P0ADC
DTC P0ADB or P0ADC
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview
* Review Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions provides an overview of each diagnostic category.
DTC Descriptor
DTC P0ADB
- Hybrid Battery Main Positive Contactor Control Circuit Low Voltage
DTC P0ADC
- Hybrid Battery Main Positive Contactor Control Circuit High Voltage
Diagnostic Fault Information
Typical Scan Tool Data
Circuit/System Description
The hybrid drive motor generator battery contains 3 high voltage contactors also referred to as relays that allow the high voltage (HV) DC batteries to be connected to the vehicle. The three HV relays are a positive HV relay, negative HV relay and pre-charge relay. These relays/contactors close and open in a certain sequence and are controlled by the battery energy control module (BECM). The control circuit for the relays use a common ground and the BECM supplies voltage to turn them on and off individually. The BECM monitors the control circuit voltage to these relays. The BECM compares the HV relay control circuit voltage to the 12 volt accessory input circuit.
Conditions for Running the DTC
P0ADB
* The vehicle power mode is RUN.
* Accessory voltage is 9-18 volts.
* Contactor commanded to ON.
P0ADC
* Accessory voltage is 9-18 volts.
* Contactor commanded to OFF.
Conditions for Setting the DTC
P0ADB
When the High Voltage contactor control circuit and is more than 2 volts under the 12 volt accessory input circuit voltage.
P0ADC
The BECM measures more than 2 volts on the High Voltage contactor control circuit is more than 2 volts when commanded OFF.
Action Taken When the DTC Sets
* The malfunction indicator lamp (MIL) is illuminated.
* The HVIL will be disabled and contactors will not close.
* DTCs P0ADB and P0ADC are Type B DTCs.
Conditions for Clearing the DTC
DTCs P0ADB and P0ADC are Type B DTCs.
Special Tools
* EL-48569 Terminal Covers
* EL-48900 HEV Safety Kit
Circuit/System Verification
1. Ignition ON, engine OFF, with a scan tool, command the high voltage positive contactor (HV pos contactor) ON and OFF several times. You should here the HV pos contactor click with each command.
2. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that are captured in 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.
Ignition OFF, disable the high voltage at the drive motor generator battery. Refer to High Voltage Disabling.
1. Remove the drive motor generator battery cover.
2. Connect the 12 volt battery.
3. Disconnect X7 at the HV pos contactor. Connect at test lamp between X7 terminal 1 and ground. The test lamp should not illuminate.
^ If the test lamp illuminates, test the control circuit for a short to voltage. If the circuit test normal, replace the BECM.
4. With a scan tool, command the HV pos contactor ON. The test lamp should turn ON.
^ If the test lamp fails to illuminate, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BECM.
5. Connect the test lamp between terminals 1 and 2 at X7.
6. With a scan tool, command the HV pos contactor ON. The test lamp should turn ON.
^ If the test lamp fails to illuminate, test the ground circuit for an open/high resistance.
7. Connect the X7 to the HV pos contactor.
8. Connect a DMM, across the high voltage contact side of HV pos contactor. With a scan tool, command the HV pos contactor ON. You should measure less than 0.5 ohms of resistance across the high voltage contact side.
^ If the resistance is greater than the specified value, replace the HV pos contactor.
Component 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.
Ignition OFF, disable the high voltage at the drive motor generator battery. Refer to High Voltage Disabling.
1. Remove the drive motor generator battery cover.
2. Disconnect X7 at the HV pos contactor.
3. With a DMM measure between 23-29 ohms at 20°C (68°F), across terminals 1 and 2 at X7 on the component harness.
^ If the value is not within the specified range, replace the HV pos contactor.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the repair. Verification Tests
* Drive Motor Battery Positive High Voltage Contactor Relay Replacement
* Drive Motor Generator Battery Control Module and Bracket Replacement