Yamaha MX775 - Page 134

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ELECTRICAL
FUEL INJECTION SYSTEM
Error Code No. P0171, P0172, P0174
Error Code P0171
System or Component BLM MaxAdapt
Detail of Error Correction amount of injection fuel is beyond upper limit
Engine Symptoms
• Poor engine start (There is possibility it can’t start)
• Poor driveability
• Deteriorated exhaust
• Unstable engine idling (Different idling engine rpm)
Engine Running availability Able to run engine
DIAG Tool Code —
Diagnosing —
Probable Cause
• Fuel system malfunction (Clogged fuel filter/line, fuel injector, fuel
pump)
• Malfunction in O
2
sensor
• Malfunction in manifold absolute pressure sensor
• Difference of actual intake air volume (Intake air leak, clogged man-
ifold, dirty/restricted air filter)
• Malfunction in ECU
• Malfunction in wiring harness
Error Code P0172
System or Component BLM MinAdapt
Detail of Error Correction amount of injection fuel is beyond lower limit
Engine Symptoms
• Poor engine start (There is possibility it can’t start)
• Poor driveability
• Deteriorated exhaust
• Unstable engine idling (Different idling engine rpm)
• Overheat
• Engine knock sound
Engine Running availability Able to run engine
DIAG Tool Code —
Diagnosing —
Probable Cause
• Fuel system malfunction (Clogged fuel filter/line, fuel injector, fuel
pump)
• Malfunction in O
2
sensor
• Malfunction in manifold absolute pressure sensor
• Difference of actual intake air volume (Intake air leak, clogged man-
ifold, dirty/restricted air filter)
• Malfunction in ECU
• Malfunction in wiring harness