Honda Fault Codes

This Honda manual provides the information required for normal servicing.

HONDA Motorcycle Fault Codes DTC list

Code (MIL)	Cause (a, b, c, ...)	Symptoms
Steady on	There is a jumper in the service connector; not faulty controlnunit (ECM); short circuit in the service connector	Engine 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 light	An open in the MIL circuit of the indicator	Not 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
2	Vacuum 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
21	O2 sensor defective (California only)	Engine is operating normally
23	Faulty O2 heating sensor (California only)	Engine is operating normally
33	Damaged E2-PROM in ECM Engine running normally	Self-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 blinks		Causes	Symptoms
0	No blinks	Faulty ECM	Engine does not start
0	No blinks	Faulty ECM (PGM-FI warning indicator output)	Engine operates normally
0	Stay lit	Short circuit in service check connector Faulty ECM (PGM-FI warning indicator output)	Engine operates normally
1	Blink	Open or short circuit in MAP sensor line (in the ECM) Faulty MAP sensor	Poor idle
7	Blinks	Loose 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
8	Blinks	Open 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)
9	Blinks	Open or short circuit in IAT sensor line (in the ECM)	Engine operates normally (Simulate using numerical values; 25 C/77 F)
12	Blinks	Loose or poor contact on injector connector Open or short circuit in injector wire Faulty injector	Engine does not start
21	Blinks	Loose or poor contact on O2 sensor Open or short circuit in O2 sensor wire Faulty O2 sensor	Engine operates normally
54	Blinks	Loose 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 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.

Honda Models With Service Repair Manuals:

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.

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