Cummins ISL CM850 (2003-06) Fault Code: 147 PID: 91 SPN: FMI: 1 Accelerator Pedal or Lever Position 1 Sensor Circuit Frequency – Data Valid but Below Normal Operational Range – Most Severe Level. A frequency of less than 100 HZ has been detected at the frequency throttle input to the ECM.
Cummins ISL CM850 (2003-06) Fault Code: 147 PID: 91 SPN: FMI: 1 Accelerator Pedal or Lever Position 1 Sensor Circuit Frequency – Data Valid but Below Normal Operational Range – Most Severe Level. A frequency of less than 100 HZ has been detected at the frequency throttle input to the ECM.
The frequency throttle can be used in conjunction with a voltage throttle or by itself.
Possible causes:
1)Open circuit in the frequency throttle signal wire.
2)Shorted to ground frequency throttle signal wire.
3)Failed frequency throttle.
4)Incorrect frequency throttle reference (input) voltage.
Possible repairs:
1)Repair or replace the frequency throttle.
2)Repair or replace the frequency throttle reference (input) circuit.
3)Repair or replace the OEM harness.
4)Replace the ECM.
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Allison Transmission – WTEC 2 MD/HD/B SERIES TRANSMISSIONS
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