CM870 and ISX Engines – FAULT CODE 1228


EGR Valve Position Sensor Circuit

Fault Code: 1228
PID: P27
SPN: 27
FMI: 2/2
LAMP: Amber

EGR valve position sensor circuit – data erratic, intermittent, or incorrect.

Possible low power. EGR valve will be closed.

EGR Valve Position Sensor Circuit

Circuit Description

The EGR valve position sensor outputs a voltage signal to the ECM. The ECM converts this signal into a percentage value, 0 to 100 percent, indicating EGR valve position. A fully open valve is equivalent to 100 percent.

Component Location

The EGR valve position sensor is located on the EGR valve assembly. Refer to Procedure 100-002 for a detailed component location view.

Shop Talk

This fault code is caused by an internal failure of the EGR valve position sensor. This failure causes erratic readings of EGR valve position.

NOTE: Prior to running the INSITE™ electronic service tool EGR Valve and EGR Valve/Turbocharger Operational Test, the ECM Calibration Software Phase could possibly need to be updated to the latest Software Phase. The ECM Calibration Phase Software can be checked in INSITE™ electronic service tool, under ‘Features and Parameters’. Expand the selection for ‘System ID and Dataplate’ and go to ‘Calibration Information’. If the Software Phase is earlier than shown below, recalibrate the ECM using the January 2006 INCAL™ CD-ROM, or later. Engines with the Software Phase listed below or later do not require a recalibration.

ISX engines with CM870 (engines built after January 2004) require Software Phase 06050302.

ISX engines with CM870 (engines built before January 2004) require no changes at this time.

This is a warrantable calibration change.

Refer to Troubleshooting Fault Code t05-1228

Last Modified:  02-Sep-2010