Suzuki VLR1800 Service Manual

Fuel System: 1G-3
Diagnostic Information and Procedures
Fuel System Diagnosis
B822H11704001
Condition Possible cause Correction / Reference Item
Engine will not start or is
hard to start (No fuel
reaching the intake
manifold)
Clogged fuel filter or fuel hose. Clean or replace.
Defective fuel pump. Replace.
Defective fuel pressure regulator. Replace.
Defective fuel injectors. Replace.
Defective fuel pump relay. Replace.
Defective ECM. Replace.
Open-circuited wiring connections. Check and repair.
Engine will not start or is
hard to start (Incorrect
fuel/air mixture)
Defective fuel pump. Replace.
Defective fuel pressure regulator. Replace.
Defective TP sensor. Replace.
Defective CKP sensor. Replace.
Defective IAP sensor. Replace.
Defective ECM. Replace.
Defective ECT sensor. Replace.
Defective IAT sensors. Replace.
Dirty throttle body. Clean.
Engine stalls often
(Incorrect fuel/air mixture)
Defective IAP sensor or circuit. Repair or replace.
Clogged fuel filter. Clean or replace.
Defective fuel pump. Replace.
Defective fuel pressure regulator. Replace.
Damaged or cracked vacuum hose. Replace.
Defective ECT sensor. Replace.
Defective thermostat. Replace.
Defective IAT sensor. Replace.
Engine stalls often (Fuel
injector improperly
operating)
Defective fuel injectors. Replace.
No injection signal from ECM. Repair or replace.
Open or short circuited wiring
connection.
Repair or replace.
Defective battery or low battery voltage. Replace or recharge.
Engine runs poorly in
high speed range
(Defective control circuit
or sensor)
Low fuel pressure. Repair or replace.
Defective TP sensor. Replace.
Defective IAT sensor. Replace.
Defective IAP sensor. Replace.
Defective ECM. Replace.
Defective STP sensor or STVA. Replace.
Defective GP switch. Replace.
Defective CKP sensor. Replace.
Defective ISC valve. Replace.
TP sensor out of adjustment. Adjust or replace.
Engine lacks power
(Defective control circuit
or sensor)
Low fuel pressure. Repair or replace.
Defective TP sensor. Replace.
Defective IAT sensor. Replace.
Defective CKP sensor. Replace.
Defective GP switch. Replace.
Defective IAP sensor. Replace.
Defective ECM. Replace.
Defective STP sensor or STVA. Replace.
Defective ISC valve. Replace.
TP sensor out of adjustment. Adjust or replace.

Suzuki VLR1800 Specifications

General

Manufacturer	Suzuki
Model	VLR1800
Compression Ratio	10.5:1
Fuel System	Fuel injection
Starter	Electric
Transmission	5-speed
Category	Cruiser
Displacement	1783 cc
Ignition	Electronic ignition (Transistorized)
Final Drive	Shaft
Front Suspension	Telescopic, coil spring, oil damped
Rear Suspension	Link type, coil spring, oil damped
Rear Brakes	Single disc
Ground Clearance	140 mm
Seat Height	705 mm