Electronic Control System Signature, ISX and QSX15 Engines – FAULT CODE 284

Sensor Supply Voltage


Fault Code: 284
PID: P221
SPN: 1043
FMI: 4/4
LAMP: Yellow

Incorrect voltage detected on the electronic control module (ECM) voltage supply wire to the crankshaft engine position sensor.

Engine can possibly not run or will run derated. Possible hard starting, low power, or white smoke.

Sensor Supply Circuit

Circuit Description

The ECM supplies the crankshaft engine position sensor with (+) 5 VDC. If the supply wire to any sensor is damaged, the sensor will not
work correctly.

Component Location

The crankshaft engine position sensor is located in the front cover on the intake side of the engine.

Shop Talk

Incorrect voltage on the sensor (+) 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 sensor, or a failed ECM power supply.

Refer to Troubleshooting Fault Code t05-284.

Last Modified:  26-Oct-2010