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 Descriptor
DTC P0AA1: Hybrid Battery Positive Contactor Circuit Stuck ClosedCircuit/System Description
The generator battery disconnect control module monitors to detect a fault with the contactor.
The Link Voltage is the voltage on the 36 volt cable between the SGCM and the generator battery disconnect control module, Pack voltage is the sum of all module voltages. refer to Hybrid Energy Storage Schematicsfor detailed information.
Conditions for Running the DTC
Ignition to OFF, transition from contactor closed to contactor open.
Conditions for Setting the DTC
Absolute Value (Pack Voltage - Link Voltage) is less than 1 volt.
Action Taken When the DTC Sets
The hybrid system is disabled.
Conditions for Clearing the DTC
| • | State = Run or Service or Powerdown. |
| • | Pack current is less than -0.1 amps. |
| • | Contactor state = Open. |
| • | Contactor status = Open Service Disconnect. |
| • | Current sensor DTCs = Passed. |
| • | Pack voltage reading = Valid. |
| • | Pack voltage DTCs = Passed. |
Reference Information
Schematic Reference
Hybrid Energy Storage Schematics
Connector End View Reference
Hybrid Energy Storage Connector End Views
Electrical Information Reference
Scan Tool Reference
Circuit/System Verification
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.
- If there are any current DTCs set, diagnose those first, including any clearing any codes.
- Cycle the ignition switch from OFF to RUN several times, allowing at least 5 seconds after each transition from Ignition OFF to RUN.
| ⇒ | If the DTC resets, replace the generator battery disconnect control module. |
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.
