Diagnostic Information And Procedures; Engine Cooling Symptom Diagnosis; Repair Instructions; Cooling Circuit Inspection - Suzuki GSF1250 Service Manual

1F-4 Engine Cooling System:

Engine Cooling Symptom Diagnosis

Condition
Engine overheats
Engine over cools

Cooling Circuit Inspection

WARNING
!
• Do not open the radiator cap when the
engine is hot, as you may be injured by
escaping hot liquid or vapor.
• When removing the radiator cap tester, put
a rag on the filler to prevent the engine
coolant from spraying out.
Inspect the cooling circuit in the following procedures:
1) Remove the fuel tank. Refer to "Fuel Tank Removal
and Installation in Section 1G (Page 1G-9)".
2) Remove the radiator cap (1) and connect the
radiator tester (2) to the filler.
3) Pressurize the cooling system with 120 kPa (1.2 kgf/
cm, 17 psi) of pressure, and then check if it holds the
pressure for 10 seconds.
CAUTION
!
Do not exceed the radiator cap release
pressure, or the radiator cap and
subsequently the radiator, can be damaged.

Diagnostic Information and Procedures

Possible cause
Not enough engine coolant.
Radiator core clogged with dirt or scale. Clean.
Faulty cooling fan.
Defective cooling fan relay, or open-or-
short circuited.
Clogged water passage.
Air trapped in the cooling circuit.
Defective water pump.
Use of incorrect engine coolant.
Defective thermostat.
Defective ECT sensor.
Defective ECM.
Damaged ISC valve.
ISC bad learning.
Defective cooling fan relay, or open-or-
short circuited.
Extremely cold weather.
Defective thermostat.
Defective ECT sensor.
Defective ECM

Repair Instructions

B718H11606012
Correction / Reference Item
Add engine coolant.
Repair or replace.
Repair or replace
Clean.
Bleed air.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Reset learned value.
Repair or replace
Put on radiator cover.
Replace.
Replace.
Replace.
4) After finishing the cooling circuit inspection, reinstall
the removed parts.
B718H11604001
1
I718H1160032-01
I705H1160004-01