Engine Cooling System: 1F-3
Diagnostic Information and Procedures
Engine Cooling Symptom Diagnosis
S5JB0A1604001
Condition
Possible cause
Correction / Reference Item
Engine overheats
(Radiator fan operates)
Loose or broken water pump belt
Adjust or replace.
Not enough coolant
Check coolant level and add as necessary.
Faulty thermostat
Replace.
Faulty water pump
Replace.
Dirty or bent radiator fins
Clean or remedy.
Coolant leakage on cooling system
Repair.
Clogged radiator
Check and replace radiator as necessary.
Faulty radiator cap
Replace.
Improper ignition timing
Adjust.
Dragging brakes
Adjust brake.
Slipping clutch
Adjust or replace.
Poor charge battery
Check and replace as necessary.
Poor generation generator
Check and repair.
ECT sensor faulty
Check and replace as necessary.
Radiator cooling fan relay No.2 and/or
No.3 faulty
Check and replace as necessary.
Radiator fan motor faulty
Check and replace as necessary.
ECM faulty
Check and replace as necessary.
Wiring or grounding faulty
Repair as necessary.
Equipped with too much electric load
part(s)
Dismount.
Engine overheats
(Radiator fan does not
operate)
Fuse blown
Check 15 A fuse of relay/fuse box and check
for short circuit to ground.
Radiator cooling fan relay No.1 faulty
Check and replace as necessary.
ECT sensor faulty
Check and replace as necessary.
Radiator cooling fan motor faulty
Check and replace as necessary.
Wiring or grounding faulty
Repair as necessary.
ECM faulty
Check and replace as necessary.
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