DTC P0106 w/ Throttle Actuator Control

Diagnostic Instructions

DTC Descriptor

DTC P0106: Manifold Absolute Pressure (MAP) Sensor Performance

Diagnostic Fault Information

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
5-Volt Reference	P0107, P0405, P0452, P0651, P2106, P2110	P0107	P0108, P0651, P2076	P0106
MAP Sensor Signal	P0107	P0107	P0108	P0106
Low Reference	--	P0108, P2106, P2110	--	P0106

Typical Scan Tool Data

MAP Sensor

Circuit	Short to Ground	Open	Short to Voltage
Operating Conditions: Engine operating in Closed Loop Parameter Normal Range: 32-48 kPa
5-Volt Reference	10 kPa	10 kPa	50 kPa
MAP Sensor Signal	10 kPa	10 kPa	104 kPa
Low Reference	--	98 kPa	104 kPa*
* Internal ECM or sensor damage may occur if the circuit is shorted to B+.

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

Conditions for Setting the DTC

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

Action Taken When the DTC Sets

DTC P0106 is a Type B DTC.

Conditions for Clearing the DTC

DTC P0106 is a Type B DTC.

Diagnostic Aids

Reference Information

Schematic Reference

Engine Controls Schematics

Connector End View Reference

Electrical Information Reference

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Special Tools Required

J 23738-A Vacuum Pump

Circuit/System Verification

1. Ignition ON, verify that the following DTCs are not set: P0107, P0108, or P0651.

⇒	If any of the DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle .

2. Verify that none of the following conditions exist:

•	Leaking exhaust gas recirculation (EGR) valve

•	Restricted exhaust--Refer to Restricted Exhaust .

•	Engine mechanical condition--For example, low compression or incorrect timing belt installation. Refer to Symptoms - Engine Mechanical or Timing Belt Inspection .

3. Determine the current vehicle testing altitude. Compare the MAP sensor pressure parameter to the reading in the Altitude Versus Barometric Pressure table . The MAP sensor pressure parameter should be within the specified range indicated in the table.

Important: In extreme cold weather conditions ice may form in the vacuum source to the MAP sensor and may set a DTC. Inspect the MAP sensor and the vacuum source for ice, moisture, or other restrictions.

4. Start the engine and observe the scan tool MAP sensor pressure parameter. The MAP sensor pressure parameter should change while starting the engine.
5. Engine idling, observe the scan tool MAP Sensor pressure parameter. The reading should be between 32-48 kPa.
6. 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.
7. Operate the vehicle within the conditions for running the DTC. You may also operate the vehicle within the conditions that you observed in the Freeze Frame/Failure Records data.

Circuit/System Testing

1. Verify the integrity of the entire air induction system by inspecting for the following conditions:

•	Any damaged components

•	Loose or improper installation

•	An air flow restriction

•	Any vacuum leak

•	Improperly routed vacuum hoses

•	In cold climates, inspect for any snow or ice buildup

•	Verify that restrictions do not exist in the MAP sensor port or vacuum source.

2. Ignition OFF, disconnect the vacuum source at the MAP sensor. Connect the J 23738-A to the vacuum hose.
3. Engine idling, verify that 15-20 in Hg of vacuum is available to the MAP sensor.

⇒	If the vacuum is not within the specified range, repair the restriction in the vacuum hose to the MAP sensor.

4. Ignition OFF, connect the vacuum hose to the MAP sensor. Disconnect the harness connector at the MAP sensor.
5. Ignition ON, test for less than 0.2 volt between the low reference circuit terminal A and ground.

⇒	If greater than the specified range, test the low reference circuit for a short to voltage. If the circuit/connections test normal, replace the ECM.

6. Ignition OFF for 90 seconds, test for less than 5 ohms of resistance between the low reference circuit terminal A and ground.

⇒	If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit/connections test normal, replace the ECM.

7. Ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit terminal C and ground.

⇒	If less than the specified range, test the 5-volt reference circuit for a short to ground or open/high resistance. If the circuit/connections test normal, replace the ECM.

⇒	If greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit/connections test normal, replace the ECM.

8. Verify that the MAP sensor parameter is less than 12 kPa.

⇒	If greater than the specified range, test the signal circuit terminal B for a short to voltage. If the circuit/connections test normal, replace the ECM.

9. Install a 3A fused jumper wire between the signal circuit terminal B and the 5-volt reference circuit terminal C. Verify that the MAP sensor parameter is greater than 102 kPa.

⇒	If less than the specified value, test the signal circuit for a short to ground or an open/high resistance. If the circuit/connections test normal, replace the ECM.

