MBE 900 4000 Troubleshooting

Section 7.2 Troubleshooting PID 100

Section 7.2
Troubleshooting PID 100

The Oil Combination Sensor contains an Engine Oil Pressure sensor and an Oil Temperature Sensor. It is located at the base of the oil filter, mounted on the right-front side of the engine. See Figure "Location of the Oil Combination Sensor" and see Figure "Close-up View of Oil Combination Sensor" .‪

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 1. Wiring Connector‪

 2. Oil Combination Sensor‪

Figure 1. Location of the Oil Combination Sensor

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 1. Oil Combination Sensor‪

 2. Turbocharger‪

Figure 2. Close-up View of Oil Combination Sensor

The following procedures will troubleshoot PID 100.‪

Section 7.2.1
100 01 – Oil Pressure Low

Perform the following steps to troubleshoot a low oil pressure fault code:‪

  1. Check for active codes.
    1. If fault codes 100 01 and 100 03 are both active, refer to "7.2.3 100 03 – Oil Combination Sensor Open Circuit" .
    2. If fault codes 100 01 and 100 04 are both active, refer to "7.2.4 100 04 – Oil Combination Sensor Short to Ground"
    3. If only fault code 100 01 is active, go to step 2 .
  2. Observe the stability of the oil pressure.
    1. If the oil pressure is in normal operating range and stable, go to step 3 .
    2. If the oil pressure is fluctuating, go to step 4 .
  3. Check the oil level.
    1. If the oil level is high, refer to "7.2.1.1 Required Actions" .

      Note: An increase in the engine oil level indicates fuel may be leaking into the engine oil.

    2. If the engine oil level is low, fill oil to proper level. Erase fault code memory.
  4. Check the operation of the oil gage. If the oil gage readings are erratic, refer to "7.2.1.2 Required Action" .
  5. Check the condition of the oil pump suction pipe. If the pipe is loose or cracked, refer to "7.2.1.3 Required Action" .
  6. Check the condition of the oil pump drive and driven gears. If either gear is loose, refer to "7.2.1.4 Required Action" .
  7. Check for a faulty oil pressure relief valve. If the relief valve does not open at the set pressure or sticks open, refer to "7.2.1.5 Required Action" .
  8. If fault code 100 01 is still active, contact Detroit Diesel Technical Service Group.
Section 7.2.1.1
Required Actions

Perform the following steps to resolve a high oil level:‪

  1. Check for fuel entering into the engine oil system and repair as required.

    Note: An increase in the engine oil system level indicates fuel may be entering into the engine oil system.

  2. Change the engine oil.
  3. Erase the fault code memory.
Section 7.2.1.2
Required Action

Perform the following steps to resolve a faulty oil gage:‪

  1. Repair or replace the oil gage as required.
  2. Erase the fault code memory.
Section 7.2.1.3
Required Action

Perform the following steps to resolve a faulty oil pump suction pipe:‪

  1. If the suction pipe is cracked, replace it.
  2. If the suction pipe is loose, reinstall it.
  3. Erase the fault code memory.
Section 7.2.1.4
Required Action

Perform the following steps to resolve a loose drive or driven gear:‪

  1. Repair or replace loose gears as required.
  2. Erase the fault code memory.
Section 7.2.1.5
Required Action

Perform the following steps to resolve a faulty oil pressure relief valve:‪

  1. Repair or replace a faulty oil pressure relief valve as required.
  2. Erase the fault code memory.

Section 7.2.2
100 02 – Oil Combination Sensor Data Erratic

Perform the following steps to troubleshoot erratic data from the oil combination sensor:‪

  1. With the engine shut down, all oil drained into the oil pan, and the vehicle on a level surface, check the oil level.
    1. If the oil level is not within the “normal” operating range on the dipstick, add the recommended oil to bring it to the proper level. Erase fault code memory.
    2. If the oil level is within the “normal” operating range on the dipstick, go to step 2 .
  2. Check for additional active fault codes.
    1. If fault code 100 03 is active in addition to code 100 02, refer to "7.2.3 100 03 – Oil Combination Sensor Open Circuit" .
    2. If fault code 100 04 is active in addition to code 100 02, refer to "7.2.4 100 04 – Oil Combination Sensor Short to Ground" .
    3. If only fault code 100 02 is active, check and clean sensor contacts (remove any corrosion). See Figure "Oil Combination Sensor Wiring" . Erase fault code memory.
    4. Click to see this graphic in a separate window

