Yamaha MX775 Service Manual page 125

FUEL INJECTION SYSTEM
Error Code No. P0117, P0118
Error Code
System or Component
Detail of Error
Engine Symptoms
Engine Running availability
DIAG Tool Code
Diagnosing
Probable Cause
Error Code
System or Component
Detail of Error
Engine Symptoms
Engine Running availability
DIAG Tool Code
Diagnosing
Probable Cause
P0117
Engine Temperature Sensor (ET)
Engine Temperature Sensor Circuit Low Voltage
• Poor engine start
• Poor driveability
• Deteriorated exhaust
• Unstable engine idling
Able to run engine
Mode "DIAG", Code "ET"
• Compare the sensor output value with ambient air temperature.
(with engine cold)
• Confirm the sensor output value on display changes with heating or
cooling sensor alone.
• Sensor resistance: 9.0–11.0 k at 25 C (77 F)
• Malfunction in wire harness and coupler between sensor and ECU
• Low voltage in wire harness between sensor and ECU
• Malfunction in sensor unit
• Malfunction in ECU
P0118
Engine Temperature Sensor (ET)
Engine Temperature Sensor Circuit High Voltage or Open
• Poor engine start
• Poor driveability
• Deteriorated exhaust
• Unstable engine idling
Able to run engine
Mode "DIAG", Code "ET"
• Compare the sensor output value with ambient air temperature.
(with engine cold)
• Confirm the sensor output value on display changes with heating or
cooling sensor alone.
• Sensor resistance: 9.0–11.0 k at 25 C (77 F)
• Malfunction in wire harness and coupler between sensor and ECU
• High voltage or open in wire harness between sensor and ECU
• Malfunction in sensor unit
• Malfunction in ECU
5-14
1
2
3
4
5
6
7
8
9
10