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

Component Testing

Skewed Signal Test

1. Ignition OFF, remove the vacuum source from the MAP sensor.
2. Ignition ON, observe and record the scan tool MAP sensor pressure data parameter. This is the first MAP sensor reading.
3. With the J 23738-A apply 5 in Hg (17 kPa) of vacuum to the MAP sensor. Observe and record the scan tool MAP sensor pressure data parameter. This is the second MAP sensor reading.
4. Subtract the second MAP sensor reading from the first MAP sensor reading. Verify that the vacuum decrease is within 1 in Hg (4 kPa) of the applied vacuum.

⇒	If the vacuum decrease is not within the specified range, replace the MAP sensor.

5. With the J 23738-A apply 10 in Hg (34 kPa) of vacuum to the MAP sensor. Observe and record the scan tool MAP sensor pressure data parameter. This is the third MAP sensor reading.
6. Subtract the third MAP sensor reading from the first MAP sensor reading. Verify that the vacuum decrease is within 1 in Hg (4 kPa) of the applied vacuum.

⇒	If the vacuum is not with in the specified range, replace the MAP sensor.

Erratic Signal Test

1. Ignition OFF, remove the vacuum source from the MAP sensor.
2. Install a 3A fused jumper wire between the 5-volt reference circuit terminal C and the corresponding terminal of the MAP sensor.
3. Install a jumper wire between the low reference circuit terminal A of the MAP sensor and ground.
4. Install a jumper wire at terminal B of the MAP sensor.
5. Connect a DMM between the jumper wire from terminal B of the MAP sensor and ground.
6. Ignition ON, install the J 23738-A to the MAP sensor vacuum port. Slowly apply vacuum to the sensor while observing the voltage on the DMM. The voltage should vary between 0.0-5.2 volts, without any spikes or dropouts.

⇒	If the voltage reading is erratic, replace the MAP sensor.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

DTC P0106 w/o Throttle Actuator Control

Diagnostic Instructions

DTC Descriptor

DTC P0106: Manifold Absolute Pressure (MAP) Sensor Performance

Diagnostic Fault Information

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
5-Volt Reference	P0107	P0107	P0108	P0106
MAP Sensor Signal	P0107	P0107	P0108	P0106
Low Reference	--	P0108	--	--

Typical Scan Tool Data

MAP Sensor

Circuit	Short to Ground	Open	Short to Voltage
Operating Conditions: Engine operating in Closed Loop Parameter Normal Range: 32-48 kPa
5-Volt Reference	10 kPa	10 kPa	50 kPa
MAP Sensor Signal	10 kPa	10 kPa	104 kPa
Low Reference	--	98 kPa	104 kPa*
* Internal ECM or sensor damage may occur if the circuit is shorted to B+.

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

Conditions for Setting the DTC

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

Action Taken When the DTC Sets

DTC P0106 is a Type B DTC.

Conditions for Clearing the DTC

DTC P0106 is a Type B DTC.

Reference Information

Schematic Reference

Engine Controls Schematics

Connector End View Reference

Electrical Information Reference

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Special Tools Required

J 23738-A Vacuum Pump

Circuit/System Verification

1. Ignition ON, verify that the following DTCs are not set: P0107, P0108, P0122, or P0123.

⇒	If any of the DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle .

2. Verify that none of the following conditions exist:

•	Leaking exhaust gas recirculation (EGR) valve

•	Restricted exhaust--Refer to Restricted Exhaust .

•	Engine mechanical condition--For example, low compression or incorrect timing belt installation. Refer to Symptoms - Engine Mechanical or Timing Belt Inspection .

3. Determine the current vehicle testing altitude. Compare the MAP sensor pressure parameter to the reading in the Altitude Versus Barometric Pressure table . The MAP sensor pressure parameter should be within the specified range indicated in the table.

Important: In extreme cold weather conditions ice may form in the vacuum source to the MAP sensor and may set a DTC. Inspect the MAP sensor and the vacuum source for ice, moisture, or other restrictions.

4. Start the engine and observe the scan tool MAP sensor pressure parameter. The MAP sensor pressure parameter should change while starting the engine.
5. Engine idling, observe the scan tool MAP Sensor pressure parameter. The reading should be between 32-48 kPa.
6. 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.
7. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze frame/Failure Records data.

Circuit/System Testing

1. Verify the integrity of the entire air induction system by inspecting for the following conditions:

•	Any damaged components

•	Loose or improper installation

•	An air flow restriction

•	Any vacuum leak

•	Improperly routed vacuum hoses

•	In cold climates, inspect for any snow or ice buildup

•	Verify that restrictions do not exist in the MAP sensor port or vacuum source.

