Volvo All Engines (2004 Emissions) Fault Code: PID 175 FMI 4 Engine Oil Temperature / Temperature Sensor

Fault Condition: The Electronic Malfunction Lamp (EML) will turn on and PID 175 will set if the engine oil temperature signal voltage is less than .17 volts or greater than 4.92 volts. If the EMS Module senses that the engine oil temperature signal is critically above range, FMI code 0 will be set. If the engine oil temperature reaches 259°F (126°C), the engine power will be reduced by 15%. If the engine oil temperature reaches 262°F (128°C), the engine will be shutdown. Yellow or red warning lamp identification and buzzer warning will accompany the extreme engine oil temperature conditions. If the reference voltage signal is shorted to ground FMI 4 will be set. If the reference voltage circuit is shorted to battery voltage or has an open circuit, FMI 5 will be set. If the ground circuit of the sensor has an open, FMI 5 will also be set.

Possible repairs:

Turn the ignition key OFF first.

1) Disconnect the Engine Oil Level/Temperature Sensor connector. Check for continuity between pin 1 of the Engine Oil Temperature/Level Sensor and a good ground. Check for continuity between pin 2 of the Engine Oil Temperature/Level Sensor and a good ground. Check for continuity between pin 3 of the Engine Oil Temperature/Level Sensor and a good ground. Check for continuity between pin 4 of the Engine Oil Temperature/Level Sensor and a good ground. If continuity exists between any of the pins and ground, replace the Engine Oil Level/Temperature Sensor.
2) Disconnect the Engine Oil Level/Temperature Sensor connector. Measure the resistance across the pins 3 and 4 of the Engine Oil Temperature/Level Sensor. If the resistance of the sensor is NOT as specified, replace the replace the Engine Oil Level/Temperature Sensor.
3) Disconnect the Engine Oil Level/Temperature Sensor harness connector. Turn the ignition key ON. Measure voltage between Engine Oil Level/Temperature Sensor harness connector pin 3 and a good ground.
If the measured voltage is more than 4.5 volts, verify the diagnostic code, the FMI and retest. If FMI 4 is still active, replace the Engine Management System (EMS) Module and retest the system.
4) Disconnect the Engine Oil Level/Temperature Sensor harness connector. Disconnect the EMS Module harness connector A. Measure continuity between Engine Oil Level/Temperature Sensor harness connector pin 3 and a good ground. If continuity exists, repair the short to ground between in the signal line voltage circuit. If there is NO continuity, check the pins or the EMS Module for dirt, loose pins or deformed contacts. Replace the EMS Module if the pins of the module are not damaged. Retest the system.
5) Disconnect the Engine Oil Level/Temperature Sensor harness connector. Disconnect the EMS Module harness connector A. Turn the ignition key ON. Measure voltage between Engine Oil Level/Temperature Sensor harness
connector pin 3 and a good ground. If the there is voltage present, repair the short to voltage on the signal line.
6) Disconnect the Engine Oil Level/Temperature Sensor connector. Disconnect connector A from the EMS Module. Check for continuity between connector A pin 11 and/or 31 of the EMS Module harness connector and pin 3 of the Engine Oil Level/Temperature Sensor harness connector. If there is NO continuity, locate and repair the open in the circuit between the Engine Oil Level/Temperature Sensor and the EMS Module.
7) Visually inspect the EMS Module harness connectors A and B for dirt, loose pins or deformed contacts. If a repairable open is found or any of the pins feel loose, repair the EMS Module harness connector.
If an open is not found and the EMS Module harness connector has a good contact, verify the diagnostic code, the FMI and retest. If FMI 5 is still active, replace the Engine Management System (EMS) Module and retest the system.