P0106

Diagnostic Chart:

Wiring Diagram:

Circuit Description
The Manifold Absolute Pressure (MAP) sensor responds to changes in the intake manifold pressure (vacuum). A 5 volt reference is applied to the sensor. A variable resistor moves in relation to manifold pressure and a voltage signal is sent back to the VCM on the 5 volt reference circuit. This voltage signal varies from 1.0-1.5 volts at closed throttle to 4.0-4.5 volts at wide open throttle (low vacuum).

A substantial change in throttle position and engine speed must precede any substantial change in MAP. If a substantial change in MAP has occurred and a change in throttle position or engine speed did not precede the throttle position change, then a MAP malfunction has occurred.

The VCM utilizes the MAP signal and throttle position in order to determine the correct amount of fuel delivered to the engine. This Diagnostic Trouble Code (DTC) is a type B DTC.

Conditions for Setting the DTC

^ No TP sensor DTCs.
^ No IAC sensor DTCs.
^ No EGR DTCs.
^ Engine running.
^ Engine speed changes less than 100 RPM.
^ Throttle position changes less than 1.95%.
^ EGR flow changes less than 5%.
^ Idle air changes less than 5 counts.
^ No change in brake switch status.
^ No change in the clutch status (manual transmission).
^ No change in A/C status.
^ No change in power steering switch status.
^ The above conditions have stabilized for a period of 2.0 seconds.

Action Taken When the DTC Sets
The VCM turns on the Malfunction Indicator Lamp (MIL) when 2 failures are reported after 2 consecutive trips. The VCM substitutes a calculated value for the MAP sensor value so acceptable performance is maintained.

Conditions for Clearing the MIL/DTC
After 3 trips without a failure, the MIL turns oft. After 40 ignition cycles, if no failure had been reported, the DTC will clean.

Diagnostic Aids
Check the MAP sensor vacuum source for leaks, restrictions or faulty connections.

Test Description
The numbers below refer to the step numbers on the diagnostic table.

NOTE: Check the MAP sensor output voltage to the VCM. Without the engine running, this voltage represents a barometric reading to the VCM. When comparing the scan tool readings to a known good vehicle, compare vehicles which use a MAP sensor having the same color insert or the same Hot Stamped number.

3. Applying 34 kPa (10 Hg) vacuum to the MAP sensor should cause the voltage to change. The voltage value obtained by subtracting the second reading from the first should be greater than 1.5 volts. When applying vacuum to the sensor, the change should be instantaneous. A slow voltage change indicates a faulty sensor.

Important:
^ The electrical connector must remain securely fastened.
^ After removing the MAP sensor from the intake manifold, replace the MAP Sensor to intake manifold seal.

5. Disconnect the sensor from the bracket 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. If OK, replace the sensor.