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Your checking for generic codes only & throwing
parts at it
You get a couple possible worn or failed parts & have
a few less codes
There is no need to clear ALL Data every time you change a part
You need to STOP
You need professional scan tool software to look at ALL data & go for a road test first
You keep clearing stored data ,so now the process will take longer
You work one code & one system at a time
NO PARTS get replaced that are not tested & found to fail
a test,thus a worn out part.
You need both Factory Emission & Diagnostic Manual, as well
as Wiring Diagram Book-- BEFORE-- you can even walk to the vehicle (Helm.Com)
You have nothing to go by,no system knowledge & no trouble charts,& no wiring diagrams to start your testing
If you got no scan tool & no volt meter & no oscilloscope,
your done,vehicles have to be tested to find a problem,any
problem,resolve it & continue on.
P1296 No 5-Volts to MAP Sensor
P0108 MAP Sensor Voltage Too High
P0500 No Vehicle Speed Signal Circuit
P1494 Leak Detection Pump Switch or Mechanical Faul
I would try MAP sensor first.
Fisrt, make sure your gas cap is tight. You can get a code with a
loose gas cap. Tighten it, disconnect/reconnect batery, and then wait a
few trips to see if the code clears.
If its not that, you may have a leak in your system.
P1494 is the code for the leak detection pump and or system, which is part of the early evaporative emission system. (Fuel tank fumes) It’s there to allow the computer to run an integrity test of the fuel tank, lines and carbon canister’s ability to contain all of the fumes coming from the tank and all line associated with the system. The code could be set for a number of reasons such as a faulty gas cap, cracked vacuum lines, solenoids & vent valves stuck to the pump itself. It can be a very difficult fault to cure being it doesn’t take a very big leak anywhere in the system to set the code and that’s if it’s a leak and not an electrical or mechanical fault.
The code refers to the leak detection pump that is part of the gasoline vapor control system which is for pollution minimization. It says either that the pump switch or mechanical operation is faulty. I had this happen on a 2000 Dodge Dakota and a replacement Gas Cap fixed the problem. A faulty gas cap seal can also cause this.
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