4: Radiator Fan and Condenser Fan Do Not Change Speed or Stop

INSPECTION PROCEDURE 4: Radiator Fan and Condenser Fan do not Change Speed or Stop

Refer to - Radiator Fan and Condenser Fan Drive Circuit

CIRCUIT OPERATION
^ The fan control module is powered from fusible link number 2.
^ The ECM or PCM judges the required revolution speed of radiator fan motor and condenser fan motor using the input signals transmitted from A/C switch, automatic compressor controller, vehicle speed sensor , output shaft speed sensor and engine coolant temperature sensor. The ECM or PCM activates the fan control module to drive the radiator fan motor and condenser fan motor.

TECHNICAL DESCRIPTION
The fan control module has variable control of the radiator fan motor and the condenser fan motor speeds using signals transmitted from the ECM or PCM .

TROUBLESHOOTING HINTS
^ Malfunction of fan control relay
^ Malfunction of fan control module
^ Malfunction of ECM or PCM
^ Damaged wiring harness or connector

DIAGNOSIS
Required Special Tool: MB991223: Harness Set

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