Yamaha MX775 - Page 126

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ELECTRICAL
FUEL INJECTION SYSTEM
Error Code No. P0122, P0123
Error Code P0122
System or Component Throttle Position Sensor (TPS)
Detail of Error TPS Circuit Low Voltage or Open
Engine Symptoms
• Poor engine start (There is possibility it can’t start)
• Poor driveability
• Deteriorated exhaust
• Unstable engine idling (Different idling engine rpm)
• Limited engine performance
Engine Running availability Able to run engine
DIAG Tool Code Mode “DIAG”, Code “TPS”
Diagnosing
• Confirm throttle position on FI diagnostic tool display when throttle
valve is fully opened.
MX825V: 95–100 %
MX800V: 67–77 %
MX775V: 54–64 %
• Confirm throttle position on FI diagnostic tool display when throttle
valve is fully closed.
MX825/800/775V: 0–5 %
• Confirm throttle position on display changes smoothly with throttle
valve open and close.
Probable Cause
• Malfunction in wire harness and coupler between sensor and ECU
• Low voltage or open in wire harness between sensor and ECU
• Malfunction in sensor unit
• Malfunction in ECU
Error Code P0123
System or Component Throttle Position Sensor (TPS)
Detail of Error TPS Circuit High Voltage
Engine Symptoms
• Poor engine start (There is possibility it can’t start)
• Poor driveability
• Deteriorated exhaust
• Unstable engine idling (Different idling engine rpm)
• Limited engine performance
Engine Running availability Able to run engine
DIAG Tool Code Mode “DIAG”, Code “TPS”
Diagnosing
• Confirm throttle position on FI diagnostic tool display when throttle
valve is fully opened.
MX825V: 95–100 %
MX800V: 67–77 %
MX775V: 54–64 %
• Confirm throttle position on FI diagnostic tool display when throttle
valve is fully closed.
MX825/800/775V: 0–5 %
• Confirm throttle position on display changes smoothly with throttle
valve open and close.
Probable Cause
• Malfunction in wire harness and coupler between sensor and ECU
• Low voltage or open in wire harness between sensor and ECU
• Malfunction in sensor unit
• Malfunction in ECU