Intake air temperature sensor resistance

2.21 ~ 2.69 k Ω at 20 °C (68 °F)

			WARNING
		• Handle the intake air temperature sensor
			with special care.
		• Never subject the intake air temperature sen-
			sor to strong shocks. If the intake air temper-
			ature sensor is dropped, replace it.
		4. Is the intake air temperature sensor OK?
	Open or short circuit in wiring har-	Repair or replace if there is an open or short circuit.
	ness.	Between sensor coupler and ECU (engine) coupler
			black/blue – black/blue
			brown/white – brown/white
	Connected condition of connector	If there is a malfunction, repair it and connect it
	Inspect the coupler for any pins	securely.
	that may have pulled out.		Intake air temperature sensor coupler
	Check the locking condition of the		Main wiring harness ECU (engine) coupler
	coupler.

 

7 - 17

				FUEL INJECTION SYSTEM			FI
Fault code No.		Symptom No normal signal is received from the O2 sensor.
Used diagnostic code No. --
Order	Inspection operation item and	Operation item and countermeasure	Reinstatement
	probable cause					method
	Installed state of O2 sensor	Check the installed area for looseness or pinching.	As the returning
							method start
	Connected state of connector	Check the coupler for any pins that may have pulled
method, start and
	O2 sensor coupler	out. Check the locking condition of the coupler. If
	warm up the
	Main wiring harness ECU	there is a malfunction, repair it and connect it
	engine until the
	(engine) coupler		securely.
		coolant tempera-
	Open or short circuit in wiring har-	Repair or replace if there is an open or short circuit.	ture rises over
	ness			Between O2 sensor coupler and ECU (engine) cou-	60 °C (140 °F).
				pler	Then, maintain the
				black/blue – black/blue	engine speed at
				gray/green – gray/green	2,000 r/min to
				red/blue – red/blue	3,000 r/min until
				black – black	the warning light
							goes off. When the
	Check fuel pressure	Refer to “CHECKING THE FUEL PUMP OPERA-
warning light goes
				TION”.
				off, the reset oper-
	Defective O2 sensor	Replace if defective.	ation is finished.

 

7 - 18

FUEL INJECTION SYSTEM

FI

Fault code No.

Symptom

The scooter has overturned.

Used diagnostic code No. 08 (lean angle cut-off switch)

Order

Inspection operation item and

Operation item and countermeasure

Reinstatement

probable cause

method

Defective lean angle cut-off switch

Replace if defective.

Reinstated by turn-

1.

Remove the lean angle cut-off switch from the

ing the main switch

scooter.

ON (however, the

2.

Connect the lean angle cut-off switch coupler to

engine cannot be

the wire harness.

restarted unless

3.

Connect the pocket tester (DC 20 V) to the lean

the main switch is

angle cut-off switch coupler as shown.

first turned OFF).

Positive tester probe→blue1

Negative tester probe→yellow/green2

4. When turn the lean angle cut-off switch approx.

45°, the voltage reading change from 0.9 V to

4.1 V.

5. Is the emergency stop switch OK?

The scooter has overturned.

Raise the scooter upright.

Installed condition of the lean

Check the installed area for looseness or pinching.

angle cut-off switch

Connected condition of connector

If there is a malfunction, repair it and connect it

Inspect the coupler for any pins

securely.

that may have pulled out.

Lean angle cut-off switch coupler

Check the locking condition of the

Main wiring harness ECU (engine) coupler

coupler.

Fault code No.

Symptom

Malfunction detected in the primary lead of the ignition coil.

Used diagnostic code No. 30 (ignition coil)

Order

Inspection operation item and

Operation item and countermeasure

Reinstatement

probable cause

method

Defective ignition coil (test the pri-

Replace if defective.

Reinstated by

mary and secondary coils for conti-

Refer to “IGNITION SYSTEM” in chapter 8.

starting the engine

nuity)

and operating it at

idle.

Open or short circuit in lead.

Repair or replace if there is an open or short circuit.

In case of multiple

Between ignition coil coupler and ECU (engine) cou-

cylinder open or

pler/ main harness

short circuit in lead,

orange – orange

make sure to turn

red/black – red/black

ON and OFF the

Connected condition of connector

If there is a malfunction, repair it and connect it

main switch after

Inspect the coupler for any pins

securely.

each time of crank-

that may have pulled out.

Ignition coil primary side coupler – orange

ing.

Check the locking condition of the

Main wiring harness ECU (engine) coupler

coupler.

