MBE 900 4000 Troubleshooting

Section 8.2 Troubleshooting PID 102

Section 8.2
Troubleshooting PID 102

The following procedures will troubleshoot PID 102.‪

Section 8.2.1
102 00 – Boost Pressure High Fault

Perform the following steps to troubleshoot a boost pressure high fault:‪

  1. Check for historic fault codes in addition to 102 00.
    1. If other historic fault codes are present, troubleshoot other fault codes first.
    2. If only fault code 102 00 is present, go to step 2 .
  2. Check the condition of the boost air combination sensor (look for cracks, corrosion, missing or bent pins). See Figure "Turbo Boost Air Combination Sensor" .
    Click to see this graphic in a separate window

    Figure 1. Turbo Boost Air Combination Sensor

    1. If sensor is not in good condition, replace sensor. Erase fault code memory.
    2. If sensor is in good condition, go to step 3 .
  3. Check waste gate operation.
    1. If waste gate is not working, repair or replace the turbocharger. Erase fault code memory.
    2. If waste gate is working, go to step 4 .
  4. Measure turbo boost pressure.
    1. If boost pressure is not within acceptable range, repair or replace the turbocharger. Erase fault code memory.
    2. If boost pressure is within acceptable range, contact Detroit Diesel Technical Service.

Section 8.2.2
102 01 – Boost Pressure Low Fault

Perform the following steps to troubleshoot a boost pressure low fault:‪

  1. Check for a restricted air filter or air intake system.
    1. If the air filter or air intake system is restricted, replace the air filter and/or eliminate the restriction in the air intake system. Erase fault code memory.
    2. If the air filter or air intake system is not restricted, go to step 2 .
  2. Check the condition of the boost air combination sensor. See Figure "Turbo Boost Air Combination Sensor" .
    1. If sensor is not in good condition, replace sensor. Erase fault code memory.
    2. If sensor is in good condition, go to step 3 .
  3. Visually inspect the CAC (charge air cooler) and the CAC hoses for leaks.
    1. If leaks are found, repair or replace the CAC and/or CAC hoses. Erase fault code memory.
    2. If no leaks are found, go to step 4 .
  4. Check for a faulty turbocharger (compressor wheel does not spin freely or is rubbing on side walls).
    1. If the turbocharger is faulty, replace it. Erase fault code memory.
    2. If the turbocharger is not faulty, go to step 5 .
  5. Check for other historic fault codes.
    1. If other historic fault codes are present, refer to the other fault codes.
    2. If only fault code 102 01 is present, go to step 6 .
  6. Check waste gate operation.
    1. If waste gate is not working, repair or replace the turbocharger. Erase fault code memory.
    2. If waste gate is working, go to step 7 .
  7. Verify that fuel delivery is within specifications (no restrictions to fuel flow).
    1. If fuel delivery is not within specifications, eliminate restrictions in fuel delivery system. Erase fault code memory.
    2. If fuel delivery is within specifications, contact Detroit Diesel Technical Service.

Section 8.2.3
102 02 – Boost Pressure Sensor Data Erratic Fault

Perform the following steps to troubleshoot a boost pressure sensor data erratic fault:‪

  1. Check for additional active fault codes.
    1. If fault code 233 12 is active in addition to fault code 102 02, refer to "28.2.1 233 12 – PLD-MR Failed or Programmed Incorrectly" .
    2. If only fault code 102 02 is active, go to step 2 .
  2. Measure turbo boost pressure with the engine running. Stop the engine and compare with atmospheric pressure.
    1. If boost pressure is within the acceptable range, check and clean the combination sensor contacts (remove any corrosion). Erase fault code memory.
    2. If boost pressure is not within the acceptable range, go to step 3 .
  3. Bridge pins 1 and 3 of the combination sensor. See Figure "Turbo Boost Air Combination Sensor" , and see Figure "Location of Boost Air Combination Sensor Harness Wires" .
    1. If new fault code 102 04 is active after bridging pins, replace the sensor. Erase fault code memory.
    2. If fault code 102 04 is not active after bridging pins, go to step 4 .
  4. Measure the resistance between pin 3 of the combination sensor and wire 7 of the 55-pin connector harness. See Figure "Turbo Boost Air Combination Sensor" , and see Figure "Location of Boost Air Combination Sensor Harness Wires" .
    Click to see this graphic in a separate window

