11-33
FIELD SENSE FAULT – FAULT CODE 48
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 field voltage
Possible Causes: Faulty control
Diagnosis & Solution:
1. Verify that Last Fault is FC 48: Yes, continue diagnosis; No, troubleshoot actual last fault.
2. Replace control.
PROCESSOR FAILURE – FAULT CODE 51
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: Processor error
Possible Causes: Faulty control
Diagnosis & Solution:
1. Verify that Last Fault is FC 51: Yes, continue diagnosis; No, troubleshoot actual last fault.
2. Replace control.
FUEL INJECTOR FAULT – FAULT CODE 52
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: Open or shorted fuel injector
Possible Causes: P1–17, wire connections, fuel injector
Diagnosis & Solution:
1. Verify that Last Fault is FC 52: Yes, continue diagnosis; No, troubleshoot actual last fault.
2. Measure P1–17 open to ground on EFI set: ground lead as required for carburetor configuration.
3. Inspect connector at injectors for looseness and damage, repair or replace connector as necessary.
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. Measure for continuity between P1–23 – INJ1 and P1–35 – INJ2: repair or replace harness as necessary.
7. Measure for continuity to ground from P1–23, P1–35, INJ1 and INJ2: repair or replace harness as neces-
sary.
8. Replace injector.
9. Dealers contact Distributor for technical support, Distributors contact factory for technical support.
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