Electronic Control System Signature, ISX and QSX15 Engines – FAULT CODE 753

Engine Speed Sensor Circuit


Fault Code: 753
PID: S064
SPN: 723
FMI: 2/2
LAMP: Yellow

Engine position signal from the camshaft and crankshaft engine position sensors do
not match up.

Low power, rough idle, or possible white smoke.

Engine Speed Sensor Circuit

Circuit Description

The engine speed sensor is a solid-state sensor that provides the engine speed signal to the electronic control module (ECM) through the engine harness.

Component Location

The crankshaft engine speed sensor is located on the front cover of the gear housing. This is on the intake side of the vibration damper. The camshaft engine speed sensor is located in the cylinder head above the ECM.

Shop Talk

If the problem occurs
only at a certain engine temperature, be sure to check the engine speed sensor circuit while the engine is at that particular temperature.

Refer to Troubleshooting Fault Code t05-753.

Last Modified:  26-Oct-2010