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Electronic Control System Signature, ISX and QSX15 Engines – FAULT CODE 443

Throttle Voltage Supply


Overview

CODE REASON EFFECT
Fault Code: 443
PID: S221
SPN: 1043
FMI: 4/4
LAMP: Yellow
SRT: 

Low voltage detected on the electronic control module (ECM) voltage supply line to the throttle(s).

Engine will
only idle.
Throttle Voltage Supply Circuit
SMALL | MEDIUM | LARGE

Circuit Description

The ECM supplies the accelerator and the remote throttle with 5 VDC. If the supply line to the accelerators is damaged, the accelerators will
not work correctly.

Component Location

Accelerator pedal is located in the cab.

Use the OEM troubleshooting and repair manual for remote throttle location.

Shop Talk

Low voltage on the 5-VDC supply line will be caused by a short circuit to ground in a supply line, a short circuit between a supply line or a return line, a failed accelerator, or a failed ECM power supply.

Refer to Troubleshooting Fault Code t05-443.

Last Modified:  26-Oct-2010
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