P0C4D
DTC P0C47, P0C4C, or P0C4D
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview) provides an overview of each diagnostic category.
DTC Descriptors
DTC P0C47
- Hybrid Battery Coolant Pump Control Circuit/Open
DTC P0C4C
- Hybrid Battery Coolant Pump Supply Voltage Circuit Low
DTC P0C4D
- Hybrid Battery Coolant Pump Supply Voltage Circuit High
Diagnostic Fault Information
Circuit/System Description
The drive motor generator battery control module will diagnose its own systems and determine when a fault condition is present. Diagnostics and system status is communicated from the drive motor generator battery control module to the drive motor generator control module through serial data. The drive motor generator control module is the host controller for diagnostic trouble code (DTC) information.
Drive motor generator battery is cooled by the drive motor battery coolant fan / drive motor battery coolant pump and a radiator. The drive motor battery coolant fan / drive motor battery coolant pump are located inside the drive motor generator battery assembly and are serviced as a complete cooler assembly. B+ to the drive motor battery coolant fan / coolant pump is provided by the drive motor generator battery control module from a high side driver. A grounding wire from the generator battery coolant fan motor assembly completes the path to ground. A 5 V circuit is provided from the drive motor battery coolant fan, to the drive motor generator battery control module. The drive motor generator battery control module uses a pulse width modulated (PWM) signal on the 5 V circuit to control the drive motor battery coolant fan duty cycle. The drive motor battery coolant fan also supplies an additional 5 V signal that indicates fan speed feedback to the drive motor generator battery control module, the lower the voltage the greater the fan speed. The drive motor generator battery control module uses 4 battery temperature sensors, one air inlet temperature sensor and a coolant temperature sensor to control the drive motor battery coolant fan and coolant pump operation.
Conditions for Running the DTC
P0C47
* System voltage is 9-18 V.
* The vehicle power mode is ON.
* The coolant pump is ON.
P0C4C and P0C4D
* System voltage is 9-18 V.
* The vehicle power mode is ON.
Conditions for Setting the DTC
P0C47
* The drive motor generator battery control module detects the coolant pump current is greater than 8.5 A
* The drive motor generator battery control module detects the coolant pump current is less than 10 mA.
P0C4C
* The drive motor generator battery control module detects system voltage on the supply voltage circuit is less than 8 V for 5 seconds.
* The drive motor generator battery control module detects the coolant temperature is greater than 58 °C (+136°F)
P0C4D
* The drive motor generator battery control module detects system voltage on the supply voltage circuit is greater than 16 V 5 seconds.
* The drive motor generator battery control module detects the coolant temperature is greater than 58 °C (+136°F)
Action Taken When the DTC Sets
* DTC P0C47 is a type B DTC.
* DTC P0C4C, P0C4D are type C DTCs.
Conditions for Clearing the DTC
* DTC P0C47, is a type B DTC.
* DTCs, P0C4C, P0C4D are type C DTCs.
Diagnostic Aids
An open BPCM fuse will cause DTCs P0C47 and P0C4C to set.
Reference Information
Schematic Reference
Hybrid Cooling Schematics (Electrical Diagrams)
Connector End View Reference
Component Connector End Views (Connector Views)
Description and Operation
Drive Motor Generator Battery Cooling Description (Drive Motor Generator Battery Cooling Description)
Electrical Information Reference
* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions (Diagnostic Trouble Code Descriptions)
Scan Tool Reference
Control Module References (Programming and Relearning) for scan tool information
Special Tools
EL-48900 HEV Safety Kit
Circuit/System Verification
Ignition ON, with a scan tool command the drive motor battery coolant pump ON. The coolant pump should turn ON/OFF when changing between the commanded states.
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 condition under which high voltage is always present and personal protection equipment (PPE) and proper procedures must be followed.
Failure to follow the procedures exactly as written may result in serious injury or death.
1. Ignition OFF, disable the high voltage at the drive motor generator battery. Refer to High Voltage Disabling (High Voltage Disabling).
2. Ignition OFF, disconnect the X1 harness connector at the drive motor generator battery control module.
3. Ignition OFF, connect the 12 V battery
4. Ignition ON, verify that a test lamp illuminates between B+ circuit terminals listed below and ground:
* Terminal 67
* Terminal 68
• If the test lamp does not illuminate, test the B+ circuits for a short to ground or an open/high resistance.
5. Connect the X1 harness connector at the drive motor generator battery control module.
6. Disconnect the X456 inline harness connector at the side of the drive motor generator battery assembly.
7. Ignition OFF, test for less than 5 ohm between the low reference circuit terminal G and ground.
• If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the drive motor generator battery control module.
8. Ignition ON, Test for 9-15 V between low reference circuit terminal G and the B+ circuit terminal M.
• If not within the specified range, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the drive motor generator battery control module.
9. Ignition ON, test for 9-15 V between the low reference circuit terminal G and the fan speed control signal circuit terminal C.
• If not within the specified range, test the fan speed control signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the drive motor generator battery control module.
10. Ignition ON, test for 4.8-5.2 V between the low reference circuit terminal G and the fan feedback signal circuit terminal L.
• If not within the specified range, test the fan feedback signal circuit fro a short to ground or an open/high resistance. If the circuit tests normal, replace the drive motor generator battery control module.
11. If all circuits test normal, replace the drive motor generator battery assembly.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the repair.
* Drive Motor Battery Coolant Cooler Replacement (Drive Motor Battery Coolant Cooler Replacement)
* Drive Motor Battery Sensor Module Wiring Harness Replacement (Drive Motor Battery Sensor Module Wiring Harness Replacement)
* Drive Motor Generator Battery Replacement (Drive Motor Generator Battery Control Module and Bracket Replacement)
* Control Module References (Programming and Relearning) for drive motor generator battery control module replacement, setup and programming