Operation CHARM: Car repair manuals for everyone.
Home >> Mazda >> 2000 >> MPV ES V6-2.5L DOHC >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Testing and Inspection >> Component Tests and General Diagnostics >> Cooling Fan Control Inspection >> With A/C

With A/C

1. Start the engine.
2. Turn the A/C switch off.
3. Verify that the A/C compressor magnetic clutch does not actuate.
- If it actuates, go to symptom troubleshooting "No.24 A/C always on or A/C compressor runs continuously".

4. Turn the A/C switch and the fan switch on.
5. Verify that the A/C compressor magnetic clutch actuates.
- If it does not actuate, go to symptom troubleshooting "No.23 A/C does not work sufficiently".

6. Stop the engine.




7. Connect the SSTs (NGS tester) to the DLC-2.
8. Turn ignition key to ON (Engine OFF).
9. Select the PID/DATA MONITOR AND RECORD function on the NGS display.
10. Select A/C SW, A/CP SW and ECT PIDs.
11. Start the engine and monitor all PIDs.




12. Inspect the cooling fan motor and the condenser fan motor operation under condition of the following.

- If the cooling fan motor No.1 or No.2 operates under ECT below 100 °C (212 °F) and A/C switch off condition, inspect the following:
- Short to GND between cooling fan relay No.1 or No.6 and PCM terminal 45
- Short to GND between cooling fan relay No.2, No.3, No.5 or No.7 and PCM terminal 17
- Short to GND between cooling fan relay No.4 and PCM terminal 12
- Cooling fan relay is stuck close
- Short to power circuit between cooling fan relay No.4 and cooling fan motor No.2
- Short to power circuit between cooling fan relay No.1 or No.2 and cooling fan motor No.1

- If the cooling fan motor No.1 does not operate at all, inspect the following:
- Cooling fan motor No.1 malfunction

- If the cooling fan motor No.1 operates at low speed, but does not operate at high speed, inspect the following:
- Open battery power circuit for cooling fan relay No.2 or No.3
- Cooling fan relay No.2 or No.3 is stuck open
- Cooling fan motor No.1 malfunction
- Open circuit between cooling fan relay No.2 and cooling fan motor No.1
- Open circuit between cooling fan motor No.1 and cooling fan relay No.3
- Cooling fan relay No.3 GND open
- Open circuit between cooling fan relay No.2 or No.3 and PCM terminal 17

- If the cooling fan motor No.1 operates at high speed, but does not operate at low speed, inspect the following:
- Open battery power circuit for cooling fan relay No.4
- Cooling fan relay No.4 is stuck open
- Open circuit between cooling fan relay No.4 and PCM terminal 12
- Open circuit between cooling fan relay No.4 and cooling fan motor No.2
- Cooling fan motor No.2 malfunction
- Open circuit between cooling fan motor No.2 and cooling fan relay No.1
- Cooling fan relay No.1 is stuck open
- Open circuit between cooling fan relay No.1 and cooling fan motor No.1
- Cooling fan motor No.1 malfunction
- Cooling fan motor No.1 GND open

- If the cooling fan motor No.2 does not operate at all, inspect the following:
- Cooling fan motor No.2 malfunction

- If the cooling fan motor No.2 operates at low speed, but it does not operate at high speed, inspect the following:
- Open battery power circuit for cooling fan relay No.5 or No.7
- Cooling fan relay No.5 or No.6 is stuck open
- Open circuit between cooling fan relay No.5 and cooling fan motor No.2
- Cooling fan motor No.2 malfunction
- Open circuit between cooling fan motor No.2 and cooling fan relay No.7
- Cooling fan relay No.7 GND open
- Open circuit between cooling fan relay No.5 or No.7 and PCM terminal 17



pro multis · About Operation CHARM