P3176
DTC P3176-863 Transmission Oil Pump Motor Coil Temperature Sensor Circuit LowDESCRIPTION
DTC Detection Condition:
The resistance of the temperature sensor (thermistor) installed in the oil pump motor changes in accordance with changes in the oil pump motor temperature. The lower the oil pump motor temperature, the more the temperature sensor (thermistor) resistance. Conversely, the more the temperature, the lower the resistance. The oil pump motor temperature sensor (thermistor) is connected to the hybrid vehicle control ECU. Power source voltage of 5 V is supplied to the oil pump motor temperature sensor (thermistor) through terminal TOPM of the hybrid vehicle control ECU. This means that resistor R in the ECU and the oil pump motor temperature sensor (thermistor) are connected in series. The potential at terminal TOPM and the resistance value change in accordance with changes in the oil pump motor temperature.
Wiring Diagram:
Step 1-2:
Step 2(Continued)-3:
Step 4:
INSPECTION PROCEDURE
CAUTION:
- Before inspecting the high-voltage system or disconnecting the low voltage connector of the inverter with converter assembly, take safety precautions such as wearing insulated gloves and removing the service plug grip to prevent electrical shocks. After removing the service plug grip, put it in your pocket to prevent other technicians from accidentally reconnecting it while you are working on the high-voltage system.
- After disconnecting the service plug grip, wait for at least 10 minutes before touching any of the high-voltage connectors or terminals. After waiting, check the voltage at the inspection point in the inverter with converter assembly. The voltage should be 0 V before beginning work.
HINT: Waiting for at least 10 minutes is required to discharge the high-voltage capacitor inside the inverter with converter assembly.