GMC DTC P0480 Cooling Fan Instruction Manual

2017 GMC Truck Acadia AWD V6-3.6L
Vehicle > ALL Diagnostic Trouble Codes ( DTC ) > Testing and Inspection > P Code Charts > P0480
ENGINE HEATING AND COOLING
Document ID: 5145392

Diagnostic Instructions

• 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

DTC Descriptor

DTC P0480
Cooling Fan Speed Output Circuit
DTC P0691
Cooling Fan Speed Output Circuit Low Voltage
DTC P0692
Cooling Fan Speed Output Circuit High Voltage

Diagnostic Fault Information

Circuit| Short to Ground| Open/High Resistance| Short to Voltage| Signal Performance
---|---|---|---|---
B+| PO480, P0691*| PO480| —| —
Control| P0691| PO480| P0692| —

• Opens the fuse that supplies voltage to the component.

Circuit/System Description

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

The output is PWM controlled.
Component| Description
---|---
G10 Cooling Fan Motor| An electric DC motor.
The control module receives a PWM signal from the control module K20 and converts it into  nother PWM signal which directly supplies the fan motor.
K20 Engine Control Module| An electric DC motor.
The control module receives a PWM signal from the control module K20 and converts it into another PWM signal which directly supplies the fan motor.

Conditions for Running the DTC

• Ignition = On
• Battery Voltage = Greater than 11 V

Frequency the DTC runs = Continuously — After the running conditions are met
Conditions for Setting the DTC
Control Circuit = Commanded state does not match the actual state — For greater than 5 s
Actions Taken When the DTC Sets
DTCs listed in the DTC Descriptor Category = Type B DTC
Conditions for Clearing the DTC
DTCs listed in the DTC Descriptor Category = Type B DTC
Reference Information
Schematic Reference
Engine Heating/Cooling Schematics
Connector End View Reference
Master Electrical Component List
Electrical Information Reference

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

DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References

Circuit/System Verification

1. Ignition » On / Vehicle » In Service Mode

2. Perform the scan tool control function: Cooling Fan » From 0 to 90% and back to 0%. Verify the component turns On and Off: G10 Cooling Fan Motor.
   ⇒ If the component does not turn On and Off
   Refer to: Circuit/System Testing
   ⇓ If the component turns On and Off

3. Ignition » On / Vehicle » In Service Mode
   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.

4. Perform the scan tool control function: Cooling Fan » 0 to 90%
   Verify a condition does not exist with the component: G10 Cooling Fan Motor — Turns Off Perform the action while monitoring the component:
   Wiggle the harness and connector: G10 Cooling Fan Motor
   Wiggle the harness and connector: K20 Engine Control Module
   ⇒ If a condition exists
   Repair as necessary » Wiring / Terminal(s) / Electrical Connector(s)
   ⇓ If no condition exists
   

5. 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
   Refer to: Circuit/System Testing
   ⇓ If the DTC is not set
   

6. All OK.

Circuit/System Testing

1. Ignition/Vehicle & All vehicle systems » Off

2. Disconnect the electrical connector: G10 Cooling Fan Motor

3. Ignition » On / Vehicle » In Service Mode

4. Verify a test lamp turns On between the test points: B+ circuit terminal 1 & 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 1 & 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. Ignition/Vehicle » Off & Remove » Test lamp
   2. Test for infinite resistance between the test points: B+ circuit terminal 1 & 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

5. Connect a test lamp between the test points: Control circuit terminal 4 & B+

6. Perform the scan tool control function: Cooling Fan » From 0 to 90% and back to 0%.
   Verify the test lamp turns On and Off.
   ⇒ If the test lamp is always Off
   1. Ignition/Vehicle » Off & Remove » Test lamp
   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: Control circuit terminal 4 @ Component harness &Ground
   ⇒ If 1 V or greater » Repair the short to voltage on the circuit.
   ⇓ If less than 1 V
   5. Ignition/Vehicle » Off
   6. Test for less than 2 Ω between the test points: Control 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 the test lamp is always On
   1. Ignition/Vehicle » Off & Remove » Test lamp
   2. Disconnect the appropriate electrical connector: K20 Engine Control Module
   3. Test for infinite resistance between the test points: Control circuit terminal 4 @ Component harness & Ground
   ⇒ If less than infinite resistance » Repair the short to ground on the circuit.
   ⇒ If infinite resistance » Replace the component: K20 Engine Control Module
   ⇓ If the test lamp turns On and Off

7. Test or replace the component: G10 Cooling Fan Motor

Repair Instructions

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

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