• | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
• | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
• | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
---|---|---|---|---|
Cooling Fan Relay Ground | -- | P0483 | -- | -- |
Cooling Fan Relay Voltage Supply | P0480, P0483 | P0480, P0483 | -- | -- |
Cooling Fan Relay Control | P0480 | P0480 | -- | -- |
Hall Effect Sensor Low Reference | -- | P0483, P0526 | -- | -- |
Hall Effect Sensor 5-Volt Reference | P0642 | P0526 | P0401, P0643 | -- |
Hall Effect Sensor Cooling Fan Speed Signal | P0526 | P0526 | P0526 | -- |
Cooling Fan Clutch Fluid Solenoid Valve Ground | -- | P0483 | -- | -- |
Cooling Fan Clutch Control | P0483 | P0483 | P0483, P0495 | -- |
The engine control module (ECM) sends a pulse width modulation (PWM) signal of 0-12 volts via the cooling fan clutch control circuit to the cooling fan relay. The ECM monitors the cooling fan clutch control circuit during vehicle operation. When the cooling fan is commanded on by the ECM, the control circuit is at a low voltage. When the cooling fan is commanded off, the control circuit is near battery voltage. The ECM uses this PWM to control the position of the oil control valve located inside the cooling fan clutch.
The ignition is ON.
• | The ECM detects that the commanded state and the actual state of the control circuit do not match. |
• | The above condition is present for at least 600 ms. |
DTC P0480 is a Type C DTC.
DTC P0480 is a Type C DTC.
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Control Module References for scan tool information
⇒ | If more than the specified range, test the ground circuit for an open/high resistance. |
⇒ | If not disengaged, test the cooling fan clutch supply voltage circuit for a short to voltage. If the circuit tests normal, replace the clutch. |
⇒ | If not engaged, test the cooling fan clutch supply voltage circuit for a short to ground or an open/high resistance. If the circuit tests normal, test the fan clutch ground circuit for an open/high resistance. If the circuits test normal, replace the clutch. |
⇒ | If not engaged, test the cooling fan clutch supply voltage circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the clutch. |
⇒ | If not engaged, test the relay voltage supply circuit for a short to ground or an open/high resistance. If the circuit tests normal and its fuse is open, test all connected components and replace as necessary. |
⇒ | If the lamp does not flash or vary correctly, test the cooling fan clutch control circuit for a short to ground, a short to voltage, or an open/high resistance. If the circuit tests normal, replace the ECM. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
• | Control Module References for ECM replacement, setup, and programming |