Electronic Control System Signature, ISX and QSX15 Engines – FAULT CODE 541

ICON™ Starter Relay/Interlock Circuit


Fault Code: 541
PID: S123
SPN: 615
FMI: 11/31
LAMP: Yellow

Incorrect voltage detected at the ICON™ starter relay/interlock circuit by the electronic control module (ECM).

The ICON™ idle control system will be disabled. Only mandatory shutdown will be enabled. Engine can be started normally.

ICON™ Starter Relay/Interlock Circuit

Circuit Description

The starter relay/interlock circuit controls and monitors both the starter relay coil and the ICON™ interlocks. The starter relay is used by the ICON™ feature to perform automatic starts of the engine. The interlocks are used by the ICON™ feature to monitor if the transmission is in neutral, the position of the hood/cab, and if the parking brakes are set.

Component Location

The location of the starter relay, parking brake switch, neutral position switch, and hood tilt switch vary among OEMs. Consult the specific OEM troubleshooting and repair manual for exact location.

Shop Talk

Typically, this fault code indicates a short circuit to battery, a short circuit to ground, or an open circuit.

Refer to Troubleshooting Fault Code t05-541.

Last Modified:  26-Oct-2010