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P0480 - Fan 1 Control Circuit

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P0480 - FAN 1 CONTROL CIRCUIT

For Relay Controlled Electric Cooling Fan 
Description:  Monitors the low fan control (LFC) primary circuit output from the powertrain control (PCM). The test fails when the PCM grounds the LFC circuit and excessive current draw is detected on the LFC circuit; or with the LFC circuit not grounded by the PCM the voltage is not detected on the LFC circuit (the PCM expects to detect VPWR voltage coming through the low speed fan control relay coil to the LFC circuit).
Possible Causes: 
  • Open or short LFC circuit
  • Open VPWR circuit to the low speed FC relay
  • Damaged low speed FC relay
Diagnostic Aids:  When the LFC PID reads YES, a concern is currently present. During the key on engine off (KOEO) self-test, the cooling fan is cycled on and off. A short to voltage can only be detected when the PCM is grounding the LFC circuit. During the KOEO and key on engine running (KOER) self-test, the LFC circuit is cycled on and off.
For Variable Speed Electric Cooling Fan 
Description:  This test checks the fan control-variable (FCV) output circuit. The DTC sets if the powertrain control module (PCM) detects the voltage on the FCV circuit is not within the expected range.
Possible Causes: 
  • FCV circuit open or short
  • B+ or ground circuit concern to cooling fan
  • VPWR open to cooling fan (if applicable)
  • Damaged cooling fan module
Diagnostic Aids:  During the key on engine off (KOEO) self-test, the cooling fan is cycled on and off.
For Cooling Fan Clutch 
Description:  This test checks the fan control-variable (FCV) output circuit for the cooling fan clutch. The DTC sets if the powertrain control module (PCM) detects the voltage on the FCV circuit is not within the expected range.
Possible Causes: 
  • FCV circuit open in the harness
  • FCV circuit short to voltage or ground in the harness
  • Damaged cooling fan clutch solenoid.
Diagnostic Aids:  During the key on engine off (KOEO) self-test, the cooling fan is cycled on and off.
Application  Key On Engine Off  Key On Engine Running  Continuous Memory 
Relay Controlled Electric Cooling Fan   refer to PINPOINT TEST KF .
Variable Speed Electric Cooling Fan   refer to PINPOINT TEST KN .
Cooling Fan Clutch   refer to PINPOINT TEST HV .
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