- mån 05 apr 2010, 22:13
#396615
Ok a fast copy paste of the trace when checking for troublecodes in the ECM
First the tester sends keep alive packages with ID "FFFFEx" with data "D8 00 00 00 00 00 00 00"
Then I request DTC from ECM(petrol) the tester sends the following data, where "7A AE 11" is the request. I am not certain of what "CB" stands for, but it could be the length of the message somehow.
ID = FFFFEx
Data = CB 7A AE 11 00 00 00 00
The ECM answers with its unique ID for tester response, (here I have 2 DTC set)
ID = 800021x
Data = CF 7A EE 11 91 2A 26 1A
"CF" is again something uncertain.
"7A EE 11" is a response for the tester showing it is a DTC read.
91 2A = DTC (ECM-912A Engine control module (ECM) communication. Faulty signal)
26 1A = DTC (ECM-261A Long-term fuel trim)
First the tester sends keep alive packages with ID "FFFFEx" with data "D8 00 00 00 00 00 00 00"
Then I request DTC from ECM(petrol) the tester sends the following data, where "7A AE 11" is the request. I am not certain of what "CB" stands for, but it could be the length of the message somehow.
ID = FFFFEx
Data = CB 7A AE 11 00 00 00 00
The ECM answers with its unique ID for tester response, (here I have 2 DTC set)
ID = 800021x
Data = CF 7A EE 11 91 2A 26 1A
"CF" is again something uncertain.
"7A EE 11" is a response for the tester showing it is a DTC read.
91 2A = DTC (ECM-912A Engine control module (ECM) communication. Faulty signal)
26 1A = DTC (ECM-261A Long-term fuel trim)