Cooling Fan Control Operation Inspection (BP WITH TC)

Connect the WDS or equivalent to DLC-2.
Access the ECT PID.
Verify that the ECT PID is below 100°C {212°F}
Verify that the fan motor No.1 and No.2 do not operate.
- If the cooling fans are operating, inspect for following:
  - Short to GND circuit in wiring between A/C switch and PCM terminal 4F
  - Short to GND circuit in wiring between fan relay No.1 and PCM terminal 2B
  - Short to GND circuit in wiring between fan relay No.2 and PCM terminal 2C
  - Short to GND circuit in wiring between fan relay No.3 and PCM terminal 2C
  - Fan relay No.1 stuck close
Start the engine and warm up it to ECT PID is above 100°C {212°F}
Verify that fan motor No.1 and No.2 operate.
- If the fan motor No.1 and No.2 do not operate inspect for following:
  - Open circuit in wiring between PCM terminal 2B and fan relay No.1
  - Open circuit in wiring between battery positive terminal and fan relay No.1
  - Fan relay No.1 stuck open
- If the fan motor No.1 does not operate inspect for following:
  - Open circuit between fan relay No.1 and GND through fan motor No.1
  - Fan motor No.1 malfunction
- If the fan motor No.2 does not operate inspect for following:
  - Open circuit between fan relay No.3 and GND through fan motor No.2
  - Fan motor No.2 malfunction
Verify that the fan motor No.1 and No.2 operate high speed while the A/C is operating.
- If the fan motor No.1 and No.2 do not operate high speed, inspect for following:
  - Open circuit between A/C switch and PCM terminal 4F
  - Open circuit between PCM terminal 2C and fan relay No.2
  - Open circuit between PCM terminal 2C and fan relay No.3
  - Open circuit between battery positive terminal and fan relay No.2
  - Open circuit between battery positive terminal and fan relay No.3
  - Open circuit between fan relay No.2 and GND
  - Fan relay No.2 stuck open
  - Fan relay No.3 stuck open
- If the fan motor No.1 does not operate high speed, inspect for following:
  - Open circuit between fan relay No.2 and fan motor No.1
  - Open circuit between fan relay No.3 and fan motor No.1
  - Fan motor No.1 malfunction
- If the fan motor No.2 does not operate high speed, inspect for following:
  - Open circuit between fan relay No.2 and fan motor No.2
  - Open circuit between fan relay No.3 and fan motor No.2
  - Fan motor No.2 malfunction