Pgm-fi symptom troubleshooting

 

When the motorcycle has one of these symptoms, check the MIL blinking, refer to the MIL code index (page 4-7) and begin the appropriate troubleshooting procedure. If there are MIL blinking stored in the ECM memory, do the diagnostic procedure for the symptom, in sequence listed below, until you find cause.

 

Symptom		Diagnosis procedure		Also check for
Engine cranks but won’t start	1.	Inspect the IACV (page 7-16).	•	No fuel to injector
(No MIL blinking)	2.	Inspect the fuel supply system (page 7-4).		– Clogged fuel filter
	3.	Inspect the ignition system (page 5-4).		– Pinched or clogged fuel feed
				hose
				– Faulty fuel pump
				– Faulty fuel pump circuits
			•	Intake air leak
			•	Contaminated/deteriorated fuel
			•	Faulty injector
Engine cranks but won’t start	1.	ECM power/ground circuits malfunction	•	Open circuit in the power input
(No fuel pump operation sound		(page 4-49).		and/or ground wire of the ECM
when the turning the ignition	2.	Inspect the fuel supply system (page 7-4).	•	Blown main fuse (30 A)
ON)			• Blown FI, IGN fuse (10 A)
Engine stalls, hard to start,	1.	Inspect the engine idle speed (page 3-10).	•	Restricted fuel feed hose
rough idling	2.	Inspect the IACV (page 7-16).	•	Contaminated/deteriorated fuel
	3.	Inspect the fuel supply system (page 7-4).	•	Intake air leak
	4.	Inspect the battery charging system (page	•	Faulty MAP sensor
		19-4).	•	Restricted fuel tank breather hose
	5.	Inspect the ignition system (page 5-4).
Afterburn when engine braking	1.	Inspect the PAIR system (page 7-17).
is used	2.	Inspect the ignition system (page 5-4).
Backfiring or misfiring during	Inspect the ignition system (page 5-4).
acceleration
Poor performance (driveability)	1.	Inspect the fuel supply system (page 7-4).	•	Faulty pressure regulator (fuel
and poor fuel economy	2.	Inspect the air cleaner element (page 3-4).		pump)
	3.	Inspect the ignition system (page 5-4).	•	Faulty injector
			•	Faulty MAP sensor
Idle speed is below	1.	Inspect the engine idle speed (page 3-10).
specifications or fast idle too low	2.	Inspect the IACV (page 7-16).
(No MIL blinking)	3.	Inspect the ignition system (page 5-4).
Idle speed is above	1.	Inspect the engine idle speed (page 3-10).	•	Intake air leak
specifications or fast idle too	2.	Inspect the throttle operation and freeplay	•	Engine top-end problem
high (No MIL blinking)		(page 3-3).	•	Air cleaner element condition
	3.	Inspect the IACV (page 7-16).
	4.	Inspect the ignition system (page 5-4).
MIL never comes ON at all	Inspect the MIL circuit (page 4-43).
MIL stays ON	1.	Inspect the DLC circuit (page 4-43).
(No DTC set)	2.	Inspect the MIL circuit (page 4-43).

 

 

4-6

PGM-FI SYSTEM

DTC INDEX

 

DTC				Refer	Refer
(MIL	Function Failure		Symptom/Fail-safe function	to	to
blinks)				(DTC)	(MIL)
	MAP sensor circuit low voltage (less than 0.195 V)	•	Engine operates normally
1-1 (1)	• MAP sensor or its circuit malfunction	•	Pre-program value: 525 mmHg/	4-10
			700 hPa		4-29
	MAP sensor circuit high voltage (more than 3.848 V)	•	Engine operates normally
1-2 (1)	• Loose or poor contact of the sensor unit	• Pre-program value: 525 mmHg/	4-11
connector		700 hPa
	• MAP sensor or its circuit malfunction
	ECT sensor circuit low voltage (less than 0.078 V)	• Hard start at a low temperature
7-1 (7)	• ECT sensor or its circuit malfunction	•	Pre-program value: 80°C/176°F	4-13
		• Cooling fan turns on		4-30
	ECT sensor circuit high voltage (more than 4.922 V)	•	Hard start at a low temperature
7-2 (7)	• Loose or poor contact of the ECT sensor	•	Pre-program value: 80°C/176°F	4-11
connector	• Cooling fan turns on
	• ECT sensor or its circuit malfunction
	TP sensor circuit low voltage (less than 0.215 V)	•	Poor engine acceleration
8-1 (8)	• Loose or poor contact of the sensor unit	•	Pre-program value: 0°	4-15
connector			4-32
	• TP sensor or its circuit malfunction
8-2 (8)	TP sensor circuit high voltage (more than 4.922 V)	•	Poor engine acceleration	4-16
• TP sensor or its circuit malfunction	•	Pre-program value: 0°
9-1 (9)	IAT sensor circuit low voltage (less than 0.078 V)	•	Engine operates normally	4-18
• IAT sensor or its circuit malfunction	•	Pre-program value: 35°C/95°F
	IAT sensor circuit high voltage (more than 4.922 V)	•	Engine operates normally		4-33
9-2 (9)	• Loose or poor contact of the sensor unit	•	Pre-program value: 35°C/95°F	4-18
connector
	• IAT sensor or its circuit malfunction
	VS sensor malfunction	•	Engine operates normally
11-1	• Loose or poor contact of the VS sensor			4-18	4-35
(1)	connector
	• VS sensor or its circuit malfunction
12-1	Injector circuit malfunction	• Engine does not start
• Loose or poor contact of the injector connector	•	Injector, fuel pump and ignition	4-21	4-36
(12)
• Injector or its circuit malfunction		coil shut down
21-1	O2 sensor malfunction	•	Engine operates normally
• Loose or poor contact of the O2 sensor connector			4-23	4-38
(21)
• O2 sensor or its circuit malfunction
29-1	IACV circuit malfunction	• Engine stalls, hard to start,
• Loose or poor contact of the IACV connector		rough idling	4-24	4-39
(29)
• IACV or its circuit malfunction
33-2 (–	ECM EEPROM malfunction	•	Engine operates normally	4-26	–
)
	Bank angle sensor circuit low voltage (less than	•	Engine operates normally
54-1	0.35 V)	• Bank angle sensor does not
• Bank angle sensor or its circuit malfunction		operate.	4-27
(54)
		(The engine keeps running
			when the vehicle falls.)		4-41
	Bank angle sensor circuit high voltage (more than	•	Engine operates normally
54-2	4.5 V)	• Bank angle sensor does not
• Loose or poor contact of the bank angle sensor		operate.	4-28
(54)
connector		(The engine keeps running
	• Bank angle sensor or its circuit malfunction		when the vehicle falls.)

 

 

4-7

PGM-FI SYSTEM

SENSOR UNIT POWER LINE

INSPECTION

 

BEFORE DTC TROUBLESHOOTING

• When the DTC displays 1-1, 1-2, 8-1, 8-2, 9-1 and 9-2, check the following before DTC troubleshooting.

 

• Before starting the inspection, check for loose or poor contact on the sensor unit 5P connector and ECM 33P (Black) connector.

5 V

 

SENSOR UNIT

 

Y/R

 

 

ECM

 

G/W

 

 

Probable cause

• Open circuit in Yellow/red wire between the sensor unit and ECM

 

• Open circuit in Green/white wire between the sensor unit and ECM

 

• Faulty ECM