Radiator Cooling Fan Low Speed Control - Suzuki 2006 SX4 Service Manual

1A-166 Engine General Information and Diagnosis:
Troubleshooting
WARNING
!
Keep hands, tools, and clothing away from radiator cooling fan to help prevent personal injury. This
fan is electric and can come on whether or not the engine is running. The fan can start automatically in
response to the ECT sensor with the ignition switch at the "ON" position.
NOTE
• Before performed troubleshooting, be sure to read the "Precautions of ECM Circuit Inspection".
• When measuring circuit voltage, resistance and/or pulse signal at ECM connector, connect the
special tool to ECM and/or the ECM connectors referring to "Inspection of ECM and Its Circuits".
Step
1 Is there DTC(s) of ECT sensor circuit (DTC P0116 / P0117 /
P0118) and/or radiator cooling fan circuit (DTC P0480)?
2 Low speed radiator cooling fan control circuit check
1) Connect scan tool to DLC with ignition switch turned
OFF.
2) Start engine and select "Data List" mode on scan tool.
3) Warm up engine until coolant temp. is 97 °C, 206.6 °F or
higher and A/C switch turns OFF. (If engine coolant
temp. dose not rise, check engine cooling system or
ECT sensor.)
Is radiator cooling fan started at low speed when engine
coolant temp. reached above temp.?
3 Radiator cooling fan control check
1) Disconnect radiator cooling fan relays No. 2 and No. 3
from fuse box No.2 with ignition switch turned OFF.
2) Run engine when ECT is over 97 °C, 206.6 °F.
3) Measure voltage between vehicle body ground and
"BLU/RED" wire terminal of disconnected radiator
cooling fan motor connector.
Is voltage 10 – 14 V?
4 Check radiator cooling fan wire circuit check
1) Turn ignition switch to OFF position.
2) Measure resistance between "BLK" wire terminal of
disconnected radiator cooling fan motor connector and
vehicle body ground.
Is resistance below 1
5 Radiator cooling fan check
1) Check radiator cooling fan referring to "Radiator Cooling
Fan Assembly Inspection in Section 1F".
Is it in good condition?
Action
Ω
?
Yes
Go to corresponding
DTC flow.
Radiator cooling fan low
speed control system is
in good condition.
Go to Step 4.
Go to Step 5.
Substitute a known-
good ECM and recheck.
No
Go to Step 2.
Perform from Step 2 to
Step 6 of "DTC P0480:
Fan 1 Control Circuit".
If OK, Go to Step 3.
"BLU/RED" wire is open
or high resistance
circuit.
"BLK" wire is open or
high resistance circuit.
Faulty radiator cooling
fan.