Operation and maintenance manual

Troubleshooting Symptoms Charts QSB4.5 and QSB6.7
Page TS-20 Section TS - Troubleshooting Symptoms
Engine Difficult to Start or Will Not Start (Exhaust Smoke)
Cause Correction
STEP 1
Starting procedure is not correct
.............
Verify the correct starting procedure. Refer to
Section 1.
OK
Go To Next Step
STEP 2
Fuel level is low in the tank
.............
Fill the supply tank. Refer to the OEM service
manual.
OK
Go To Next Step
STEP 3
Electronic fault codes are active or high counts of
inactive fault codes
.............
Review instructions for reading active fault codes.
Contact a Cummins® Authorized Repair Location,
if fault codes are active.
OK
Go To Next Step
STEP 4
Starting aid, if necessary for cold weather, is
malfunctioning
.............
Check for correct operation of the cold weather
starting aid. Refer to Cold Weather Starting Aids in
Section 1. Refer to the manufacturer's instructions.
OK
Go To Next Step
STEP 5
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 the OEM service manual.
OK
Go To Next Step
STEP 6
Fuel heater is malfunctioning, if equipped
.............
Check the fuel heater and replace, if necessary.
Refer to the manufacturer's instructions.
OK
Go To Next Step
STEP 7
Battery voltage is low
.............
Check the batteries and the unswitched battery
supply circuit. Refer to the OEM service manual.
OK
Go To Next Step
STEP 8
Keyswitch circuit is malfunctioning
.............
Check the vehicle keyswitch circuit. Refer to the
OEM service manual.
OK
Go To Next Step
STEP 9
Engine cranking speed is too slow
.............
Determine if the cranking speed is slower than 150
rpm. Refer to the Engine Will Not Crank or Cranks
Slowly symptom tree.
OK
Go To Next Step