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I have a low voltage condition on the Map sensor 2002 Pontiac Montana.

WHere can i get wiring schematic for map sensor?

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I have a 2005 gmc envoy xl 2ith inline 6 motoer. It keeps telling me p0105 mass absolute pressure sensor is bad but i got a new one and that did not fix problem. Could it be the pigtail wires? They look...


What did you use to read this code with ? No P0105 code for this vehicle .
--------------------------------------------------------------------------------
DTC P0106
The manifold absolute pressure (MAP) sensor responds to pressure changes in the intake manifold. The pressure changes occur based on the engine load. The MAP sensor has the following circuits:
• A 5-volt reference circuit
• A low reference circuit
• A MAP sensor signal circuit

The powertrain control module (PCM) supplies 5 volts to the MAP sensor on the 5-volt reference circuit. The PCM also provides a ground on the low reference circuit. The MAP sensor provides a signal to the PCM on the MAP sensor signal circuit which is relative to the pressure changes in the manifold. The PCM should detect a low signal voltage at a low MAP, such as during an idle or a deceleration. The PCM should detect a high signal voltage at a high MAP, such as the ignition is ON, with the engine OFF, or at a wide-open throttle (WOT). The MAP sensor is also used in order to determine the barometric pressure (BARO). This occurs when the ignition switch is turned ON, with the engine OFF. The BARO reading may also be updated whenever the engine is operated at WOT. The PCM monitors the MAP sensor signal for voltage outside of the normal range.
The PCM calculates a predicted value for the MAP sensor based on throttle position (TP) and engine speed. The PCM then compares the predicted value to the actual MAP sensor signal. If the PCM detects that the MAP sensor signal is not within the predicted range, DTC P0106 sets.

Inspect for the following conditions:
• Disconnected, damaged, or incorrectly routed vacuum hoses
• Missing or damaged manifold absolute pressure (MAP) sensor seal
• Restrictions in the MAP sensor vacuum source
• Intake manifold vacuum leaks
Did you find and correct the condition?

This code does not tell U the MAP sensor is bad , do yourself a favor an take it to a qualified repair shop.

May 20, 2018 | GMC Cars & Trucks

2 Answers

In my 2005 Pontiac Montana the OBD code reader reads code PO108 - Manifold absolute pressure sensor circuit, high input. What can cause this.


The PCM detects that the MAP sensor voltage is more than 4.3 volts for 3 seconds.
This DTC may set due to poor idle characteristics. A possible cause may be uncontrolled fueling due to an open or high resistance in the HO2S 1 low signal circuit. Before replacing any component, ensure that this condition does not exist.
2
Turn ON the ignition, with the engine OFF.
Monitor the DTC information with the scan tool.
Is DTC P0641 also set?
--
YES - Go to Diagnostic Trouble Code (DTC) List - Vehicle
NO - Go to Step 3
3
Observe the throttle position (TP) sensor parameter with the scan tool.
Press the accelerator pedal slowly until the throttle is in the wide open position.
Release the accelerator pedal slowly until the throttle is returned to the closed position.
Repeat this procedure several times.
Does the TP sensor parameter increase steadily to more than the first specified value, and then decrease steadily returning to less than the second specified value?
98%
1%
YES - Go to Step 4
NO _ Go to DTC P0121
4
Start the engine.
Observe the MAP sensor parameter with a scan tool.
Is the voltage more than the specified value?
4.3 V
YES - Go to Step 6
NO - Go to Step 5

