Cimarron V6-173 2.8L (1986)
Radiator Cooling Fan Motor: Testing and Inspection
Wiring Diagram for Chart C-12A - Coolant Fan Control Circuit
CHART C-12A - COOLANT FAN CONTROL CIRCUIT
Circuit Description:
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The cooling fan is totally controlled by the ECM based on inputs from the coolant sensor and fan switch. The fan should run if coolant
temperature is greater than 112~C (234~F).
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Battery voltage is supplied to the fan relay on terminal "E" and ignition voltage to terminal "C".
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Grounding CKT 335 (relay terminal "B") will energize the relay and supply battery voltage to the fan motor.
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The ECM will remove the ground to CKT 335 if vehicle speed is over 40 mph.
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When A/C is used, the fan control switch, mounted in the high pressure line, will open when head pressure exceeds 1600 kPa (233 psi) and this
input causes the ECM to ground CKT 335.
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If a Code 14 or 15 sets, the ECM will turn "ON" the cooling fan.
