 |
|
Injector Power Supply – Bad Intelligent Device or Component
|
Overview
| CODE | REASON | EFFECT |
| Fault Code: 351 PID: S251 SPN: 627 FMI: 12/12 LAMP: Amber SRT: |
Injector Power Supply – Bad Intelligent Device or Component. The ECM measured injector boost voltage is low. |
Possible low power, engine misfire, and/or engine will not start. |
 ISM – Injector Power Supply Circuit
|
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.
Conditions for Running the Diagnostics
This diagnostic runs continuously when the engine speed is greater than 500 rpm.
Conditions for Setting the Fault Codes
The ECM detects that the measured injector power supply voltage is lower than the commanded injector power supply voltage.
Action Taken When the Fault Code is Active
- The ECM illuminates the amber CHECK ENGINE light immediately when the diagnostic runs and fails.
Conditions for Clearing the Fault Code
The ECM will turn off the amber CHECK ENGINE light immediately after the keyswitch is cycled.
Shop Talk
Verify the electronic control module (ECM) calibration is correct. Check the calibration revision history found on QuickServe™ Online for applicable fixes to the calibration stored in the ECM. If necessary, calibrate the ECM. Use the following procedure in the corresponding Troubleshooting and Repair Manual for the engine being serviced. Refer to Procedure 019-032 in Section 19.
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.
Refer to Troubleshooting Fault Code t05-351
;){kind=link}
;){kind=link}