The turbocharger pressure sensor responds to pressure changes in the intake manifold. The pressure changes occur based on the engine load, and turbocharger boost. The engine control module (ECM) supplies 5 volts to the turbocharger pressure sensor on the 5-volt reference circuit. The ECM provides a ground on the low reference circuit. The turbocharger pressure sensor provides a signal to the ECM on the 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 deceleration. The ECM detects a high signal voltage at a high MAP, such as the ignition is ON, with the engine OFF, or at idle. The barometric pressure (BARO) sensor is internal to the ECM. This location allows for constant monitoring of the barometric pressure. The ECM compares the turbocharger pressure sensor signal to the internal BARO sensor signal when the ignition switch is turned ON, with the engine OFF.

The ECM detects that the difference between the MAP signal and the BARO signal is greater than 20 kPa for 1 second.

DTC P0069 is a Type B DTC.

DTC P0069 is a Type B DTC.

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 Mity Vac

1. Ignition ON, observe the DTC information with a scan tool. DTC P0069 should not set.

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. Compare the scan tool MAP sensor pressure parameter, and the scan tool BARO sensor pressure parameter, to the pressure parameter of a known good vehicle. Both readings should be within 3 kPa of the known 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. Compare the scan tool MAP sensor pressure parameter, and the scan tool BARO sensor pressure parameter, to the reading in the Altitude Versus Barometric Pressure table . Both parameters should be within the specified range indicated on the table.
4. 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 List.

1. Ignition ON, compare the scan tool BARO pressure sensor parameter to the reading in the Altitude Versus Barometric Pressure table.

⇒	If the reading is not within the specified range, refer to DTC P2226, P2228, or P2229 for further diagnosis.

2. Ignition OFF, and the MAIN fuse removed, disconnect the harness connector at the turbocharger boost pressure sensor.
3. Test for less than 5 ohms of resistance between the low reference circuit terminal 4 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.

4. Install the MAIN fuse. Ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit terminal 2 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.

5. Verify that the scan tool MAP sensor parameter is less than 24 kPa.

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

6. Install a 3A fused jumper wire between the signal circuit terminal 1 and the 5-volt reference circuit terminal 2. Verify that the MAP sensor parameter is between 40-45 kPa.

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

⇒	If greater than the specified range, test the signal circuit for a high resistance. If the circuit/connections test normal, replace the ECM.

7. If all circuits/connections test normal, test or replace the turbocharger boost pressure sensor.

1. Ignition OFF, perform one of the following applicable procedures.

•	Disconnect the vacuum supply hose from the turbocharger boost pressure sensor

•	Remove the turbocharger boost pressure sensor from the intake manifold

2. Ignition ON, observe and record the scan tool MAP sensor pressure data parameter. This is the first MAP sensor reading.
3. Engine idling, with the J 23738-A apply 5 in Hg (17 kPa) of vacuum to the turbocharger boost pressure 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 turbocharger boost pressure 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 turbocharger boost pressure sensor.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.