MBE 900/4000 PID 175 Troubleshooting

Troubleshooting PID 175

The engine oil combination sensor monitors engine oil temperature and engine oil pressure. The sensor is installed in the front of the base of the oil filter for the MBE 900 engines (see Figure “Location of Engine Oil Combination Sensor on the MBE 900 Engine” ) and at the front of the heat exchanger housing for the MBE 4000 engines (see Figure “Location of Engine Oil Combination Sensor on the MBE 4000 Engine” ). The following procedure will troubleshoot PID 175.‪

Figure 1. Location of Engine Oil Combination Sensor on the MBE 900 Engine

Figure 2. Location of Engine Oil Combination Sensor on the MBE 4000 Engine

175 03 – Engine Oil Temperature Open Circuit

Perform the following steps to troubleshoot an engine oil temperature open circuit fault:‪

1. If fault 100 03 is active in addition to fault 175 03 with oil combination sensor connected, resolve as follows:
   1. Repair open circuit in wire between pin 15 of 55-pin connector and pin 1 of the oil combination sensor. See Figure “Engine Oil Combination Sensor Wiring Harness Connections” .
      

      Figure 3. Engine Oil Combination Sensor Wiring Harness Connections

   2. Erase fault code memory.
2. If fault 174 03 is active in addition to fault 175 03 with oil combination sensor connected, go to step 4 .
3. If only fault 175 03 is active with oil combination sensor connected, go to step 5 .
4. Measure the voltage at pin 2 of the oil combination sensor connector. See Figure “Location of Pins on Engine Oil Combination Sensor” .
   1. If the voltage is above 10 volts, refer to “16.2.1.2 Required Action“ .
   2. If the voltage is below 10 volts, go to step 6 .
5. Bridge pins 1 and 2 of the oil combination sensor connector.
   1. If new fault 175 04 is active after bridging pins, go to step 7 .
   2. If new fault 175 04 is not active after bridging pins, refer to “16.2.1.3 Required Action” .
6. Measure the voltage at pin 1 of the oil combination sensor connector.
   1. If the voltage is below 4.5 volts, inspect all plug connectors and repair or replace, as required. Erase fault code memory.
   2. If the voltage is above 4.5 volts, refer to “16.2.1.4 Required Action” .
7. Bridge pins 1 and 2 of the oil combination sensor connector.
   1. If new fault 100 04 is not active after bridging pins, refer to “16.2.1.1 Required Action” .
   2. If new fault 100 04 is active after bridging pins, refer to “16.2.1.2 Required Action” .

Figure 4. Location of Pins on Engine Oil Combination Sensor

Section 16.2.1.1
Required Action

Perform the following steps to resolve an engine oil temperature open circuit fault:‪

1. Replace oil combination sensor.
2. Erase fault code memory.

Section 16.2.1.2
Required Action

Perform the following steps to resolve an engine oil temperature open circuit fault:‪

1. Repair short to power in wire between pin 39 of the 55-pin connector and pin 2 of the oil combination sensor connector.
2. Erase fault code memory.

Section 16.2.1.3
Required Action

Perform the following steps to resolve an engine oil temperature open circuit fault:‪

1. Repair open circuit in wire between pin 39 of the 55-pin connector and pin 2 of the oil combination sensor.
2. Erase fault code memory.

Section 16.2.1.4
Required Action

Perform the following steps to resolve an engine oil temperature open circuit fault:‪

1. Repair short to power in wire between pin 36 of the 55-pin connector and pin 1 of the oil combination sensor connector.
2. Erase fault code memory.

175 04 – Engine Oil Temperature Short to Ground

Perform the following steps to troubleshoot an engine oil temperature short to ground fault:‪

1. Unplug the engine oil combination sensor.
   1. If new fault 175 03 is not active after unplugging sensor, go to step 2 .
   2. If new fault 175 03 is active after unplugging sensor, replace oil combination sensor. Erase fault code memory.
2. Measure the resistance between pin 2 on the engine oil combination sensor and ground.
   1. If resistance is less than 30 kΩ, repair short to ground in 55-pin connector wire 39 to pin 2 on sensor connector. Erase fault code memory.
   2. If resistance is more than 30 kΩ, go to step 3 .
3. Clean and check contacts.
   1. If fault 175 04 is still active after cleaning and checking contacts, contact Detroit Diesel Technical Service for authorization to replace the PLD-MR. Set parameters on new PLD-MR.
   2. If fault 175 04 is not active after cleaning and checking the contacts, erase fault code memory.