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Fit a map sensor - Vehicle Parts & Accessories

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I have a 94 Dodge ram 1500 four-wheel-drive 5.9 L the truck has no power the transmission shifts at the wrong time and jugs on the freeway

Test the map and tps. If the throttle is controlled electronically, also test the accelerator position sensor. Make sure the tps signal changes smoothly as the throttle is opened.

Manifold Absolute Pressure (MAP) Sensor
OPERATION The Manifold Absolute Pressure (MAP) sensor is a device which monitors manifold vacuum. It is either mounted on the firewall or throttle body and is linked electrically to the on-board computer. The MAP transmits information on manifold vacuum conditions to the computer. This data determines engine load and is used with data from other sensors to adjust the air/fuel mixture.
On the 2.5L engine, the MAP sensor is mounted in the right rear side of the engine compartment. It is connected to the throttle body by vacuum line. The MAP sensor on V6 and V8 engines is mounted to the throttle body. It is connected by an L-shaped rubber fitting. The V10 MAP sensor is found on the right side of the intake manifold and senses vacuum in the manifold.
TESTING See Figure 1
To completely test this sensor and its circuitry, you will need a DRBII scan tool, or equivalent. This is a test of the MAP sensor only. This test is for all engines except the 4-cylinder.
On the V6 and V8 engines: inspect the rubber fitting from the MAP sensor to the throttle body. Repair if necessary.On the V6 and V8 engines: test the MAP sensor output voltage at the connector between terminals A and B (see drawing). With the ignition ONand the engine OFF , the output voltage should be 4-5 volts.Test the engine controller terminal No. 1 for the same voltage to confirm that the wiring is in good shape. Repair if necessary.Test the MAP sensor voltage at the sensor connector between terminals A and C with the ignition ON . The voltage should be 4.5-5.5 volts. Also check terminal No. 6 of the engine controller wiring harness for the same voltage. Repair or replace the wiring as necessary.Test the engine controller pin-1 for the same voltage to verify the wire harness condition.
0900c15280070d92-jnh1p0frnkt3q2fbcpfimq4v-1-1.gif Fig. 1: Terminal connections for testing the MAP sensor

Throttle Position Sensor (TPS)
The Throttle Position Sensor (TPS) is located on the throttle body and tells the computer when the engine is at idle, off-idle, or at Wide-Open Throttle (WOT). At idle, the computer cancels the spark advance. Idle speed is computer-controlled through the automatic idle speed motor.
TESTING To completely test this sensor and circuitry, you need the DRBII scan tool, or equivalent. This is a test of the sensor only. This test applies only to V6, V8 and V10 engines.
This test requires a digital voltmeter. The sensor must be checked on the vehicle with its 3-wire connector engaged to the sensor. The center terminal wire of the sensor connector is the output terminal.
Remove the air cleaner housing.Attach the positive lead of the voltmeter to the center terminal of the sensor harness.Attach the negative lead of the voltmeter to a good ground.With the ignition key in the ON position and engine not running, check the sensor output voltage at the center terminal wire of the connector. Check this at idle (throttle plate closed) and at Wide Open Throttle (WOT). At idle, the sensor output voltage should be greater than 200 millivolts. At WOT, the sensor output voltage should be less than 4.8 volts. The output voltage should increase gradually as the throttle plate is slowly opened from idle to WOT.If the sensor does not meet specifications, replace it.

Fig. 1: Common TPS mounting-V6 and V8 engines


Fig. Fig. 2: Common TPS mounting-V10 engine


Aug 13, 2017 | Dodge Cars & Trucks

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Fuel mixture is wrong..not running correctly. however if i unplug the MAP sensor it runs perfectly fine. I know for a fact that any of 3 things could be wrong how do i determine which sensor is bad?

I fit runs good, gets decent gas mileage, and you don't have inspections. Unplug the MAP. It could be just the MAP sensor, could be the ECU. You might get a MAP sensor, good luck on getting an ECU.

Jun 28, 2016 | 1993 Toyota Tercel

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Qhere do i find the coolant temp sensor an the map swnsor

Jaguar Sensor, XJ6, XJ8, XJS, XK8, S-TYPE, X-TYPE, XJ40 ...

Sep 25, 2015 | Cars & Trucks

1 Answer

How to fit a map sensor on vauxhall astra

Buy a new one; they are not repairable.

Jul 07, 2015 | Vehicle Parts & Accessories

1 Answer

Engine management fault fitted map sensor and still wont start

Check that the hose for the MAP sensor is not disconnected or blocked. Then check that the vacuum port for the hose is clear on the engine side. After that, start looking at a shorted wire.

