DTC P0106. Chevrolet Epica 2005

For 1990-2009 cars only

Makes 🢒 Chevrolet 🢒 2005 🢒 Epica 🢒 Engine 🢒 Engine Controls - 2.0L (L34 GMDAT) 🢒 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 TP sensor is more than 28 percent. 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, P0117, P0118, P0122, P0123, P0201, P0202, P0203, P0204, P0300, P0351, P0352, P0401, P0402, P0404, P0405, P0406, P0443, P0506, P0507, and P1404 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 third 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 4 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.

Diagnostic Aids

With the ignition ON and the engine stopped, the manifold pressure is equal to atmospheric pressure and the signal voltage will be high. This information is used by the ECM as an indication of vehicle altitude. Comparison of this reading with a known good vehicle with the same sensor is a good way to test the accuracy of a suspect sensor. Readings should be the same +0.4 volt. The MAP sensor vacuum source should be thoroughly inspected for restrictions at the intake manifold.

Test Description

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

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.

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.

Step

Action

Value

Yes

Schematic Reference: Engine Controls Schematics

Connector End View References: Engine Control Module Connector End Views or Engine Controls Connector End Views

Did you perform the Diagnostic System Check - Engine Controls?

Go to Step 2

Go to Diagnostic System Check - Engine Controls

Turn ON the ignition, with the engine OFF.
Observe the Throttle Position (TP) Sensor voltage parameter with a scan tool.

Is the voltage less than the specified value when the throttle is fully closed?

0.4 V

Go to Step 3

Go to Step 4

Observe the TP sensor angle parameter with a scan tool.
Monitor the scan tool while slowly depressing the accelerator pedal to wide open throttle (WOT), then slowly release the pedal. Repeat the procedure several times.

Does the TP angle increase steadily when the accelerator pedal is depressed to more than the first specified value, and decrease steadily, returning to less than the second specified value when the pedal is released?

85%

15%

Go to Step 5

Go to Step 18

Inspect the throttle body for the following conditions:

•	A binding or damaged linkage

•	A binding or damaged throttle cable

•	A binding or damaged cruise control cable

Did you find and correct the condition?