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Mechanical Gas Fuel System G5.9, G8.3 – FAULT CODE 478

Battery 2 Voltage High – Voltage Valid but Above Normal Operating Range – Moderately Severe Level


Overview

Battery 2 Voltage High – Voltage Valid but Above Normal Operating Range – Moderately Severe Level

CODE REASON EFFECT
Fault Code: 478
PID: P044
SPN: 1376
FMI: 0/16
LAMP: Warning
SRT: 

Battery 2 Voltage High – Voltage Valid but Above Normal Operating Range
– Moderately Severe Level.

ECM damage will occur.
Isolated Battery Supply Circuit
SMALL | MEDIUM | LARGE

Circuit Description

The 12-VDC isolated battery circuit provides operating power to the ECM. This supply is used by the ECM to provide power to the sensors and actuators connected to it.

Component Location

The location of the DC power supply will vary with the OEM.

Shop Talk

Improper wiring of the battery circuit is the most likely cause of this fault.

Refer to Troubleshooting Fault Code t05-478

Last Modified:  15-Jul-2010
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