CM870 and ISX Engines – FAULT CODE 386

Sensor Supply Voltage Number 1 Circuit


Overview

CODE REASON EFFECT
Fault Code: 386
PID: S232
SPN: 1079
FMI: 3/3
LAMP: Amber
SRT: 

Sensor Supply Voltage Number 1 Circuit – shorted high. High voltage detected at sensor supply Number 1 circuit.

Engine will run derated.

Sensor Supply Voltage Number 1 Circuit
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Circuit Description

The sensor supply voltage Number 1 of the ECM provides (+) 5 VDC for the barometric pressure sensor and engine oil pressure sensor on the engine harness. This +5 volt supply also powers two optional OEM devices. The two devices are digital vehicle speed sensor and remote accelerator sensor.

Component Location

The sensor supply Number 1 is located in the ECM. The supply voltage is spliced off in the engine and OEM harness to each sensor it supports.

Shop Talk

High voltage on the sensor supply line can be caused by an individual sensor supply wire in the harness shorted to battery voltage or a failed ECM power supply.

Refer to Troubleshooting Fault Code t05-386

Last Modified:  01-Sep-2010