Jan 27, 2017 | 2005 Pontiac Montana

1 Answer

Smog code p0108


this is for the MAP sensor , it can also be a wiring fault and not the actual sensor so i've copied and pasted to save time a guide
Symptoms Possible sumptoms of OBD code P0108
MIL (Malfunction Indicator Lamp) will likely be on Engine may run poorly Engine may not run at all Fuel mileage may decrease Presence of black smoke at exhaust
Causes Possible causes of OBD code P0108
Bad MAP sensor Leak in vacuum supply line to MAP sensor Engine vacuum leak Short on signal wire to PCM Short on reference voltage wire from PCM Open in ground circuit to MAP Worn engine causing low vacuum
Possible Solutions A good way to diagnose if the MAP sensor is to blame would be to compare the KOEO (key on engine off) MAP sensor reading on a scan tool with the Barometric pressure reading. They should be the same because they both measure atmospheric pressure. If the MAP reading is greater than 0.5 volt off of the BARO reading, then replacing the MAP sensor would likely fix the problem. Otherwise, start the engine and observe the MAP reading at idle. It should normally be about 1.5 volts (varies according to altitude). a. If it is, the problem is likely intermittent. Check all the vacuum hoses for damage and replace as necessary. You can also try wiggle testing the harness and connector to reproduce the problem. b. If the scan tool MAP reading is more than 4.5 volts, check the actual engine vacuum reading with the engine running. If it is less than 15 or 16 in. Hg, then the PCM is probably not seeing enough vacuum (due to a worn engine, perhaps) for a given operating condition (which causes a higher than normal voltage signal to the PCM) and setting the code. Repair the engine vacuum problem and retest. c. But, if the actual engine vacuum reading is 16 in. Hg or more, then unplug the MAP sensor. The scan tool MAP reading should indicate that there is no voltage present. Check that the ground from the PCM is intact and also that the MAP sensor connector and terminals are tight. If the connection is good, then replace the map sensor. d. However if, with KOEO, & the MAP sensor unplugged, the scan tool shows a voltage reading, then there may be a short in the harness to the MAP sensor. Turn the ignition off. At the PCM unplug connector and remove the MAP signal wire from the connector. Re-attach the PCM connector and see if with KOEO, the scan tool MAP reading shows voltage. If it still does, replace the PCM. If not, check for voltage on the signal wire you just removed from the PCM. If there is voltage on the signal wire, find the short in the harness and repair.

hope this helps

Jul 08, 2014 | 2001 Pontiac Sunfire

1 Answer

2002 jeep map sensor problems


Not exactly sure what you're describing. Incorrect voltage to or from Map sensor? Map sensors are very sensitive. I clean mine with a Map Sensor Spray cleaner every time I change the Air filter. Check to see if the fine, almost hair like wires in the Map sensor are broken...replace and/or clean if necessary. Best of luck resolving this problem.

Mar 31, 2014 | 2002 Jeep Grand Cherokee

1 Answer

What is the most likely problem if my 2006 Pontiac torrent is reading code p0107?


Diagnostic Test Code (DTC) P0107 has a generic description of "Manifold Absolute Pressure (MAP) Sensor Circuit Low".

I do not have the time or space to describe the entire function of the circuit or what it is used for, but the basic reason that this code sets is when the Powertrain Control Module (PCM) detects that the MAP sensor voltage is less than 0.1 volt for more than 3 seconds. The monitor for this DTC runs continuously any time the ignition switch is in the ON or RUN position.

The actual REASON the voltage is low must be properly diagnosed. It could be from a defective MAP sensor. However, MAP sensor failures on these vehicles are pretty rare. A MORE LIKELY cause of this condition would be loose or corroded electrical connectors or wiring harness damage.

I have fixed several of these by repairing damage caused by rodents getting into the engine compartment and chewing on the wiring harnesses. Then, I have fixed at least as many by cleaning the connectors at the PCM and applying dielectric grease to the connector pins. I cannot remember the last time I had to replace the MAP sensor itself on ANY GM vehicle. I know that I have in the past, but it has been a long time ago.

At any rate, you will need a scan tool that can read live engine data so you can monitor the data for the MAP sensor and verify whether this is a current or intermittent fault. If it is current, it will be much easier to locate the fault. If it is intermittent, one must go through all of the procedures to try and reproduce the fault so it can be tracked down and repaired.

Dec 13, 2011 | 2006 Pontiac Torrent

1 Answer

Ran an ecu fault code reader on my focus and it shows up beromatric low presure what is this ?


Hi there,

If you are correct with your code reader, this condition should trigger fault code: P0107.

This relates to your MAP/BARO Sensor's signal voltage is too low (below 0.25v).

This condition will cause all sorts of engine running issues....

First, using your scan tool with the Key on and engine running, monitor the MAP Sensor voltage. If it is reading less than 5 volts, turn engine off, unplug the MAP sensor and, using a DVOM (Digital Volt/Ohm Meter) check for 5Volts on the 5 Volt reference circuit.


1. If there is not 5 Volts on the reference circuit, then check for the reference voltage at the PCM connector. If it is present at the PCM connector but not the MAP connector, repair the open in the wiring loom between the PCM and MAP harness connector.


If 5 Volt reference is NOT present at the PCM connector, check powers and grounds of PCM and repair/replace as needed.


