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P1540 Diagnostic Trouble Code Discussion for January 2010

Air Conditioning Refrigerant Over-Pressure - Air Conditioning Disabled

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Trouble Ticket Help Requests for DTC P1540
Help Request Posted
1998 Subaru Legacy Outback 2.5L MIL Lamp on VIN: 4S3BC6853W
P1540: Vehicle Speed Sensor Signal Circuit Malfunction. I replaced the heater core and had to deal with an after market alarm wiring and aftermarket radio. everything works now but the engine light is flashing and when the engine is not actually running I lose communications with the engine controller. also with ke...
January 18, 2010
1995 Mazda Millenia S 2.3L Hesitation, Surge, Cuts out VIN: JM1TA2228V
Every once in a while, it throws a code p1540 and then the rev limiter kicks in. Overboost? abv valve? My first question is, why do some of the asians use a map sensor solenoid? I have no map reading on my scanner unless I bypass the solenoid, the solenoid doe...
January 29, 2010