Cooling fan control system Inspection
WARNING: This page is about a different car, the 2020 Mazda CX-30. However, it is still accessible from the selected car via links, so may be relevant.
- Connect the M-MDS to the DLC-2.
- Perform the KOEO or KOER self-test using the M-MDS and verify that none of the following DTCs is detected. (See DTC INSPECTION
.)
- P0117:00
- P0118:00
- P0480:00
- P0481:00
- P2184:00
- P2185:00
- If any of the following DTCs can be verified, perform the applicable DTC inspection. (See DTC P0117:00 [PCM (SKYACTIV-G)] .) (See DTC P0118:00 [PCM (SKYACTIV-G)] .) (See DTC P0480:00 [PCM (SKYACTIV-G)] .) (See DTC P0481:00 [PCM (SKYACTIV-G)] .) (See DTC P2184:00 [PCM (SKYACTIV-G)] .) (See DTC P2185:00 [PCM (SKYACTIV-G)] .)
- Verify that the engine coolant temperature is less than 97°C {206°F}, and then start the engine and idle it.
- Verify that the cooling fan does not operate when the A/C switch is turned off.
- If it is operating, perform the following inspections.
Inspection items - Cooling fan relay No. 1 (stuck closed)
- Cooling fan relay No. 2 (stuck closed)
- Wiring harness between cooling fan relay No. 1 and cooling fan motor (short to power supply)
- Wiring harness between cooling fan relay No. 2 and cooling fan motor (short to power supply)
- A/C pressure sensor
- Climate control unit
- CAN communication (PID: AC_REQ constantly ON)
- Verify that the cooling fan operates at a low speed when the L_SPD_FAN is turned from OFF to ON using the M-MDS simulation function.
- If the operation cannot be verified, perform the following inspections.
Cooling fan status Inspection items OFF - Cooling fan relay No. 1 (stuck open)
- Cooling fan motor (internal open circuit)
- Wiring harnesses between battery and cooling fan relay No. 1, and cooling fan relay No. 1 and cooling fan motor (fuse blown due to open circuit and short to ground)
- Wiring harness between cooling fan motor and ground (open circuit and poor ground)
- Verify that the cooling fan operates at a high speed when the H_SPD_FAN is turned from OFF to ON using the M-MDS simulation function.
- If the operation cannot be verified, perform the following inspections.
Cooling fan status Inspection items OFF - Cooling fan relay No. 2 (stuck open)
- Cooling fan motor (internal open circuit)
- Wiring harnesses between battery and cooling fan relay No. 2, and cooling fan relay No. 2 and cooling fan motor (fuse blown due to open circuit and short to ground)
- Wiring harness between cooling fan motor and ground (open circuit and poor ground)