did check grounds, I even added grounds but I will double check, thanks

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Paul Owner/Technician
California
Paul
 

I once had a car come in with a similar problem (rhythmic on/off power) and found that an alarm had been badly mis-installed. The relay for flasher output had been wired in series the battery power to the ignition switch (but on the normally closed terminal). The siren was disconnected and the alarm would randomly activate and the only sign was the ignition power cutting out, it was pretty…

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Tom Mobile Technician
Alberta
Tom
 

This car doesnt have anything after market and no accidents, just all stock.

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Olle Instructor
Minnesota
Olle
 

Have you checked the charging system?

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Tom Mobile Technician
Alberta
Tom
 

from what i remember it was charging properly, but ill ask the mechanic to disconnect the alternator to see if something changes. Thanks for the idea

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Tom Mobile Technician
Alberta
Tom Update
 

When the vehicle is running and its acting up again. When the alternator control gets unplugged. The vehicle starts running good. so i asked the mechanic to change the alternator thinking its creating a short when its heats up but still the same problem. Possibility might be a grounding issue to the system. If any one else have an idea please don't hesitate to send some info my way.

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