Cooling Fan Motor Operation Inspection - Mazda 3 Workshop Manual

Mazda 3 Workshop Manual – Engine + Wiring Diagrams + Diagnostic Trouble Codes
(4) Access ACCS PID.
(5) Turn the A/C relay from off to on and inspect if the operation sound of the relay is heard.
• If the operation sound is heard, inspect TP PID.
• If the operation sound is not heard, inspect following.
- A/C relay
- Open circuit or short to GND in wiring harness and connectors (Ignition switch-A/C relay-PCM
terminal 1AN)
- A/C related parts

Cooling Fan Motor Operation Inspection

1. Verify that the battery voltage is above 12.4 V.
• If the battery voltage is below 12.4 V, charge the battery or connect the external power supply.
2. Connect the WDS or equivalent to the DLC-2.
3. Access the following PIDs.
• ECT
• AC_REQ
• COLP
4. Turn the A/C switch to off.
5. Verify that ECT PID is below 98 °C {209 °F} and the AC_REQ is off.
• If the ECT PID is below 98 °C {209 °F}, inspect the ECT sensor.
• If the AC_REQ PID is on, inspect the A/C switch and A/C refrigerant pressure switch (high/low
pressure).
6. Turn the ignition switch to the ON position while the temperature is below 98 °C {209 °F} with the
ignition switch in the ON position.
7. Verify that the cooling fan is not operating.
• If the cooling fan is operating inspect the following:
(1) Verify that the FAN DUTY PID is 0 %.
• If the FAN DUTY PID is not 0 %, inspect the following PID and related parts.
- ECT (ECT sensor)
- AC_REQ (A/C switch and A/C refrigerant pressure switch (high/low) pressure)
- COLP (A/C refrigerant pressure switch (medium pressure))
- VSS (Vehicle speed sensor)
- ACCS (A/C magnetic clutch)
• If the FAN DUTY PID is 0 %, replace cooling fan component.
Downloaded from https://carmanualshub.com/ - automotive repair manuals website