My TSX, manual transmission, died on me while driving. Motor will turn over.
Towed it home, tried to read codes and my reader said "no connection with ECU". Tried a different code reader and same issue.
Checked fuses, all good. Checked intake manifold ground, good. Checked power to ECU, good.
Immobilizer light comes on and flashes. Tried a different key, same issue.
Also when ignition is turned on I get "Check TPMS" and "Check emission system"
Removed ECU and inspected for corrosion. Looks clean.
Any ideas?
Bad ECU, TPMS module, immobilizer module?

Thanks,
Russ

 

try looking under the hood fuse box for a fuse labeled ECU

 

Yup, already did that. Fuses are good and there is power to the ECU.

 

with the green key icon flashing and power to the ecu, it leads me to believe that the immobilizer has been disconnected from the ecu. will need an HDS unit to reconnect the keys to the ecu

 

Possibly a failing ignition switch. Engine shut-down while driving is one symptom.
Easy to replace. It piggy-backs the key cylinder in under the steering column cover.

Item 8: https://www.acurapartsforless.com/v-...ination-switch
It should also be available at local auto part stores.

I had to replace switches in my 1999 Acura TL and 2004 Accord

 

I will look at that but not sure how it would cause the ECU to not communicate with the code reader. Everything seems to power up.