Section 5.21 PID 106, FMI 1, Flash Code 48, Intake Manifold Pressure Low

Section 5.21
PID 106, FMI 1, Flash Code 48, Intake Manifold Pressure Low

The intake manifold pressure is low due to a faulty Manifold Absolute Pressure (MAP) Sensor.‪

Section 5.21.1
Troubleshooting PID 106, FMI 1, Flash Code 48

Troubleshoot as follows:‪

1. Check the MAP Sensor using DDEC Sensor Tester J 37164 (see Figure "DDEC Sensor Tester J 37164" ).
   

   Figure 1. DDEC Sensor Tester J 37164

2. Disconnect the sensor. The MAP Sensor is threaded into the intake manifold (see Figure "MAP Sensor Location —Series 60G" ).
   

   1. Intake Manifold‪	5. Bolt‪
   2. Intake Manifold Inlet‪	6. Bolt‪
   3. Intake Manifold Gasket‪	7. ATS (Low Pressure system only)‪
   4. Cylinder head‪	8. MAP Sensor‪

   Figure 2. MAP Sensor Location —Series 60G

3. Disengage the locking tang on the MAP Sensor connector body. Grasp the terminal body and gently pull it from the sensor.
4. Remove the MAP Sensor from the intake manifold.
5. Clip the power leads to the 12 volt power source.
6. Connect the sensor to the tester at the correct connector.
7. Plug in a volt OHM meter. The tester will power up the sensor. Check the values to see if the sensor is operating properly.
   1. If sensor is faulty, replace the sensor, go to step .
   2. If the sensor is not faulty, refer to "5.21.2 Verification" .
8. Install the MAP Sensor into intake sensor manifold. Torque to 2.4-3.0 N·m (21-26 lb·in.).
9. Engage the locking tang on the MAP Sensor connector body.
10. Turn the ignition to the ON position. check the DDR for any diagnostic code(s):
    1. If the code is still active, call Detroit Diesel Technical Service.
    2. If the code is no longer active, refer to "5.21.2 Verification" .

Section 5.21.2
Verification

Verify troubleshooting as follows: ‪

1. Check the DDR to see if PID 106, FMI 1, Flash Code 48 is still active.
   1. If the code is still active, go to step 2.
   2. If the code is not active, troubleshooting is complete.
2. If the code is still active, call Detroit Diesel Technical Service.