7 - 19

					FUEL INJECTION SYSTEM			FI
Fault code No.		Symptom	Engine idling speed is too high.
Used diagnostic code No. 01 (throttle position sensor)
Order	Inspection operation item and		Operation item and countermeasure	Reinstatement
	probable cause						method
	Stuck FID valve detected.		Inspect the throttle body.	Reinstated by
					Replace if defective.	starting the engine
					Refer to “THROTTLE BODY”.	and operating it at
								idle for about 5
	Defective throttle fully closed.		Inspect the throttle body.
	minutes. Do not
					Replace if defective.
					turn the throttle
					Refer to “THROTTLE BODY”.
					grip.
Fault code No.		Symptom	Open or short circuit detected in the lean angle cut-off switch.
Used diagnostic code No. 08 (lean angle cut-off switch)
Order	Inspection operation item and		Operation item and countermeasure	Reinstatement
	probable cause						method
	Defective lean angle cut-off switch	Replace if defective.	Reinstated by turn-
					Refer to “Fault code No. 30”.	ing the main switch
								ON.
	Open or short circuit in wiring har-	Repair or replace if there is an open or short circuit.
	ness.				Between switch coupler and ECU (engine) coupler
					black/blue – black/blue
					yellow/green – yellow/green
					blue – blue
	Connected condition of connector	If there is a malfunction, repair it and connect it
	Inspect the coupler for any pins	securely.
	that may have pulled out.		Lean angle cut-off switch coupler
	Check the locking condition of the	Main wiring harness ECU (engine) coupler
	coupler.

 

7 - 20

FUEL INJECTION SYSTEM

FI

Fault code No.

Symptom The ECU (engine) is unable to monitor the battery voltage.

Used diagnostic code No. 09 (fuel system voltage)

Order

Inspection operation item and

Operation item and countermeasure

Reinstatement

probable cause

method

Malfunction in ECU (engine)

Fuel injection system relay is on.

Reinstated by

starting the engine

Open or short circuit in the wiring

Repair or replace if there is an open or short circuit.

and operating it at

harness.

Between starting circuit cut-off relay (fuel injection

idle.

system relay), fuel pump, fuel injector (#1, #2)

red/blue – red/blue

Malfunction or open circuit in fuel

Replace if defective.

injection system relay

1. Disconnect the fuel injection system relay from

the wire harness.

2. Connect the pocket tester (Ω Ч 1) and battery

(12 V) to the fuel injection system relay terminals

as shown.

Positive battery terminal→red/black1

Negative battery terminal→blue/yellow2

Positive tester probe→red/blue3

Negative tester probe→red/blue4

R/L

R/B

R/L

R/L

R/B

L/Y

R/L

L/Y

3. Does the fuel injection system relay have conti-

nuity between red/blue and red/blue?

Connected condition of connector

If there is a malfunction, repair it and connect it

Inspect the coupler for any pins

securely.

that may have pulled out.

Fuel injection system relay coupler

Check the locking condition of the

ECU (engine) coupler

coupler.

 

 

7 - 21

					FUEL INJECTION SYSTEM			FI
Fault code No.		Symptom	Error is detected while reading or writing on EEPROM (CO adjustment value).
Used diagnostic No. 60 (EEPROM improper cylinder indication)
Order	Inspection operation item and		Operation item and countermeasure	Reinstatement
	probable cause							method
	Malfunction in ECU (engine)		Execute diagnostic code 60	Reinstated by turn-
					• Check the faulty cylinder. (If there are multiple	ing the main switch
						cylinders, the number of the faulty cylinders	ON.
						appear alternately at 2-second intervals.)
					•	Readjust the CO of the displayed cylinder.
						Refer to “ADJUSTING THE EXHAUST GAS
						VOLUME” in chapter 3. Replace ECU (engine)
						if defective.
Fault code No.		Symptom	Power supply to the fuel pump relay is not normal.
Used diagnostic code No. – –
Order	Inspection operation item and		Operation item and countermeasure	Reinstatement
	probable cause							method
	Faulty battery			Replace or change the battery	Reinstated by
					Refer to “CHECKING AND CHARGING THE BAT-	starting the engine
					TERY” in chapter 3.	and operating it at
									idle.
	Open or short circuit in wiring har-	Repair or replace if there is an open circuit.
	ness.				•	Between battery and main switch
						red – red
					•	Between main switch and fuse (ignition)
						brown/blue – brown/blue
					•	Between fuse (ignition) and ECU (engine)
						red/white – red/white
	Connected condition of connector	If there is a malfunction, repair it and connect it
	Inspect the coupler for any pins	securely.
	that may have pulled out.		ECU (engine) coupler
	Check the locking condition of the
	coupler.

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