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 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 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 MAP sensor contains the following circuits:
- A 5-volt reference
- A low reference
- A MAP sensor signal

If the ECM detects the MAP sensor signal is not within the predicted range this DTC sets.

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

CONDITION FOR RUNNING THE DTC
- DTCs P0107, P0108, P0115, P0117, P0118, P0122, P0123, P0125, P0201, P0202, P0203, P0204, P0300, P0351, P0352, P0401, P0402, P0404, P0405, P0406, P0441, P0443, P0488, P0506, P0507 are not set.
- The engine is running.
- Valid barometric pressure (BARO) update.
- The traction control is not active.
- The torque converter clutch (TCC) is steady (A/T).
- The A/C compressor clutch is steady.
- The coolant temperature is more than -10°C (14°F).
- The engine speed is between 1,300-4,500 RPM.
- The change in engine speed is less than 200 RPM.
- The change in idle air is less than 5 percent.
- The change in throttle position (TP) is less than 3 percent, or the change in MAP is less than 5 percent.
- The change in exhaust gas recirculation (EGR) position is less than 6 percent.
- The above conditions are stabilized for 1.5 seconds.
- DTC P0106 runs continuously once the above conditions are met.

CONDITIONS FOR SETTING THE DTC
The ECM detects that the actual MAP signal is not within the predicted range for more than 25 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 1-3:

Steps 4-6:

Steps 7-9:

Steps 10-11:

Steps 12-15:

Steps 16-19:

Steps 20-23:

Steps 24-29:

Steps 30-34:

Steps 35-39:

The numbers below refer to the step numbers on the diagnostic table.
8. While starting the engine, the MAP sensor should detect any changes in manifold pressure. This test is to determine if the sensor is stuck at a value.
9. A normal MAP sensor will react as quickly to the throttle changes. A MAP sensor should not appear to be "lazy" or catch up with the throttle movements.