P0106 - MAP/Barometric Pressure Circuit Range/Performance Problem

Description and meaning of DTC p0106

This diagnostic trouble code (DTC) is a generic powertrain code, which means that it applies to OBD-II equipped vehicles. Although generic, the specific repair steps may vary depending on make/model. 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 nothave a MAP sensor. Other vehicles have a MAF/BARO and a redundant MAPsensor where the MAP sensor functions as a backup input in case of MAF failure. The PCM supplies a 5 Volt reference signal to the MAPsensor. Usually the PCM also supplies a ground circuit to the MAP sensoras well. As the manifold pressure changes with load, the MAPsensor input informs the PCM. At idle the voltage should be 1 to 1. 5 Voltsand approximately 4. 5 Volts at Wide Open Throttle (WOT). The PCM looks for anychange in manifold pressure to be preceded by a change in engine load in theform 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 detectinga rapid change in MAP value, it will set a P0106.

p0106 diagnostic trouble code 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

DTC p0106 - possible causes

A P0106 could be caused by: Bad MAP sensor Water/dirt intrusion affecting MAP sensorconnector Intermittent open in the reference, ground, or signal wire for the MAPsensor Intermittent short in the reference, ground, or signal wire for the MAPsensor Ground problem due to corrosion causing intermittent signal problemA 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 otherpossibilities)

How to fix OBD-II diagnostic trouble code p0106

Using a scan tool, watch the MAP sensor valuewith 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 sensorvoltage indicating the MAP sensor is working. If the MAP reading doesn't change perform the following: 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 voltagedrop? It should. If it doesn't inspect the MAP sensor vacuum port and vacuumhose to manifold for a restriction of some kind. Repair or replace as necessary. 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 sensorunplugged, check for 5 Volts at the reference wire to the MAP sensor connectorwith a Digital Voltmeter. If there is none, check for reference voltage atthe PCM connector. If the reference voltage is present at the PCM connectorbut not the MAP connector, check for open or short in the reference wire betweenMAP and PCM and retest. If reference voltage is present, then check for existing ground at the MAPsensor connector. If it isn't present then repair open/short in the groundcircuit. If ground is present, then replace MAP sensor. Other MAP sensor trouble codes include P0105, P0107, P0108 and P0109.

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