SPN 111 - FMI 2 (Fault Code 422)
Tuesday, July 10, 2018
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SPN111 FMI2
Coolant Level - Data Erratic, Intermittent, or Incorrect
CODES:
Fault Code: 422
PID(P), SID(S): P111
SPN: 111
FMI: 2/2
Lamp: Amber
REASON: An error in the coolant level was detected by the ECM.
EFFECT: Possible reduced engine performance.
Circuit Description:
The coolant level sensor is a switch and is used to measure the level of the engine coolant in the radiator top tank. The coolant level sensor is immersed in the coolant and returns a different signal voltage when immersed in coolant versus being out of coolant. The engine control module (ECM) monitors the change in the signal voltage to determine the level of the engine coolant.
Component Location:
The engine coolant level sensor is typically located in the radiator top tank or surge tank. Refer to the OEM service manual for the 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 engine coolant was not reading correctly.
Action Taken When the Fault Code is Active:
• The ECM illuminates the amber CHECK ENGINE lamp and/or the malfunction indicator lamp (MIL) 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 ECM will turn off the amber CHECK ENGINE lamp immediately after the diagnostic runs and passes.
• 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 "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:
• Open circuit in the wiring harness
-Short to ground in the wire harness
-Damaged sensor
Read More:
SPN 97 - FMI 3 (Fault Code 428)
SPN 639 - FMI 2 (Fault Code 426)
Blog.Teknisi
Coolant Level - Data Erratic, Intermittent, or Incorrect
 |
| Engine Coolant Level Circuit |
CODES:
Fault Code: 422
PID(P), SID(S): P111
SPN: 111
FMI: 2/2
Lamp: Amber
REASON: An error in the coolant level was detected by the ECM.
EFFECT: Possible reduced engine performance.
Circuit Description:
The coolant level sensor is a switch and is used to measure the level of the engine coolant in the radiator top tank. The coolant level sensor is immersed in the coolant and returns a different signal voltage when immersed in coolant versus being out of coolant. The engine control module (ECM) monitors the change in the signal voltage to determine the level of the engine coolant.
Component Location:
The engine coolant level sensor is typically located in the radiator top tank or surge tank. Refer to the OEM service manual for the 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 engine coolant was not reading correctly.
Action Taken When the Fault Code is Active:
• The ECM illuminates the amber CHECK ENGINE lamp and/or the malfunction indicator lamp (MIL) 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 ECM will turn off the amber CHECK ENGINE lamp immediately after the diagnostic runs and passes.
• 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 "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:
• Open circuit in the wiring harness
-Short to ground in the wire harness
-Damaged sensor
Read More:
SPN 97 - FMI 3 (Fault Code 428)
SPN 639 - FMI 2 (Fault Code 426)
Blog.Teknisi
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