Precautions for Cooling System
| WARNING | If the radiator cap is removed while the engine is hot and pressure is high, the inside coolant will instantaneously boil up and spew out. This could cause severe burns or could cause a fire if coolant is splashed over the hot engine and fenders, as the coolant contains a flammable anti-freeze material. Never check the coolant level or add coolant by removing the radiator cap. Instead, be sure to check the coolant level only on the coolant reservoir and, if necessary, add coolant to the reservoir. Also, make sure that the engine coolant temperature is cold before removing any part of cooling system. If service operations are performed on the engine cooling system with the battery connected, there is a risk of injury by accidental movement of the radiator cooling fan or other electric components. Be sure to disconnect the negative (-) cable from the battery terminal before performing any service operations on the engine cooling system. |
A/C Switch: OFF
Note. The following table indicates cooling fan operation while engine is running at 1, 250 rpm. The number of engine revolutions determines the temperature at which the cooling fan motor speed changes.
Scheme 25
Low Speed
Cooling fan operates at low speed when A/C refrigerant pressure is more than 0.34 MPa (3.5 kgf/cm 2 , 49.3 psi).
Middle Speed
Cooling fan operates at middle speed for a given time (0.5 sec.) when fan speed changes high from low.
High Speed
Cooling fan operates at high speed when A/C refrigerant pressure is more than 1.6 MPa (16.3 kgf/cm 2 , 232 psi).
Fail-Safe
Cooling fan operates at high speed when malfunction is detected by ECT sensor.
Scheme 26
Scheme 27
| Condition | Possible Cause | Action |
|---|---|---|
| Engine overheats (Radiator fan operates) | Loose or broken accessory drive belt | Check accessory drive belt, see ACCESSORY DRIVE BELT TENSION INSPECTION . |
| Not enough coolant | Check coolant level and add if necessary, see COOLANT LEVEL CHECK . | |
| Faulty thermostat | Check thermostat, see THERMOSTAT INSPECTION . | |
| Faulty water pump | Check water pump, see WATER PUMP INSPECTION . | |
| Dirty or bent radiator fins | Clean or remedy, see RADIATOR ON-VEHICLE INSPECTION AND CLEANING . | |
| Check cooling system for leakage on cooling system | Check cooling system for leakage, see ENGINE COOLING SYSTEM INSPECTION . | |
| Clogged radiator | Replace radiator, see RADIATOR REMOVAL AND INSTALLATION . | |
| Faulty radiator cap | Check radiator cap, see ENGINE COOLING SYSTEM INSPECTION . | |
| Dragging brakes | Check brake, see. BRAKE SYMPTOM DIAGNOSIS | |
| Slipping clutch | Check clutch, see CLUTCH SYSTEM SYMPTOM DIAGNOSIS . | |
| Poor charged battery | Check battery, see BATTERY INSPECTION . | |
| Poor electricity generated by generator | Check generator, see GENERATOR TEST . | |
| Faulty ECT sensor | Check ECT sensor, see ECT SENSOR INSPECTION . | |
| Faulty radiator cooling fan motor | Check radiator cooling fan motor, see RADIATOR COOLING FAN ASSEMBLY ON-VEHICLE INSPECTION . | |
| Faulty ECM | Check ECM and its circuit, see. INSPECTION OF ECM AND ITS CIRCUITS | |
| Faulty radiator cooling fan relay | Check radiator cooling fan relay, see CONTROL RELAY INSPECTION . | |
| Faulty wiring or grounding | Repair wiring . | |
| Equipped with too many additional electrical part(s) | Remove electrical parts . | |
| Engine overheats (Radiator fan does not operate) | Fuse blown | Check fuse . |
| Faulty radiator cooling fan relay | Check radiator cooling fan relay, see CONTROL RELAY INSPECTION | |
| Faulty ECT sensor | Check ECT sensor, see ECT SENSOR INSPECTION . | |
| Faulty radiator cooling fan motor | Check radiator cooling fan motor, see RADIATOR COOLING FAN ASSEMBLY ON-VEHICLE INSPECTION . | |
| Faulty wiring or grounding | Repair wiring . | |
| Faulty ECM | Check ECM and its circuit, see INSPECTION OF ECM AND ITS CIRCUITS . |
DIAGNOSTIC PROCEDURES
Radiator Cooling Fan Control System Check
Refer to RADIATOR COOLING FAN CONTROL SYSTEM CIRCUIT DIAGRAM about circuit diagram.
