Cooling Fan Inoperative (LAU)
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Cooling Fan Inoperative (LAU)
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Circuit/System Description
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The engine control module (ECM) commands the cooling fan ON depending on the engine cooling requirements. The ECM controls the cooling fan speed by commanding the cooling fan control module. The cooling fan control module supplies the power and ground circuits for the cooling fan. The ECM sends a pulse width modulated (PWM) signal voltage to the cooling fan control module. The cooling fan control module interprets the signal and operates the cooling fan at the commanded speed.
Schematic Reference
Engine Cooling Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
Cooling Fan Description and Operation (LF1, LFW, LFX)
Cooling Fan Description and Operation (LAU)
Electrical Information Reference
Scan Tool Reference
Control Module References
for scan tool information
Circuit/System Verification
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1.
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Ignition ON, verify that DTC P0480, P0691, or P0692, is not set.
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3.
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Note
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There is a slight delay before the cooling fan activates and reaches full speed.
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Command the cooling fan ON with a scan tool. Verify that the cooling fan turns ON and operates at a high speed.
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1.
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Ignition OFF, disconnect the harness connector at the K22 cooling fan control module.
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2.
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Verify that a test lamp illuminates between the ground circuit terminal 2 and B+.
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3.
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If the test lamp does not illuminate, test the ground circuit for an open/high resistance.
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4.
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If the cooling fan ground circuit/connections test normal, replace the K22 cooling fan control module.
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Perform the
Diagnostic Repair Verification
after completing the diagnostic procedure.