DTC P1F0A-P1F0D
Diagnostic Instructions
DTC Descriptors
DTC P1F0A: A/C Compressor Motor Speed Performance
DTC P1F0B: A/C Compressor Motor Start-Up Current Performance
DTC P1F0C: Electric A/C Compressor Control Module A/C Compressor Motor Current Feedback Circuit Low Voltage
DTC P10FD: Electric A/C Compressor Control Module A/C Compressor Motor Current Feedback Circuit High Voltage
Circuit/System Description
The AC compressor function is to provide refrigerant flow in the AC refrigerant loop to help cool down the cabin, help dehumidify the air in a defrost mode and help maintain the battery temperature. Rather than a more typical pulley, the A/C compressor uses a 3-phase alternating current, high voltage electric motor to operate. It has an on-board inverter that takes High Voltage direct current from the vehicle's High voltage battery and inverts it to alternating current for the motor. The AC compressor shall be activated when any of the three following events occur:
| • | The customer pushes the AC button |
| • | The HVAC control, in AUTO mode, requests the electric AC compressor on to help in cooling the cabin or removing moisture in the defrost mode |
| • | The High Voltage Battery Thermal System requests the AC compressor on to help maintain the battery temperature |
The Hybrid/EV Powertrain Control Module 2 uses values from the A/C refrigerant pressure transducers, A/C refrigerant thermistor, duct temperature sensors, ambient air temperature sensor, passenger compartment temperature sensor, evaporator temperature sensor, battery cell temperature sensors, battery coolant temperature sensors and battery coolant pumps to determine the speed at which the compressor will operate. This message is sent from the Hybrid/EV Powertrain Control Module 2 to the A/C compressor control module via serial data message.
AC Compressor has a motor start up procedure that can take a variable length of time to run to bring the motor up to requested speed. Length of time is dependent on external conditions such as under-bonnet temperature and high side pressure. In hotter conditions, the motor start up time will be longer. The A/C compressor control module monitors an internal parameter known as the DC link current which is based off DC input current. It is not possible to measure this parameter externally.
Conditions for Running the DTC
DTC P1F0A
| • | 12 V battery system voltage is above 10.25 V. |
| • | Vehicle is in Run Mode or Charging Mode |
| • | Compressor is in start up mode |
DTC P1F0B
| • | 12 V battery system voltage is above 10.25 V. |
| • | Vehicle is in Run Mode or Charging Mode |
| • | Compressor is in start up mode |
DTC P1F0C
| • | 12 V battery system voltage is above 10.25 V. |
| • | Vehicle is in Run Mode or Charging Mode |
| • | Compressor is in start up mode |
DTC P1F0D
| • | 12 V battery system voltage is above 10.25 V. |
| • | Vehicle is in Run Mode or Charging Mode |
| • | Compressor is in start up mode |
Conditions for Setting the DTC
DTC P1F0A
| • | A/C compressor control module temperature is greater than 85°C (185°F) and compressor motor speed does not reach to 1800 RPM within 20 seconds after the start of spinning |
| • | A/C compressor control module temperature is less than or equal to 85°C and A/C compressor motor speed does not reach 1800 RPM. |
DTC P1F0B
Any A/C compressor control module phase current (U/V/W) >= -1A during initial motor startup process
DTC P1F0C
A/C compressor control module DC link Current is less than 2.5 A for 6 seconds
DTC P1F0D
A/C compressor control module DC link Current is greater than 36.7 A for 6 seconds
Action Taken When the DTC Sets
The A/C compressor control module is disabled but will retry once the compressor speed request goes to 0 RPM and a new speed request > 0 RPM is sent.
Conditions for Clearing the DTC
These are type B DTCs
Reference Information
Schematic Reference
HVAC Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
Automatic HVAC Description and Operation
Electrical Information Reference
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
- Verify that DTC P0F0A-P1F0D is not set.
| ⇒ | If the DTC is set, verify that the A/C compressor control module and the Hybrid/EV Powertrain Control Module 2 have the latest software and reprogramme the modules if needed |
- Operate the vehicle within the conditions for running the DTC.
| ⇒ | If the DTC is set, replace the G1 A/C compressor. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| ©© Copyright Chevrolet. All rights reserved |
