Honda NHX110 User Manual

FUEL SYSTEM (Programmed Fuel Injection)
6-17
SYMPTOM TROUBLESHOOTING
When the scooter has one of these symptoms, check the MIL blinking, refer to the MIL code index (page 6-18) and begin
the appropriate troubleshooting procedure. If there are no MIL blinking stored in the ECM memory, do the diagnostic pro-
cedure for the symptom, in sequence listed below, until you find the cause.
Symptom Diagnosis procedure Also check for
Engine does not crank
(No fuel pump operation
sound when turning the
ignition switch "ON")
1. Inspect the ECM power/ground
circuits (page 6-19).
2. Inspect the sensor unit power
circuit (page 6-21).
• Open or short circuit in the power input
wire of the ECM
• Open circuit in the ground wire of the ECM
• Faulty bank angle sensor or related circuit
• Faulty engine stop relay or related circuit
• Faulty ECM
• Short circuit in the power input wire of the
sensor unit
• Faulty sensor unit
• Faulty ignition switch
Engine cranks but won’t
start
(No MIL blinking)
1. Crank the starter for more than
ten seconds and check the MIL
(page 6-13) and execute the
troubleshooting according to
the MIL.
2. Inspect the CKP sensor.
3. Inspect the fuel supply system
(page 6-32).
4. Inspect the injector.
5. Inspect the IACV (page 6-56).
• No fuel to injector
– Clogged fuel filter
– Pinched or clogged fuel feed hose
– Pinched or clogged fuel tank breather
hose
– Faulty fuel pump
– Faulty fuel pump circuits
• Intake air leak
• Contaminated/deteriorated fuel
• Faulty injector
• IACV air passage clogged
• Faulty ignition system
Engine stalls, hard to start,
rough idling
1. Inspect the engine idle speed
(page 4-13).
2. Inspect the fuel supply system
(page 6-32).
3. Inspect the ignition system
(page 19-5).
• IACV air passage clogged
• Restricted fuel feed hose
• Contaminated/deteriorated fuel
• Intake air leak
• Restricted fuel tank breather hose
• Faulty ignition system
• Low cylinder compression
Backfiring or misfiring dur-
ing acceleration
1. Inspect the ignition system
(page 19-5).
• Faulty ignition system
Poor performance (drive-
ability) and poor fuel econ-
omy
1. Inspect the fuel supply system
(page 6-32).
2. Inspect the injector.
3. Inspect the ignition system
(page 19-5).
4. Inspect the cylinder compres-
sion (page 9-6).
• Air cleaner element contaminated
• Pinched or clogged fuel feed hose
• Faulty pressure regulator in the fuel pump
unit
• Faulty injector
• Faulty ignition system
• Low cylinder compression
MIL stays ON, or MIL never
comes ON at all (Engine
operates normally)
1. Troubleshoot the MIL circuit
(page 6-31).
• Faulty MIL circuit
MIL stays ON
(Engine operates normally
and No MIL code set)
1. Inspect the DLC circuit (Brown
wire) for short circuit.
• Short circuit in the DLC related wire

Honda NHX110 Specifications

General

Brand	Honda
Model	NHX110
Category	Scooter
Language	English