Mercury V8 250

EGT_RangeLow
Fault Type: Horn: Guardian: UFC: Transmission to Helm: Freeze Frame Priority:
Nonsticky Caution 100% 572‑25 Yes 2
Explanation
The exhaust gas temperature (EGT) sensor does not appear to be working properly; the PCM received a signal that is below
the valid limit.
Possible Causes
• Wiring problem
• Defective sensor
Summary of Fault Correction Possibilities
• Inspect the wiring.
• Check the sensor, replace if required.
ESCLossOfControl
Fault Type:
Horn: Guardian: UFC: Transmission to Helm: Freeze Frame Priority:
Sticky Critical 5% 3032‑6 Yes 4
Explanation
The shift actuator does not appear to be working properly.
Possible Causes
• Wiring problem
• Worn linkage between shift shaft and shift actuator
• Worn gearcase components
• Faulty shift actuator
Summary of Fault Correction Possibilities
• Correct the wiring problem.
• Replace the worn shift linkage components.
• Replace the worn gearcase components.
• Replace the shift actuator.
ESC_DesiredActualDiff
Fault Type:
Horn: Guardian: UFC: Transmission to Helm: Freeze Frame Priority:
Sticky Critical 5% 3031‑6 Yes 4
Explanation
The shift position reading at the helm ERC does not match the shift actuator position of the engine.
Possible Causes
• Wiring problem
• Worn linkage between shift shaft and shift actuator
• Worn gearcase components
• Faulty shift actuator
Summary of Fault Correction Possibilities
• Correct the wiring problem.
• Replace the worn shift linkage components.
Fault Codes
90-8M0146617 eng JULY 2018 © 2018 Mercury Marine Page 4A-15