Volkswagen Mark IV Forum banner

NO COMMUNICATION FROM ENGINE CONTROL MODULE

27K views 15 replies 8 participants last post by  joey_b  
#1 ·
Hi, as above i have no communication from my engine module, yet the engine does run and drive, i have logged onto my instrument cluster via VCDS and its showing (0) for ECU RESPONSE. Any one with idea what this could be or why? Thanks Joe.
 
#4 ·
Hi, as above i have no communication from my engine module, yet the engine does run and drive, i have logged onto my instrument cluster via VCDS and its showing (0) for ECU RESPONSE. Any one with idea what this could be or why? Thanks Joe.
Have you actually cleared the fault and it's coming back? Can you log on to the ECU itself with vagcom? I've seen that quite a lot on various cars, but has usually gone and stayed gone once it's been cleared.

If it does clear and doesn't come back and you can log on to the ECU, I wouldn't worry about it because the ECU is doing its job.

Jon.
 
#6 ·
Hi, as above i have no communication from my engine module, yet the engine does run and drive, i have logged onto my instrument cluster via VCDS and its showing (0) for ECU RESPONSE. Any one with idea what this could be or why? Thanks Joe.
Have you actually cleared the fault and it's coming back? Can you log on to the ECU itself with vagcom? I've seen that quite a lot on various cars, but has usually gone and stayed gone once it's been cleared.

If it does clear and doesn't come back and you can log on to the ECU, I wouldn't worry about it because the ECU is doing its job.

Jon.
Can't clear the fault as i can't connect or log onto the ecu.
 
#7 ·
Hi, as above i have no communication from my engine module, yet the engine does run and drive, i have logged onto my instrument cluster via VCDS and its showing (0) for ECU RESPONSE. Any one with idea what this could be or why? Thanks Joe.
Have you actually cleared the fault and it's coming back? Can you log on to the ECU itself with vagcom? I've seen that quite a lot on various cars, but has usually gone and stayed gone once it's been cleared.

If it does clear and doesn't come back and you can log on to the ECU, I wouldn't worry about it because the ECU is doing its job.

Jon.
Nope can't log onto the ecu itself with vag com. And when using the measuring block on the instrument cluster its showin (0) for ecu response, so no ecu response is being picked up.
 
#10 ·
Just sorted a similar problem on a skoda octavia. At first the car would turn over but not start. I scanned for codes and could not scan the engine ecu but it would scan all the other.

I changed relay 109 and the engine started and all seemed well until I tried to scan again and it just would not connect. Turns out the owner was having problems with the dashboard and had removed one of the fuses. When the fuse was put back in the dash stopped working but I could scan all the modules.

The fuse was the main one for the dashboard FUSE NO 11.

HTH Kev
 
#14 ·
I dont know mate but the brake light switches on these often cause many of weird problems especially the engine workshop one,have you any brake lights have you noticed? on mine i didnt when it brought up that warning but others have had it when everything is still working and its that fault
 
#15 ·
Just sorted a similar problem on a skoda octavia. At first the car would turn over but not start. I scanned for codes and could not scan the engine ecu but it would scan all the other.

I changed relay 109 and the engine started and all seemed well until I tried to scan again and it just would not connect. Turns out the owner was having problems with the dashboard and had removed one of the fuses. When the fuse was put back in the dash stopped working but I could scan all the modules.

The fuse was the main one for the dashboard FUSE NO 11.

HTH Kev
The symptoms were the same m8, I would try this.

Might not be the same relay or fuse no, but a quick bit of research will tell you what ones.

This is for the not communicating to engine one anyway.

Have you fitted new clocks at all for the other one? If so, the coding may be wrong.