SENSOR-BOOST PRESSURE
DESCRIPTION
The boost pressure sensor is mounted in the charge air cross over air tube, just past the air control valve. The sensor allows the ECM to monitor air pressure down stream of the turbocharger .
OPERATION
When the intake manifold pressure is low (high vacuum) sensor voltage output is 0.25-1.8 volts at the ECM. When the intake manifold pressure is high due to turbo boost, sensor voltage output is 2.0-4.7 volts. The sensor receives a 5-volts reference from the ECM. Sensor ground is also provides by the ECM. The ECM uses boost pressure combined with intake air temerature to determine the volume of air entering the engine.
DIAGNOSIS AND TESTING - BOOST PRESSURE SENSOR
If the boost pressure sensor fails, the ECM records a DTC into memory and continues to operate the engine in one of the three limp-in modes. When the ECM is operating in this mode, a loss of power will be present, as if the turbocharger was not operating. The best method for diagnosing faults with the boost pressure sensor is with the scan tool. Refer to the Diesel Powertrain Diagnostic Manual for more information.
REMOVAL
1. Disconnect the negative battery cable.
2. Disconnect the boost pressure sensor (2) electrical connector.
3. Remove the sensor (2) fasteners from the charge air cross over tube (3), and remove sensor (2).
INSTALLATION
1. Position the boost pressure sensor onto the charge air cross over tube and install the fasteners . Tighten the fasteners to 9 N·m (80 in. lbs.).
2. Connect the sensor wiring harness connector.
3. Connect the negative battery cable.