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ME7.5 cranks, but no spark, no fuel & no communication
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Topic: ME7.5 cranks, but no spark, no fuel & no communication (Read 1393 times)
ypzilon
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ME7.5 cranks, but no spark, no fuel & no communication
« on: April 09, 2025, 12:18:37 PM »
I have a Audi TT 1.8T -00 180hp.
It cranks, but I have no spark, the fuel relay isn't activated and I get no response from the ECU with VDCS, OBDeleven or iCarsoft. But I can connect to the other modules in the car.
Instrument and ABS has error codes, no communication with ecu.
The ecu has immo off and is tested OK in another car and the TT behaves just the same with the other cars ecu connected.
I have ground at pin 1 & 2.
12V switched at pin 3, 12V permanent at pin 62.
All fuses are OK.
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fknbrkn
Hero Member
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Posts: 1511
mk4 1.8T AUM
Re: ME7.5 cranks, but no spark, no fuel & no communication
« Reply #1 on: April 10, 2025, 02:05:08 AM »
check the grounds of ecu also
all checkings must be done with ecu plugged in
check ecu for a flooding
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ypzilon
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Re: ME7.5 cranks, but no spark, no fuel & no communication
« Reply #2 on: April 10, 2025, 02:42:45 AM »
I have messured the ground and supply voltage with the ecu connected.
Flooded? You mean that water could have came into the ecu?
The ecu works in another car and the other cars ecu behaves just the same in the TT, so it must be car related.
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joshuafarwel
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Re: ME7.5 cranks, but no spark, no fuel & no communication
« Reply #3 on: April 10, 2025, 02:10:11 PM »
Just had this issue. It was the ecu relay getting a bad internal connection.
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ypzilon
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Re: ME7.5 cranks, but no spark, no fuel & no communication
« Reply #4 on: April 11, 2025, 01:27:08 AM »
Solved!
Broken wire to pin 62.
I don't really understand, because I checked the voltage at pin 62 with the ECU connected and it was 12,6V.
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