• | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
• | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
• | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
---|---|---|---|---|
Motor Temperature Sensor Signal | P0A2C, P0A32 | P0A2D, P0A33 | P0A2D, P0A33 | P0A2B, P0A31 |
Motor Temperature Sensor Low Reference | -- | P0A2D, P0A33 | -- | P0A2B, P0A31 |
Circuit | Short to Ground | Open | Short to Voltage |
---|---|---|---|
Operating Conditions: Ignition ON Parameter Normal Range: 0.29V to 4.43V | |||
Motor Temperature Signal | 0.00V | 4.45V | Sensor Damage Possible |
Motor Temperature Sensor Low Reference | -- | 4.45V | -- |
The motor temperature sensor (MTS) is a non-serviceable part of the drive motor generator assembly. The MTS sensor is a thermistor, or a resistor that changes value when the temperature changes. The sensor has a negative-temperature coefficient. This means that as the temperature increases, the resistance decreases, and as the temperature decreases, the resistance increases. The motor control module (MCM) supplies about a 5-volt reference signal to the sensor and measures the voltage drop in the circuit. When the motor is cold, the sensor resistance is high and the MCM detects high signal voltage. As the motor temperature increases, the resistance of the sensor decreases, which lowers the signal voltage.
• | DTCs P0A2C, P0A2D, P0AEF, P0AF0, P0BD3, P0BD4, P0BDD, P0BDE are not set. |
• | Ignition ON after the engine has been OFF for at least 6 hours. |
• | Average of phase U, V, W inverter temperatures is greater than -12°C (+10°F). |
• | Motor temperature is greater than -40°C (-40°F). |
The ignition is ON.
• | The average of the three motor phase sensor temperatures and the motor temperature are not within 28°C (50°F) of each other at ignition ON. |
• | The DTC sets within 3 seconds when the above condition is met. |
• | Motor temperature sensor signal is less than 0.29V. |
• | The DTC sets within 3 seconds when the above condition is met. |
Motor temperature sensor signal is greater than 4.42V.
⇒ | If this condition is observed at Ignition ON, the drive motor generator must operate at greater than 20 N·m (14.75 lb ft) of torque for a cumulative time of 1.5 minutes before the DTC will set. |
⇒ | If this condition is observed after Ignition ON, the DTC will set within 3 seconds when the above condition is met. |
• | DTCs P0A2B-P0A2D, P0A31-P0A33 are Type B DTCs. |
• | The HPCM commands the SERVICE HYBRID SYSTEM message to display on the instrument panel. |
DTCs P0A2B-P0A2D, P0A31-P0A33 are Type B DTCs.
• | The motor temperature sensor can be damaged by excessive electric current. Test the sensor for an open condition whenever a short to voltage condition is observed. |
• | Test the X176 transmission 24-way connector for proper terminal contact whenever an open or high resistance circuit condition is observed. |
• | The HPCM motor temperature scan tool parameter display will default to 120°C (248°F) whenever an open or shorted signal circuit is observed. |
Drive Motor Generator Control Module Description and Operation
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Control Module References for scan tool information
DT-48493 Jumper Harness, 24 terminal
⇒ | The Motor 1 Temperature, Motor 2 Temperature, and phase U, V, W inverter temperature parameters should be within 28°C (50°F) of each other and ambient temperature. |
Ignition ON, observe the MCM motor temperature scan tool parameter.
⇒ | The motor temperature parameter should be between 0.29V and 4.42V. |
Important: The ignition must be ON to test the low reference circuit. Other DTCs will set with the X176 connector disconnected.
⇒ | If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the PIM. |
⇒ | If less than the specified value, test the signal circuit for a short to ground. If the circuit tests normal, replace the PIM. |
Important: If a short to voltage is found, test the motor temperature sensor for damage.
⇒ | If greater than the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the PIM. |
⇒ | If the resistance is near the expected value, test the transmission internal harness signal circuit for a short to ground. If the circuit tests normal, replace the drive motor w/generator. |
⇒ | If the resistance is not near the expected value, test the transmission internal harness signal and low reference circuits for an open or shorted together condition. If the circuits test normal, replace the drive motor w/generator. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
• | Control Module References for PIM replacement, setup, and programming |