Mazda 2002 6 Workshop Manual page 366

• If the cooling fan is not operating and condenser fan is operating, inspect for following:
— Short to GND circuit between PCM terminal 4F and transfer relay
— Transfer relay stuck ON position
— Short to GND circuit between PCM terminal 4B and cooling fan relay No.3
— Condenser fan relay stuck ON
6. Start the engine.
7. Verify that the cooling fan and condenser fan are operating low speed when ECT PID is above 100°C {212°F}.
• If the cooling fans does not operate, perform the following:
1. Select FAN3 PID.
2. Operate cooling fan relay No.2 by sending ON command.
3. Inspect the operation sound is heard from cooling fan relay No.2.
— If the operation sound is heard, inspect wiring harnesses, connectors, transfer relay and cooling
and condenser fan motor.
— If the operation sound is not heard, inspect cooling fan relay No.2 and open circuit between PCM
terminal 4L and cooling fan relay No.2 wiring harness and connectors.
• Inspect the cooling fan is operating high speed, inspect the following:
— Short to GND circuit between PCM terminal 4F and cooling fan relay No.4/cooling fan relay No.1.
— Cooling fan relay stuck closed position
• If the condenser fan is operating high speed, inspect the following:
— Short to GND circuit between PCM terminal 4F and cooling fan relay No.4/cooling fan relay No.1
— cooling fan relay No.1 stuck ON position
8. Turn A/C switch and fan switch are on.
9. Verify that the ACCS PID is ON.
• If the ACCS PID is not ON, inspect for following:
— A/C switch
— Fan switch
— Refrigerant pressure switch
— Open circuit PCM 1AC related harnesses and connectors
10. Access the COLP PID.
11. Verify that the cooling fan is operating high speed an condenser fan is operating low speed, while the COLP
PID is ON.
• If the cooling fan and condenser fan are operating low speed, perform the following:
1. Select FAN1 PID.
2. Operate cooling fan relay No.4 and transfer relay by sending ON command.
3. Inspect the operation sound is heard from cooling fan relay No.4 and cooling fan relay No.1.
— If the operation sound is not heard from cooling fan relay No.4, inspect cooling fan relay No.4 and
open circuit between PCM 4F and cooling fan relay No.4 wiring harnesses and connectors.
— If the operation sound is not heard from cooling fan relay No.1, inspect cooling fan relay No.1 and
between PCM terminal 4F and cooling fan relay No.1 wiring harnesses and connector.
— If the operation sound is heard from cooling fan relay No.4 and cooling fan relay No.1, inspect
wiring harnesses and connectors.
• If the cooling fan motor No.2 does not operate, perform the following:
— Cooling fan motor No.2 and related wiring harnesses and connectors
12. Verify that the cooling fan motor No.1 is operating low speed and the cooling fan motor No.1 is operating high
speed, while the COLP PID is OFF.
• If the cooling fan motor No.1 and cooling fan motor No.2 are operating low seed, perform the following:
1. Select FAN1 PID.
2. Operate cooling fan relay 3 by sending ON command.
3. Inspect the operation sound is heard from cooling fan relay No.3.
— If the operation sound is heard, inspect wiring harnesses and connectors.
— If the operation sound is not heard, inspect coooling fan relay No.3 and open circuit wiring
harnesses and connectors between PCM terminal 4B and coooling fan relay No.3.
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TROUBLESHOOTING