• Inspect the fuel quality.
X ..........
XDRPa_RangeHigh
Fault Type: Horn: Guardian: UFC: Transmission to Helm: Freeze Frame Priority:
Nonsticky Critical 100% 601‑4 Yes 3
Explanation
The sensor power supply A (transducer power 1) voltage is high; the value is valid, but is higher than expected.
Possible Causes
• Problem with engine wire harness
Summary of Fault Correction Possibilities
•
Inspect the engine wire harness for shorts or opens in the Sensor Power A circuit. For the circuit diagram, refer to Section
5A ‑ Sensors.
XDRPa_RangeLow
Fault Type:
Horn: Guardian: UFC: Transmission to Helm: Freeze Frame Priority:
Nonsticky Critical 100% 601‑5 Yes 3
Explanation
The sensor power supply A (transducer power 1) voltage is low; the value is valid, but is lower than expected.
Possible Causes
• Problem with engine wire harness
• Shorted sensor
Summary of Fault Correction Possibilities
•
Inspect the Sensor Power A circuitry for opens and shorts. For the circuit diagram, refer to Section 5A ‑ Sensors.
•
Disconnect each sensor powered by sensor power A (refer to Section 5A ‑ Sensors), while observing CDS G3.
• If the fault does not disappear, reconnect the sensor and continue with the next sensor.
• If the fault does disappear, test that sensor for a short, and replace as required.
XDRPb_RangeHigh
Fault Type:
Horn: Guardian: UFC: Transmission to Helm: Freeze Frame Priority:
Nonsticky Critical 100% 602‑4 Yes 3
Explanation
The sensor power supply B (transducer power 2) voltage is high; the value is valid, but is higher than expected.
Possible Causes
• Problem with engine wire harness
Summary of Fault Correction Possibilities
•
Inspect the Sensor Power B circuitry for opens and shorts. For the circuit diagram, refer to Section 5A ‑ Sensors.
XDRPb_RangeLow
Fault Type:
Horn: Guardian: UFC: Transmission to Helm: Freeze Frame Priority:
Nonsticky Critical 100% 602‑5 Yes 3
Fault Codes
90-8M0146617 eng JULY 2018 © 2018 Mercury Marine Page 4A-47
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