P0AAF
DTC P0AAD-P0AAF
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.
DTC Descriptors
DTC P0AAD
-
Hybrid Battery Pack Air Temperature Sensor Performance
DTC P0AAE
-
Hybrid Battery Pack Air Temperature Sensor 1 Circuit Low Voltage
DTC P0AAF
-
Hybrid Battery Pack Air Temperature Sensor 1 Circuit High Voltage
Circuit/System Description
The battery energy control module monitors an inlet air temperature sensor that is located at the inlet of the hybrid/EV battery pack. This temperature sensor is a variable resistor that measures the air temperature of the incoming air which is used to heat and cool the hybrid/EV battery sections and the internal electronics of the starter/generator control module. The battery energy control module supplies 5 V to the signal circuit and a ground for the low reference circuit. The inlet air temperature sensor resistance changes with temperature of the incoming inlet air. As the temperature decreases, the sensor resistance increases. As the temperature increases, the sensor resistance decreases. The starter/generator control module will control the hybrid/EV battery pack cooling fan based on the inlet air temperature and hybrid/EV battery temperature sensors.
The starter/generator control module performs a rationality diagnostic that compares the air Inlet temperature sensor output signal to the average battery temperature of the six battery cell temperature sensors. This diagnostic gets one chance to run during a drive cycle after a specific vehicle OFF time.
Conditions for Running the DTC
P0AAD
* Ignition is RUN or CRANK
* Starter/generator control module off time is greater than 6 hours
* Starter/generator control module off time is not faulted (starter/generator control module internal clock diagnostic)
* None of the following DTCs are set: P0AAE, P0AAF, P0A9C, P0A9D, P0A9E, P0AC6, P0AC7, P0AC8, P0ACB, P0ACC, P0ACD, P0AEA, P0AEB, P0BC3, P0BC4, P0BC5, P0C34, P0C35, P0C36, P262B, U0100, U182A
P0AAE and P0AAF
* Ignition OFF
* The 12 V battery voltage is greater than 8.8 V.
* DTC P1A5D is not set
Conditions for Setting the DTC
P0AAD
The air inlet temperature is more than 10°C (18°F) higher or lower than the average battery cell temperature
P0AAE
The air temperature sensor signal is greater than 87°C (188.6°F)
P0AAF
The air temperature sensor signal is less than -39°C (-38.2°F)
Action Taken When the DTC Sets
DTCs P0AAD, P0AAE, and P0AAF are type B DTCs
Conditions for Clearing the DTC
DTCs P0AAD, P0AAE, and P0AAF are type B DTCs
Reference Information
Schematic Reference
Hybrid Cooling Schematics Hybrid Cooling Schematics
Connector End View Reference
Component Connector End Views Connector End Views By Name
Description and Operation
Hybrid Cooling System Description and Operation Hybrid Cooling System Description and Operation
Electrical Information Reference
* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References Programming and Relearning for scan tool information
Special Tools
EL-48900 - HEV Safety Kit
For equivalent regional tools, refer to Special Tools Tools and Equipment.
Circuit/System Verification
Ignition ON, observe the scan tool battery energy control module Hybrid Battery Inlet Air Temperature parameter. The parameter should be between within 40°C (72°F) of the average battery cell temperature.
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.
Before working on any high voltage system, be sure to wear the following Personal Protection Equipment:
* Safety glasses with appropriate side shields when within 15 meters (50 feet) of the vehicle, either indoors or outdoors.
* Certified and up-to-date Class "0" Insulation gloves rated at 1000V with leather protectors.
- Visually and functionally inspect the gloves before use.
- Wear the Insulation gloves with leather protectors at all times when working with the high voltage battery assembly, whether the system is energized or not.
Failure to follow the procedures exactly as written may result in serious injury or death.
Danger:
The eAssist battery pack assembly will utilize an exchange program. Please consult the most recent revision of bulletin/PI# PIC5520, available in Service Information♦(SI), for a list of approved eAssist battery pack assembly service procedures. Components that may be removed and serviced without exchanging the complete battery pack assembly are identified in the bulletin/PI. Please contact the GM Technical Assistance Center (1-877-446-8227) if you have any questions.
Note:
In High Voltage Disabling High Voltage Disabling , perform the disabling procedure for servicing components within the A4 hybrid/EV battery pack. The C4A hybrid/EV battery section 1 and C4B hybrid/EV battery section 2 will be disconnected as part of the disabling procedure.
1. Ignition OFF, disable the high voltage at the A4 hybrid/EV battery pack. Refer to High Voltage Disabling High Voltage Disabling.
2. Disconnect the X2 harness connector at the K16 battery energy control module.
3. Test for 8-13k ohms at 22°C (71.6°F) between the signal circuit terminal 3 and the low reference circuit terminal 8.
• If not between 8-13k ohms
1. Inspect the signal circuit and low reference circuit for a short to voltage, short to ground, or an open/high resistance.
• If a short to voltage, short to ground, or an open/high resistance is found, attempt to repair the circuit. If a repair cannot be made, replace the C4A hybrid/EV battery section 1 and C4B hybrid/EV battery section 2.
• If a short to voltage, short to ground, or an open/high resistance is not found
2. Replace the C4A hybrid/EV battery section 1 and C4B hybrid/EV battery section 2.
• If between 8-13k ohms
4. Replace the K16 battery energy control module.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the repair.
* Generator Battery Replacement Generator Battery Replacement
* Control Module References Programming and Relearning for battery energy control module replacement, programming, and setup