Cummins ISB CM850 (2003-06) Fault Code: 148 PID: 91 SPN: FMI: 0 Accelerator Pedal or Lever Position Sensor 1 – Data Valid but Above Normal Operational Range – Most Severe Level. A frequency of more than 1500 Hz has been detected at the frequency throttle input to the ECM.
Cummins ISB CM850 (2003-06) Fault Code: 148 PID: 91 SPN: FMI: 0 Accelerator Pedal or Lever Position Sensor 1 – Data Valid but Above Normal Operational Range – Most Severe Level. A frequency of more than 1500 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)Malfunctioning OEM Frequency Throttle
2)Shorted signal wire to voltage source.
Possible repairs:
1)Repair or replace the frequency throttle.
2)Replace the OEM harness.
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Allison Transmission – WTEC 2 MD/HD/B SERIES TRANSMISSIONS
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