11-29
E. Run genset on shop fuel supply; verify tank level and fuel line condition in vehicle.
F. Check genset fuel lines for damage: replace fuel line as required.
G. Measure regulator lock off pressure.
12. Check governor, actuator, linkage and spring for debris, damage and looseness: readjust and repair as
necessary.
13. HGJAD only – Run genset in Engine Run Only and externally excite field F1–F2 with 12 VDC or 24 VDC
and measure main and quadrature winding AC output
14. Non EFI – If the genset will not stay running measure genset frequency, quadrature winding and main
winding voltages using Break-Out Tool 420–0603 and Instruction Sheet R1098.
15. Remove connector P1 from control and re-install and try to start genset: inspect, repair or replace P1 con-
nector pins as necessary.
16. Measure field, quadrature and main winding resistance: clean slip rings, replace brushes, repair harness
and replace rotor or stator as necessary.
17. Measure field, quadrature and main winding resistance to ground: clean slip rings, replace brushes, re-
pair harness and replace rotor or stator as necessary.
18. Measure field, quadrature and main winding resistance to each other: clean slip rings, replace brushes,
repair harness and replace rotor or stator as necessary.
19. Check brush alignment per PSB-682a.
20. Measure temperature of air intake and temperature rise across genset; remove blockage or prevent air
recirculation.
21. Dealers contact Distributor for technical support, Distributors contact factory for technical support.
PROCESSOR FAULT – FAULT CODE 42
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: ROM (programming variables) error during self test
Possible Causes: Faulty program
Diagnosis & Solution:
1. Verify that Last Fault is FC 42: Yes, continue diagnosis; No, troubleshoot actual last fault.
2. Replace control.
PROCESSOR FAULT – FAULT CODE 43
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: RAM (programming variables) error during self test
Possible Causes: Faulty program
Diagnosis & Solution:
1. Verify that Last Fault is FC 43: Yes, continue diagnosis; No, troubleshoot actual last fault.
2. Replace control.
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