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Home >> Chevrolet >> 2006 >> Optra (CANADA) L4-2.0L >> Repair and Diagnosis >> A L L Diagnostic Trouble Codes ( DTC ) >> Testing and Inspection >> P Code Charts >> P0106

P0106




DTC P0106

DTC Descriptor
DTC P0106
- Manifold Absolute Pressure (MAP) Sensor Performance

Diagnostic Fault Information

Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.






Typical Scan Tool Data






Circuit/System 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 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 detects a low signal voltage at a low MAP, such as during an idle or a deceleration. The ECM detects 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 throttle position (TP) sensor is greater than 28 percent.

Condition for Running the DTC

* DTCs P0107, P0108, P0122, P0123, P1106, and P1107 are not set.
* The engine is running.
* The MAP sensor test is ran in decel fuel cut-off (DFCO) and power enrichment modes with the following conditions present:

Decel Fuel Cut-Off (DFCO)
* The engine speed is between 1,300-4,500 RPM.
* The coolant temperature is greater than 17°C (63°F).
* The change in TP is less than 20 percent.
* The vehicle speed is greater than 15 km/h (9 mph).
* The above conditions are stabilized for 1.5 seconds.

Power Enrichment
* The engine speed is between 1,300-4,500 RPM.
* The traction control is not active.
* The torque converter clutch (TCC) is steady (A/T).
* The A/C compressor clutch is steady.
* The brakes are not applied.
* The coolant temperature is greater than 17 C (63 F).
* The change in engine speed is less than 200 RPM.
* The above conditions are stabilized for 1.5 seconds.
* The change in TP is less than 3 percent.
* The change in MAP is less than 5 kPa.

* The DTC runs continuously when the above conditions are met in the specific mode.

Conditions for Setting the DTC

The ECM detects that the actual MAP signal is not within the predicted range for more than 15 seconds.

Action Taken When the DTC Sets

DTC P0106 is a Type B DTC.

Conditions for Clearing the MIL/DTC

DTC P0106 is a Type B DTC.

Reference Information

Schematic Reference

Engine Controls Schematics Electrical Diagrams

Connector End View Reference
* Engine Control Module (ECM) Connector End Views Engine Control Module (ECM) Connector End Views
* Engine Controls Connector End Views Engine Controls Connector End Views

Electrical Information Reference
* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs

DTC Type Reference

Diagnostic Trouble Code (DTC) Type Definitions Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference
* Scan Tool Data List Scan Tool Data List
* Scan Tool Data Definitions Scan Tool Data Definitions
* Scan Tool Output Controls Scan Tool Output Controls

Circuit/System Verification

1. Start the engine. Observe the MAP Sensor parameter. The reading should be between 32-42 kPa.

Important: The vehicle used for the comparison is not limited to the same type of vehicle being serviced. A vehicle known to provide an accurate reading is acceptable.


2. Ignition ON, engine OFF, compare the MAP sensor pressure parameter to the pressure parameter of a known good vehicle. The reading should be within 3 kPa of the know good vehicle.

Important: The Altitude vs Barometric Pressure table indicates a pressure range for a given altitude under normal weather conditions. Weather conditions consisting of very low or very high pressure and/or very low or very high temperature may cause a reading to be slightly out of range.


3. Ignition ON, engine OFF, compare the MAP sensor pressure parameter to the reading in the Altitude vs Barometric Pressure Altitude vs Barometric Pressure. The MAP sensor pressure parameter should be within the specified range indicated on the table.
4. Start the engine. The MAP sensor pressure parameter should change while starting the engine.
5. Engine running, snap the throttle while observing the MAP sensor pressure parameter on the scan tool. The MAP sensor pressure parameter should change rapidly when the throttle position changes.
6. If the vehicle passes the Circuit/System Verification Test, then operate the vehicle within the conditions for running the DTC. You may also operate the vehicle within the conditions that are captured in the Freeze Frame/Failure Records Data List.

Circuit/System Testing

1. Verify that none of the following conditions exist:

* Vacuum leaks or restrictions at the MAP sensor.
* Engine vacuum leaks
* Restricted exhaust-Refer to Restricted Exhaust Restricted Exhaust.
* Worn piston rings-Refer to Engine Compression Test Testing and Inspection.
* Incorrect cam timing-Refer to Timing Belt Inspection 1. Timing Belt Inspection for the correct timing.

2. Ignition OFF, disconnect the harness connector of the throttle body assembly.
3. Ignition ON, verify that the TP sensor position sensor voltage parameter is less than 0.3 volt.

• If greater than 0.3 volt, test the signal circuit of the TP sensor for a short to voltage. If the circuit/connections test normal, replace the ECM.

