1F-4 Engine Cooling System:
Diagnostic Information and Procedures
Engine Cooling Symptom Diagnosis
B815H21604001
Repair Instructions
Cooling Circuit Inspection
B815H21606001
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 right side cowling. Refer to “Exterior
Parts Removal and Installation in Section 9D
(Page 9D-14)”.
2) Remove the radiator cap (1) and connect the
radiator tester (2) to the filler.
3) Pressurize the cooling system with 110 kPa (1.1 kgf/
cm, 15.6 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.
4) After finishing the cooling circuit inspection, reinstall
the removed parts.
Condition Possible cause Correction / Reference Item
Engine overheats Not enough engine coolant. Add engine coolant.
Radiator core clogged with dirt or scale. Clean.
Faulty cooling fan. Repair or replace.
Defective cooling fan relay, or open-or-
short circuited.
Repair or replace.
Clogged water passage. Clean.
Air trapped in the cooling circuit. Bleed air.
Defective water pump. Replace.
Use of incorrect engine coolant. Replace.
Defective thermostat. Replace.
Defective ECT sensor. Replace.
Defective ECM. Replace.
Damaged ISC valve. Replace.
ISC bad learning. Reset learned value.
Engine over cools Defective cooling fan relay, or open-or-
short circuited.
Repair or replace.
Extremely cold weather. Put on radiator cover.
Defective thermostat. Replace.
Defective ECT sensor. Replace.
Defective ECM. Replace.
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I815H1160001-01
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I815H1160002-01
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