P0106

Manifold Absolute Pressure (MAP) Sensor Circuit:

Circuit Description
The PCM uses the Manifold Absolute Pressure (MAP) sensor output voltage to assist in controlling fuel delivery and ignition timing. The PCM supplies a 5 volt reference signal voltage and a ground circuit to the MAP sensor. As the manifold pressure changes, the output voltage of the sensor also changes. By monitoring the sensor output voltage, the PCM knows the manifold pressure. A lower pressure (low voltage) output voltage will be about 1.0 to 1.5 volts at idle. While higher pressure (high voltage) output voltage will be about 4.5 to 4.8 volts at Wide Open Throttle (WOT). The MAP sensor is also used to record barometric pressure during engine start up and at wide open throttle. This allows the PCM to make adjustments for different altitudes.

Conditions for Setting the DTC
- The engine speed is stable ± 150 RPM.
- The Idle Air Control (IAC) solenoid is stable ± 10 counts.
- The Throttle Position (TP) sensor is stable ± 1%.
- The EGR valve is stable ± 0%.
- The above conditions met for 0.4 seconds.
- The MAP sensor changes greater than 6.3 kPa (0.33V).
- One or more of the following DTCs are not set P0107 or P0108.

Action Taken When the DTC Sets
- The Malfunction Indicator Lamp (MIL) will illuminate.
- The PCM will record operating conditions at the time the diagnostic fails. This information will be stored in the Freeze Frame and Failure Records buffers.
- A history DTC is stored.

Conditions for Clearing the MIL/DTC
- The MIL will turn "OFF" after three consecutive ignition cycles in which the diagnostic runs without a fault.
- A history DTC will clear after 40 consecutive warm up cycles without a fault.
- DTCs can be cleared by using a scan tool.

Diagnostic Aids
With the ignition "ON" and the engine "OFF" the manifold pressure should be equal to atmospheric pressure. The signal voltage will be high. Comparison of this reading with a known good vehicle with the same style sensor is a good way to check the accuracy of a "suspect" sensor. Readings should be the same ± 0.4 volt.

DTC P0106 - Manifold Absolute Pressure (MAP) System Performance (1 Of 2):

DTC P0106 - Manifold Absolute Pressure (MAP) System Performance (2 Of 2):

Test Description
Numbers below refer to the step numbers on the Diagnostic Table.
1. The OBD System Check prompts the Technician to complete some basic checks and store the Freeze Frame Data and the Failure records on the scan tool if applicable. This creates an electronic copy of the data taken when the fault occurred. This information on the scan tool can be referred to later.
2. Output changes greater than 6.3 kPa verify if the fault is present.
3. Whenever the PCM recognizes the change, the PCM, the MAP sensor 5V reference circuit, and the MAP signal circuit are OK.
4. Output changes greater than 6.3 kPa indicate a possible faulty connector or connection.
5. Check terminals for proper mating, broken locks, improperly formed or damaged terminals, and poor terminal to wiring connections.
9. Because the MAP sensor is sensitive to pressure change, the MAP sensor must have its own vacuum source or the MAP sensor may detect pressure changes due to other devices using the same vacuum source.
12. Before replacing the PCM, check terminals for improper mating, broken locks, or physical damage to the wiring harness. Replacement PCM must be programmed.