Electronic Control System Signature, ISX and QSX15 Engines – FAULT CODE 227

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Overview

Sensor Supply Voltage Circuit SMALL | MEDIUM | LARGE

Circuit Description

The ECM supplies each of these sensors with (+) 5 VDC. If the supply wire to any sensor is damaged, the sensor will not work correctly.

In the above picture, the circuits for the wet tank pressure sensor/air compressor and Top 2 Gear Position wires are labeled differently on the industrial wiring diagram. The equivalent differences in the industrial labels are as follows:

Wet Tank Pressure Sensor + 5-VDC Supply
= OEM Pressure Supply (pins 1 to 18)

Wet Tank Pressure Signal
= OEM Pressure Signal (pins 3 to 19)

Wet Tank Pressure Return
= OEM Pressure Return (pins 2 to 20)

Air Compressor Actuator =
Switched Output A (pins 5 to 14)

Air Compressor Return = Spare
(pins 6 to 11)

Top 2 Gear Position + 5-VDC Supply = Spare (pins 14 to 19)

Top 2 Gear Position Input = Spare (pins 15 to 18)

Top 2 Gear Position Return = Spare (pins 16 to 17)

Component Location

1. Front rail pressure sensor is located on the fuel delivery housing.

2. Rear rail pressure sensor is located on the fuel delivery housing.

3. Fuel inlet restriction sensor is located on the fuel delivery housing.

4. Oil pressure/temperature sensor is located below the air compressor (automotive only).

5. Wet tank pressure sensor is located on the air compressor (automotive only).

6. Coolant level sensor. Use the OEM troubleshooting and repair manual for proper location.

7. Top 2 transmission position sensor – located on the transmission if vehicle has a Spicer™ Top 2 transmission. Use the OEM troubleshooting and repair manual for proper location (automotive only).

Shop Talk

High voltage on the sensor (+) 5 VDC supply line will be caused by a short circuit to battery in the supply wire or a short circuit between an actuator wire and the supply wire.

Refer to Troubleshooting Fault Code t05-227.