Electronic Control System Signature, ISX and QSX15 Engines – Fault Code Warning Lamps Do Not Illuminate

Idle shutdown or PTO shutdown features are activated

Turn the keyswitch to the OFF position for 30 seconds. Turn the keyswitch to the ON position and check fault code operation.

Fault code warning lamps are burned out

Check the warning lamps for voltage. Replace the bulbs if necessary. Refer to Procedure 019-046.

Fault code warning lamp circuit is malfunctioning

Check the fault code warning lamp circuit. Refer to Procedure 019-047.

Battery voltage supply to the electronic control module (ECM) has been lost

Check the battery connections. Check the fuses and the unswitched battery supply circuit. Refer to Procedure 019-087.