Mazda 2002 6 Workshop Manual page 365

4. Inspect if the operation sound is heard from the cooling fan relay.
• If the operation sound is heard, inspect the wiring harness, connectors and cooling fan motor.
• If the operation sound is not heard, inspect cooling fan relay and open circuit wiring harness and
connectors.
8. Turn the A/C switch and fan switch on.
9. Verify that cooling fan is operating.
• If fan does not operate, inspect A/C system.
Cooling fan relay No.2
1. Verify that A/C switch and fan switch are off.
2. Start the engine and let it idle.
3. Verify that the cooling fan No.2 is not operating.
• If condenser fan is operating, inspect for the following.
— Cooling fan relay No.2 is stuck in closed position.
— Short to power in circuit between condenser fan relay and condenser fan
— Short to GND in circuit between refrigerant pressure switch and PCM terminal 1AC
— Short to GND circuit between condenser fan relay and PCM terminal 4B
4. Turn the A/C switch and fan switch on.
5. Verify that the cooling fan No.2 is operating and operation sound of A/C compressor magnetic clutch is heard.
6. Turn the A/C switch and fan switch off.
• If the cooling fan No.2 does not operate but operation sound of A/C compressor magnetic clutch is heard,
inspect for the following.
— Open circuit between ignition switch and cooling fan relay No.2
— Open circuit between battery and cooling fan relay No.2
— Open circuit between cooling fan relay No.2 and PCM terminal 4B
— Open circuit between cooling fan relay No.2 and cooling fan motor No.2 or fan motor GND
— Cooling fan relay No.2 is stuck open.
— Cooling fan motor No.2
• If both cooling fan No.2 and A/C compressor do not operate, inspect the following.
— TP PID
— A/C system
L3 engine models
Cooling fan system operation (at idle)
Engine condition
Engine coolant temperature below
100°C {212°F}
Engine coolant temperature above
100°C {212°F} (until below 97°C
{208°F})
Engine coolant temperature above
108°C {233°F} (until below 105°C
{208°F})
Refrigerant pressure
switch (middle
A/C and fan
pressure) is off.
switches are
Refrigerant pressure
on.
switch (middle
pressure) is on.
ECT sensor malfunction
1. Connect WDS or equivalent to DLC-2.
2. Verify that ECT PID is below cooling fan operating temperature.
3. Verify that the A/C switch and fan switch are off.
4. Start the engine and let it at idle.
5. Verify that the cooling fan and condenser fan are not operating.
• If the cooling fan and condenser fan are operating low speed, inspect for following:
— Short to GND circuit between PCM terminal 4L and cooling fan relay No.2
— Cooling fan relay No.2 stuck in closed position
• If the cooling fan and condenser fan are operating high speed, inspect for following:
— DTC for ECT sensor (P0117, P0118)
TROUBLESHOOTING
Cooling fan Cooling fan
relay No.1 relay No.2
OFF OFF
OFF ON
ON ON
OFF ON
ON ON
ON ON
Cooling fan Cooling fan
relay No.3 relay No.4
OFF OFF
OFF OFF
ON ON
ON OFF
OFF ON
ON ON
Cooling fan Cooling fan
motor No.1 motor No.2
OFF OFF
Low speed Low speed
High speed High speed
Low speed High speed
High speed Low speed
High speed High speed
F–235
F