1A-253 Engine General Information and Diagnosis:
Radiator Cooling Fan High Speed Control System Check
S5JB0A1104072
Wiring Diagram
Refer to “Radiator Cooling Fan Low Speed Control System Check: ”.
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
• 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: ”.
15
Radiator cooling fan relay check
1) Check radiator cooling fan relay referring to “Radiator
Cooling Fan Relay Inspection: in Section 1F”.
Is it in good condition?
Substitute a known-
good ECM and recheck.
Replace radiator cooling
fan relay.
16
Radiator cooling fan motor check
1) Check radiator cooling fan motor referring to “Radiator
Cooling Fan Motor On-Vehicle Inspection: in Section
1F”.
Is it in good condition?
Substitute a known-
good ECM and recheck.
Replace radiator cooling
fan motor.
Step
Action
Yes
No
Step
Action
Yes
No
1
Is there DTC(s) of ECT sensor circuit (DTC P0116 / P0117 /
P0118) and/or radiator cooling fan circuit (DTC P0480)?
Go to corresponding
DTC flow.
Go to Step 2.
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.?
Go to Step 3.
Perform from Step 2 to
Step 5 in “Radiator
Cooling Fan Low Speed
Control System Check:
”.
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?
Radiator cooling fan
control system is in
good condition.
Perform from Step 8 to
Step 19 in DTC P0480
diag. flow.
If OK, Go to Step 4.
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