Question about 1994 Pontiac Sunbird

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How do i find the map sensor and the throttle position sensor and how do i replace them and can these be tested to see if they are good or bad

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Yes you can test if you have a DVOM.how do i find the - bonedivers_22.gif

Posted on May 20, 2011

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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

0900c15280070d99-jnh1p0frnkt3q2fbcpfimq4v-1-4.gif


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


0900c15280070d9c-jnh1p0frnkt3q2fbcpfimq4v-1-8.gif

Aug 13, 2017 | Dodge Cars & Trucks

2 Answers

I have a jeep grand cherokee i have a code p1296. voltage missing at throttle position sensor.explanation engine running and the ecm detected map sensor voltage less than expected. probable cause open or...


I would change the TPS throttle position sensor and the Map/MAF are you sure its not the mass air flow?. I think your computer is fine it could be have a loose ground issues but computers dont go bad.

Sep 12, 2011 | 1997 Jeep Grand Cherokee

1 Answer

When i punch on the gass my 97 tahoe hesitates


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.



jturcotte_512.jpg

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


jturcotte_513.jpg

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


jturcotte_1792.gif

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.



jturcotte_514.jpg

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


jturcotte_515.jpg

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


jturcotte_1793.gif

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

May 30, 2011 | Chevrolet Tahoe Cars & Trucks

2 Answers

2002 Saturn SL1 will not start. Has spark, good battery and gas. Just had an oil, fuel and air filter change and cranks great. Any ideas?


What your telling us, doesn't indicate a problem

If you have air,fuel & spark,how were they tested ?

Mar 30, 2011 | 2002 Saturn Sl

1 Answer

Driving along, and then just lose all power, like someone shut the key off


Hello! One of two sensors are defective..#1....The Manifold Absolute Pressure (MAP) sensor which is bolted to the throttle body...#2 the Throttle Positioning Sensor (TPS), also bolted to the throttle body...They can be tested with a volt meter...I would need the engine size in order to send test procedures...The most likely culprit is the MAP...If you do not feel comfortable testing or you do not have a meter...Check the connector on the MAP for corroded pins and broken wires... Wire colors are...Black/White...Dark Blue/Light Green...And Orange/White...If OK, replace the MAP...Cost (3 different sensors based on engine size)...Cost is around $35 for each...


Guru...Saailer

Jan 14, 2011 | 1988 Ford F 350

1 Answer

Didnt pass smog i replaced catalytic converter,02 ...


Have a code test done (most larger parts stores do that free) In some cases you may need a shop to put a scanner on it to find specific out of range sensors that may not yet be bad enough to set a code.
I'd also check all vacuum lines and line connections as a small leak can alter the system readings. All the sensors on your car work together and the computer reacts to all the information it receives... Bad info in, bad info out...Only good testing will find the problem.
Primary sensors to pay attention to are the coolant temp sender, MAP sensor, throttle position sensor, manifold air temp sender, mass air flow sensor (if you have one) and the egr valve.and pcv valve (if you have them)
Good testing involves using a digital multi-meter and using instructions for that in chilton or haynes manuals. Replacing parts without testing can get really expensive. (but you have already found that out)
Good luck!

May 20, 2010 | Cars & Trucks

2 Answers

Need to know how to test MAP sensor


the computer will give a code if its bad
the codes related to the map sensor is PC0106,0107,0108

Feb 28, 2010 | 1990 Ford Bronco II

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

1 Answer

Specs for throttle position sensor and map sensor


OBD 1 SCANNER WOULD BE THE BEST WAY TO CHECK TPS AND MAP SENSORS.BECAUSE IF THEY ARE BAD THE SCANNER WILL GIVE YOU CODE.

Jan 01, 2010 | 1989 Chevrolet Celebrity

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