![]() If it doesn’t inspect the MAP sensor vacuum port and vacuum hose to manifold for a restriction of some kind. If there are no restrictions, and the value doesn’t change with vacuum, then perform the following: with the Key on and engine off and the MAP sensor unplugged, check for 5 Volts at the reference wire to the MAP sensor connector with a Digital Voltmeter. If there is none, check for reference voltage at the PCM connector. If the reference voltage is present at the PCM connector but not the MAP connector, check for open or short in the reference wire between MAP and PCM and retest. If reference voltage is present, then check for existing ground at the MAP sensor connector. If it isn’t present then repair open/short in the ground circuit. ![]() If ground is present, then replace MAP sensor.
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