GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Saturn 🢒 2004 🢒 L300/LW300 🢒 Engine 🢒 Engine Cooling 🢒 Cooling Fan Always On

Step

Action

Yes

No

Schematic Reference : Engine Cooling Schematics , HVAC Schematics in HVAC Systems - Automatic or HVAC Schematics in HVAC Systems - Manual

Connector End View Reference: Cooling System Connector End Views

DEFINITION: One or both engine cooling fan motors run continuously in high or low speed.

1

Did you perform the Engine Cooling Diagnostic System Check?

Go to Step 2

Go to Diagnostic System Check - Engine Cooling

2
  1. Turn OFF the ignition.
  2. Disconnect the cooling fan control module.
  3. Disconnect the PCM/ECM.
  4. Turn ON the ignition, with the engine OFF.

Test the control circuits of the cooling fan control module for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 8

Go to Step 3

3
  1. Turn Off the ignition.
  2. Connect the PCM/ECM.
  3. Turn ON the ignition, with the engine OFF.
  4. Probe the control circuits of the cooling fan control module with a test lamp that is connected to voltage.

Does the test lamp illuminate on any control circuit?

Go to Step 5

Go to Step 4

4

Inspect for poor connections at the cooling fan control module. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 8

Go to Step 6

5

Inspect for poor connections at the harness connector of the PCM/ECM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 8

Go to Step 7

6

Replace the cooling fan control module. Refer to Cooling Fan Control Module Replacement .

Did you complete the replacement?

Go to Step 8

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7

Important: Perform the programming procedure for the PCM/ECM.

Replace the ECM/PCM. Refer to the appropriate procedure:

    •  Engine Control Module Replacement in Engine Controls-3.0L
    •  Powertrain Control Module Replacement in Engine Controls-2.2L

Did you complete the replacement?

Go to Step 8

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8
  1. Use the scan tool in order to clear the DTCs.
  2. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text.

Does the DTC reset?

Go to Step 2

System OK