• Perform the Diagnostic System Check prior to using this diagnostic procedure:Diagnostic System Check - Vehicle
• Review the description of Strategy Based Diagnosis:Strategy Based Diagnosis
• An overview of each diagnostic category can be found here:Diagnostic Procedure Instructions

For an overview of the component/system, refer to:Cooling Fan Description and Operation

• { P30EE, P30EF }DTC U0632 = Not set
• Cooling Fan 1 Command=Greater than 10%
• Ignition=On
• Ignition Voltage=Greater than 11 V
• { U0632 }Power Mode=Run

Frequency the DTC runs=Continuously—After the running conditions are met

Cooling Fan 1 Speed=Commanded state does not match the actual state—For greater than 16 s

Cooling Fan 1 Speed=Less than 110 RPMorLess than a predefined threshold—For greater than 16 s

Cooling Fan 1 Speed=Greater than 3,999 RPMorGreater than a predefined threshold—For greater than 16 s

Serial data message from component:G10 Cooling Fan Motor=Not Received—For greater than 1 s

DTCs listed in the DTC Descriptor category=Type B DTC

DTCs listed in the DTC Descriptor category=Type B DTC

Engine Heating/Cooling Schematics

Master Electrical Component List

• Circuit Testing
• Connector Repairs
• Testing for Intermittent Conditions and Poor Connections
• Wiring Repairs

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Control Module References

Warning: Keep hands, tools, and clothing away from the engine cooling fans to help prevent personal injury. These fans are electric and can turn ON whether or not the engine is running and physical contact may result in bodily injury.

1. Engine » Idling
2. Verify DTC U1345 is not set
• If the DTC is set

  Refer to:Diagnostic Trouble Code (DTC) List - Vehicle

• If the DTC is not set
3. Verify DTC P135C, U0632 is not set
• If any of the DTCs are set

  Refer to: Circuit/System Testing

• If none of the DTCs are set
4. Verify DTC P30EE, P30EF is not set
• If any of the DTCs are set

  Replace the component:G10 Cooling Fan Motor

• If none of the DTCs are set
5. Ignition/Vehicle » Off
6. Verify a condition does not exist with the component:
• Cooling Fan Motor—Abnormal noise/Binding or Sticking/Worn/Visible Damage
• Blade—Cracked/Missing/Visible Damage
• Blade&Engine Coolant Fan Shroud—Blocked by debris/Foreign objects

  For example:

• Ice
• Mud
• Snow
• If a condition exists

  Repair or replace as necessary

• If no condition exists
7. Ignition » On / Vehicle » In Service Mode
8. Perform the scan tool function:Clear the DTCs.
9. Engine » Idling
10. Perform the scan tool control function:Cooling Fan 1»50%—For 2 min

    Verify DTC P0494, P30EE, P30EF is not set

• If DTC P0494 is set

  Refer to: Circuit/System Testing

• If DTC P30EE, P30EF is set and no other DTCs are set

  Replace the component:G10 Cooling Fan Motor

• If none of the DTCs are set
11. Ignition » On / Vehicle » In Service Mode
12. Perform the scan tool control function:Cooling Fan 1»Command the component to the maximum position/speed

    Verify a condition does not exist with the component:Cooling Fan—Turns Off

• Wiggle the harness and connector(s):G10 Cooling Fan Motor
• Wiggle the harness and connector(s):K20 Engine Control Module
• Wiggle the harness and connector(s):X50A Fuse Block - Underhood
• Wiggle the component:Fuse@X50A Fuse Block - Underhood
• If a condition exists

  Repair as necessary » Wiring / Terminal(s) / Electrical Connector(s)

• If no condition exists
13. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

    Verify the DTC does not set.

• If the DTC sets

  Repeat step 1

• If the DTC is not set
14. All OK.

Note: It may take up to 2 min for all vehicle systems to power down before an accurate ground or low reference circuit continuity test can be performed.

1. Ignition/Vehicle & All vehicle systems » Off
2. Disconnect the electrical connector:G10 Cooling Fan Motor
3. Test for less than 5 Ω between the test points:Ground circuit terminal 1@Component harness&Ground
• If 5 Ω or greater
1. Disconnect the ground connection:Ground terminal
2. Test for less than 2 Ω between the test points:Ground circuit terminal 1@Component harness&The other end of the circuit@Ground terminal
• If 2 Ω or greater » Repair the open/high resistance in the circuit.
• If less than 2 Ω » Repair the open/high resistance in the ground connection.
• If less than 5 Ω
4. Ignition » On / Vehicle » In Service Mode
5. Verify a test lamp turns On between the test points:B+ circuit terminal 2@Component harness&Ground
• If the test lamp does not turn On and the circuit fuse is OK
1. Ignition/Vehicle » Off & Remove » Test lamp
2. Test for less than 2 Ω between the test points:B+ circuit terminal 2@Component harness&Output terminal@Fuse
• If 2 Ω or greater » Repair the open/high resistance in the circuit.
• If less than 2 Ω » Verify the fuse is OK and there is voltage at the fuse.
• If the test lamp does not turn On and the circuit fuse is open
1. Remove » Test Lamp
2. Test for infinite resistance between the test points:B+ circuit terminal 2@Component harness&Ground
• If less than infinite resistance » Repair the short to ground on the circuit.
• If infinite resistance » Replace the component:G10 Cooling Fan Motor
• If the test lamp turns On
6. Connect a DMM between the test points:Serial Data circuit terminal 4@Component harness&Ground

   Verify the DMM displays between 3.5 and 12 V&Fluctuates

• If less than 3.5 V and does not fluctuate
1. Ignition/Vehicle » Off
2. Disconnect the appropriate electrical connector:K20 Engine Control Module
3. Test for infinite resistance between the test points:Serial Data circuit terminal 4@Component harness&Ground
• If less than infinite resistance » Repair the short to ground on the circuit.
• If infinite resistance
4. Test for less than 2 Ω between the test points:Serial Data circuit terminal 4@Component harness&The other end of the circuit@Control module harness
• If 2 Ω or greater » Repair the open/high resistance in the circuit.
• If less than 2 Ω » Replace the component:K20 Engine Control Module
• If greater than 12 V and does not fluctuate
1. Ignition/Vehicle » Off
2. Disconnect the appropriate electrical connector:K20 Engine Control Module
3. Ignition » On / Vehicle » In Service Mode
4. Test for less than 1 V between the test points:Serial Data circuit terminal 4@Component harness&Ground
• If 1 V or greater » Repair the short to voltage on the circuit.
• If less than 1 V » Replace the component:K20 Engine Control Module
• If between 3.5 and 12 V and fluctuates
7. Test or replace the component:G10 Cooling Fan Motor

Perform the Diagnostic Repair Verification after completing the repair:Diagnostic Repair Verification

• Engine Coolant Fan Replacement—G10 Cooling Fan Motor
• For control module replacement, programming, and setup refer to:Control Module References