Important: The test lamp is used to load the circuit and may not illuminate.


4. Ignition ON, connect a test lamp between the 5-volt reference circuit of the TP sensor and the negative terminal of the battery.

Important: The 5-volt reference circuits are internally and externally connected at the ECM. Other component DTCs may be set. If other DTCs are set, review the electrical schematic and diagnose the applicable circuits and components.


5. Test for 4.8-5.2 volts between the 5-volt reference circuit of the TP sensor and the negative terminal of the battery.

• If less than 4.8 volts, test the 5-volt reference circuit of the TP sensor for a short to ground or open/high resistance. If the circuit/connections test normal, replace the ECM.

• If greater than 5.2 volts, test the 5-volt reference circuit of the TP sensor for a short to voltage. If the circuit/connections test normal, replace the ECM.

6. Ignition OFF, test for less than 5 ohms of resistance between the low reference circuit of the TP sensor/ISC motor position sensor and the negative terminal of the battery.
7. Ignition OFF, connect the harness connector of the throttle body assembly.
8. Ignition OFF, disconnect the harness connector of the MAP sensor.
9. Ignition ON, verify that the MAP sensor parameter is less than 12 kPa.

• If greater than 12 kPa, test the signal circuit of the MAP sensor for a short to voltage. If the circuit/connections test normal, replace the ECM.

Important: The test lamp is used to load the circuit and may not illuminate.


10. Ignition ON, connect a test lamp between the 5-volt reference circuit of the MAP sensor and the negative battery terminal.

Important: The 5-volt reference circuits are internally and externally connected at the ECM. Other component DTCs may be set. If other DTCs are set, review the electrical schematic and diagnose the applicable circuits and components.


11. Test for 4.8-5.2 volts between the 5-volt reference circuit of the MAP sensor and the negative battery terminal.

• If less than 4.8 volts, test the 5-volt reference circuit of the MAP sensor for a short to ground or open/high resistance. If the circuit/connections test normal, replace the ECM.

• If greater than 5.2 volts, test the 5-volt reference circuit of the MAP sensor for a short to voltage. If the circuit/connections test normal, replace the ECM.

12. Ignition ON, test for less than 0.2 volt between the low reference circuit of the MAP sensor and the negative battery terminal.

• If greater than 0.2 volt, test the low reference circuit of the MAP sensor for a short to voltage. If the circuit/connections test normal, replace the ECM.

13. Ignition OFF, test for less than 5 ohms of resistance between the low reference circuit of the MAP sensor and the negative terminal of the battery.

• If greater than 5 ohms, test the low reference circuit of the MAP sensor for an open/high resistance. If the circuit/connections test normal, replace the ECM.

14. Ignition ON, install a 3-amp fused jumper wire between the signal circuit and the 5-volt reference circuit of the MAP sensor to verify that the MAP sensor parameter is greater than 102 kPa.

• If less than 102 kPa, test the signal circuit of the MAP sensor for a short to ground or an open/high resistance. If the circuit/connections test normal, replace the ECM.

15. If all circuits/connections test normal, test or replace the MAP sensor.

Component Testing

TP Sensor
1. Ignition OFF, disconnect the harness connector of the throttle body assembly.
2. Measure for 1,160-1,175 ohms between the 5-volt reference and the low reference terminals of the TP sensor.

• If the resistance is not within the specified range, replace the throttle body assembly.

3. Measure the resistance between the signal terminal and the low reference terminal of the TP sensor. Sweep the TP sensor through the entire range. The resistance should vary between 1,530 and 630 ohms without any spikes or dropouts.

• If the resistance is not within the specified range or is erratic, replace the throttle body assembly.

4. Apply 5-volts and ground to the applicable terminals of the TP sensor, and measure the voltage between the signal and the low reference terminals. Sweep the TP sensor through the entire range. The voltage should vary between 4.3-0.6 volts without any spikes or dropouts.

• If the voltage is not within the specified range or is erratic, replace the throttle body assembly.

MAP Sensor
1. Ignition OFF, disconnect the harness connector of the MAP sensor.
2. Apply 5 volts and ground to the applicable terminals of the MAP sensor and measure the voltage from the signal circuit of the MAP sensor to the negative battery terminal. Apply the specified vacuum to the MAP sensor.

• If voltage is not with in the specified range, replace the MAP sensor.





Repair Instructions

Important: Always perform the Diagnostic Repair Verification Diagnostic Repair Verification after completing the diagnostic procedure.


* Manifold Absolute Pressure (MAP) Sensor Replacement Service and Repair
* Throttle Body Assembly Replacement Removal and Replacement
* Control Module References Control Module References for engine control module replacement, setup, and programming

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