Ecu won't run fuel pump
#1
Ecu won't run fuel pump
I'm helping a friend with his 2002 TT Quattro convertible. I've found that the ecu does not trigger the fuel pump relay. It doesn't run to prime the fuel system when the door is opened, or when the motor is started. (gave it some fuel to get it started momentarily). Also found the pump does not produce any fuel pressure if powered externally. We're ordering a new fuel pump to solve that part of the problem. Wiring and fuses check out ok.
What would cause the ecu not to turn on the fuel pump?
What would cause the ecu not to turn on the fuel pump?
#3
When I opened the fuel tank I found both sides were empty despite the fuel gauge reading almost half a tank. I added fuel and performed a ecu reset. After that the motor started right up.
#6
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Never heard of a cluster not causing a fuel pump to turn on. Not to say it doesn't have problems of its own though. The fuel gauge issue could certainly be a cluster issue. It could also be a sending unit problem too.
Assuming you checked all of the relays too? It could be the ECU since that is what triggers the fuel pump relay to turn on.
If the pump doesn't power on when you test it directly then it sounds like you already found the problem.
Assuming you checked all of the relays too? It could be the ECU since that is what triggers the fuel pump relay to turn on.
If the pump doesn't power on when you test it directly then it sounds like you already found the problem.
#7
The cluster definitely has problems. More than just the gas gauge not working properly. It was definitely the ecu reset that got the fuel pump turning on again. The pump did run when powered directly and is picking up fuel again. The owner is happily driving his car every day despite the display issues, which he'll no doubt get fixed when he gets a bit of extra cash available. Thanks for the help.
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#8
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Great to hear!
Here is a link for when they are ready.
Audi A4 A6 S4 TT Allroad Gauge Cluster Rebuild
We also have some helpful and information videos on that page too specific to Audi TT.
Here is a link for when they are ready.
Audi A4 A6 S4 TT Allroad Gauge Cluster Rebuild
We also have some helpful and information videos on that page too specific to Audi TT.
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