Volt

DTC P0106

The manifold absolute pressure (MAP) sensor measures the pressure inside the intake manifold. Pressure in the inlet manifold is affected by engine speed, throttle opening, air temperature, and barometric pressure (BARO). A diaphragm within the MAP sensor is displaced by the pressure changes that occur from the varying load and operating conditions of the engine. The sensor translates this action into electrical resistance. The MAP sensor wiring includes 3 circuits. The engine control module (ECM) supplies a regulated 5 V to the sensor on a 5 V reference circuit. The ECM supplies a ground on a low reference circuit. The MAP sensor provides a signal voltage to the ECM, relative to the pressure changes, on the MAP sensor signal circuit. The ECM converts the signal voltage input to a pressure value.

Under normal operation the highest pressure that can exist in the inlet manifold is equal to BARO. This occurs when the engine is operated at wide-open throttle (WOT) or when the vehicle is ON while the engine is OFF. Under these conditions, the ECM uses the MAP sensor to determine the current BARO. The lowest manifold pressures occur when the vehicle is idling or decelerating. MAP can range from 1.5 psi, when pressures are low, to as much as 15 psi when pressures are high, depending on the BARO. The ECM monitors the MAP sensor signal for pressure outside of the normal range.

Condition 1

Condition 2

This DTC runs continuously when either of the above conditions are met.

The engine control module (ECM) detects that the MAP sensor pressure is not within range of the calculated pressure that is derived from the system of models for more than 0.5 s.

DTC P0106 is a Type B DTC.

DTC P0106 is a Type B DTC.

Schematic Reference

Engine Controls Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Hybrid Modes of Operation Description

Electrical Information Reference

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Special Tools

J-23738-A Vacuum Pump

For equivalent regional tools, refer to Special Tools : Diagnostic Tools .

1. Vehicle in Service Mode, verify DTC P0697 is not set.

⇒	If DTC P0697 is set, refer to DTC P0641, P0651, P0697, or P06A3 : ECM .

2. Determine the current vehicle testing altitude. Vehicle in Service Mode, observe the scan tool BARO Sensor parameter. Compare the parameter to the Altitude Versus Barometric Pressure table. The BARO sensor pressure parameter should be within the specified range indicated in the table.
3. Observe the scan tool MAP sensor parameter. Engine running, the MAP Sensor parameter should change.
4. Operate the vehicle within the conditions for running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the freeze frame/failure records data.

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

•	Any damaged components

•	Loose or improper installation

•	Improperly routed vacuum hoses

•	Any vacuum leak

•	Any type of restriction

•	MAP sensor seal that is missing or damaged

2. Verify that restrictions do not exist in the exhaust system. Refer to Restricted Exhaust .
3. Vehicle OFF, disconnect the harness connector at the B74 MAP sensor.
4. Vehicle OFF, all systems OFF. It may take up to 2 minutes for all vehicle systems to power down. Test for less than 5 Ω between the low reference circuit terminal 2 and ground.

⇒	If greater than the specified value, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the K20 ECM.

5. Vehicle in Service Mode, test for 4.8-5.2 V between the 5 V reference circuit terminal 1 and ground.

⇒	If less than the specified range, test the 5 V reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K20 ECM.

⇒	If greater than the specified range, test the 5 V reference circuit for a short to voltage. If the circuit tests normal, replace the K20 ECM.

6. Verify the scan tool MAP Sensor parameter is less than 0.5 V.

⇒	If greater than the specified range, test the signal circuit terminal 3 for a short to voltage. If the circuit tests normal, replace the K20 ECM.

7. Install a 3 A fused jumper wire between the signal circuit terminal 3 and the 5 V reference circuit terminal 1. Verify the scan tool MAP Sensor parameter is greater than 4.7 V.

⇒	If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K20 ECM.

8. If all circuits test normal, test or replace the MAP sensor.

Note: You must perform the Circuit/System Testing in order to verify the integrity of the MAP sensor circuits before proceeding with the Component Testing.

Skewed Sensor Test

1. Vehicle in Service Mode, observe the MAP sensor scan tool parameter.
2. Use the observed MAP Sensor scan tool parameter that is closest to a value that is indicated in the first column of the table.
3. Connect the J-23738-A to the port of the B74 MAP sensor.
4. Apply 5 in Hg of vacuum to the B74 MAP sensor, with the J-23738-A. The MAP sensor parameter in the first column of the table should decrease by 2.5 psi. The acceptable range is indicated in the second column of the table.
5. Apply 10 in Hg of vacuum to the B74 MAP sensor using the J-23738-A. The MAP sensor parameter in the first column of the table should decrease by 5 psi. The acceptable range is indicated in the third column of the table.

Erratic Signal Test

1. Vehicle OFF, remove the B74 MAP sensor.
2. Install a 3 A fused jumper wire between the 5 V reference circuit terminal 1 and the corresponding terminal of the B74 MAP sensor.
3. Install a jumper wire between the low reference terminal 2 of the B74 MAP sensor and ground.
4. Install a jumper wire at terminal 3 of the B74 MAP sensor.
5. Connect a DMM between the jumper wire from the terminal 3 of the B74 MAP sensor and ground.
6. Vehicle in Service Mode, with the J-23738-A, slowly apply vacuum to the sensor while observing the voltage on the DMM. The voltage should vary between 4.9-0.2 V without any spikes or dropouts.

⇒	If the voltage is erratic, replace the B74 MAP sensor.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.