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Electronic Control System Signature, ISX and QSX15 Engines – FAULT CODE 148 (INDUSTRIAL)

Frequency Throttle Circuit


Overview

CODE REASON EFFECT
Fault Code: 148
PID: P091
SPN: 91
FMI: 8/8
LAMP: Red
SRT: 

A frequency of more than 100 Hz was detected at the frequency throttle signal pin of the actuator harness connector at the ECM.

Calibration-dependent power and speed derate.
Frequency Throttle Circuit
SMALL | MEDIUM | LARGE

Circuit Description

The frequency throttle provides the driver’s throttle command to the electronic control module (ECM) through the OEM engine harness and the actuator harness. The ECM uses this signal to determine the fueling command.

Component Location

Throttle location varies with each OEM. Use the OEM troubleshooting and repair manual.

Shop Talk

The frequency throttle can be used either in conjunction with a voltage throttle or by itself.

Refer to Troubleshooting Fault Code t05-148.

Last Modified:  26-Oct-2010
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