6B2-4 ENGINE COOLING (M13 ENGINE)
Diagnosis
Diagnosis Table
System Circuit Inspection
Refer to “Table B-7 Radiator Fan Control System Check” in Section 6-2
Condition Possible Cause Correction
Engine overheats
(It is in case that radia-
tor 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 nec-
essary.
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.
Wiring or grounding faulty Repair and necessary.
Equipped with too much electric load part(s) Dismount.
Radiator cooling fan motor faulty Check and replace as necessary.
Engine overheats
(It is in case that radia-
tor fan won’t operates)
Fuse blown Check 30A fuse of relay/fuse box
and check for short circuit to
ground.
Radiator cooling fan relay 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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