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P1F18 BUICK

P1F18 BUICK - Hybrid/EV Battery Pack Coolant Pump Enable Circuit

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3   
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Possible causes

  • Faulty Hybrid/EV Battery Pack Coolant Pump
  • Hybrid/EV Battery Pack Coolant Pump harness is open or shorted
  • Hybrid/EV Battery Pack Coolant Pump circuit poor electrical connection
  • Possible symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)
  • P1f18 Buick Description

    The hybrid/EV battery pack coolant pump circulates coolant through the drive motor battery coolant radiator, drive motor battery coolant cooler and the hybrid/EV battery pack to control the temperature of the hybrid/EV battery pack. An enable signal from the hybrid/EV powertrain control module 2 to the hybrid/EV battery pack coolant pump provides overall control of the pump. When this circuit is high, the pump can operate. The pump is controlled with a pulse-width modulated signal from the hybrid/EV powertrain control module 2 to the hybrid/EV battery pack coolant pump. The higher the duty cycle the higher the pump speed. The hybrid/EV battery pack coolant pump provides a hard-wired pulse-width modulated feedback signal to the hybrid/EV powertrain control module 2. During normal operation, this feedback signal provides pump speed information to the hybrid/EV powertrain control module 2. The hybrid/EV battery pack coolant pump has some self-diagnostic capability. If the hybrid/EV battery pack coolant pump determines there is an internal fault it provides this information on this same feedback circuit instead of pump speed information.
    OBDII Code P1f18 Buick - Hybrid/EV Battery Pack Coolant Pump Enable Circuit - Autoodes.com

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    Repair Importance Level: 3
     
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    Repair Difficulty Level: 3
     
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