ISBe/ISB Series Engines – Engine Difficult to Start or Will Not Start (Exhaust Smoke)

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.

Fuel level is low in the tank

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

Battery voltage is low

Inspect the batteries and the unswitched battery supply circuit. Refer to the OEM service manual.

Engine cranking speed is too slow

If the cranking speed is slower than 150 rpm, refer to the Engine Will Not Crank or Cranks Slowlysymptom tree.

Starting aid is necessary for cold weather, or starting aid is malfunctioning

Check for the correct operation of the starting aid. Refer to the manufacturer’s instructions. Refer to the Engine Will Not Crank or Cranks Slowlysymptom tree
Section 1
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Engine block heater is malfunctioning (if equipped)

Check the electrical sources and wiring to the cylinder block heater. Replace the block heater, if necessary. Refer to an Authorized Cummins Repair Facility.

Fuel heater is malfunctioning (if equipped)

Check the fuel heater and replace, if necessary. Refer to the OEM service manual.

Fuel leak

Check the fuel lines, fuel connections, and fuel filters for leaks. Check the fuel lines to the supply tanks. 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.

Fuel grade is notcorrect for the application, or the fuel quality is poor

Operate the engine from a tank of high-quality fuel. Refer to Section V.

Air intake system restriction is above specification

Check the air intake system for restriction. Clean or replace the air filter and inlet piping as necessary. Refer to Section 4.

Vehicle parasitics are excessive

Check the vehicle brakes for dragging, transmission malfunction, cooling fan operation cycle time, and engine-driven units. Refer to the OEM service manual.