Century V6-204 3.3L VIN N FI (1990)
Chart C-12(A),(B),(C) Cooling Fan Wiring Diagram
CIRCUIT DESCRIPTION:
Power for the coolant fan motor comes through the fusible link to terminal "A" on the relay. The relay is energized when current flows to ground
through the quad driver module inside the ECM.
Coolant fan Relay - The coolant fan relay is energized by the ECM. The ECM energizes the relay through terminal "YE8" when the coolant temperature
reaches 100°C (212°F). The fan relay is also energized when A/C is requested.
TEST DESCRIPTION:Numbers below refer to circled numbers on the diagnostic chart.
1.
Removing the relay interrupts current flow to the fan motor so the fan should not be "ON."
2.
Test light should be "OFF" as the A/C system should not have high pressure, due to the fact that the A/C is not being requested.
3.
If the test light goes "OFF" when the black C-D connector is disconnected, the QDM is faulty and the ECM has to be replaced.
