• | 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 cooling fan relay sends a pulse width modulation (PWM) signal of 12-14 volts to the cooling fan by the cooling fan clutch supply voltage circuit. The engine control module (ECM) uses the PWM signal, which controls the speed of the cooling fan clutch by controlling the position of the oil control valve inside the clutch. If the cooling fan clutch RPM is too high when the control module is commanding 0 percent, DTC P0495 will set.
The engine is running.
Cooling fan RPM exceeds 1,700 RPM for 90 seconds.
DTC P0495 is a Type C DTC.
DTC P0495 is a Type C DTC.
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Control Module References for scan tool information
Engine OFF, verify the fan clutch is not binding by turning the fan by hand.
⇒ | If disengaged, test or replace the relay. |
⇒ | If not disengaged, test the cooling fan clutch supply voltage circuit for a short to voltage. If the circuit tests normal, replace the clutch. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
• | Control Module References for ECM replacement, setup, and programming |