Volt

DTC P0D17 or P0D18

The energy management hig-voltage interlock circuit is utilised to verify high-voltage component integrity. The energy management high-voltage interlock circuit is used to determine if access to high-voltage components is being attempted. The opening of these high-voltage components causes high- voltage interlock circuit to open. The hybrid powertrain control module 2 sources about 12 mA of current on the 5 V energy management high-voltage interlock circuit loop. The hybrid powertrain control module 2 monitors both the energy management high-voltage interlock 5 V reference circuit current and the energy management high-voltage interlock signal circuit current in order to detect circuit faults. When the hybrid powertrain control module 2 detects a loss of energy management high-voltage interlock circuit current, the high voltage contactors are commanded open.

P0D17

P0D18

P0D17

The hybrid powertrain control module 2 detects energy management high-voltage interlock circuit 5 V reference voltage is less than 1.5 V.

P0D18

The hybrid powertrain control module 2 detects energy management high-voltage interlock circuit 5 V reference voltage is greater than 1.2 V before applying 5 V or the signal voltage is greater than 2.2 V after applying 5 V.

DTCs P0D17 and P0D18 are Type A DTCs.

Schematic Reference

Hybrid Energy Storage Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Drive Motor Battery System Description

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 .

Ignition ON, observe the hybrid powertrain control module 2 Battery Charging System High-Voltage Interlock Circuit Status parameter.

Danger: High voltage enabling and disabling shall be only performed by High Voltage Qualified Technicians. The procedures for high-voltage enabling/disabling can be found in the service instructions and must be strictly followed at all times. The usage of the Protocol High Voltage Disabling/Enabling is mandatory. The High-Voltage Qualified Technician is responsible for the adherence to the manufacturer's service instructions as well as current national legal regulations.

Danger: Any hybrid/EV battery pack replacement shall be performed by High-Voltage Qualified Technicians only. The replacement procedure can be found in the service instruction and must be strictly followed at all times. The High-Voltage Qualified Technician is responsible for adherence to the manufacturer's service instructions as well as current national legal regulations. If the hybrid/EV battery pack needs to be replaced contact the Technical Assistance Centre for further instructions prior to removal of the battery pack.

Note: The charger high-voltage interlock circuit is routed through several in-line connectors.

1. Ignition OFF, disable high voltage at the A4 hybrid/EV battery pack. Refer to High Voltage Disabling .
2. Connect the 12 V battery.
3. Ignition ON, test for 4.8-5.2 V between the 5 V reference circuit terminal C at the S15 hybrid battery pack high- voltage manual disconnect housing and earth.

⇒	If less than the specified range, test the 5 V reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K114B hybrid powertrain control module 2.

⇒	If greater than the specified range, test the 5 V reference circuit for a short to voltage. If the circuit tests normal, replace the K114B hybrid powertrain control module 2.

4. Ignition OFF and all vehicle systems OFF. It may take up to 2 minutes for all vehicle systems to power down. Test for 8-10k Ω between the signal circuit terminal D and earth.

⇒	If less than the specified range, test the signal circuit for a short to ground. If the circuit tests normal, replace the K114B hybrid powertrain control module 2.

⇒	If greater than the specified range, test the signal circuit for an open/high resistance. If the circuit tests normal, replace the K114B hybrid powertrain control module 2.

5. If all circuits test normal, test or replace the S15 hybrid battery pack high-voltage manual disconnect.

Test for 35-45 Ω between the following terminals of the S15 hybrid battery pack high-voltage manual disconnect:

Perform the Diagnostic Repair Verification after completing the repair.

Control Module References for hybrid powertrain control module 2 and battery charger replacement, programming and set-up