DTC P0D20, P0D22, P1EFA or P1EFB
Diagnostic Instructions
DTC Descriptors
DTC P0D20: Battery Charger Output Voltage Performance
DTC P0D22: Battery Charger Output Current Performance
DTC P1EFA: Battery Charger High-Voltage Converter 1 Input Current Too High
DTC P1EFB: Battery Charger High-Voltage Converter 2 Input Current Too High
Circuit/System Description
The hybrid/EV powertrain control module 2 monitors the battery charger high-voltage output and current output and ensures they are within the proper range. The battery charger operates in either a constant current mode or a constant voltage mode. Whichever mode you are in will determine which diagnostic will be run. The battery charger runs constant voltage mode at the beginning and end of the charge cycle and runs constant current mode most of the charging cycle.
Conditions for Running the DTC
P0D20
| • | The vehicle 12 V battery system voltage needs to be above 9 V. |
| • | Battery charger is charging and in constant voltage mode which only occurs under the following conditions: |
| - | During charging bus precharge. |
| - | When the hybrid/EV battery pack is close to being fully charged. |
| - | When the hybrid/EV battery pack is hot and the hybrid/EV battery pack cooling system is activated. |
P0D22
| • | The vehicle 12 V battery system voltage needs to be above 9 V. |
| • | Battery charger is charging and not in constant voltage mode |
| • | The hybrid/EV powertrain control module 2 measures a current output of greater than about 0.5 A |
P1EFA
| • | The vehicle 12 V battery system voltage needs to be above 9 V. |
| • | The vehicle is connected to a 120 V AC supply and battery charging is charging the high-voltage battery supply. |
P1EFB
| • | The vehicle 12 V battery system voltage needs to be above 9 V. |
| • | The vehicle is connected to a 240 V AC supply and battery charging is charging the high-voltage battery supply. |
Conditions for Setting the DTC
P0D20
The hybrid/EV powertrain control module 2 measures that the battery charging bus voltage is not within about 15 % of the commanded voltage for about 5 seconds.
P0D22
The hybrid/EV powertrain control module 2 measures that the battery charging bus current is not within an acceptable percentage of the commanded current for about 40 seconds.
P1EFA, P1EFB
The battery charger detects an internal over-current condition. This is an internal measurement to the battery charger.
Action Taken When the DTC Sets
| • | DTC P0D20 and P0D22 are type A DTCs. |
| • | DTC P1EFA and P1EFB are type C DTCs. |
| • | Disables the vehicle high-voltage battery charging. |
Conditions for Clearing the DTC
| • | DTC P0D20 and P0D22 are type A DTCs. |
| • | DTC P1EFA and P1EFB are type C DTCs. |
Reference Information
Schematic Reference
Plug-In Charging Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
Plug-In Charging System Description and Operation
Electrical Information Reference
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References for scan tool information
Special Tools
EL-48900 HEV Safety Kit
For equivalent regional tools, refer to Special Tools .
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 conditions under which high voltage is always present and personal protection equipment (PPE) and proper procedures must be followed. |
| • | Safety goggles with appropriate side shields when within 15 metres (50 feet) of the vehicle, either indoors or outdoors. |
| • | Certified and up-to-date Class "0" Insulation gloves rated at 1000 V 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 energised or not. |
- Verify no other battery-related DTCs are set.
- Vehicle OFF, disable the high voltage at the A4 hybrid/EV battery pack and the T18 battery charger. Refer to High Voltage Disabling .
- Disconnect the X4 connector at the T18 battery charger and at the X5 connector at the A4 hybrid/EV battery pack.
- Test for infinite resistance between the 300 V circuit terminals listed below and earth:
| ⇒ | If less than the specified range, test the 300 V circuit for a short-circuit to earth. |
- Test for less than 10 Ω between the 300 V circuit terminals listed below:
| • | T18 battery charger terminal A X4 and A4 hybrid/EV battery pack A X5 |
| • | T18 battery charger terminal B X4 and A4 hybrid/EV battery pack B X5 |
| ⇒ | If greater than the specified range, test the 300 V circuit for an open-cicuit/high resistance. |
- Test for infinite resistance between the 300 V circuit terminal A X4 and B X4.
| ⇒ | If less than the specified range, test the 300 V circuits for a short-circuit between the circuits. |
- If all circuits test normal, replace the T18 battery charger.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for T18 battery charger replacement, programming and set-up
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