P0AAE
DTC P0AAD-P0AAF
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview) provides an overview of each diagnostic category.
DTC Descriptors
DTC P0AAD
- Hybrid Battery Pack Air Temperature Sensor A Range/Performance
DTC P0AAE
- Hybrid Battery Pack Air Temperature Sensor A Circuit Low
DTC P0AAF
- Hybrid Battery Pack Air Temperature Sensor A Circuit High
Diagnostic Fault Information
Typical Scan Tool Data
Circuit/System Description
The drive motor generator battery control module will diagnose its own systems and determine when a fault condition is present. Diagnostics and system status is communicated from the drive motor generator battery control module to the drive motor generator control module through serial data. The drive motor generator control module is the host controller for diagnostic trouble code (DTC) information.
The drive motor generator battery assembly has an air inlet temperature sensor. The air inlet sensor is located on the inlet air ducts of the drive motor generator battery assembly. The air temperature sensor is a variable resistor that measures the temperature of the inlet air. The control module supplies 5 V to the signal circuit and a ground for the low reference circuit. The air inlet temperature sensor resistance changes with temperature. The lower the temperature, the higher the resistance of the sensor. The higher the temperature, the lower the resistance of the sensor. The drive motor generator battery control module uses the air inlet temperature sensor to determine if air is circulating through the drive motor generator battery assembly.
Conditions for Running the DTC
* The ignition is ON.
* The 12 V battery voltage is 9-18 V.
Conditions for Setting the DTC
P0AAF
The hybrid battery pack air inlet temperature sensor is less than -40°C (-40°F).
P0AAE
The hybrid battery pack air inlet temperature sensor is greater than 85°C (185°F).
P0AAD
The drive motor generator battery control module compares the air inlet temperature sensor to the engine control modules intake air temperature (IAT) sensor, once at engine start up.
Action Taken When the DTC Sets
* DTCs P0AAD, P0AAE and P0AAF are type B DTCs.
* The drive motor generator battery control module sends a serial data message to the drive motor generator control module to reduce the power by 50 percent.
Conditions for Clearing the DTC
DTCs P0AAD, P0AAE and P0AAF are type B DTCs.
Diagnostic Aids
* Battery temperatures can be affected by vehicle load, outside temperature and customer driving conditions. Test drive the vehicle, and attempt to simulate the Freeze Frame/Failure Record conditions this DTC set under.
* An open 5 V reference or ground circuit will have a default scan tool reading of 214°C and 4.99 V.
Reference Information
Schematic Reference
Hybrid Cooling Schematics (Electrical Diagrams)
Connector End View Reference
Component Connector End Views (Connector Views)
Description and Operation
Drive Motor Generator Battery Cooling Description (Drive Motor Generator Battery Cooling Description)
Electrical Information Reference
* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions (Diagnostic Trouble Code Descriptions)
Scan Tool Reference
Control Module References (Programming and Relearning) for scan tool information
Special Tools
EL-48900 HEV Safety Kit
Circuit/System Verification
1. Ignition ON, observe the scan tool Hybrid Battery Air Inlet Temperature parameter. The hybrid battery inlet air temperature should be between -40 and +85°C (-40 and +185°F).
2. Ignition ON, using a scan tool, command the drive motor battery coolant fan ON and let it run for 2 minutes. The parameter should change.
Circuit/System Testing
Danger: Always perform the High Voltage Disabling procedure prior to servicing any High Voltage component or connection. Personal Protection Equipment (PPE) and proper procedures must be followed.
The High Voltage Disabling procedure will perform the following tasks:
* Identify how to disable high voltage.
* Identify how to test for the presence of high voltage.
* Identify condition under which high voltage is always present and personal protection equipment (PPE) and proper procedures must be followed.
Failure to follow the procedures exactly as written may result in serious injury or death.
1. Inspect the inlet air vents for any obstructions or blockages that are external to the drive motor generator battery.
• If inlet air obstructions or blockages are found, remove or repair as needed.
2. Inspect the vent fan for any damage to the fan blades.
• If fan or blades are damaged, replace the drive motor generator battery assembly.
3. Ignition OFF, disable the high voltage at the drive motor generator battery. Refer to High Voltage Disabling (High Voltage Disabling).
4. Ignition OFF, connect the 12 V battery.
5. Ignition ON, command the hybrid battery coolant fan speed through the speed ranges using a scan tool. Verify the drive motor battery coolant fan is functional in all speed ranges.
• If the fan does not operate, refer to DTC P0A81 (P0A81).
6. Ignition OFF, disconnect the X 456 inline harness connector at the side drive motor generator battery assembly.
7. Ignition OFF, test for less than 5 ohm between low reference circuit terminal E and ground.
• If greater than the specified range, test the ground circuit for an open/high resistance. If the circuits test normal, replace the drive motor generator battery control module.
8. Ignition ON, test for 4.8-5.2 V between the signal circuit terminal D and low reference circuit terminal E.
• If not with the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuits test normal, replace the drive motor generator battery control module.
9. If all circuits test normal, replace the drive motor generator battery assembly.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the repair.
* Drive Motor Battery Coolant Cooler Replacement (Drive Motor Battery Coolant Cooler Replacement)
* Drive Motor Generator Battery Replacement (Drive Motor Generator Battery Control Module and Bracket Replacement)
* Control Module References (Programming and Relearning) for drive motor generator battery control module replacement, setup and programming