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 P0ADB: Hybrid Battery Positive Contactor Control Circuit Low VoltageDTC P0ADC: Hybrid Battery Positive Contactor Control Circuit High Voltage
Circuit/System Description
The battery energy control module (BECM) monitors the contactor control circuit for a shorted low or high condition.
Conditions for Running the DTC
Ignition On.
Conditions for Setting the DTC
P0ADB
Contactor control feedback is greater than 98 percent.
P0ADC
Contactor control feedback is less than 5 percent.
Action Taken When the DTC Sets
Hybrid system is disabled.
Conditions for Clearing the DTC
P0ADB, P0ADC
| • | State is Run, Service or Powerdown. |
| • | Contactor state = Closed. |
| • | Contactor status = Open, Service or Disconnect. |
Diagnostic Aids
| • | Possible wiring harness short to ground. |
| • | Possible wiring harness short to voltage or open. |
Reference Information
Schematic Reference
Hybrid Energy Storage Schematics
Connector End View Reference
Description and Operation
Generator Battery Carrier Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
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.
- With a scan tool, clear the DTC.
- Ignition OFF, wait 30 seconds.
- Using the ECM scan tool contactor control special function command the contactor Open and Closed.
| ⇒ | If the contactor does not operate or the DTC resets replace the BECM. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for BECM replacement, setup, and programming.
