Electronic Control System Signature, ISX and QSX15 Engines – FAULT CODE 758

Fuel Injector


Overview

CODE REASON EFFECT
Fault Code: 758
PID: P129
SPN: 1349
FMI: 7/7
LAMP: Yellow
SRT: 

Incorrect fueling was detected on the rear three cylinders.

Engine will misfire.

Fuel Injector
SMALL | MEDIUM | LARGE

Circuit Description

The electronic control module (ECM) supplies voltage to open the fueling actuators for a short length of time. This allows a short pulse of fuel to flow to the injector. The injector then injects this fuel into the cylinder for combustion.

Component Location

The injectors are located in the cylinder head under the valve cover.

Shop Talk

The ECM measures the amount of fuel metered into each injector by using the rear fuel rail pressure sensor. If the ECM detects that no fuel is entering an injector, the fault code is activated.

Refer to Troubleshooting Fault Code t05-758.

Last Modified:  26-Oct-2010