11-5
GENSET CRANKS BUT DOES NOT START – NO FAULT CODE
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: Fault codes are based on time lapse between events
Possible Cause: Not holding start switch long enough to cause fault
Diagnosis and Repair:
1. Check and record last fault code.
2. Crank genset and hold switch until control stops cranking and displays fault code (approximately 30 sec-
onds): troubleshoot fault code and reference last fault code recorded above if necessary.
GENSET RUNS BUT STOPS WHEN SWITCH IS RELEASED – NO FAULT CODE
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: Fault codes are based on time lapse between events
Possible Cause: Not holding start switch long enough to cause fault
Diagnosis and Repair:
1. Check and record last fault code.
2. Start genset and hold switch until control shuts down and displays fault code (approximately 30 seconds):
troubleshoot fault code and reference last fault code recorded above if necessary.
LOW OIL PRESSURE FAULT – FAULT CODE 2
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: Continuous ground at control for oil pressure input
Possible Cause: Low/high oil level, faulty switch, faulty oil pressure relief valve, fault oil pump
Diagnosis and Repair:
1. Verify that Last Fault is FC 2: Yes, continue diagnosis; No, troubleshoot actual last fault.
2. Measure oil level: add or drain oil as necessary.
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. Measure continuity change across start/stop switch between rest and under simulated pressure: replace
switch as necessary.
6. HGJAB, C – Measure continuity between ground and P1–13: repair or replace harness as necessary.
HGJAA, D, E, F – Measure continuity between ground and P1–6: repair or replace harness as necessary.
7. Measure oil pressure with mechanical gauge: repair or replace relief valve and oil pump as necessary.
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