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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