SPN 91 - FMI 1 (Fault Code 147)
Friday, July 20, 2018
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SPN91 FMI1
Accelerator Pedal or Lever Position 1 Sensor Circuit Frequency - Data Valid But Below Normal Operating Range - Most Severe Level
CODES:
Fault Code: 147
PID(P), SID(S): P91
SPN: 91
FMI: 1/1
Lamp: Red
REASON: A frequency of less than 100 HZ has been detected at the frequency throttle input to the
ECM.
EFFECT: The engine will operate in Limp Home mode.
Circuit Description:
This type of throttle interface is designed to accept a variable frequency signal as the throttle signal. An electronic component generates a square wave logic-level signal in which the frequency of the signal corresponds to a throttle command. The frequency values are established by the calibration in the engine control module (ECM).
Component Location:
Throttle location varies with each OEM. Refer to the OEM service manual.
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 throttle frequency was less than a calibrated value.
Action Taken When the Fault Code is Active:
• The ECM illuminates the red STOP ENGINE lamp immediately after the diagnostic runs and fails.
-The engine will have limp-home throttle control only.
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 red STOP ENGINE lamp immediately after the diagnostic runs and passes.
• It is necessary to use the "Reset All Faults" command in the recommended Cummins® electronic service tool or equivalent to clear this fault.
Shop Talk:
The frequency throttle can be used in conjunction with a voltage throttle or by itself.
Read More:
SPN 91 - FMI 0 (Fault Code 148)
SPN 105 - FMI 3 (Fault Code 153)
Blog.Teknisi
Accelerator Pedal or Lever Position 1 Sensor Circuit Frequency - Data Valid But Below Normal Operating Range - Most Severe Level
 |
| Frequency Throttle Circuit |
CODES:
Fault Code: 147
PID(P), SID(S): P91
SPN: 91
FMI: 1/1
Lamp: Red
REASON: A frequency of less than 100 HZ has been detected at the frequency throttle input to the
ECM.
EFFECT: The engine will operate in Limp Home mode.
Circuit Description:
This type of throttle interface is designed to accept a variable frequency signal as the throttle signal. An electronic component generates a square wave logic-level signal in which the frequency of the signal corresponds to a throttle command. The frequency values are established by the calibration in the engine control module (ECM).
Component Location:
Throttle location varies with each OEM. Refer to the OEM service manual.
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 throttle frequency was less than a calibrated value.
Action Taken When the Fault Code is Active:
• The ECM illuminates the red STOP ENGINE lamp immediately after the diagnostic runs and fails.
-The engine will have limp-home throttle control only.
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 red STOP ENGINE lamp immediately after the diagnostic runs and passes.
• It is necessary to use the "Reset All Faults" command in the recommended Cummins® electronic service tool or equivalent to clear this fault.
Shop Talk:
The frequency throttle can be used in conjunction with a voltage throttle or by itself.
Read More:
SPN 91 - FMI 0 (Fault Code 148)
SPN 105 - FMI 3 (Fault Code 153)
Blog.Teknisi
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