2. If you have a 5 Volt reference at the MAP connector, jumper the 5 volt reference circuit to the signal circuit. Now check the MAP voltage on the scan tool. It should be 4.5 to 5 Volts. If it is, replace MAP sensor. If not, repair open/short in the signal circuit wiring and re-check.


3. If all appears okay, perform a wiggle test. Start engine and manipulate the harness, connector and tap on the MAP sensor. Note any changes in voltage or engine speed. Repair connector, harness, or sensor as needed.


4. If the wiggle test checks out, use a vacuum pump (or just use your lungs) to draw a vacuum on the MAP sensor vacuum port. As you add vacuum the voltage should decrease. With no vacuum, the MAP sensor should read approximately 4.5 volts. If there is no change in MAP sensor reading on the scan tool, replace MAP sensor.



Cheers,

Sep 05, 2011 | 2001 Ford Focus

1 Answer

95 cadillac reading code current p105 sometimes engine light comes on sometimes harder to start than normal, idles up and down up on stopping


Symptoms Symptoms of a P0105 check engine light code may include:
  • Poor running engine
  • Engine runs rich
  • Engine won't idle
  • Engine backfires through tailpipe
  • Engine misfire under load or at idle
  • MIL (Malfunction Indicator Lamp) illumination
  • In some extreme cases there may be no symptoms other than MIL illumination
Causes A P0105 DTC could be caused by:
  • MAP sensor vacuum hose disconnected or plugged
  • Bad MAP Sensor
  • Bad TPS
  • Damaged or problematic MAP sensor connector
  • Damaged or problematic TPS connector
  • Damaged wiring
  • Short to reference voltage on signal circuit of MAP Sensor
  • Loss of ground to MAP sensor or TPS
  • Open on signal circuit of MAP sensor
  • Bad PCM
Possible Solutions Using a scanner or code reader, turn the ignition on and engine OFF; what does the MAP sensor voltage read? It should be about 4 Volts for sea level. If you are at a higher altitude, it should decrease about half a volt or so for each 1,000 ft. of altitude (this will vary from model to model) Or if you have a separate MAF (Mass air flow) sensor on your vehicle, they are usually equipped with a Barometric pressure reading. If so, the Baro reading should match the MAP reading (they both measure ambient air pressure). If they're roughly equal, then, check for Freeze Frame data of the MAP sensor (if available).
NOTE: Freeze Frame data is the PCM recording a fault when it happens. It captures the readings of the various PIDS (parameter identifiers)available to troubleshoot what happened. It's like a recording of the problem as it happened. At idle a typical MAP sensor Voltage reading should be about a volt, and at WOT (wide open throttle) it should approach 4.5 to 5 Volts. As for the TPS, at idle, the voltage reading is about 1 Volt or less. As the throttle is opened the reading will increase to 4.5 Volts at WOT. Do the two readings make sense? For example, if the TPS reading on Freeze Frame data shows 2.5 Volts (indicating partial throttle) does the MAP sensor indicate a reading that isn't at either extreme? Using the Freeze Frame data (if available) compare the MAP reading to the TPS when the problem occurred. This can help you identify what happened
If you have no access to Freeze Frame data then check if the MAP sensor voltage changes when you apply vacuum to it. You can do this by mouth or a vacuum pump. The voltage should increase as you apply vacuum. If the reading doesn't change as you apply vacuum, make sure there are no obstructions in the hose to the sensor. If the hose is clear, the MAP sensor is usually bad, but it doesn't rule out the following from causing the problem: Does the MAP sensor appear to be stuck at less than .5 Volts? Then:
NOTE: This code shouldn't set if the MAP is stuck at extremely low voltage, however, I'm adding it in because there's no way to know for certain for which vehicles a low voltage condition may set a P0105
  1. Inspect the wiring harness and MAP sensor connector. Repair any damage
  2. Unplug the MAP sensor connector. Also, at the PCM connector, remove the MAP sensor signal wire and check for continuity to the MAP sensor connector. If there is infinite resistance, then repair open in MAP signal circuit. If the signal wire has continuity to the MAP sensor connector, then check for 5 volt reference voltage to the connector and a good ground. If both are present, then re-install all removed wiring and replace the MAP sensor.
Does the MAP sensor appear to be stuck at full 4.5 voltage? Then:
  1. Inspect the wiring harness for damage. Repair as needed
  2. Remove the MAP sensor signal wire from the PCM connector. With a voltmeter measure the voltage with KEY ON ENGINE OFF. Is there 4.5 Volts? If so, unplug the MAP sensor and recheck. If it is still present, then repair short between the signal wire and 5 volt reference wire.
  3. If unplugging the MAP sensor causes the voltage to disappear, check that the ground is intact. If it is, then replace the MAP sensor due to internal short.

