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Freeburg IL | Have an 8400 that intermitently shows no oil pressure. Power seems to be lost to the gauge cluster, but only occationaly. No codes. Also looses engine RPM input occationally, but not at the same time as the gauge cluster. That shows a code for "no engine speed input" Ideas? |
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South Central Wisconsin | Loose engine harness connector? I think both of those sensors go through one common connector. |
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Ayr Queensland Australia 4807 | Replace the 2 x V1 diodes for a start they are near the fuses and relays |
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Freeburg IL | I replaced the two diodes and no improvement. Now I have a loss of engine speed input, and oil pressure reading. I swapped the engine speed sensor from another tractor and the problem didn't follow it. Still no codes. It won't come out of park with no engine speed input. ideas? |
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Ayr Queensland Australia 4807 | The engine speed signal is sent from the ECU to the VCU there is test that can be done to test the ECU output to the VCU we had one recently which required a VCU replacement keep in mind if you replace the VCU update it to a 40 KMH if you only have 30 kmh and depending on your machine serial number there is a kit to make the transmission shift a little better. However there is a test procedure before you start buying bits wiring splice is one issue up the front. See how you go. Let me know if you need anymore help
Edited by KelB 6/8/2017 18:22
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| I have one doing same thing . Did u get your fixed . |
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John Deere 8400
