SPN 1388 - FMI 4 (Fault Code 298)
Saturday, July 14, 2018
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SPN1388 FMI4
Auxiliary Pressure Sensor Input 2 Circuit - Voltage Below Normal or Shorted to Low Source
CODES:
Fault Code: 298
PID(P), SID(S): P443
SPN: 1388
FMI: 4/4
Lamp: Amber
SRT:
REASON: Low signal voltage or open circuit detected at the OEM pressure circuit.
EFFECT: Possible reduced engine performance.
Circuit Description:
The sensor signal is used by the Engine Control Module (ECM) to monitor the OEM temperature for the engine protection system.
Component Location:
The OEM pressure sensor input and location will vary. Refer to the OEM service manual for sensor location.
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 Control Module (ECM) detected the OEM pressure signal circuit was out of range low.
Action Taken When the Fault Code is Active:
• The ECM illuminates the amber CHECK ENGINE lamp immediately when the diagnostic runs and fails.
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:
Possible causes of this fault code include:
• Signal circuit open or shorted to ground in the engine harness or sensor
• Supply wire open or shorted to ground.
Read More:
SPN 251 - FMI 2 (Fault Code 319)
SPN 1267 - FMI 3 (Fault Code 338)
Blog.Teknisi
Auxiliary Pressure Sensor Input 2 Circuit - Voltage Below Normal or Shorted to Low Source
 |
| OEM Pressure Sensor Circuit |
CODES:
Fault Code: 298
PID(P), SID(S): P443
SPN: 1388
FMI: 4/4
Lamp: Amber
SRT:
REASON: Low signal voltage or open circuit detected at the OEM pressure circuit.
EFFECT: Possible reduced engine performance.
Circuit Description:
The sensor signal is used by the Engine Control Module (ECM) to monitor the OEM temperature for the engine protection system.
Component Location:
The OEM pressure sensor input and location will vary. Refer to the OEM service manual for sensor location.
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 Control Module (ECM) detected the OEM pressure signal circuit was out of range low.
Action Taken When the Fault Code is Active:
• The ECM illuminates the amber CHECK ENGINE lamp immediately when the diagnostic runs and fails.
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:
Possible causes of this fault code include:
• Signal circuit open or shorted to ground in the engine harness or sensor
• Supply wire open or shorted to ground.
Read More:
SPN 251 - FMI 2 (Fault Code 319)
SPN 1267 - FMI 3 (Fault Code 338)
Blog.Teknisi
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