P0106

DTC P0106

CIRCUIT DESCRIPTION
The manifold absolute pressure (MAP) sensor responds to pressure changes in the intake manifold. The pressure changes occur based on the engine load. The MAP sensor has the following circuits:
- A 5-volt reference circuit
- A low reference circuit
- A MAP sensor signal circuit

The engine control module (ECM) supplies 5 volts to the MAP sensor on the 5-volt reference circuit. The ECM, also, provides a ground on the low reference circuit. The MAP sensor provides a signal to the ECM on the MAP sensor signal circuit which is relative to the pressure changes in the manifold. The ECM should detect a low signal voltage at a low MAP, such as during an idle or a deceleration. The ECM should detect a high signal voltage at a high MAP, such as the ignition is ON, with the engine OFF, or at a wide open throttle (WOT). The MAP sensor is also used in order to determine the barometric pressure (BARO). This occurs when the ignition switch is turned ON, with the engine OFF. The BARO reading may also be updated whenever the engine is operated at WOT. The ECM monitors the MAP sensor signal for voltage outside of the normal range.

The ECM calculates a predicted value for the MAP sensor based on throttle position and engine speed. The ECM then compares the predicted value to the actual MAP sensor signal. If the ECM detects that the MAP sensor signal is not within the predicted range, DTC P0106 sets.

DTC DESCRIPTOR
This diagnostic procedure supports the following DTC:
DTC P0106 Manifold Absolute Pressure (MAP) Sensor Performance

CONDITIONS FOR RUNNING THE DTC
- DTCs P0102, P0103, P0107, P0108, P0112, P0113, P0117, P0118, P0335, and P0336 are not set.
- The engine speed is between 400-6,800 RPM.
- The change in engine speed is less than 125 RPM.
- The engine coolant temperature (ECT) is between 70-125°C (158-257°F).
- The intake air temperature (IAT) is between -7°C and +125°C (+19°F and +257°F).
- The above conditions are present for more than 1 second.
- DTC P0106 runs continuously when the above conditions are met.

CONDITIONS FOR SETTING THE DTC
The MAP signal is more than 15 kPa from the predicted MAP signal for more than 4 seconds.

ACTION TAKEN WHEN THE DTC SETS
- The control module illuminates the malfunction indicator lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.
- The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the Failure Records.

CONDITIONS FOR CLEARING THE MIL/DTC
- The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
- A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
- A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
- Clear the MIL and the DTC with a scan tool.

TEST DESCRIPTION

Steps 1 - 7:

Steps 8 - 15:

Steps 16 - 23:

The numbers below refer to the step numbers on the diagnostic table.
5. This step tests the ability of the MAP sensor to correctly indicate BARO.
7. This step tests the ability of the MAP sensor to respond to an increase in engine vacuum.
9. This step tests for a proper MAP sensor pressure with an applied vacuum.