EGR Valve Position Circuit – Voltage Below Normal or Shorted to Low Source
|Fault Code: 2272
EGR Valve Position Circuit – Voltage Below Normal or Shorted to Low Source. Low signal voltage has been detected at the EGR valve position sensor circuit.
EGR valve actuation will be disabled.
ISB, ISC, and ISL with CM2150 – EGR Valve Position Circuit
The exhaust gas recirculation (EGR) valve is opened by a motor located on top of the EGR valve. A motor shaft extends from the motor and contacts the dual-poppet valve to open the EGR valve. The EGR valve motor does not actually retract the EGR valve. The motor current is reduced and the spring pushes the EGR valve closed.
The EGR valve motor contains three position sensors that detect the location of the EGR valve. These sensors report the position of the valve back to the ECM over the EGR valve position A, B, and C wires.
The EGR valve is located on the air intake connection. Refer to Procedure 100-002 in Section E for a detailed component location view.
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 ECM detects that all position sensors are reading high or all position sensors are reading low.
Action Taken When the Fault Code is Active
- The ECM illuminates the amber CHECK ENGINE light immediately when the diagnostic runs and fails.
- The EGR valve operation will be disabled.
Conditions for Clearing the Fault Code
The ECM will turn off the amber CHECK ENGINE light immediately after the diagnostic runs and passes.
Verify the electronic control module (ECM) calibration is correct. Check the calibration revision history found on QuickServe® Online for applicable fixes to the calibration stored in the ECM. If necessary, calibrate the ECM. Use the corresponding Troubleshooting and Repair Manual for the engine being serviced. Refer to Procedure 019-032 in Section 19.
Possible causes of this fault code include:
- EGR valve position sensor wiring shorted to ground, open circuit, or shorted to power supply
- Loss of the EGR valve position sensor supply voltage or the ground circuit.
- Fuel Injector wiring harness shorted to ground, open circuit, or shorted to power supply.