P0106
DTC P0106 MAP System Performance
Circuit Description
The Manifold Absolute Pressure (MAP) sensor is mounted in the intake manifold. The MAP sensor measures pressure changes within the intake manifold which is an indication of engine load. The MAP sensor has a 5.0 volt reference, a ground, and a signal circuit. When the manifold pressure is low (high vacuum) the sensor output voltage is low. When the manifold pressure is high (low vacuum) the sensor output voltage is high.
The MAP sensor voltage (depending on altitude) can range from 1.0 - 1.5 volts at idle (high vacuum) to 4.0 - 4.9 volts at wide open throttle (low vacuum).
This DTC is designed to detect MAP signal voltages lower than possible in a normally operating map sensor.
Conditions for Running the DTC
- No active TP sensor DTCs
- No active EGR DTCs
- Any variation in engine speed is less than 75 RPM
- Any variation is throttle position is less than 1.5%
- Any variation in idle air is less than 4 steps
- The change in EGR flow rate is less than 2%
- No change in brake switch status
- No change in the clutch status (manual transmission)
- No change in AC clutch status for 2 seconds
- The engine speed is between 400 - 5000 RPM
Conditions for Setting the DTC
The MAP voltage is outside acceptable limits for more than 24 seconds
Action Taken When the DTC Sets
- The VCM illuminates the MIL (Malfunction Indicator Lamp) if a failure is detected during 2 consecutive key cycles.
- The VCM will set the DTC and records the operating conditions at the time the diagnostic fails. The VCM stores the failure information in the scan tools Freeze Frame and/or the Failure Records.
Conditions for Clearing the MIL/DTC
- The VCM turns OFF the MIL after 3 consecutive drive trips when the test has Run and Passed.
- A history DTC will clear if no fault conditions have been detected for 40 warm-up cycles (coolant temperature has risen 22 °C (40 °F) from the startup coolant temperature and the engine coolant temperature is more than 70 °C (158 °F) during the same ignition cycle).
- Use the scan tool Clear Information function.
Diagnostic Aids
Check the MAP sensor vacuum source for leaks, restrictions or poor connections.
IMPORTANT: The electrical connector must remain securely fastened.
IMPORTANT: After removing the MAP Sensor from the intake manifold, replace the MAP Sensor to intake manifold seal
Disconnect the MAP Sensor from the intake manifold and gently twist the sensor in order to check for intermittent connections. Output changes greater than 0.1 volt indicate a bad connector or connection.
An intermittent may be caused by any of the following conditions:
- A poor connection
- Rubbed through wire insulation
- A broken wire inside the insulation
Thoroughly check any circuitry that is suspected of causing the intermittent complaint. Refer to Intermittents and Poor Connections Diagnosis.
If a repair is necessary, then refer to Wiring Repairs or Connector Repairs.
Steps 1 - 2:
Steps 3 - 6:
Steps 7 - 10:
Test Description
The numbers below refer to the step numbers on the diagnostic table.
2. This step checks the MAP sensor's ability to correctly indicate barometric pressure.
In order to determine the correct MAP sensor display of barometric pressure for any elevation perform either of the following:
1. Compare the recorded MAP sensor display value to the BARO display on a known good vehicle.
2. Obtain the local weather service barometer reading (in. Hg). Multiply the barometer reading by 3.4. The result indicates the correct BARO value for your area.
3. This step checks the MAP sensor's ability to correctly indicate engine vacuum. The MAP sensor display is only active while the engine is operating.