2. Ignition OFF, disconnect the harness connector at the TP sensor.
3. Ignition ON, test for less than 0.2 volt between the low reference circuit terminal B and ground.

⇒	If greater than the specified range, test the low reference circuit for a short to voltage. If the circuit/connections test normal, replace the ECM.

4. Ignition OFF for 90 seconds, test for less than 5 ohms of resistance between the low reference circuit terminal B and ground.

⇒	If greater than specified range, test the low reference circuit for an open/high resistance. If the circuit/connections test normal, replace the ECM.

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. Ignition ON, load test for 4.8-5.2 volts between the 5-volt reference circuit terminal A and ground.

⇒	If less than the specified range, test the 5-volt reference circuit for a short to ground or open/high resistance. If the circuit/connections test normal, replace the ECM.

⇒	If greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit/connections test normal, replace the ECM.

6. Verify that the scan tool TP sensor voltage parameter is less than 0.3 volt.

⇒	If greater than the specified range, test the signal circuit terminal C for a short to voltage. If the circuit/connections test normal, replace the ECM.

7. Install a 3A fused jumper wire between the signal circuit terminal C and the 5-volt reference circuit terminal A. Verify the scan tool TP sensor voltage parameter is greater than 4.8 volts.

⇒	If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit/connections test normal, replace the ECM.

8. Ignition OFF, connect the harness connector at the TP sensor.
9. Disconnect the harness connector at the MAP sensor.
10. Ignition ON, test for less than 0.2 volt between the low reference circuit terminal A and ground.

⇒	If greater than the specified range, test the low reference circuit for a short to voltage. If the circuit/connections test normal, replace the ECM.

11. Ignition OFF for 90 seconds, test for less than 5 ohms of resistance between the low reference circuit terminal A and ground.

⇒	If greater than specified range, test the low reference circuit for an open/high resistance. If the circuit/connections test normal, replace the ECM.

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.

12. Ignition ON, load test for 4.8-5.2 volts between the 5-volt reference circuit terminal C and ground.

⇒	If less than the specified range, test the 5-volt reference circuit for a short to ground or open/high resistance. If the circuit/connections test normal, replace the ECM.

⇒	If greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit/connections test normal, replace the ECM.

13. Verify the scan tool MAP sensor parameter is less than 12 kPa.

⇒	If greater than the specified range, test the signal circuit terminal B for a short to voltage. If the circuit/connections test normal, replace the ECM.

14. Install a 3A fused jumper wire between the signal circuit terminal B and the 5-volt reference circuit terminal C. Verify the scan tool MAP sensor parameter is greater than 102 kPa.

⇒	If less than the specified range, test the signal circuit 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 the MAP sensor and the TP 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 TP sensor.

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 TP sensor.

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 TP sensor.

MAP Sensor Skewed Signal Test

1. Ignition OFF, remove the vacuum source from the MAP sensor.
2. Ignition ON, observe and record the scan tool MAP sensor pressure data parameter. This is the first MAP sensor reading.
3. With the J 23738-A apply 5 in Hg (17 kPa) of vacuum to the MAP sensor. Observe and record the scan tool MAP sensor pressure data parameter. This is the second MAP sensor reading.
4. Subtract the second MAP sensor reading from the first MAP sensor reading. Verify that the vacuum decrease is within 1 in Hg (4 kPa) of the applied vacuum.

⇒	If the vacuum decrease is not within the specified range, replace the MAP sensor.

5. With the J 23738-A apply 10 in Hg (34 kPa) of vacuum to the MAP sensor. Observe and record the scan tool MAP sensor pressure data parameter. This is the third MAP sensor reading.
6. Subtract the third MAP sensor reading from the first MAP sensor reading. Verify that the vacuum decrease is within 1 in Hg (4 kPa) of the applied vacuum.

⇒	If the vacuum is not with in the specified range, replace the MAP sensor.

MAP Sensor Erratic Signal Test

1. Ignition OFF, remove the vacuum source from the MAP sensor.
2. Install a 3A fused jumper wire between the 5-volt reference circuit terminal C and the corresponding terminal of the MAP sensor.
3. Install a jumper wire between the low reference circuit terminal A of the MAP sensor and ground.
4. Install a jumper wire at terminal B of the MAP sensor.
5. Connect a DMM between the jumper wire from terminal B of the MAP sensor and ground.
6. Ignition ON, install the J 23738-A to the MAP sensor vacuum port. Slowly apply vacuum to the sensor while observing the voltage on the DMM. The voltage should vary between 0.0-5.2 volts, without any spikes or dropouts.

⇒	If the voltage reading is erratic, replace the MAP sensor.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.