Explanation
The secondary encoder in the throttle demand sensor does not appear to be working properly; the PCM received a signal that
is above the valid limit.
Possible Causes
• Wiring problem
• Defective sensor
Summary of Fault Correction Possibilities
• Check the wiring.
• Replace the sensor.
DemandSensor2_RangeLow
Fault Type:
Horn: Guardian: UFC: Transmission to Helm: Freeze Frame Priority:
Sticky Caution 100% 1062‑25 Yes 2
Explanation
The secondary encoder in the throttle demand 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
• Check the wiring.
• Replace the sensor.
DemandSensor_Diff
Fault Type:
Horn: Guardian: UFC: Transmission to Helm: Freeze Frame Priority:
Sticky Critical 5% 1073‑6 Yes 4
Explanation
The throttle demand sensor does not appear to be working properly. The difference between the primary and secondary
encoder signals exceeded the valid limit.
Possible Causes
• Wiring problem
• Defective sensor
Summary of Fault Correction Possibilities
• Check the wiring.
• Replace the sensor.
Demand_XCheck_Diff
Fault Type:
Horn: Guardian: UFC: Transmission to Helm: Freeze Frame Priority:
Sticky Critical 5% 4001‑6 Yes 4
Explanation
This fault indicates that a command module is not equal to the PCM in the cross‑check of demand value.
Possible Causes
• Incorrect positions used when configuring levers
Fault Codes
90-8M0146617 eng JULY 2018 © 2018 Mercury Marine Page 4A-11
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