MARUTI SUZUKI Wagon R, Manual

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1F-2 Engine Cooling System:
Diagnostic Information and Procedures
Engine Cooling System Symptom Diagnosis
AENAR90A1604001
Radiator Cooling Fan Control System Check
AENAR90A1604002
Wiring Diagram
Refer to “Radiator Cooling Fan Control System Circuit Diagram”: about circuit diagram.
Troubleshooting
WARNING
!
Keep hands, tools, and clothing away from radiator cooling fan to prevent personal injury. This fan is
driven by electric motor that can turn on whether or not the engine is running. The fan motor can start
automatically in response to ECT sensor signal if ignition switch is at “ON” position.
[A]: Engine is cool (thermostat closed) 4. Throttle body outlet hose 11. Heater core
[B]: Engine is normal operating temperature (thermostat open) 5. Thermostat 12. Radiator
[C]: Petrol model 6. Water pump 13. LPG pressure regulator
[D]: Bi-Fuel LPG model 7. Throttle body 14. LPG pressure regulator water inlet hose
1. Radiator inlet hose 8. Engine 15. LPG pressure regulator water outlet hose
2. Radiator outlet hose 9. Heater core inlet hose
3. Throttle body inlet hose 10. Heater core outlet hose
Condition Possible cause Correction / Reference Item
Engine overheats
(Radiator fan operates) Loose or broken water pump / generator
drive belt Check water pump / generator drive belt.
)
Not enough coolant Check coolant level and add as necessary.
)
Faulty thermostat Check thermostat.
)
Faulty water pump Check water pump.
)
Dirty or bent radiator fins Clean or remedy.
)
Coolant leakage on cooling system Check cooling system for leakage.
)
Clogged radiator Replace radiator.
)
Faulty radiator cap Check radiator cap.
)
Dragging brakes Check brake.
)
Slipping clutch Check clutch.
)
Poor charged battery Check battery.
)
Poor electricity generated by generator Check generator.
)
ECT sensor faulty Check ECT sensor.
)
Radiator cooling fan motor faulty Check radiator cooling fan motor.
)
Wiring or grounding faulty Repair wiring.
Equipped with too many additional
electrical part(s) Dismount them.
Engine overheats
(Radiator fan does not
operate) Fuse blown Check fuse.
Radiator cooling fan relay faulty Check radiator cooling fan relay.
)
ECT sensor faulty Check ECT sensor.
)
Radiator cooling fan motor faulty Check radiator cooling fan motor.
)
Wiring or grounding faulty Repair as necessary.
ECM faulty Check ECM and its circuit.
Petrol model: Reference “Inspection of ECM
and Its Circuit: Petrol Model” in Section 1A in
related manual mentioned in the Foreword of
this manual.
Bi-Fuel LPG model:
)