2000 Mazda Protege P0106 code

  • 6 CYL
  • 2WD
  • 184,000 MILES
My engine light is one. Auto Zone checks it out as a P0106 code. I have repaced the MAF sensor and the MAP sensor. I have also cleaned the EGR valve.

What else is left?
Do you
have the same problem?
Saturday, December 13th, 2008 AT 6:09 PM

2 Replies

P0106 - MAP/Barometric Pressure Circuit Range/Performance Problem

OBD-II Trouble Code Technical Description

Manifold Absolute Pressure/Barometric Pressure Circuit Range/Performance Problem

What does that mean?

The Powertrain Control Module (PCM)uses the Manifold Absolute Pressure Sensor (MAP) to monitor engine load. (NOTE: Some vehicles have a Barometric Pressure (BARO) sensor that is integral to the Mass Air Flow (MAF) sensor and do not have a MAP sensor. Other vehicles have a MAF/BARO and a redundant MAP sensor where the MAP sensor functions as a backup input in case of MAF failure.) The PCM supplies a 5 Volt reference signal to the MAP sensor. Usually the PCM also supplies a ground circuit to the MAP sensor as well. As the manifold pressure changes with load, the MAP sensor input informs the PCM. At idle the voltage should be 1 to 1.5 Volts and approximately 4.5 Volts at Wide Open Throttle (WOT). The PCM looks for any change in manifold pressure to be preceded by a change in engine load in the form of changes in throttle angle, engine speed, or Exhaust Gas Recirculation (EGR) flow. If the PCM doesn't see any of these factors change while detecting a rapid change in MAP value, it will set a P0106.

Potential Symptoms

The following could be symptomatic of a P0106:

* Engine runs rough
* Black smoke at tailpipe
* Engine will not idle
* Poor fuel economy
* Engine misses at speed


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
* Bad PCM (do not assume the PCM is bad until you've exhausted all other possibilities).

Possible Solutions

Using a scan tool, watch the MAP sensor value with the key on, engine off. Compare the BARO reading with the MAP reading. They should be roughly equal. The voltage for the MAP sensor should read approx. 4.5 volts. Now start the engine and look for a significant drop in the MAP sensor voltage indicating the MAP sensor is working.

If the MAP reading doesn't change perform the following:

1. With the Key on, engine off, disconnect the vacuum hose from the MAP sensor. Using a vacuum pump, pull 20 in. Of vacuum on the MAP sensor. Does the voltage drop? It should. If it doesn't inspect the MAP sensor vacuum port and vacuum hose to manifold for a restriction of some kind. Repair or replace as necessary.

2. If there are no restrictions, and the value doesn't change with vacuum, then perform the following: with the Key on and engine off and the MAP sensor unplugged, check for 5 Volts at the reference wire to the MAP sensor connector with a Digital Voltmeter. If there is none, check for reference voltage at the PCM connector. If the reference voltage is present at the PCM connector but not the MAP connector, check for open or short in the reference wire between MAP and PCM and retest.

3. If reference voltage is present, then check for existing ground at the MAP sensor connector. If it isn't present then repair open/short in the ground circuit.

4. If ground is present, then replace MAP sensor.

* I personally think it is a ground problem *
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Thursday, December 18th, 2008 AT 11:04 PM
I suddenly had a 106 code on my 00 protege with 1.6l engine and noticed that my engine was running rough recently. Speeding up and slowin down at idle. Noticed several 1/2inch long cracks in the tube between the air filter and engine(common problem with these cars). Sealed them with silicone and the engine runs smooth and the code hasn't come back (you can buy the tube new on line for about $25) Also changed the air filter which badly need it.
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Sunday, January 27th, 2013 AT 2:26 PM

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