P0ADC
DTC P0ADC
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 P0ADC
- Hybrid Battery Positive Contactor Control Circuit High
Diagnostic Fault Information
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 contains 2 high voltage (HV) contactors and a current limit relay. The contactors allow the high voltage DC batteries to be connected to the vehicle or safely contain the DC high voltage within the drive motor generator battery assembly. The two contactors are a positive HV contactor, negative HV contactor, and current limit relay. These contactors close and open in sequence and are controlled by the drive motor generator battery control module. The control circuit for the contactors use a buss bar attached to the circuit board and the drive motor generator battery control module supplies a ground to turn them on and off individually. The drive motor generator battery control module monitors the control circuit voltage to these contactors and 12 V reference circuit internal to the control module to determine if the circuit is open by comparing the two voltage readings. If the drive motor generator battery control module detects 2 consecutive failed high voltage precharge events, a precharge wait time is activated by the drive motor generator battery control module. This precharge wait time limit is to allow the precharge circuit internal to the drive motor generator battery assembly to cool down. The precharge wait time counts down in seconds and is displayed on the scan tool.
Conditions for Running the DTC
* Accessory voltage is 9-18 V.
* HV contactors are commanded to open.
Conditions for Setting the DTC
Control circuit current is greater than 12 A for 20 ms.
Action Taken When the DTC Sets
DTC P0ADC is a type C DTC.
Conditions for Clearing the DTC
DTC P0ADC is a type C DTC.
Reference Information
Schematic Reference
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)
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, clear the DTC.
2. Ignition OFF, wait 30 seconds.
3. Ignition ON, with a scan tool command the HV negative contactor open and closed several times and listen for audible clicks.
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. Ignition OFF, disable the high voltage at the drive motor generator battery. Refer to High Voltage Disabling (High Voltage Disabling).
2. Disconnect the X4 harness connector at the drive motor generator battery disconnect control module.
3. Connect the 12 V battery.
4. Ignition ON, verify a test lamp illuminates between the B+ circuit terminal 7 and ground.
• If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the drive motor generator battery control module.
5. Ignition OFF, connect a test lamp between the B+ circuit terminal 7 and the control circuit terminal 8.
6. Ignition ON, with a scan tool command the HV positive contactor open and closed several times. The test lamp should turn ON and OFF when changing between the commanded states.
• If the test lamp is always OFF, test the control circuit for an open/high resistance. If the circuit tests normal, replace the drive motor generator battery disconnect control module.
• If the test lamp is always ON, test the control circuit for an short to ground. If the circuit tests normal, replace the drive motor generator battery disconnect control module.
7. If all circuits test normal, replace the drive motor generator battery control module.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the repair.
* Drive Motor Battery Disconnect Control Module Replacement (Drive Motor Battery Disconnect Control Module Replacement)
* Control Module References (Programming and Relearning) for drive motor generator battery control module replacement, setup and programming