Not a 99 but an 04 wiring diagram for map sensor

Question edited for full 'year make model'.
Question moved to subcategory.

https://easyautodiagnostics.com/chrysler/2.0L-2.4L/chrysler-4-wire-map-sensor-diagnostic-test-1

https://www.google.com/search?q=2001+Chrysler+PT+Cruiser+MAP+sensor+wiring+diagram

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Go to autozone and ask for the wiring diagram. They will print one for you for free. If you dont have an autozone near you try another parts store. If you purchase a haines of chiltons manual ($25 in a retail store or $18 on amazon), it will have a detailed wiring diagram of the MAP sensor.

Good Luck!

They share the engine wiring harness from the computer (called the PCM) and a common ground circuit, which is referred to as the signal return. So I think you need to look for a defective ground.

usually a bad MAP sensor or TPS. I would test both. Let me know if you have questions and provide test results for repair advice.

MAP Sensor TESTING
See Figures 3, 4 and 5

1. Backprobe with a high impedance voltmeter at MAP sensor terminals A and C.
2. With the key ON and engine off, the voltmeter reading should be approximately 5.0 volts.
3. If the voltage is not as specified, either the wiring to the MAP sensor or the ECM may be faulty. Correct any wiring or ECM faults before continuing test.
4. Backprobe with the high impotence voltmeter at MAP sensor terminals B and A.
5. Verify that the sensor voltage is approximately 0.5 volts with the engine not running (at sea level).
6. Record MAP sensor voltage with the key ON and engine off.
7. Start the vehicle.
8. Verify that the sensor voltage is greater than 1.5 volts (above the recorded reading) at idle.
9. Verify that the sensor voltage increases to approximately 4.5. volts (above the recorded reading) at Wide Open Throttle (WOT).
10. If the sensor voltage is as specified, the sensor is functioning properly.
11. If the sensor voltage is not as specified, check the sensor and the sensor vacuum source for a leak or a restriction. If no leaks or restrictions are found, the sensor may be defective and should be replaced.

Fig. Fig. 3: Location of the MAP sensor-TBI system shown

Fig. Fig. 4: Probe the terminals of the MAP sensor to check for proper reference voltage

Fig. Fig. 5: Manifold Absolute Pressure (MAP) sensor wiring diagram

TPS TESTINGSee Figures 2, 3 and 4

1. Backprobe with a high impedance voltmeter at TPS terminals A and B.
2. With the key ON and engine off, the voltmeter reading should be approximately 5.0 volts.
3. If the voltage is not as specified, either the wiring to the TPS or the ECM may be faulty. Correct any wiring or ECM faults before continuing test.
4. Backprobe with a high impedance voltmeter at terminals C and B.
5. With the key ON and engine off and the throttle closed, the TPS voltage should be approximately 0.5-1.2 volts.
6. Verify that the TPS voltage increases or decreases smoothly as the throttle is opened or closed. Make sure to open and close the throttle very slowly in order to detect any abnormalities in the TPS voltage reading.
7. If the sensor voltage is not as specified, replace the sensor.

Fig. Fig. 2: Using a DVOM, backprobe terminals A and B of the TPS sensor to check for proper reference voltage

Fig. Fig. 3: Using the DVOM, backprobe terminals C and B of the TPS sensor, open and close the throttle and make sure the voltage changes smoothly

Fig. Fig. 4: Throttle Position Sensor (TPS) wiring diagram

Okay here we go, there are three wires from the map sensor, if you look at the sensor there are letters stamped on the plug area, theres an A,B,and C the wires start from the sensor as orange/blk to terminal A then lite green wire to terminal B and last is gray wire to terminal C . im not sure what wires your freind cut but there only one at computer for map sensor and thats the signal wire, all slots at computer are numbered the signal wire is light green and connects to slot #25. heres a diagram for all wires to computer you will need to locate the wire in order to connect them back, this is not hard find the open slots and check diagram for wire color, hope this helps, good luck.

Yes it has a sensor and they are color coded however I don't think it's called a maf or map sensor that’s a GM name, there would be three wires on it on ground one 5 volts reference and one for connection to the computer to tell the computer how much air flow there is, and the reading would be from 1.5 volts to 4 volts.

one wire gos signal,5 volt, other gos 12 volt. other to ground need a wire diagram to determine which one is

check this wiring digram

http://www.bigcee.com/faq/KLR650-color-wiring-diagram.jpg


You can also buy a wiring diagram from the following site..

http://www.ahdol.com/ford_wiring_diagrams.html

Answer:

On a 3-wire MAP sensor connector when looking at the vehicle "wiring harness mating side of the connector" (and not the sensor connector) - with the snap detent pointing UP and looking LEFT to RIGHT the signals will read >

GROUND > MAP SIGNAL > POWER


Hopefully we are talking about a MAP sensor, and NOT a MAF sensor as the 2 are different as to the wiring signals.

Color of the wires doesn't matter, as you are just looking for backprobed voltage SIGNALS only using an adapter if you are doing in-circuit signal testing.

POWER I believe should be in the 5-volt range unless Jeep is using 3.3-volt.

Usually the MAP SIGNAL voltage range is quite a bit lower on the sense line, but with Jeep you never know? If using a good DVM measuring the MAP SIGNAL voltage you should see a smooth decrease in voltage as the vacuum is increased. If there is no voltage change or negative swing then the sensor may either be bad or else you have an OPEN or SHORTED wire between one of the 3 connector leads and the PCM computer, which would be rare.

I take you are troubleshooting a specific CHECK ENGINE CODE hopefully, as if not I would have the PCM read properly with a good CAN OBD II code reader to pinpoint the troublesome sensor.

I've always used an ACTRON CP9087 Sensor Tester, and a CEN-TECH 94169 CAN OBD II code reader which works great for me.

Make sure your MAP vacuum line is good and hooked up right as well.

Let me know what you find?

Thx,

Frank