May 23, 2014 | Cars & Trucks

1 Answer


A P0106 could be caused by:
Bad MAP sensor
Water/dirt intrusion affecting MAP sensor connector
Intermittent open in the reference, ground, or signal wire for the MAP sensor
Intermittent short in the reference, ground, or signal wire for the MAP sensor
Ground problem due to corrosion causing intermittent signal problem
A break in the flexible air intake duct between the MAF and the intake manifold
Bad PCM (do not assume the PCM is bad until you've exhausted all other possibilities)

Mb Star C3 Pro with seven cable Fit all computer For BENZ Truck and Cars 2012.09

Dec 14, 2012 | 2011 Infiniti M37

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How do I change the MAP sensor on a 96 Toyota Camry?

Hi Amviergever,
The map sensor is a small unit fitted onto the bulk head fire wall (The panel which separated the passenger compartment from the engine compartment)....Its fitted about one meter from the identification plate. The map sensor is fitted in place by a ten millimeter bolt....It has a thin rubber vacuum pipe fitted underneath (about six millimeter outside diameter) and the other end is attached to the surge tank (which is the cylindrical casting on top of the intake manifold. The mapping sensor also has a small electrical connector. Pull off the pipe, disconnect the electrical connection and remove the bolt....Fit new unit....Bolt plug and electrics....To delete fault code from the memory of the computer, remove the EFI fuse from the fuse holder for about ten fifteen minutes and then replace. That's it.
Regards Johngee10

Feb 07, 2011 | Toyota Camry Cars & Trucks

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Check engine light came on and is giving codes P0171,P0106,P0172,P2188, P2187. What do these mean?

check for a broken vacuum hose or vacuum fitting(s). you can use a can of spray carb cleaner. while running the engine use the spray to test hoses and fittings. give a little squirt to suspected areas. The idle speed will change when you find a vacuum leak. pay particular attention to the hose to the MAP sensor. There may be a problem with the elelctrical connection to the map sensor, or the sensor itself may be bad.

Manifold Absolute Pressure Sensor printpage_icon.gif


Oct 22, 2010 | 2006 Chevrolet Aveo

1 Answer


try reseting the immobiliser/alarm or fitting new bateries to the remotes then reseting as a first step.(i am assuming you disconnected the battery to fit map sensor)

Jun 14, 2010 | 2001 Chrysler Town & Country

1 Answer

Have a 97 dodge 318 plugs flood as soo as you try

check your coolant temp sensor. possible map sensor.
The MAP sensor is fitted to the front of the throttle body except on 4.7L and 8.0L engines where it is installed on the intake manifold.
  1. Remove the air cleaner assembly.
  2. On throttle-body mounted MAP sensors, inspect the L-shaped tube from the throttle body to the MAP for cracks, blockage, and damage. Repair as necessary.
  3. Unplug the MAP sensor connector.
  4. Test the MAP sensor output voltage at the MAP sensor connector between terminals "sensor ground" and "sensor signal". With ignition ON and the engine OFF , the voltage should be between 4-5 volts.
  5. Check voltage across the same terminals with the engine running at idle at operating temperature. Voltage should be 1.5-2.1 volts.
  6. Test MAP sensor supply voltage at sensor connector between terminals "sensor ground" and "5v supply" with the ignition ON and engine off, voltage should be 4.5-5.0 volts.
  7. Test the MAP sensor ground circuit at the "sensor ground" of the MAP connector, voltage should be less than 0.2 volts. If not inspect for open harness from pin 4 of PCM harness and terminal A . If no voltage is present, proceed to the next step.
  8. Turn the ignition OFF .
  9. Disconnect the PCM harness from the PCM.

WARNING Testing the wiring harness with the PCM still connected can cause serious damage to the processor. ALWAYS disconnect the PCM before testing the wiring harness, unless instructed otherwise.

  1. Test the MAP sensor output voltage at the PCM connector. At the PCM cavity A-27 , the voltage should be about 5.0 volts.
  2. Check the voltage at PCM cavity A-17 . It should be 5.0 volts.
  3. If all of the above tests pass, plug in PCM wiring harness and MAP sensor connector.
  4. With the ignition in the ON position, and the engine OFF , remove the tube from the throttle body to the MAP sensor.
  5. Connect a vacuum pump to the nipple on the MAP sensor, and pump the sensor to 20-27 in. Hg. Check the sensor output voltage, it should be below 1.8 volts. If not, replace the MAP sensor. If the voltage is OK, proceed to next step.
  6. Relieve vacuum pressure on the sensor, then check the output voltage. The voltage should be 4-5 volts; if not, replace the MAP sensor.
  7. Install the air cleaner assembly.

Jan 22, 2010 | 1997 Dodge Ram 1500 Club Cab

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