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450R/X Codes and Symptoms

112K views 42 replies 31 participants last post by  nachoromero9924 
#1 · (Edited by Moderator)
Code 12. - Crankshaft Position Sensor
Symptom - No normal signals are received from the crankshaft position sensor.
Probable Cause
- malfunction in pickup rotor
- malfunction in ECU
- improperly installed sensor
- Unable to start
- unable to drive

Code 13. - Intake or air presser sensor (Open or Short Circuit)
Symptom - open or short circuit detected.
Probable Cause
- open/short circuit in wire harness
- Malfunction in ECU
- Defective air pressure sensor
- Able to start
- Able to drive

Code 14. - Intake air pressure (Pipe System)
Symptom - Pipe system malfunction (clogged or detached hose)
Probable Cause
- Intake air pressure sensor hose is clogged detached kinked or pinched.
- clog in the opening of the intake air pressure sensor.
- Able to start
- Able to drive

Code 15. - Throttle position sensor
Symptom - Open or Short Circuit
Probable Cause
- Open/short circuit in harness
- defective sensor
- malfunction in ECU
- improperly installed sensor
- Able/Unable to start
- Able/Unable to drive

Code 21. -Coolant temp sensor
Symptom - Open or short circuit detected
Probable Cause
- Open/short circuit in wire harness
- defective sensor
- Malfunction in ECU
- Improperly installed sensor
- Able to start
- Able to drive

Code 22.- Intak air temperature sensor
Symptom - Open or short circuit detected
Probable Cause
- Open/short circuit in wire harness
- defective sensor
- Malfunction in ECU
- Improperly installed sensor
- Able to start
- Able to drive

Code 30. - Lean angle sensor (Latch up detected)
Symptom - vehicle has overturned
Probable Cause
- Vehicle overturned
- Defective sensor
- Malfunction in ECU
- Improperly installed sensor
- Unable to start
- Unable to drive

Code 33.- Ignition Coil (Faulty ignition)
Symptom - Malfunction detected in the primary wire of the ignition coil
Probable Cause
- Open/short circuit in wire harness
- Malfunction in coil
- Malfunction in ECU
- Improperly installed ignition coil
- Unable to start
- Unable to drive

Code 37. - ISC valve (stuck fully open)
Symptom -Fast Idle
Probable Cause
- defective speed sensor
- Open/short circuit in wire harness
- malfunction in throttle body
- malfunction in throttle cable
- defective ISC
- ISC stuck fully open
- Hose coming off
- Leak in intake path
- Malfunction in ECU
- Able to start
- Able to drive

Code 39. - Injector (open circuit)
Symptom - Injector: open or short circuit
Probable Cause
- Open/short circuit in wire harness
- defective injector
- malfunction in injector
- malfunction in ECU
- improperly installed injector
- Unable to start
- Unable to drive

Code 41. - Lean Angle Sensor (Open or Short circuit)
Symptom - Lean Angle Sensor: Open or short circuit detected
Probable Cause
- Open/short circuit in wire harness
- defective sensor
- Malfunction in ECU
- Unable to start
- Unable to drive

Code 42. - Speed Sensor
Symptom - No normal signals received from speed sensor
Probable Cause
- Open/short circuit in wire harness
- defective sensor
- Malfunction in ECU
- Able to start
- Able to drive

Code 43. - Fuel System Voltage
Symptom - The ECU is unable to monitor the battery voltage
Probable Cause
- Open/short circuit in wire harness
- malfunction in main relay
- malfunction in ECU
- Able to start
- Able to drive

Code 44. - Error in writing the amount of CO adjustment on EEPROM
Symptom - Error is detected while writing the EEPROM (CO adjustment value)
Probable Cause
- Malfunction in ECU(The CO adjustment value is not properly written on or read from the internal memory).
- Able to start
- able to drive

Code 46. - Vehicle system power (monitoring voltage)
Symptom -Power supply to the injection system is not normal
Probable Cause
- Malfunction in charging system
- Able to start
- Able to drive

Code 50. - ECU internal malfunction (memory check error)
Symptom - Faulty ECU memory (When this malfunction is detected in the ECU, the fault code might not appear on the FI diagnostic tool.)
Probable Cause
- Malfunction in ECU
- Unable to start
- Unable to drive

I hope this helps everyone get a general idea what the codes are telling you if you need anything else I have a manual that goes into deeper detail so please PM me if you need more info.
 
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#14 ·
My engine lights on after I installed my fci the only things I unplugged was the intake sensor and the silaniod by the battery I'm running no airbox I modified my stock one so I could bolt the crank case breather up got it back together it cranks but engine lights on no blinks just stays on I ve ordered a ltr breather box haven't got it yet is why I ve mc givered this could it be that that throwing the code or the intake air sensor also should I silicon around where the sensor goes in the tube it's got me wondering if its air tight thanks in advance for any help
 
#18 ·
Well pretty sure I figured it out took the air intake sensor out an it was bent I barely put any pressure on it and it broke guess it happened putting it in it was a little hard goin in
 
#25 ·
the long blinks indicate the first digit, then the short blink indicate the second. For example 31 would be three long, then one short. It will repeat. If there are two it will repeat both one after another.
 
#24 ·
YFZ450R manuals are located on NKO in library, under DIY, small engine repair. If you don't know what NKO is, its a navy website. Have your sailor friends look it up for you.
 
#30 ·
My check engine light only comes on when the bike is on and in gear. It turns on fine and rides fine (I just rode it normal down my block didn't give it a lot of gas) But the check engine light stays on when it's in gear. It doesn't throw any flashes for a code..

Does anyone know what it means?
 
#32 ·
I had code 12 pop up, everything was working however it wasn’t cranking over but the starter was engaging and only made a buzzing sound. Turns out the flywheel had all the bolts backed out due to not having thread locker on them and hit the stator which threw the code. No one posted it before so I spent a lot of time testing everything, hope this helps
 
#33 ·
I have a 2018 yfz450r and bike ran and idled fine before i started putting parts on it. Only electrical parts I installed was a kill switch and start button. Now the bike is hard to start and it has a blown fuse and engine light keeps flashing 10 times and looks like the timing doesnt change between flashes
 
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