Operation and maintenance manual

Troubleshooting Symptoms Charts QSB4.5 and QSB6.7
Page TS-22 Section TS - Troubleshooting Symptoms
Engine Difficult to Start or Will Not Start (No 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
Fuel grade is not correct for the application or the
fuel quality is poor
.............
Operate the engine from a tank of high-quality fuel.
Refer to Fuel Recommendations and
Specifications in Section V.
OK
Go To Next Step
STEP 4
Electronic fault codes are active
.............
For instructions on how to read active fault codes,
refer to Section 1. If fault codes are active, contact
a Cummins Authorized Repair Facility.
OK
Go To Next Step
STEP 5
OEM engine protection system is malfunctioning
.............
Isolate the OEM engine protection system. Follow
the OEM service manuals to check for a
malfunction.
OK
Go To Next Step
STEP 6
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 7
Keyswitch circuit is malfunctioning
.............
Check the vehicle, equipment, or vessel keyswitch
circuit. Refer to an Authorized Cummins Repair
Facility.
OK
Go To Next Step
STEP 8
Battery voltage supply to the electronic control
module (ECM) is low, interrupted, or open
.............
Check the battery connections. Refer to the OEM
service manual.
OK
Go To Next Step
STEP 9
Moisture in the wiring harness connectors
.............
Dry the connectors with Cummins electronic
cleaner, Part Number 3824510.
OK
Go To Next Step