Yamaha MX825 - Fuel Injection System Troubleshooting

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ELECTRICAL
FUEL INJECTION SYSTEM
FUEL INJECTION SYSTEM TROUBLESHOOTING
Error Code No. P0107, P0108
Error Code P0107
System or Component Manifold Absolute Pressure Sensor (MAP)
Detail of Error MAP Circuit Low Voltage or Open
Engine Symptoms
• Poor engine start
• Poor driveability
• Deteriorated exhaust
Engine Running availability Able to run engine
DIAG Tool Code Mode “DIAG”, Code “MAP”
Diagnosing
• Compare the sensor output value with atmospheric absolute pres-
sure (Example: 14.7 psi) with engine stopped.
• Confirm the sensor output value on display changes while engine
cranking.
(Manifold Absolute pressure changes during cranking.)
Probable Cause
• Malfunction in wire harness and coupler between sensor and ECU
• Open or low voltage in wire harness between sensor and ECU
• Malfunction in sensor unit
• Malfunction in ECU
• Vacuum leak from intake manifold
Error Code P0108
System or Component Manifold Absolute Pressure Sensor (MAP)
Detail of Error MAP Circuit High Voltage
Engine Symptoms
• Poor engine start (There is possibility it can’t start)
• Poor driveability
• Deteriorated exhaust
Engine Running availability Able to run engine
DIAG Tool Code Mode “DIAG”, Code “MAP”
Diagnosing
• Compare the sensor output value with atmospheric absolute pres-
sure (Example: 14.7 psi) with engine stopped.
• Confirm the sensor output value on display changes while engine
cranking.
(Manifold Absolute pressure changes during cranking.)
Probable Cause
• Malfunction in wire harness and coupler between sensor and ECU
• High Voltage in wire harness between sensor and ECU
• Malfunction in sensor unit
• Malfunction in ECU
• Vacuum leak from intake manifold