Honda CB 300 Fault Codes

Honda CB 300 motorcycles have engines, which are made up of many different parts. These parts must work together in order for the engine to function. A problem with one of the parts can make the engine not run. There are many different parts that make up an engine. The following honda cb 300 faults are the list of some of the parts of a motorcycle engine.

The oil level of Honda CB 300 should be the same level in the dipstick, even when the engine is cold. You can check the oil level by removing the dipstick, holding the dipstick in your hand, and then reinserting the dipstick. Then, you’ll be able to see where the oil level is.

Honda CB 300 Faults :

The warning light comes on when one of the various sensors has detected an abnormal condition in the Honda CB 300 engine's performance. For example, if the oil pressure drops below a certain threshold or if the air/fuel ratio rises beyond a certain point, then this would cause an immediate alert from your vehicle's engine management system.

HONDA Motorcycle Fault Codes DTC list

Code (MIL)Cause (a, b, c, ...)Symptoms
Steady onThere is a jumper in the service connector; not faulty controlnunit (ECM); short circuit in the service connectorEngine is operating normally
No light a) ECM power failure
b) Tilt sensor defective
c) Open in the tilt sensor circuit
d) Malfunctioning engine stop relay
e) Open in the engine stop relay circuit
f) Engine breaker not working properly
g) Open in engine stop switch circuit
h) The ignition switch is not working
i) Not good ECM
j) Blown fuse PGM-FI (20A)
k) Open circuit in engine stop circuit
l) Starter / ignition fuse blown (10A)
Engine fails to start
No lightAn open in the MIL circuit of the indicatorNot OK ECM Engine running fine
1 a) MAP sensor contact is off or not
b) Open in MAP sensor circuit
c) Malfunctioning MAP sensor
Engine is operating normally
2Vacuum hose MAP sensor is removed or disconnected Malfunctioning MAP sensor Engine is operating normally
7 a) Whether the contact of the FCT sensor moves away
b) Open or short in ECT sensor circuit
c) Faulty ECT sensor
Heavy engine start at low temperature
8 a) TP contact of the sensor moves away or not
b) Open or short in TP sensor circuit
c) Faulty TP sensor
Poor engine feedback on throttle opening
9 a) Whether the contact of the IAT sensor moves away or not
b) Open or short in IAT sensor circuit
c) c) AT sensor defective
Engine running normally
11 a) The contact of the speedometer sensor
b) An open or short in the speedometer sensor circuit
c) Speedometer sensor defective
Engine running normally
12 a) The contact of the injector No. 1 connector is removed or not
b) Open or short in injector No. 1 connector circuit
c) Injector No 1 defective
Engine does not start
13 a) The contact of the injector No. 2 connector is removed or not
b) Open or short in injector No. 2 connector circuit
c) c) Injector No. 2 is not working
The engine does not start
14 a) The contact of the injector No. 3 connector is removed or not
b) Open or short in injector No. 3 connector circuit
c) Injector No. 3 is not working
The engine does not start
15 a) The contact of the injector No. 4 connector is removed or not
b) Open or short in the injector No. 4 connector circuit
c) Injector No. 4 is not working
The engine does not start
18 a) Whether or not the contact of the pulse generator sensor connector moves away
b) Open or short in the pulse generator sensor connector circuit
c) Pulse generator sensor defective
Engine does not start
19 a) Whether or not the contact of the pulse ignition sensor departs
b) Open or short in the pulse ignition sensor circuit
c) c) Pulse ignition sensor defective
Engine does not start
21O2 sensor defective (California only)Engine is operating normally
23Faulty O2 heating sensor (California only)Engine is operating normally
33Damaged E2-PROM in ECM Engine running normallySelf-diagnosis not saved

Honda MIL Failure Codes

The PGM-FI MIL denotes the failure codes (the number of blinks from 0 to 54). When the indicator lights for 1.3 seconds, it is equivalent to ten blinks. For example; a 1.3 second illumination and two blinks (0.5 second x 2) of the indicator equals 12 blinks. Follow code 12 troubleshooting.

When more than one failure occurs, the MIL shows the blinks in the order of lowest number to highest number. For example; if the indicator blinks once, then seven times, two failures have occurred. Follow codes 1 and 7 troubleshooting.

