11-34
MAT SENSOR FAULT – FAULT CODE 54
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: MAT sender input greater than 300K ohms
Possible Causes: P1–17, wire connections, MAT sender
Diagnosis & Solution:
1. Verify that Last Fault is FC 54: 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 sender 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 across harness between P1–25 – MAT(A) and P1–20 – MAT(B): repair or replace
harness as necessary.
7. Measure resistance of MAT: Replace sender as necessary.
8. Dealers contact Distributor for technical support, Distributors contact factory for technical support.
MAP SENSOR FAULT – FAULT CODE 56
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: MAP sensor input less than 50kPa at start
Possible Causes: P1–17, ambient pressure/altitude, wire connections, MAP sender, wide open throttle
(WOT) during start
Diagnosis & Solution:
1. Verify that Last Fault is FC 56: 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. Verify ambient pressure greater than 50kPa: change altitude.
4. Inspect connector at sender for looseness and damage: repair or replace connector as necessary.
5. 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.
6. Reconnect P1 connector and test run genset for fault occurrence: repair or replace pins in connector as
necessary.
7. Measure for continuity across harness between P1–31 – MAP(A), P1–22 – MAP(B) and P1–30 –
MAP(C): repair or replace harness as necessary.
8. Measure resistance on sender between MAP(A), MAP(B) and MAP(C): replace sender as necessary.
9. Measure fuel pump pressure/flow: replace fuel filter, pressure regulator or fuel pump as necessary.
10. Dealers contact Distributor for technical support, Distributors contact factory for technical support.
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