P1AE5
DTC P1AE5
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 Descriptor
DTC P1AE5
- Battery Energy Control Module Hybrid Battery Power Off Circuit
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 the communication circuit. The drive motor generator control module is the host controller for diagnostic trouble code (DTC) information.
The drive motor generator battery control module receives a pulse width modulated (PWM) signal from the drive motor generator control module referred to as the contactor system request circuit command. The drive motor generator battery control module uses several methods, the primary is a serial data message and the secondary is a PWM signal to open and close the HV contactors. A 5 V circuit is provided from the drive motor generator battery control module to the drive motor generator control module. The drive motor generator control module uses a PWM signal on the 5 V circuit to control the contactor system request command signal. If this PWM signal becomes out of range or invalid, the system will use a redundant message to command the HV contactors Open and Closed.
Conditions for Running the DTC
* The ignition is ON.
* Accessory voltage is 9-18 V.
Conditions for Setting the DTC
* Contactor system request circuit command signal is less than 25 percent
* Contactor system request circuit command signal is between 35 percent and 65 percent
* Contactor system request circuit command signal is greater than 75 percent
* The frequency of the contactor system request circuit command signal is not between 240 Hz to 260 Hz for 2 out of 3 seconds.
Action Taken When the DTC Sets
* DTC P1AE5 is a Type C DTC.
* The driver information center displays the SERVICE HYBRID SYSTEM message.
Conditions for Clearing the DTC
DTC P1AE5 is a Type C DTC.
Diagnostic Aids
* The drive motor generator battery control module will set contactor status to OPEN when the percent duty cycle is 65-75 percent.
* The drive motor generator battery control module will set contactor status to CLOSED when the percent duty cycle is 25-35 percent.
* The frequency of the PWM signal must be between 240 Hz to 260 Hz to be valid.
Reference Information
Schematic Reference
* Hybrid Controls Schematics (Electrical Diagrams)
* Hybrid Energy Storage Schematics (Electrical Diagrams)
Connector End View Reference
Component Connector End Views (Connector Views)
Description and Operation
* Drive Motor Generator Battery Description (Drive Motor Generator Battery Identification Information)
* High Voltage Monitoring Systems Description (High Voltage Monitoring Systems 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 Contactor System Request Circuit Command parameter. The parameter should be 30 percent.
2. Operate the vehicle within the conditions for running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the freeze frame/failure records data.
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. Verify that DTC P1A1F is not set.
• If the DTC is set, refer to DTC P1A1F or P1A4E (P1A1F).
2. Ignition OFF, disconnect the X1 harness connector at the drive motor generator power inverter module assembly (PIM).
3. Ignition ON, verify that the scan tool Contactor System Request Circuit Command parameter indicates 100 percent.
• If not the specified value, test the control circuit terminal 4 for a short to ground. If the circuit tests normal, replace the drive motor generator battery control module.
4. Connect a 3 A fused jumper wire between the control circuit terminal 4 and ground. Verify that the scan tool Contactor System Request Circuit Command parameter indicates 0 percent.
• If not the specified value, test the control circuit for an open or short to voltage. If the circuit tests normal, replace the drive motor generator battery control module.
5. If all circuits test normal, replace the drive motor generator power inverter module assembly (PIM).
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the repair.
Control Module References (Programming and Relearning) for drive motor generator battery control module or drive motor generator power inverter module assembly replacement, setup and programming