      Figure 3. Oil Combination Sensor Wiring

Section 7.2.3
100 03 – Oil Combination Sensor Open Circuit

Perform the following steps to troubleshoot an oil combination sensor open circuit fault:‪

  1. Check for additional active fault codes with combination sensor connected.
    1. If fault code 175 03 is active in addition to code 100 03, repair open circuit in 55-pin connector wire 15 to pin 1 of the sensor. See Figure "Oil Combination Sensor Wiring" . Erase fault code memory.
    2. If only fault 100 03 is active, go to step 2 .
  2. Bridge pins 1 and 4 of the combination sensor. See Figure "Oil Combination Sensor Wiring" .
    1. If new fault 100 04 is active, repair short to power in 55-pin connector wire 32 to pin 4 of the sensor. Erase fault code memory.
    2. If new fault 100 04 is not active, repair open circuit in 55-pin connector wire 32 to pin 4 of the connector. Erase fault code memory.

Section 7.2.4
100 04 – Oil Combination Sensor Short to Ground

Perform the following steps to troubleshoot an oil combination sensor short-to-ground fault:‪

  1. Unplug the oil combination sensor and check for active fault codes
    1. If new fault codes 175 03 and 100 03 are active, replace the combination sensor. Erase fault code memory.
    2. If new fault code 175 03 is active in addition to code 100 04, go to step 2 .
  2. Measure the resistance between pins 1 and 3 on the combination sensor. See Figure "Oil Combination Sensor Wiring" .
    1. If resistance is less than 30 kΩ, repair short circuit between 55-pin connector wires 15 and 6. Erase fault code memory.
    2. If resistance is more than 30 kΩ, go to step 3 .
  3. Measure the resistance between pin 4 on the combination sensor and vehicle ground. See Figure "Oil Combination Sensor Wiring" .
    1. If resistance is less than 30 kΩ, repair short to ground in 55-pin connector wire 32 to pin 4 of the combination sensor. Erase fault code memory.
    2. If resistance is more than 30 kΩ, go to step 4 .
  4. Measure the resistance between pin 3 on the combination sensor and vehicle ground. See Figure "Oil Combination Sensor Wiring" .
    1. If resistance is less than 30 kΩ, repair short to ground in 55-pin connector wire 6 to pin 3 of the combination sensor. Erase fault code memory.
    2. If resistance is more than 30 kΩ, go to step 5 .
  5. Check and clean contacts (remove any corrosion), then check for active codes.
    1. If fault 100 04 is still active, contact Detroit Diesel Technical Service for authorization to replace the PLD-MR. Set parameters on the new PLD-MR.
    2. If fault 100 04 is not active, erase fault code memory.

Section 7.2.5
100 14 – Oil Pressure Very Low

Perform the following steps to troubleshoot an oil pressure very low fault:‪

  1. Check for additional active fault codes.
    1. If fault code 100 03 is active in addition to code 100 04, refer to "7.2.3 100 03 – Oil Combination Sensor Open Circuit" .
    2. If fault code 100 04 is active in addition to code 100 04, refer to "7.2.4 100 04 – Oil Combination Sensor Short to Ground" .
    3. If only fault code 100 14 is active, go to step 2 .
  2. Start engine and check oil pressure.
    1. If pressure is fluctuating, go to step 3 .
    2. If pressure is low but stable, go to step 4 .
  3. Stop the engine and allow sufficient time for the oil to drain into the oil pan. Perform the following steps:
    1. Check the oil level. Add recommended oil to bring it to the proper level, if required.
    2. Check for faulty oil gage. Replace, if required.
    3. Check for loose or cracked oil pump suction pipe. Repair or replace, as required.
    4. Check for loose drive or driven oil pump gear. Repair or replace, as required.
    5. Check for faulty oil pressure relief valve. Repair or replace, as required.
    6. Erase fault code memory.
  4. Stop the engine and allow sufficient time for the oil to drain into the oil pan. Check the oil level.
    1. If oil is above maximum level with no oil previously added, go to step 5 .
    2. If oil is not above maximum level, contact Detroit Diesel Technical Service.
  5. Check for possible fuel in oil.
    1. If fuel is found, locate and repair source of fuel leak. Change the Oil. Erase fault code memory.
    2. If fuel is not found, contact Detroit Diesel Technical Service.


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

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