Cummins ISX11.9 CM2250 – Service Manual Engine Speed Surges in PTO or Cruise Control

Electronic fault codes active or high counts of inactive fault codes

Refer to Section TF in the Fault Code Troubleshooting Manual, Bulletin
4022225, for fault code troubleshooting.

Cruise control/PTO on/off switch or circuit is malfunctioning

Check the cruise control/PTO on/off switch and the circuit. Refer to Procedure 019-021 and
Procedure 019-022 in Section 19.

Electronic control module (ECM) calibration is malfunctioning

Verify the ECM calibration is correct. Check the calibration revision history for applicable fixes to the calibration stored in the ECM. Refer to the calibration history spreadsheet Click here to see ecm_calibration_rev_history.xls

on QuickServe™ Online or the INCAL™ CD-ROM. Compare the calibration stored in the ECM with the engine rating and Control Parts List (CPL), Bulletin 4021328. If necessary, calibrate the ECM. Refer to Procedure 019-032 in Section 19
.

Engine position sensor (EPS) or circuit is malfunctioning

Check the camshaft and crankshaft position sensors and circuits. Refer to Procedure 019-363 and
Procedure 019-365 in Section 19.

Engine speed surges while in the normal operating range and not in PTO or cruise control

Refer to the Engine Performance Troubleshooting Tree in Section TT.

Moisture in the wiring harness connectors

Dry the connectors with Cummins® electronic cleaner, Part Number 3824510.

Engine speed also surges at idle

Refer to the Engine Performance Troubleshooting Tree in Section TT.