| WARNING | The radiator cooling fan can come on whenever the ignition switch is in the "ON" position. This electric fan starts automatically anytime the ECT sensor senses a coolant temperature higher than a predetermined level even when the engine is not running. When the ignition switch is in the ON position, be sure to keep hands, tools, clothing, and other items away from the radiator cooling fan and drive belt. |
Note. For details about engine cooling fan operation, refer to COOLING FAN OPERATION DESCRIPTION . Before beginning troubleshooting, be sure to read "Precautions for ECM Circuit Inspection" under PRECAUTIONS FOR ENGINE . When measuring circuit voltage, resistance and/or pulse signal of ECM, connect the special tool between ECM and ECM connectors, see INSPECTION OF ECM AND ITS CIRCUITS .
| Step | Action | YES | NO |
|---|---|---|---|
| 1 | DTC Check Confirm that ignition mode of keyless push start system is "OFF". Connect SUZUKI scan tool to data link connector (DLC). Push engine switch to change ignition mode to "ON" and check DTC. Is there DTC(s)? | Go to applicable DTC flow and recheck DTC. | Go to Step 2. |
| 2 | Radiator cooling fan low mode control check Check radiator cooling fan control for low mode, see RADIATOR COOLING FAN ASSEMBLY ON-VEHICLE INSPECTION . Is it in good condition? | Go to Step 3. | Go to Step 6. |
| 3 | Radiator cooling fan mid and high mode control check Check radiator cooling fan control for mid and high mode, see RADIATOR COOLING FAN ASSEMBLY ON-VEHICLE INSPECTION . Is it in good condition? | Radiator cooling fan control system is in good condition. | Go to Step 4. |
| 4 | Radiator cooling fan relay No. 3 power supply circuit (switch side) check Confirm that ignition mode of keyless push start system is "OFF". Remove radiator cooling fan relay No. 3 from main fuse box. Check for proper connection to radiator cooling fan relay No. 3 at each terminal. If OK, measure voltage between radiator cooling fan relay No. 3 power supply circuit (switch side) (A3) and ground, see RADIATOR COOLING FAN CONTROL SYSTEM CIRCUIT DIAGRAM . Is it 10 - 14 V? | Go to Step 5. | Repair or replace radiator cooling fan relay No. 3 power supply circuit (switch side). |
| 5 | Radiator cooling fan relay No. 2 ground circuit check Confirm that ignition mode of keyless push start system is "OFF". Remove radiator cooling fan relay No. 2 from main fuse box. Check for proper connection to radiator cooling fan relay No. 2 at each terminal. If OK, measure resistance between radiator cooling fan relay No. 2 ground circuit (C1) and ground. Refer to RADIATOR COOLING FAN CONTROL SYSTEM CIRCUIT DIAGRAM Is resistance 3 ohms or less? | Go to Step 6. | Repair or replace radiator cooling fan relay No. 2 ground circuit. |
| 6 | Radiator cooling fan relay No. 1 power supply circuit (switch side) check Confirm that ignition mode of keyless push start system is "OFF". Remove radiator cooling fan relay No. 1 from main fuse box. Check for proper connection to radiator cooling fan relay No. 1 at each terminal. If OK, measure voltage between radiator cooling fan relay No. 1 power supply circuit (switch side) (A1) and ground. Is it 10 - 14 V? | Go to Step 7. | Repair or replace radiator cooling fan relay No. 1 power supply circuit (switch side). |
| 7 | Radiator cooling fan relay No. 1, No. 2 and No. 3 check Check radiator cooling fan relay No. 1, No. 2 and No. 3, see CONTROL RELAY INSPECTION . Is it in good condition? | Go to Step 8. | Replace faulty radiator cooling fan relay. |
| 8 | Sub fan motor drive circuit check Confirm that ignition mode of keyless push start system is "OFF". Disconnect sub fan motor connector. Check for proper connection to sub fan motor at each terminal. If OK, check the following points. Resistance of sub fan motor drive circuit (B1): less than 3 ohms Resistance between sub fan motor drive circuit and ground: infinity Voltage of sub fan motor drive circuit: 0 - 1 V (with the ignition mode of keyless push start system in "ON") Are they in good condition? | Go to Step 9. | Repair or replace sub fan motor drive circuit. |
