Suzuki Swift Sport 2004 Service & Repair Manual page 264

1A-214 Engine General Information and Diagnosis:
Troubleshooting
WARNING
!
Keep hands, tools, and clothing away from engine 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
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 97.5 °C, 207.5 °F
or higher and A/C switch turns OFF (if equipped with A/
C). (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 High speed radiator cooling fan control circuit check
1) Start engine and select "DATA LIST" mode on scan tool.
2) Warm up engine until coolant temp. is 102.5 °C, 216.5 °F
or higher and A/C switch turns OFF (if equipped with A/
C). (If engine coolant temp. dose not rise, check engine
cooling system or ECT sensor.)
Is radiator cooling fan started at high speed when engine
coolant temp. reached above temp?
4 Radiator cooling fan control No. 2 and No. 3 check
1) Run engine when ECT is over 102.5 °C, 216.5 °F.
2) Measure voltage between vehicle body ground and
"E23-48" terminal of ECM connector.
Is voltage lower than 1.5 V?
5 Radiator cooling fan No. 2 wire circuit check
1) Remove radiator cooling fan control relay No.2 with
ignition switch turned OFF.
2) Measure voltage between "GRY" wire terminal of
disconnected radiator cooling fan control relay No. 2
connector and vehicle body ground.
Is voltage 10 – 14 V?
6 Radiator cooling fan No. 2 wire circuit check
1) Disconnect connector from radiator cooling fan motor
with ignition switch turned OFF.
2) Measure resistance between "BLU/BLK" wire terminal of
disconnected radiator cooling fan control relay No. 2
connector and vehicle body ground.
Is resistance infinity?
Action Yes
Go to corresponding
DTC flow.
Go to Step 3.
Radiator cooling fan
control system is in
good condition.
Go to Step 5.
Go to Step 6.
Go to Step 7.
No
Go to Step 2.
Perform from Step 2 to
Step 5 in "Radiator
Cooling Fan Low Speed
Control System Check".
Perform from Step 9 to
Step 14 in DTC P0480
diag. flow.
If OK, Go to Step 4.
Faulty ECM.
"GRY" wire is open or
high resistance circuit.
"BLU/BLK" wire is
shorted to ground
circuit.