Diagnostic Instructions
| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
| • | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
| • | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
DTC Descriptors
DTC P0ABC: Hybrid Battery Voltage Sensor Circuit Low VoltageDTC P0ABD: Hybrid Battery Voltage Sensor Circuit High Voltage
Circuit/System Description
The generator battery disconnect control module monitors the hybrid battery pack voltage sensor for circuit faults.
Conditions for Running the DTC
The engine is running.
Conditions for Setting the DTC
P0ABC
Pack Voltage raw A/D less than 0.5 volt
P0ABD
Pack Voltage raw A/D greater than 4.5 volts
Action Taken When the DTC Sets
The hybrid system is disabled.
Conditions for Clearing the DTC
The hybrid battery pack voltage operates inside the calibrated threshold range.
Reference Information
Schematic Reference
Hybrid Energy Storage Schematics
Connector End View Reference
Hybrid Energy Storage Connector End Views
Electrical Information Reference
| • | Circuit Testing |
| • | Wiring Repairs |
Scan Tool Reference
Special Tools
J 35616 GM Approved Terminal Test Kit
Circuit/System Testing
Caution: To help avoid personal injury, additional precautions must be taken prior to working on the generator control module or the generator starter. After removing the 36V battery cables from the generator battery, remove both engine wiring harness connectors from the generator control module. Wait at least 5 minutes and then remove the generator control module cover. Verify voltage levels at all 36V, 12V, and 3-phase connections, are less than 3 volts using a DMM before proceeding.
Caution: To help avoid personal injury, be careful when working in the vicinity of the generator battery disconnect control module. Internal components will still be live, 36V potential, even when the cover has been opened or removed.
Important: In order to avoid damaging the generator battery disconnect control module C1 and C2 connector terminals, the proper test probes should be used. The proper test probes are as follows:
| • | J-35616-65B for female terminals |
| • | J-35616-64B for male terminals |
P0ABC
- Verify DTC P0ABC is set as current.
- Disconnect harness connector C1 from the generator battery disconnect control module. Refer to Hybrid Battery Service Disconnect/Connect.
- Test for less than 6.5 volts between C1 terminal 1 and terminal 12.
- Test for 1.3-1.7 kohms between C1 terminal 1 and Generator Battery 1- C1.
- Test for 1.3-1.7 kohms between C1 terminal 12 and Generator Battery 3- C2.
| ⇒ | If greater than the specified range, replace the generator battery disconnect control module. |
| ⇒ | If not within the specified range, replace the harness assembly. |
| ⇒ | If not within the specified range, replace the harness assembly. |
P0ABD
- Verify DTC P0ABD is set as current.
- Disconnect harness connector C1 from the generator battery disconnect control module. Refer to Hybrid Battery Service Disconnect/Connect.
- Test for less than 58.5 volts between C1 terminal 1 and terminal 12.
- Test for 1.3-1.7 kohms between C1 terminal 1 and Generator Battery 1- C1.
- Test for 1.3-1.7 kohms between C1 terminal 12 and Generator Battery 3- C2.
| ⇒ | If less than the specified range, replace the generator battery disconnect control module. |
| ⇒ | If not within the specified range, replace the harness assembly. |
| ⇒ | If not within the specified range, replace the harness assembly. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for generator battery disconnect control module replacement, setup, and programming |
