ISBe/ISB Series Engines – Engine Difficult to Start or Will Not Start (No Exhaust Smoke)

Fuel level is low in the tank

Fill the supply tank. Refer to the OEM service manual.

Electronic fault codes are active

For instructions on how to read active fault codes, refer to Diagnostic Fault Codes in Section 1. If fault codes are active, contact a Cummins Authorized Repair Facility.

Battery voltage is low

Check the batteries and the unswitched battery supply circuit. Refer to Section V.

Battery voltage supply to the electronic control module (ECM) is low, interrupted, or open

Check the battery connections, the fuses, and the unswitched battery supply circuit. Refer to the OEM service manual.

Air in the fuel system

Check for air in the fuel system. Tighten or replace the fuel connections, fuel lines, fuel tank standpipe, and fuel filters as necessary.

Moisture in the wiring harness connectors

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

OEM engine protection system is malfunctioning

Isolate the OEM engine protection system. Follow the OEM service manuals to check for a malfunction.

Electronic control module (ECM) is malfunctioning

Replace the ECM. Refer to an Authorized Cummins Repair Facility.