PACCAR PX-9 CM2350 (2013-17) Fault Code:2571 PID: SPN:2630 FMI:3 Engine Charge Air Cooler Outlet Temperature – Voltage Above Normal or Shorted to High Source

Reason:
Engine Charge Air Cooler Outlet Temperature – Voltage above normal, or shorted to high source

Effect:
None on performance

Circuit Description:
The electronic control module (ECM) uses the charge air cooler temperature sensor to measure the charge air cooler outlet temperature. The charge air cooler temperature sensor contains a variable resistor sensor and is used to measure the temperature of the air exiting the charge air cooler. The ECM supplies 5 volts to the charge air cooler temperature sensor signal circuit. The ECM monitors the change in voltage caused by changes in the resistance of the sensor to determine the temperature of the air entering the charge air cooler.

Component Location:
The charge air cooler temperature sensor is located on the charge air cooler housing .

Conditions for Running the Diagnostics:
This diagnostic runs continuously when the keyswitch is in the ON position or when the engine is running.

Conditions for Setting the Fault Codes:
The Engine Control Module (ECM) detected the compressor intake temperature signal voltage was out of range high.

Action Taken When the Fault Code is Active:
The ECM illuminates the amber CHECK ENGINE lamp immediately when the diagnostic runs and fails.

Conditions for Clearing the Fault Code:
1) To validate the repair, start the engine and let it idle for 1 minute.
2) The ECM will turn off the amber CHECK ENGINE lamp immediately after the diagnostic runs and passes.
3) The fault code status displayed by INSITE™ electronic service tool will change to INACTIVE immediately after the diagnostic runs and passes.
4) The Reset All Faults command in INSITE™ electronic service tool can be used to clear active and inactive faults.

Shop Talk:
N/A

Possible Causes:
1) Open circuit in the harness
2) Open return circuit in the harness, connectors, or sensor