529
Thermo King
Warning

Check Fuel Pump Circuit

Electrical anomaly detected in the fuel pump circuit.

Possible causes

  • Defective fuel pump (open coil or short)
  • Blown fuel pump fuse
  • Damaged or frayed pump wiring
  • Failed fuel pump relay

Recommended actions

  • Measure fuel pump resistance
  • Check pump fuses and relays
  • Inspect wiring from controller to pump
  • Test pump with an external 12V source

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