Number of blinksCausesSymptoms
0No blinksFaulty ECMEngine does not start
0No blinksFaulty ECM (PGM-FI warning indicator output)Engine operates normally
0Stay litShort circuit in service check connector Faulty ECM (PGM-FI warning indicator output)Engine operates normally
1BlinkOpen or short circuit in MAP sensor line (in the ECM) Faulty MAP sensorPoor idle
7BlinksLoose or poor contact on ECT sensor
Open or short circuit in ECT sensor wire Faulty ECT sensor
Hard starting at a low temperature
(Simulate using numerical values; 90 C/194 F)
Cooling fan does not stop
8BlinksOpen or short circuit in TP sensor line (in the ECM)
Faulty TP sensor
Poor engine response when operating the throttle quickly (Simulate using numerical values; throttle open 0)
9BlinksOpen or short circuit in IAT sensor line (in the ECM)Engine operates normally
(Simulate using numerical values; 25 C/77 F)
12BlinksLoose or poor contact on injector connector
Open or short circuit in injector wire Faulty injector
Engine does not start
21BlinksLoose or poor contact on O2 sensor
Open or short circuit in O2 sensor wire
Faulty O2 sensor
Engine operates normally
54BlinksLoose or poor contact on bank angle sensor connector
Open circuit in bank angle sensor wire
Faulty bank angle sensor
Engine starts but stops after few seconds.

Honda CB 300 Motorcycle Problems :

  • Honda cb 300 after fire
  • Honda cb 300 air cleaner clogged, poorly sealed, or missing
  • Honda cb 300 air cleaner element clogged
  • Honda cb 300 air duct loose
  • Honda cb 300 air suction valve trouble
  • Honda cb 300 air switching valve trouble
  • Honda cb 300 backfiring when deceleration
  • Honda cb 300 cracked or obstructed intake air pressure sensor
  • Honda cb 300 crankshaft sensor trouble
  • Honda cb 300 eCU ground and power supply trouble
  • Honda cb 300 eCU trouble
  • Honda cb 300 engine overheating - Water temperature sensor or crankshaft sensor trouble
  • Honda cb 300 engine stalls easily
  • Honda cb 300 engine vacuum not synchronizing
  • Honda cb 300 exhaust Smokes Excessively
  • Honda cb 300 firing incorrect
  • Honda cb 300 fuel filter clogged
  • Honda cb 300 fuel injector clogged
  • Honda cb 300 fuel injector O-ring damage
  • Honda cb 300 fuel injector trouble
  • Honda cb 300 fuel line clogged
  • Honda cb 300 fuel poor quality or incorrect
  • Honda cb 300 fuel pressure regulator trouble
  • Honda cb 300 fuel pressure too low or too high
  • Honda cb 300 fuel pump bearings may wear. Replace the fuel pump
  • Honda cb 300 fuel pump not operating
  • Honda cb 300 fuel pump operates intermittently and often DFI fuse blows
  • Honda cb 300 fuel pump relay trouble
  • Honda cb 300 fuel pump trouble
  • Honda cb 300 fuel/air mixture incorrect
  • Honda cb 300 fuel/air mixture incorrect
  • Honda cb 300 gear position sensor, starter lockout or side stand switch trouble
  • Honda cb 300 inspect and repair or replace
  • Honda cb 300 intake air pressure sensor trouble
  • Honda cb 300 intake air temperature sensor trouble
  • Honda cb 300 intake air temperature sensor trouble
  • Honda cb 300 intermittent any DFI fault and its recovery
  • Honda cb 300 little fuel in tank
  • Honda cb 300 main throttle sensor trouble
  • Honda cb 300 no or little fuel in tank
  • Honda cb 300 poor acceleration
  • Honda cb 300 spark plug burned or gap maladjusted
  • Honda cb 300 spark plug dirty, broken or gap maladjusted
  • Honda cb 300 spark plug incorrect
  • Honda cb 300 spark weak
  • Honda cb 300 stick coil shorted or not in good contact
  • Honda cb 300 stick coil trouble
  • Honda cb 300 subthrottle sensor trouble
  • Honda cb 300 subthrottle valve actuator trouble
  • Honda cb 300 throttle body assy dust seal damage
  • Honda cb 300 throttle body assy holder loose
  • Honda cb 300 throttle valves will not fully open
  • Honda cb 300 unstable (rough) idling
  • Honda cb 300 unstable fuel pressure
  • Honda cb 300 vacuum hose
  • Honda cb 300 vehicle-down sensor trouble
  • Honda cb 300 water or foreign matter in fuel Change fuel
  • Honda cb 300 water temperature sensor trouble