Jun 17, 2011 | 1995 Cadillac DeVille

1 Answer

Engine Code P0108. The engine revs up high and back low about 10 times before idling normally when first turned on. then there is other idling issues when accelerating to hard or at a stop. Are there...


P0108 - MAP Manifold Absolute Pressure/Barometric Pressure Circuit High Input

The MAP (Manifold Absolute Pressure) sensor measures engine manifold negative air pressure. It's usually a three wire sensor: a ground wire, a 5 volt reference wire from the PCM (Powertrain Control Module) to the MAP sensor, and a signal wire that informs the PCM of the MAP sensor voltage reading as it changes. The higher the engine vacuum, the lower the voltage reading. The voltage should range between about 1 volt (at idle) to about 5 volts (WOT wide open throttle).

If the PCM sees the voltage reading from the MAP sensor is greater than 5 Volts, or if the voltage reading is higher than what the PCM considers normal under certain circumstances, a P0108 DTC will set.


Symptoms of a P0108 DTC code may include:
* MIL (Malfunction Indicator Lamp) will likely be on
* Engine may run poorly
* Engine may not run at all
* Fuel mileage may decrease
* Presence of black smoke at exhaust


Causes: Potential causes of a P0108 code:
* Bad MAP sensor
* Leak in vacuum supply line to MAP sensor
* Engine vacuum leak
* Short on signal wire to PCM
* Short on reference voltage wire from PCM
* Open in ground circuit to MAP
* Worn engine causing low vacuum


Possible Solutions
A good way to diagnose if the MAP sensor is to blame would be to compare the KOEO (key on engine off) MAP sensor reading on a scan tool with the Barometric pressure reading. They should be the same because they both measure atmospheric pressure.

If the MAP reading is greater than 0.5 volt off of the BARO reading, then replacing the MAP sensor would likely fix the problem. Otherwise, start the engine and observe the MAP reading at idle. It should normally be about 1.5 volts (varies according to altitude).

a. If it is, the problem is likely intermittent. Check all the vacuum hoses for damage and replace as necessary. You can also try wiggle testing the harness and connector to reproduce the problem.
b. If the scan tool MAP reading is more than 4.5 volts, check the actual engine vacuum reading with the engine running. If it is less than 15 or 16 in. Hg, then the PCM is probably not seeing enough vacuum (due to a worn engine, perhaps) for a given operating condition (which causes a higher than normal voltage signal to the PCM) and setting the code. Repair the engine vacuum problem and retest.
c. But, if the actual engine vacuum reading is 16 in. Hg or more, then unplug the MAP sensor. The scan tool MAP reading should indicate that there is no voltage present. Check that the ground from the PCM is intact and also that the MAP sensor connector and terminals are tight. If the connection is good, then replace the map sensor.
d. However if, with KOEO, & the MAP sensor unplugged, the scan tool shows a voltage reading, then there may be a short in the harness to the MAP sensor. Turn the ignition off. At the PCM unplug connector and remove the MAP signal wire from the connector. Re-attach the PCM connector and see if with KOEO, the scan tool MAP reading shows voltage. If it still does, replace the PCM. If not, check for voltage on the signal wire you just removed from the PCM. If there is voltage on the signal wire, find the short in the harness and repair.


Hope helps (remember to rate this answer).

Apr 05, 2011 | 2003 Chrysler PT Cruiser

1 Answer

I have a p0105 error. They say this is a dirty body throttle. How can I clean this myself? My car is a 2002 Chevy Envoy.


DTC P0105 - Crankshaft Position Sensor B Circuit Malfunction or Manifold Absolute Pressure/Barometric Pressure Circuit Malfunction


What does that mean?
The MAP (Manifold Absolute Pressure) sensor is part of the fuel management system. It reacts to changes in engine manifold pressure. The PCM (Powertrain Control Module) monitors the MAP sensor continually to properly run the engine. Changes in engine load require changes in the amount of fuel injected, and timing of the ignition system, etc. An engine under load has more manifold pressure(or less vacuum) than an engine that is coasting. As the load changes, the MAP sensor voltage signal to the PCM changes accordingly. To check the MAP sensor operation, though, the PCM watches other sensors to verify that the MAP sensor is working properly.

