Radiator Cooling Fan Control Module: Testing and Inspection

INSPECTION USING AN OSCILLOSCOPE (REFERENCE)




Cooling fan control signals
PCM terminals
- 1W(+) - 1AA(-)

Oscilloscope setting
- 5 V/DIV (Y), 1 ms/DIV (X), DC range

Vehicle condition
- Idle after warm up (engine speed approx. 700 rpm, A/C ON)