B5.9G, B5.9LPG – Troubleshooting and Repair Manual – Engine Power Output High

Verify the complaint

Test the engine operation while under load. Perform an engine acceleration test. Perform an engine load/install test. Refer to Procedure 014-002. If engine has low or high power, refer to the Engine Power Output is Low or Engine Power Output is High symptom tree.

Electronic fault codes active or high counts of inactive fault codes

Refer to Section TF in the Troubleshooting and Repair Manual, Fuel Systems and Electronics, B5.9G, C8.3G, L10G-III, Bulletin 3666118, for fault code troubleshooting.

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 4021326 or 4021327. If necessary, recalibrate the ECM. Refer to the appropriate electronic service tool manual and Procedure 019-032 in the Troubleshooting and Repair Manual, Fuel Systems and Electronics, B5.9G, C8.3G, L10G-III, Bulletin 3666118.

Oxygen sensor offset parameter is not correct

Verify that the offset parameter on the oxygen sensor tag matches the oxygen sensor offset parameter listed in INSITE™. Refer to the INSITE™ User’s Manual, Bulletin 3885798.

Turbocharger wastegate actuator is malfunctioning (if equipped)

Check the turbocharger wastegate actuator for correct operation. Refer to Procedure 010-050.

Heated oxygen sensor is damaged or has drifted

Use INSITE™ to check for significantly improved engine performance with the system in open-loop operation. Refer to the INSITE™ User’s Manual, Bulletin 3885798.

Fuel pressure is above specification

Check for Fault Code 331. If Fault Code 331 is active or if there are high counts of inactive Fault Code 331, refer to the Troubleshooting and Repair Manual, Fuel Systems and Electronics, B5.9G, C8.3G, L10G-III, Bulletin 3666118.

Exhaust system restriction is not within specification

Check the exhaust system for restrictions. Refer to Procedure 011-009.

Gas mass flow sensor or circuit malfunctioning

Check gas mass flow sensor and circuit. Refer to Procedure 019-101 in the Troubleshooting and Repair Manual, Fuel Systems and Electronics, B5.9G, C8.3G, L10G-III, Bulletin 3666118.

Intake manifold pressure sensor is malfunctioning

Check the intake manifold pressure sensor. Refer to Procedure 019-099 in the Troubleshooting and Repair Manual, Fuel Systems and Electronics, B5.9G, C8.3G, L10G-III, Bulletin 3666118.

Mixer inlet pressure sensor malfunctioning

Check the mixer inlet pressure sensor. Refer to Procedure 019-098 in the Troubleshooting and Repair Manual, Fuel Systems and Electronics, B5.9G, C8.3G, L10G-III, Bulletin 3666118.