P0106

DTC P0106 Manifold Absolute Pressure (MAP) Sensor Circuit Range Problem:

Manifold Absolute Pressure (MAP) Sensor Circuit:

CIRCUIT DESCRIPTION
The Manifold Absolute Pressure (MAP) sensor responds to changes in intake manifold pressure (vacuum). A 5 volt reference is applied to the sensor on CKT 474. A variable resistor moves in relation to manifold pressure and a voltage signal is sent back to the Vehicle Control Module-A (VCM-A) on CKT 432. This voltage signal will vary from 1-1.5 volts at closed throttle to 4-4.6 volts at wide open throttle (low vacuum).

Any substantial change in MAP must be preceded by a substantial change in throttle position and engine speed. If a substantial change in MAP has occurred and it was not preceded by a change in throttle position or engine speed, then a MAP malfunction has occurred. DTC P0106 is a type "B" DTC.

The VCM-A utilizes the MAP signal and throttle position to determine the correct amount of fuel delivered to the engine.

DTC PO1O6 WILL SET WHEN
^ No Throttle Position (TP) sensor DTC's set.
^ Engine running.
^ Engine speed changes less than 100 RPM.
^ Throttle Position changes less than 2%.
^ Idle Air Control changes less than 10 counts.
^ Exhaust Gas Recirculation (EGR) Flow Rate changes less than 10%.
^ No change in Brake Switch status.
^ No change in Clutch Switch status.
^ No change in Power Steering Switch status.
^ No change in A/C clutch status.
^ MAP sensor changes more than 0.58 volts.
^ Above conditions met for 0.5 sec.

ACTION TAKEN (VCM-A WILL DEFAULT TO)
The VCM-A will turn "ON" the MIL when DTC P0106 is reported and 1 failure has occurred. The VCM-A will substitute a calculated value for the MAP sensor value so acceptable performance is maintained.

DTC P01O6 WILL CLEAR WHEN
The VCM-A will turn the MIL "OFF" after three consecutive trips without a fault condition present. A history DTC will be cleared if no fault conditions have been detected for forty warm-up cycles [coolant temperature has risen 22°C (40°F) from start-up coolant temperature and engine coolant temperature exceeds 71°C (160°F) that same ignition cycle] or the Tech 1 clearing feature has been used.

DTC CHART TEST DESCRIPTION
Number(s) below refer to circled number(s) on the diagnostic chart.

Important
^ Be sure to use the same diagnostic test equipment for all measurements.

1. Checks MAP sensor output voltage to the VCM-A. This voltage, without engine running, represents a barometric reading to the VCM-A.

NOTE: When comparing scan tool readings to a known good vehicle, it is important to compare vehicles that use a MAP sensor having the same color insert or the same "Hot Stamped" number.

2. 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 low voltage change indicates a faulty sensor.
3. Disconnect the sensor from the bracket and gently twist the sensor to check for intermittent connections. Output changes greater than 0.1 volt indicate a bad connector or connection. If OK, replace the sensor.

NOTE: Be certain that the electrical connector remains securely fastened.

DIAGNOSTIC AIDS
Check the MAP sensor vacuum source for leaks, restrictions or faulty connections.

Check MAP sensor mounting screws to be tight and secure.