Diagnostic Instructions
DTC Descriptor
DTC P0A35: Drive Motor 2 Overtemperature
Circuit/System Description
The transmission contains two electric motor generators. The drive motor generators are cooled by the transmission fluid. Hot fluid exits the drive motor generator housing and flows to the transmission cooler supply line. The supply line connects to the
cooler. From the cooler, the fluid returns through the oil cooler return line and enters the lubrication circuits. After lubricating the internal components, the fluid returns to the oil pan. A non-serviceable motor temperature sensor (MTS) is located
in each drive motor generator assembly.
Conditions for Running the DTC
DTC P0A31 is not set.
Conditions for Setting the DTC
The MTS is greater than 200°C (392°F) for 3 seconds, and has not fallen below 135°C (275°F).
Action Taken When the DTC Sets
• | DTC P0A35 is a Type B DTC. |
• | The hybrid powertrain control module (HPCM) commands the battery energy control module (BECM) to open the high voltage contactor relays. |
Conditions for Clearing the DTC
DTC P0A35 is a Type B DTC.
Diagnostic Aids
• | The driver information center (DIC), if equipped, will display 'TRANSMISSION HOT- Idle Engine' when the transmission fluid temperature (TFT) is more than 132°C (270°F) for 10 minutes. |
• | Ask about the customer's driving habits, trailer towing, etc. |
• | Ensure the engine cooling system is functioning normally. |
• | The HPCM will reduce drive motor generator torque at temperatures greater than 160°C (320°F). Drive motor generator torque is reduced to zero if the temperature reaches 190°C (374°F). |
Reference Information
Schematic Reference
Hybrid Controls Schematics
Connector End View Reference
Component Connector End Views
Electrical Information Reference
Scan Tool Reference
Control Module References
for scan tool information
Circuit/System Verification
- Review the Failure Records when the DTC set.
⇒ | If the engine coolant temperature (ECT) was above 125°C (257°F) when the DTC set, go to
Symptoms - Engine Cooling
and correct that concern first. |
- Perform the
Transmission Fluid Cooler Flushing and Flow Test
.
Circuit/System Testing
- Review the Failure Records when the DTC set.
- Compare the MTS values for each drive motor generator.
⇒ | If both MTS values were not at or near 200°C (392°F) , test the MTS signal circuit for a low resistance to ground condition. |
⇒ | If the circuit tests normal, replace the motor temperature sensor. |
- Inspect the transmission cooling system for restrictions or damage.
⇒ | If a concern is found, repair or replace the restricted or damaged components as necessary. |
- Perform the
Transmission Fluid Cooler Flushing and Flow Test
.
⇒ | If a concern is found, repair or replace the damaged components as necessary. |
- Perform the automatic transmission
Line Pressure Check
.
⇒ | If a concern is found repair or replace the damaged components as necessary. |
Component Testing
Repair Instructions
Perform the
Diagnostic Repair Verification
after completing the diagnostic procedure.