11-6
SERVICE CHECK FAULT – FAULT CODE 3
WARNING
Some genset service procedures present hazards that can result in severe personal injury
or death. Only trained and experienced persons with knowledge of fuels, electricity, and machinery
hazards should perform genset service. See Safety Precautions.
Logic: Single-Digit Fault to indicate shutdown due to a Two-Digit Fault
Possible Cause: Any Two-Digit Fault Code
Diagnosis and Repair:
1. Verify that Last Fault is FC 3: Yes, continue diagnosis; No, troubleshoot actual last fault.
2. While LED is flashing three times press stop once (1 second duration): trouble shoot Two-Digit Fault
Code.
OVERCRANK – FAULT CODE 4
WARNING
Some genset service procedures present hazards that can result in severe personal injury
or death. Only trained and experienced persons with knowledge of fuels, electricity, and machinery
hazards should perform genset service. See Safety Precautions.
Logic: Controller unable to sense genset frequency after 30 seconds of holding start switch
Possible Cause: Faulty switch, faulty external start command, fuel supply, air fuel mixture, exhaust system,
wire connections, starter, ignition system
Diagnosis and Repair:
1. Verify that Last Fault is FC 4: Yes, continue diagnosis; No, troubleshoot actual last fault.
2. Measure for continuity change across start/stop switch between neutral and start position at switches and
P1 connector: replace switches as necessary or disconnect external start device if so equipped.
3. Disconnect genset control P1 connector, verify P1 pins are fully inserted and inspect pin condition per
PSB–676: insert, repair or replace pins as necessary.
4. Reconnect P1 connector and test run genset for fault occurrence: repair or replace pins in connector as
necessary.
5. Verify engine rotation manually: repair engine damage as necessary.
6. Measure DC voltage at starter during start attempt: repair wire connections, replace start solenoid and
starter as necessary.
7. Check air filter cleanliness; replace air filter as necessary.
8. Check for blocked or damaged exhaust system: repair or replace exhaust components as necessary.
9. All Gasoline Models
A. Vapor lock may occur in high ambient temperatures: operate in ambients at less than 120°F; verify
proper installation to prevent air recirculation; correct as necessary.
B. Measure steady DC voltage at fuel pump while genset is cranking: repair wiring as necessary.
C. Try to start genset on shop fuel supply: verify tank level and fuel line condition in vehicle.
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