| 9 | Radiator cooling fan relay No. 2 power supply circuit (switch side) check Check the following points. Resistance of radiator cooling fan relay No. 2 power supply circuit (switch side) (A2): less than 3 ohms Resistance between radiator cooling fan relay No. 2 power supply circuit (switch side) and ground: infinity Voltage of radiator cooling fan relay No. 2 power supply circuit (switch side): 0 - 1 V (with the ignition mode keyless push start system in "ON") Is it in good condition? | Go to Step 10. | Repair or replace radiator cooling fan relay No. 2 power supply circuit (switch side). |
| 10 | Main fan motor drive circuit check Confirm that ignition mode of keyless push start system is "OFF". Disconnect main fan motor connector. Check for proper connection to main fan motor at each terminal. If OK, check the following points. Resistance of main fan motor drive circuit (B2): less than 3 ohms Resistance between main fan motor drive circuit and ground: infinity Voltage of main fan motor drive circuit: 0 - 1 V (with the ignition mode of keyless start push system in "ON") Is it in good condition? | Go to Step 11. | Repair or replace main fan motor drive circuit. |
| 11 | Main fan motor ground circuit check Measure resistance between main fan motor ground circuit (C2) and ground. Is resistance 3 ohms or less? | Go to Step 12. | Repair or replace main fan motor ground circuit. |
| 12 | Main fan motor and sub fan motor check Check main fan motor and sub fan motor, see RADIATOR COOLING FAN ASSEMBLY ON-VEHICLE INSPECTION . Is it in good condition? | Replace ECM and recheck DTC, see ECM REMOVAL AND INSTALLATION . | Replace main fan motor or sub fan motor, see RADIATOR COOLING FAN ASSEMBLY REMOVAL AND INSTALLATION . |
DIAGNOSTIC PROCEDURES
Scheme 28
Coolant Level Check
| WARNING | If the radiator cap is removed when the engine and radiator are still hot, extremely hot fluid and steam may spew out under pressure. This can cause severe burns. Wait until the engine coolant temperature has lowered before removing the radiator cap. |
When engine is cool, check coolant level in reservoir (1).
Normal coolant level should be between FULL mark (2) and LOW mark (3) on reservoir (1).
If coolant level is below LOW mark (3), remove reservoir cap (4) and add proper coolant to reservoir to bring coolant level up to FULL mark (2).
It is not necessary to remove radiator cap to check coolant level.
Scheme 29
| WARNING | If the radiator cap is removed when the engine and radiator are still hot, extremely hot fluid and steam may spew out under pressure. This can cause severe burns. Wait until the engine coolant temperature has lowered before removing the radiator cap. |
Scheme 30
Scheme 31
- Check cooling system for leakage or damage.
- Remove radiator cap.
- Check coolant for proper level and freeze protection.
- Check for check cooling system for leakage from cooling system using the following procedures: Attach special tool to water filler, and then apply specified pressure to cooling system. Special Tool 09918-78211 09918-78220 Cooling system holding pressure 123 kPa (1.3 kgf/cm 2 , 17.3 psi) Check that cooling system holds the pressure. If cooling system does not hold applied pressure, check cooling system for leakage.
- Check radiator cap according to the following procedure. Attach special tool to radiator cap (1), and then apply specified pressure. NOTE: Apply water or coolant to rubber seals before attaching special tool to radiator cap. Special Tool 09918-78211 09918-78220 Radiator cap valve opening pressure 93 - 123 kPa (0.9 - 1.3 kgf/cm 2 , 13.4 - 17.3 psi) If radiator cap valve opening pressure is out of specification, replace radiator cap.
- Detach special tool and rinse off spilled coolant.
- Install radiator cap on water filler.
Cleaning
Clean front area of radiator cores.