bw57409
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My '98 outback is doing the exact same thing yours did. Every now and again it runs rough and stalls. It throws the P0500, P1507, and P1540 codes. What did you ever find with yours? I bought a speed sensor today, but I think it may not be the problem. Can you email me at mattscott2 at gmail dot com. I will do some more looking but Hopefully you get back to me soon. Thanks in advance.
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Yes its anautomatic. The shop that did the diagnostics had the ecu and tcu out of the car to check speed sensor pins going in to both computers. That will cover reseating the ECU conectors. Will have a look at the accelerator cable however car runs ok most of the time with the stall/poor idle fault happening infrequently sometimes one per journer sometime not at all. Where is the neutral switch and what can I do to look into the idle circuit?
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My 98 Outback AWD has had the CEL on for the past month. The only symptom it has is irratic idleing and poor acceleration (may be a "get you home mode" from the ECU). However this only happens intermittently and when it does simply turning the engine off and restarting seem to clear the problem. I took it to my local garage and they carried out a diagnostic with a Snap-on Computer and the codes found were: P0500 Vehicle Speed Sensor, P1507 Idle Control System Malfunction and P1540 Speed Sensor Malfunction 2. The speedo is working ok and they found good signals from both speed sensors going into the ECU. In there words - "sensors and signals to TCM (transmission computer?) and ECM (ECU) test fine, signal from ECM drops out intermittently" Has any one heard of this type of fault? Could it be a faulty ECU or ECM if so how can this be determied prior to going to great expense on buying a new one. I am reluctant to go to a Subaru dealer from them to just start plugging in new parts to problem solve. Any advice would be appreciated.