Fault problems that can occur with yourHonda CB 300motorcycle engine is a blown head gasket. This can cause your engine to overheat and possibly crack the cylinder heads. In this case, it is best to take your Honda CB 300 motorcycle to a professional mechanic to have it checked out. Another common problem is with the carburetor. The carburetor is the part of your motorcycle that mixes air and fuel to create the combustion needed to power the engine.

Possible Failure Types :

  • Strange Honda CB 300 engine noise.
  • Honda CB 300 fog from engine.
  • Strange Honda CB 300 engine noise.
  • Honda CB 300 Vibrations and Rattling
  • Honda CB 300 Loud Acceleration
  • Honda CB 300 rusty exhaust
  • Honda CB 300 blockages in exhaust pipe
  • Honda CB 300 wear and tear exhaust
Honda Logo

Honda Motor Company is by far the world's biggest motorcycle maker. Honda's first motorcycle was born out of necessity in immediate post World War II Japan, where public transportation was desperately overcrowded and gasoline severely restricted.Honda's first bikes were very successful and supplies of the surplus engines ran out after a few months. Business was good by then, so he decided to manufacture his own motors. Using the surplus motor as a model, Honda designed and built his own 50cc engine.

Check other Honda fault codes.

Common abbreviations and their meanings below:

ABS: Anti-Lock Braking System
ACR: Automatic Compression Release
AFR: Air Fuel Ratio
AIS: Active Intake Solenoid
ATS: Air Temperature Sensor
BAS: Bank Angle Sensor
BCM: Body Control Module
CAN: Controller Area Network
CCM: Cruise Control Module
CKP: Crank Position Sensor
DLC: Datalink Connector
DTC: Diagnostic Trouble Codes
ECM: Electronic Control Module
ECT: Engine Coolant Temperature
ECU: Electronic Control Unit
EFI: Electronic Fuel Injection
EFP: Electronic Fuel Pump
ET: Engine Temperature sensor
FI: Fuel Injectors
FPR: Fuel Pressure Regulator
H-DSSS: Harley-Davidson® Smart Security System
HCU: Hydraulic Control Unit, ABS
HFSM: Hands Free Security Module
HO2S: Heated Oxygen Sensor
IAC: Idle Air Control actuator
IAT: Intake Air Temperature sensor
ICM: Ignition Control Module
IMAP: MAP + IAT in one unit
ISS: Ion Sensing System
JSS: Jiffy Stand Sensor
LHCM: Left Hand Control Module
MAP: Manifold Absolute Pressure sensor
MHR: Right Hand Control Module
RCM: Reverse Control Module
TCA: Throttle Control Actuator
TGS: Twist Grip Sensor
TMAP: Intake Air Temperature / Manifold Absolute Pressure equipment
TPS: Throttle Position Sensor
TSM / TSSM: (Turn Signal / Turn Signal Security Module)
VE: Volume Efficiency
VIN: Vehicle Identification Number
VSS: Vehicle Speed Sensor
WSS: Wheel Speed Sensor

These abbreviations, and the accompanying list of trouble codes, can be a great start when your Honda check engine light comes on. As mentioned above, if you are not comfortable with electrical diagnostic work, a dealership or qualified technician can offer assistance. Please keep in mind that even though you have the ability to clear a DTC using the onboard diagnostic feature, you shouldn't clear the code prior to your service appointment. Let the technician view and clear the codes as they troubleshoot the issue.

Honda and logo are registered trademarks of Honda. We are fan of MOTORCYCLES ! We love them.

Motorcycle electrical systems are very complex to fix it, check with your motorcycle diagnosis tool for the fault code and start motorcycle troubleshooting process.Some bike problems require professional troubleshooting and repair. However, there are many issues that you can easily fix on your own.

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