Volt

14 Volt Power Module Cooling Fan Malfunction - DTC P1EA6 or P1EA7

The 14 V power module cooling fan blows air through the 14 V power module to control the temperature of the 14 V power module. The fan is controlled with a pulse-width modulated signal sent from the hybrid/EV powertrain control module 2 to the 14 V power module fan. The longer the duty cycle on the signal the higher the fan speed. Maximum fan speed is 3,900 RPM. An enable signal from the hybrid/EV powertrain control module 2 to the 14 V power module fan provides overall control of the fan. When this circuit is high, the fan can operate. The 14 V power module fan provides a hard-wired pulse-width modulated feedback signal to the hybrid/EV powertrain control module 2. During normal operation, this feedback signal provides fan speed information. The 14 V power module fan has some self-diagnostic capability. If it determines there is an internal fault it provides this information on this same feedback circuit instead of speed information.

P1EA6

P1EA7

The 12 V battery voltage is greater than or equal to 9 V.

P1EA6

The hybrid/EV powertrain control module 2 has detected an open, short-circuit to voltage or short-circuit to earth on the 14 V power module cooling fan control circuit

P1EA7

The hybrid/EV powertrain control module 2 has detected an open, short-circuit to voltage or short-circuit to earth on the 14 volt power module cooling fan enable circuit.

DTCs P1EA6 and P1EA7 are type B DTCs.

DTCs P1EA6 and P1EA7 are type B DTCs.

Schematic Reference

Hybrid Cooling Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Hybrid Cooling System 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

Vehicle in Service Mode, with a scan tool, command the 14 V Power Module Fan Command between 10%-90%-10%. Verify that the 14 V Power Module Fan Speed increases and decreases with the command.

Danger: Any hybrid/EV battery pack replacement shall be performed by High-Voltage Qualified Technicians only. The replacement procedure can be found in the service instruction and must be strictly followed at all times. The High-Voltage Qualified Technician is responsible for adherence to the manufacturer's service instructions as well as current national legal regulations. If the hybrid/EV battery pack needs to be replaced contact the Technical Assistance Centre for further instructions prior to removal of the battery pack.

1. Ignition OFF, disconnect the harness connector at the G38 14 V power module cooling fan.
2. Ignition OFF and all vehicle systems OFF. It may take up to 2 minutes for all vehicle systems to power down. Test for less than 10 Ω between the ground circuit terminal 1 and ground.

⇒	If greater than the specified range, test the ground circuit for an open/high resistance.

3. Connect a test lamp between the B+ circuit terminal 5 and earth circuit terminal 1.
4. Vehicle in Service Mode, verify that a test lamp illuminates between the B+ circuit terminal 5 and earth circuit terminal 1.

⇒	If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal and the B+ circuit fuse is open, replace the G38 14 V power cooling module fan.

5. Connect a test lamp between the enable circuit terminal 4 and earth circuit terminal 1.
6. Command the 14 V Power Module Fan Command OFF (10%) and ON (90%) with a scan tool. Verify the test lamp turns OFF and ON when changing between the commanded states.

⇒	If the test lamp is always illuminated at 10%, test the pump enable circuit for a short-circuit to voltage. If the circuit tests normal, replace the K114B hybrid/EV powertrain control module 2.

⇒	If the test lamp does not illuminate at 90%, test the pump enable circuit for a short-circuit to earth or an open-circuit/high resistance. If the circuit tests normal, replace the K114B hybrid/EV powertrain control module 2.

7. Connect a test lamp between the control circuit terminal3 and the B+ circuit terminal 5.
8. Command the 14 V Power Module Fan ON between 10% and 90% with a scan tool. Verify that a test lamp changes illumination between bright (10%) and dim (90%) between the control circuit terminal 3 and the B+ circuit terminal 5.

⇒	If the test lamp is always dim or does not illuminate, test the control circuit for a short-circuit to voltage or an open-circuit/high resistance. If the circuit tests normal, replace the K114B hybrid/EV powertrain control module 2.

⇒	If the test lamp is always bright, test the control circuit for a short-circuit to earth. If the circuit tests normal, replace the K114B hybrid/EV powertrain control module 2.

9. Verify the scan tool 14 V Power Module Fan Feedback parameter is less than 10%.

⇒	If greater than the specified range, test the feedback circuit terminal 2 for a short-circuit to earth. If the circuit tests normal, replace the K114B hybrid/EV powertrain control module 2.

10. Install a 3 A fused jumper wire between the feedback circuit terminal 2 and the B+ circuit terminal 5. Verify that the scan tool, 14 V Power Module Fan Feedback parameter is greater than 90%.

⇒	If less that the specified range, test the feedback circuit for a short-circuit to voltage or an open-circuit/high resistance. If the circuit tests normal, replace the K114B hybrid/EV powertrain control module 2.

11. If all circuits test normal, replace the G38 14 V power module cooling fan.

Perform the Diagnostic Repair Verification after completing the repair.