SPN 632 - FMI 3 (Fault Code 255)
Sunday, July 15, 2018
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SPN632 FMI3
Engine Fuel Shutoff Valve Driver Circuit - Voltage Above Normal or Shorted to High Source
CODES:
Fault Code: 255
PID(P), SID(S): S17
SPN: 632
FMI: 3/3
Lamp: Amber
REASON: Open circuit or short to voltage source detected at fuel shutoff valve circuit.
EFFECT: None on performance.
Circuit Description:
The fuel shutoff valve is a device used by the engine control module (ECM) to control the engine fuel supply. When the ECM energizes the engine fuel shutoff valve driver circuit, the engine fuel shutoff valve is opened. Zero voltage to the engine fuel shutoff valve will close the engine fuel shutoff valve.
Component Location:
The fuel shutoff valve is located near the fuel pump.
Conditions for Running the Diagnostics:
This diagnostic runs continuously when the keyswitch is in the ON position or when the engine is running.
Conditions for Setting the Fault Codes:
The engine fuel shutoff valve circuit PWM signal is detected to be at system voltage when the PWM voltage is turned off.
Action Taken When the Fault Code is Active:
• The ECM illuminates the amber CHECK ENGINE lamp immediately when the diagnostic runs and fails.
-The engine fuel shutoff valve will not open. The engine will not start or run
Conditions for Clearing the Fault Code:
• To validate the repair, perform a key cycle, start the engine and let it idle for 1 minute.
• The fault code status displayed by the recommended Cummins® electronic service tool or equivalent will change to INACTIVE immediately after the diagnostic runs and passes.
• The ECM will turn off the amber CHECK ENGINE lamp immediately after the diagnostic runs and passes.
• The "Reset All Faults" command in the recommended Cummins® electronic service tool or equivalent can be used to clear active and inactive faults.
Shop Talk:
If there is an external shutdown system on the vehicle, make sure it is wired correctly and feeding voltage into the fuel shutoff supply circuit.
Possible causes of this fault code include:
-Open circuit in the engine harness, connectors, or shutoff valve.
-Fuel shutoff valve signal wire shorted to a voltage source in the harness.
Read More:
SPN 632 - FMI 7 (Fault Code 259)
SPN 171 - FMI 4 (Fault Code 256)
Blog.Teknisi
Engine Fuel Shutoff Valve Driver Circuit - Voltage Above Normal or Shorted to High Source
 |
| Engine Fuel Shutoff Valve Driver Circuit |
CODES:
Fault Code: 255
PID(P), SID(S): S17
SPN: 632
FMI: 3/3
Lamp: Amber
REASON: Open circuit or short to voltage source detected at fuel shutoff valve circuit.
EFFECT: None on performance.
Circuit Description:
The fuel shutoff valve is a device used by the engine control module (ECM) to control the engine fuel supply. When the ECM energizes the engine fuel shutoff valve driver circuit, the engine fuel shutoff valve is opened. Zero voltage to the engine fuel shutoff valve will close the engine fuel shutoff valve.
Component Location:
The fuel shutoff valve is located near the fuel pump.
Conditions for Running the Diagnostics:
This diagnostic runs continuously when the keyswitch is in the ON position or when the engine is running.
Conditions for Setting the Fault Codes:
The engine fuel shutoff valve circuit PWM signal is detected to be at system voltage when the PWM voltage is turned off.
Action Taken When the Fault Code is Active:
• The ECM illuminates the amber CHECK ENGINE lamp immediately when the diagnostic runs and fails.
-The engine fuel shutoff valve will not open. The engine will not start or run
Conditions for Clearing the Fault Code:
• To validate the repair, perform a key cycle, start the engine and let it idle for 1 minute.
• The fault code status displayed by the recommended Cummins® electronic service tool or equivalent will change to INACTIVE immediately after the diagnostic runs and passes.
• The ECM will turn off the amber CHECK ENGINE lamp immediately after the diagnostic runs and passes.
• The "Reset All Faults" command in the recommended Cummins® electronic service tool or equivalent can be used to clear active and inactive faults.
Shop Talk:
If there is an external shutdown system on the vehicle, make sure it is wired correctly and feeding voltage into the fuel shutoff supply circuit.
Possible causes of this fault code include:
-Open circuit in the engine harness, connectors, or shutoff valve.
-Fuel shutoff valve signal wire shorted to a voltage source in the harness.
Read More:
SPN 632 - FMI 7 (Fault Code 259)
SPN 171 - FMI 4 (Fault Code 256)
Blog.Teknisi
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