For example, the PCM compares the TPS (Throttle Position Sensor) signal to the MAP signal to verify the MAP signal isn't "sticking". If the PCM doesn't see a MAP sensor change immediately follow a change in the throttle pedal sensor, it knows there is a problem with the MAP sensor and sets P0105. Or, if the PCM notices that the TPS indicates the engine is under load, but the MAP signal indicates that the engine is "coasting" it, again, knows there is a problem with the MAP sensor or TPS and sets P0105.

Symptoms: Symptoms of a P0105 check engine light code may include:
* Poor running engine
* Engine runs rich
* Engine won't idle
* Engine backfires through tailpipe
* Engine misfire under load or at idle
* MIL (Malfunction Indicator Lamp) illumination
* In some extreme cases there may be no symptoms other than MIL illumination

Causes: A P0105 DTC could be caused by:
* MAP sensor vacuum hose disconnected or plugged
* Bad MAP sensor
* Bad TPS
* Damaged or problematic MAP sensor connector
* Damaged or problematic TPS connector
* Damaged wiring
* Short to reference voltage on signal circuit of MAP sensor
* Loss of ground to MAP sensor or TPS
* Open on signal circuit of MAP sensor
* Bad PCM

Possible Solutions: Using a scanner or code reader, turn the ignition on and engine OFF; what does the MAP sensor voltage read? It should be about 4 Volts for sea level. If you are at a higher altitude, it should decrease about half a volt or so for each 1,000 ft. of altitude (this will vary from model to model) Or if you have a separate MAF (Mass air flow) sensor on your vehicle, they are usually equipped with a Barometric pressure reading. If so, the Baro reading should match the MAP reading (they both measure ambient air pressure). If they're roughly equal, then, check for Freeze Frame data of the MAP sensor (if available).

NOTE: Freeze Frame data is the PCM recording a fault when it happens. It captures the readings of the various PIDS (parameter identifiers)available to troubleshoot what happened. It's like a recording of the problem as it happened. At idle a typical MAP sensor Voltage reading should be about a volt, and at WOT (wide open throttle) it should approach 4.5 to 5 Volts. As for the TPS, at idle, the voltage reading is about 1 Volt or less. As the throttle is opened the reading will increase to 4.5 Volts at WOT. Do the two readings make sense? For example, if the TPS reading on Freeze Frame data shows 2.5 Volts (indicating partial throttle) does the MAP sensor indicate a reading that isn't at either extreme? Using the Freeze Frame data (if available) compare the MAP reading to the TPS when the problem occurred. This can help you identify what happened

If you have no access to Freeze Frame data then check if the MAP sensor voltage changes when you apply vacuum to it. You can do this by mouth or a vacuum pump. The voltage should increase as you apply vacuum. If the reading doesn't change as you apply vacuum, make sure there are no obstructions in the hose to the sensor. If the hose is clear, the MAP sensor is usually bad, but it doesn't rule out the following from causing the problem: Does the MAP sensor appear to be stuck at less than .5 Volts? Then:

NOTE: This code shouldn't set if the MAP is stuck at extremely low voltage, however, I'm adding it in because there's no way to know for certain for which vehicles a low voltage condition may set a P0105.

1. Inspect the wiring harness and MAP sensor connector. Repair any damage
2. Unplug the MAP sensor connector. Also, at the PCM connector, remove the MAP sensor signal wire and check for continuity to the MAP sensor connector. If there is infinite resistance, then repair open in MAP signal circuit. If the signal wire has continuity to the MAP sensor connector, then check for 5 volt reference voltage to the connector and a good ground. If both are present, then re-install all removed wiring and replace the MAP sensor.

Does the MAP sensor appear to be stuck at full 4.5 voltage? Then:

1. Inspect the wiring harness for damage. Repair as needed
2. Remove the MAP sensor signal wire from the PCM connector. With a voltmeter measure the voltage with KEY ON ENGINE OFF. Is there 4.5 Volts? If so, unplug the MAP sensor and recheck. If it is still present, then repair short between the signal wire and 5 volt reference wire.
3. If unplugging the MAP sensor causes the voltage to disappear, check that the ground is intact. If it is, then replace the MAP sensor due to internal short.

MAP sensor codes include P0105, P0106, P0107, P0108 and P0109 .


Hope helps (remember rated this).

Jul 09, 2010 | 2002 GMC Envoy

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