PACCAR PX-9 CM2350 (2013-17) Fault Code:147 PID:91 SPN:91 FMI:1 Accelerator Pedal or Lever Position 1 Sensor Circuit Frequency – Data Valid But Below Normal Operating Range – Most Severe Level
Reason:
Accelerator Pedal or Lever Position 1 Sensor Circuit Frequency – Data Valid But Below Normal Operating Range – Most Severe Level. A frequency of less than 100 HZ has been detected at the frequency throttle input to the ECM.
Effect:
Engine will only idle.
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 accelerator pedal or lever position and idle validation switch did not match.
Action Taken When the Fault Code is Active:
1) The ECM illuminates the red STOP ENGINE lamp immediately after the diagnostic runs and fails.
2) The engine will only idle.
Conditions for Clearing the Fault Code:
1) To validate the repair, start the engine and let it idle for 1 minute.
2) The ECM will turn off the red STOP ENGINE lamp immediately after the diagnostic runs and passes.
3) The fault code status displayed by INSITE™ electronic service tool will change to INACTIVE immediately after the diagnostic runs and passes.
4) The Reset All Faults command in INSITE™ electronic service tool can be used to clear active and inactive faults.
Shop Talk:
N/A
Possible Causes:
1) Open circuit in the frequency throttle signal wire.
2) Shorted to ground frequency throttle signal wire.
3) Malfunctioning frequency throttle.
4) Incorrect frequency throttle reference (input) voltage
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