91 vert fixed omp with a good ecu still in limp mode
04-25-11, 02:59 PM
#26
Those codes indicate that the TPS is shot (12 and 18) and that the OMP is shot (27)
It could just be the ECU though. Get another ECU from a s5 non-turbo and see. If you need another OMP, I happen to have one from my old s5 that I can give you.
Get a multimeter and probe the related pins for the TPS and the OMP at the ECU and compare the results with the FSM. If they are out of spec I would once again suspect the ECU is shot.
It could just be the ECU though. Get another ECU from a s5 non-turbo and see. If you need another OMP, I happen to have one from my old s5 that I can give you.
Get a multimeter and probe the related pins for the TPS and the OMP at the ECU and compare the results with the FSM. If they are out of spec I would once again suspect the ECU is shot.
04-25-11, 05:24 PM
#27
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04-25-11, 09:06 PM
#28
Don't keep plugging 'Good' ecu's into a bad MOP. You'll be sorry sooner or later.
Here is THE definitive thread on the situation in the entire forum.
https://www.rx7club.com/2nd-generation-specific-1986-1992-17/s5-mop-ecu-failure-diagnosis-710938/
Please read the entire thread. This has all your answers.
Try testing the MOP. This testing protocol includes the FSM tests and extended tests. There is usually in internal short between the MOP coils that allows a reduced resistance to the output current from the ECU. This reduced resistance causes increased current which burns the circuits in the ECU.
You can have an MOP that passes the FSM tests yet still take out your ECU.
Here is THE definitive thread on the situation in the entire forum.
https://www.rx7club.com/2nd-generation-specific-1986-1992-17/s5-mop-ecu-failure-diagnosis-710938/
Please read the entire thread. This has all your answers.
Try testing the MOP. This testing protocol includes the FSM tests and extended tests. There is usually in internal short between the MOP coils that allows a reduced resistance to the output current from the ECU. This reduced resistance causes increased current which burns the circuits in the ECU.
You can have an MOP that passes the FSM tests yet still take out your ECU.
I had some input regarding the MOP electrical testing that I described before. In order to clear things up and make a useful tool. I created the table below with all the measurements and expected values for anyone's use. It is complete and will not lead you down the wrong path like the 1990 FSM.
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trickster
2nd Generation Specific (1986-1992)
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07-01-23 04:40 PM
