CM850 Electronic Control System – FAULT CODE 351

Injector Power Supply – Bad Intelligent Device or Component


Overview

CODE REASON EFFECT
Fault Code: 351
PID: S254
SPN: 627
FMI: 12
LAMP: Amber
SRT: 

Injector Power Supply – Bad Intelligent Device or Component. The ECM measured injector boost voltage is low.

Possible smoke, low power, engine misfire, and/or engine will not start.

Injector Circuit
SMALL | MEDIUM | LARGE

Circuit Description

Between each injection event, the electronic control module (ECM) attempts to recharge the injector power supply. The injector power supply consists of a bank of capacitors; this power supply is maintained at high voltage. Recharging is accomplished by recovering energy stored in the injector solenoids. For the injector power supply to remain fully charged, there must
be good ECM battery power and ground, a good engine speed sensor, and good injector circuits.

Component Location

The injector power supply is located inside the ECM.

Shop Talk

This fault code will become active when the engine is running, the primary engine speed sensor signal is present, the battery charge is above a minimum threshold, and, at the same time, the measured injector power supply voltage is lower than the commanded injector power supply voltage.

This fault code will become inactive whenever the keyswitch is turned on.

This fault code will become inactive whenever the engine is running and measured injector power supply voltage reaches the commanded injector power supply voltage. These parameters can be monitored using INSITE™
electronic service tool.

Refer to Troubleshooting Fault Code t05-351

Last Modified:  08-Jul-2010