    Figure 2. Location of Boost Air Combination Sensor Harness Wires

    1. If resistance is greater than 3 Ω, repair open circuit in 55-pin connector wire 7 to pin 3 of the sensor. Erase fault code memory.
    2. If resistance is less than 3 Ω, check and clean contacts (remove any corrosion). Erase fault code memory.

Section 8.2.4
102 03 – Boost Pressure Sensor Open Circuit Fault

Perform the following steps to troubleshoot a boost pressure sensor open circuit fault:‪

  1. Check for additional active fault codes.
    1. If fault code 105 03 is active in addition to fault code 102 03 with boost air combination sensor connected, repair open circuit in 55-pin connector wire 21 to pin 1 of the sensor. See Figure "Location of Boost Air Combination Sensor Harness Wires" . Erase fault code memory.
    2. If only fault code 102 03 is active with sensor connected, go to step 2 .
  2. Bridge pins 1 and 4 of the combination sensor. See Figure "Turbo Boost Air Combination Sensor" , and see Figure "Location of Boost Air Combination Sensor Harness Wires" .
    1. If new fault 102 04 is active, repair short to power in 55-pin connector wire 29 to pin 4 of the sensor. Erase fault code memory.
    2. If fault 102 04 is not active, repair open circuit in 55-pin connector wire 29 to pin 4 of the sensor. Erase fault code memory.

Section 8.2.5
102 04 – Boost Pressure Sensor Short to Ground Fault

Perform the following steps to troubleshoot a boost pressure sensor short to ground fault:‪

  1. Unplug the boost air combination sensor and check fault codes.
    1. If new faults 102 03 and 105 03 are active, replace the sensor. Erase fault code memory.
    2. If new fault 105 03 is active in addition to fault 102 04, go to step 2 .
  2. Measure the resistance between pins 1 and 3 on the combination sensor. See Figure "Turbo Boost Air Combination Sensor" , view “A” and see Figure "Location of Boost Air Combination Sensor Harness Wires" .
    1. If resistance is less than 30 kΩ, repair short circuit between wires 21 and 7 on the 55-pin connector harness. Erase fault code memory.
    2. If resistance is greater than 30 kΩ, go to step 3 .
  3. Measure the resistance between pin 4 of the combination sensor and vehicle ground. See Figure "Turbo Boost Air Combination Sensor" , view “A” and see Figure "Location of Boost Air Combination Sensor Harness Wires" .
    1. If resistance is less than 30 kΩ, repair short to ground in 55-pin connector wire 29 to pin 4 of the sensor. Erase fault code memory.
    2. If resistance is greater than 30 kΩ, go to step 4 .
  4. Measure the resistance between pin 3 of the combination sensor and vehicle ground. See Figure "Turbo Boost Air Combination Sensor" , view “A” and see Figure "Location of Boost Air Combination Sensor Harness Wires" .
    1. If resistance is less than 30 kΩ, repair short to ground in 55-pin connector wire 7 to pin 3 of the sensor. Erase fault code memory.
    2. If resistance is greater than 30 kΩ, go to step 5 .
  5. Clean and check combination sensor contacts (remove corrosion).
    1. If fault is not active, erase fault code memory.
    2. If fault is still active, contact Detroit Diesel Technical Service for authorization to replace the PLD-MR. Set parameters on new PLD-MR.


MBE 900/4000 Troubleshooting Guide - 6SE422
Generated on 10-13-2008

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