Radiator Cooling Fan Control System Check

Radiator Cooling Fan Control System Check

Refer to Radiator Cooling Fan Control System Circuit Diagram 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 Description and Operation Cooling Fan Operation Description.
- Before beginning troubleshooting, be sure to read "Precautions for ECM Circuit Inspection" under Service Precautions Precautions for Engine.
- When measuring circuit voltage, resistance and/or pulse signal of ECM, connect the special tool between ECM and ECM connectors. Pinout Values and Diagnostic Parameters



1. DTC Check
Confirm that ignition mode of keyless push start system is in "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)?
YES
Go to applicable DTC flow and recheck DTC.
NO
Go to Step 2.
2. Radiator cooling fan low mode control check
Check radiator cooling fan control for low mode. Radiator Cooling Fan Assembly On-Vehicle Inspection
Is it in good condition?
YES
Go to Step 3.
NO
Go to Step 6.
3. Radiator cooling fan mid and high mode control check
Check radiator cooling fan control for mid and high mode. Radiator Cooling Fan Assembly On-Vehicle Inspection
Is it in good condition?
YES
Radiator cooling fan control system is in good condition.
NO
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 in "OFF".
Remove radiator cooling fan relay No.3 from main fuse box.
Check 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. Radiator Cooling Fan Control System Circuit Diagram
Is it 10 - 14 V?
YES
Go to Step 5.
NO
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 in "OFF".
Remove radiator cooling fan relay No.2 from main fuse box.
Check 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. Radiator Cooling Fan Control System Circuit Diagram
Is resistance 3 or less?
YES
Go to Step 6.
NO
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 in "OFF".
Remove radiator cooling fan relay No.1 from main fuse box.
Check 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?
YES
Go to Step 7.
NO
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. Testing and Inspection
Is it in good condition?
YES
Go to Step 8.
NO
Replace faulty radiator cooling fan relay.
8. Sub fan motor drive circuit check
Confirm that ignition mode of keyless push start system is in "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
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?
YES
Go to Step 9.
NO
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
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?
YES
Go to Step 10.
NO
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 in "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
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?
YES
Go to Step 11.
NO
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 or less?
YES
Go to Step 12.
NO
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. Radiator Cooling Fan Assembly On-Vehicle Inspection
Is it in good condition?
YES
Replace ECM and recheck DTC. Service and Repair
NO
Replace main fan motor or sub fan motor. Removal and Replacement