2.5 AUDI PETROL 5cyl SIEMENS SIMOS NO HT !!
09-15-2008, 12:14 PM
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2.5 AUDI PETROL 5cyl SIEMENS SIMOS NO HT !!
Hi guy's,
Can you help with the :-
NO HIGH TENSION :-SUSPECT THE IGN COIL DRIVERS IN THE ECU, but would like to confirm before send ing the ECU for repair.
Got a fault on my UK Spec 1996MYR 2.5 Transporter Siemens 5WP4 240 ECU with VAG pt no 023 906 024 t.
Have done the hall effect tests, result was got a +5v -0v square wave at ecu PIN 44 green white wire.
Got +12v to coil but get NO switching of the Green wire (tested continuity of wire to ECU ok.
Fitted new GND wire to pin 24 (1.5mm brown wire)found 4.5 ohms resistance between wire and gnd with ecu m/plug disconnected and testing it to battery neg post..not sure of this wires function ??? any thoughts.The main heavy Brown GND wire to the ECU is ok ..goes to a stud next to the ECU. Coil GND wire is ok ..same gnd point.
Tested ..result was as before get a 1sec HT at plugs then nothing !!!
Do not have a full pin out of the ECU's I/O's ? for this ECU
What appears to be the main IGN +12v input wire to the pin 23. ECU , has no voltage with the IGN ON !! i have traced where in the fuse box the black/yellow wire to investigate where it gets its feed from RELAY ETC ????? no RELAY OR FUSE IS CONNECTED TO THE WIRE tested continuity of terminal the from the fuse box white m/plug to the ECU conn is ok,,,,,,,,,,,IT appears not to use this wire to supply the ign +12v to the ecu ???any thoughts ??? as a note on this I found that ECU is supplied with IGN +12V on the following pins PIN 8 and on PIN 43 (This pin is supplied by the immobiliser circuit and works ok)
I am trying to test the all the I/O's to the ECU before condemning the ecu !! found surface corrosion the ally housing but pins are clean and no sign of water ingress when took the casing off for inspection .
Sorry about the long post : )
Any tips or guidance on this would be much appreciated.
Regards
Derrick
Can you help with the :-
NO HIGH TENSION :-SUSPECT THE IGN COIL DRIVERS IN THE ECU, but would like to confirm before send ing the ECU for repair.
Got a fault on my UK Spec 1996MYR 2.5 Transporter Siemens 5WP4 240 ECU with VAG pt no 023 906 024 t.
Have done the hall effect tests, result was got a +5v -0v square wave at ecu PIN 44 green white wire.
Got +12v to coil but get NO switching of the Green wire (tested continuity of wire to ECU ok.
Fitted new GND wire to pin 24 (1.5mm brown wire)found 4.5 ohms resistance between wire and gnd with ecu m/plug disconnected and testing it to battery neg post..not sure of this wires function ??? any thoughts.The main heavy Brown GND wire to the ECU is ok ..goes to a stud next to the ECU. Coil GND wire is ok ..same gnd point.
Tested ..result was as before get a 1sec HT at plugs then nothing !!!
Do not have a full pin out of the ECU's I/O's ? for this ECU
What appears to be the main IGN +12v input wire to the pin 23. ECU , has no voltage with the IGN ON !! i have traced where in the fuse box the black/yellow wire to investigate where it gets its feed from RELAY ETC ????? no RELAY OR FUSE IS CONNECTED TO THE WIRE tested continuity of terminal the from the fuse box white m/plug to the ECU conn is ok,,,,,,,,,,,IT appears not to use this wire to supply the ign +12v to the ecu ???any thoughts ??? as a note on this I found that ECU is supplied with IGN +12V on the following pins PIN 8 and on PIN 43 (This pin is supplied by the immobiliser circuit and works ok)
I am trying to test the all the I/O's to the ECU before condemning the ecu !! found surface corrosion the ally housing but pins are clean and no sign of water ingress when took the casing off for inspection .
Sorry about the long post : )
Any tips or guidance on this would be much appreciated.
Regards
Derrick
11-11-2008, 03:48 AM
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Re: 2.5 AUDI PETROL 5cyl SIEMENS SIMOS NO HT !!
We over haulled our 2.3 aar engine had a spark problem.also thought ecu was bust, eventually traced it to an earth braid that was not connected next to the distributor.. So just check all Neg earth braids and cleanliness on connections to engine and body.. hope this helps
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