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 .

DIAGNOSTIC PROCEDURES

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 Ω 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 Ω 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 Ω 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 Ω 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 Ω 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 .