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SERIES 50 BAROMETRIC PRESSURE SENSOR FOR THE SERIES 50G ENGINE WITH HIGH PRESSURE FUEL SYSTEM 1998 AND LATER

The Barometric Pressure Sensor (BARO sensor) is mounted to the sensor bracket at the rear of the cylinder block just above the flywheel housing. The sensor sends an electrical signal to the ECM indicating barometric pressure. It is electrically connected to the ECM through the engine sensor wire harness. A hose is attached to the inlet of the sensor to protect it form dirt and prevent plugging. The ECM uses the data in controlling fuel delivery to the engine. See Figure 34514 . ‪

1. Barometric Pressure Sensor ‪

3. Ignitor Module ‪

2. Oxygen Sensor Interface Module ‪

4. Sensor Bracket ‪

Barometric Pressure Sensor for Series 50G Engines

Replacement of the Barometric Pressure Sensor

The barometric pressure sensor is non-serviceable and must be replaced as an assembly. ‪

Removal of the Barometric Pressure Sensor

Remove the Barometric Pressure Sensor as follows: ‪

  1. Disengage the locking tang on the BARO sensor.
  2. Disconnect the hose from the inlet of the sensor.
  3. Loosen two attaching bolts and remove sensor from bracket.

Installation of the Barometric Pressure Sensor

Install the BARO sensor as follows: ‪

NOTICE:

Use care tightening sensor attaching bolts. Overtightening the bolts will damage the sensor. ‪

  1. Install the sensor on the bracket. Torque bolts to 24 inlbs.
  2. Connect the inlet hose.
  3. Engage it to the sensor wire harness connector.
  4. Turn ignition on and, with Diagnostic Data Reader, clear the AFR (air fuel ratio) learn table.
  5. Turn ignition to the "ON" position. Observe or read any diagnostic codes. If any codes other than 25 appears, refer to the DDEC II Troubleshooting Guide, 6SE489, or DDEC III/IV Single ECM Troubleshooting Guide, 6SE497