11-16
OIL PRESSURE SWITCH FAULT – FAULT CODE 23
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: Only Active Prior to 2001 – Continuous open on oil pressure switch input before cranking
Possible Causes: Wire connections, faulty switch
Diagnosis & Repair:
1. Verify that Last Fault is FC 23: Yes, continue diagnosis; No, troubleshoot actual last fault.
2. Verify harness lead is connected to switch: repair or replace terminal as necessary.
3. Disconnect genset control P1 connector, verify P1 pins are fully inserted and inspect pin condition per:
insert, repair or replace pins as necessary.
4. Reconnect P1 connector and test run genset for fault occurrence.
5. Measure continuity to ground at switch and through harness at P1 connector: replace switch, repair or
replace harness as necessary.
VOLTAGE SENSE LOST – FAULT CODE 27
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: No Sense Voltage (0 VAC across S1–S2) for 1 continuous second after start disconnect
Possible Causes: Genset loads, Inverter/Charger, VAC sense transformer, engine governor function, fuel
supply, choke, demand regulator, carburetor, generator windings, ignition, wire connections, temperature
Diagnosis & Repair:
1. Verify that Last Fault is FC 27: Yes, continue diagnosis; No, troubleshoot actual last fault.
2. Measure AC voltage.
3. Determine battery charge rate (typical default is 80 percent): if adjustable reduce to 30 percent.
4. 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.
5. Reconnect P1 connector and test run genset for fault occurrence: repair or replace pins in connector as
necessary.
6. Check air filter cleanliness; replace air filter as necessary.
7. Check for blocked or damaged exhaust system: repair or replace exhaust components as necessary.
8. HGJAD only – Run genset in Engine Run Only and externally excite field with 12 VDC or 24 VDC and
measure main and quadrature winding AC output.
9. Non EFI only – 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.
To Next Page
Loading...
Need help?
General
