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Originally Posted by Brian R.
You should be able to access it directly from underneath the car.
Did you test your MAP sensor?
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Re: Map sensor testing
This afternoon i tried testing the MAP sensor. As i was following the steps in my Haynes manual, I realized that i didn't know what backprobing was. Although i do have a handheld vacum pump, i don't know how to backprobe. So I couldn't get past step one.
Step 1: I checked the reference voltage fro the PCM to the MAP sensor. It read: off=0 V, on (with engine not running)=4.98V.
Step 2: The next step says to check the MAP signal voltage under simulated operating conditions. Reconnect the MAP sensor electrical connector and, using a voltmeter and suitable probes, backprobe connector terminal number 2 with the positive probe and terminal number 1 with the negative probe. Disconnect the vacuum hose at the sensor and connect a hand-held vacuum pump to the sensor. Turn the ignition key to ON (engine not running).
QUESTION: How do i backprobe when the connector is connected to the harness?? Am i supposed to be using some kind of wire?
Step 3: Apply vacuum to the sensor and verify the voltage from the signal wire increases as the vacuum increases (reference the voltage reading table)