Allison 3000 & 4000 Gen 5 P0122 Pedal Position Sensor Circuit Low Repair

This instruction show you guide on how to solve fault code P0122 pedal position sensor circuit low voltage for Allison 3000 & 4000 Gen 5.

DIAGNOSTIC RESPONSE:

Use default throttle values. Freezes shift adapts.

 

For more Diesel machine repair,please refer to:

2023 Diesel DTC Solutions V2.9.98+ Diesel Explorer 2.0+Instruction

 

CIRCUIT DESCRIPTION:

The TCM may be calibrated to receive an analog Throttle Position Sensor (TPS) pedal position signal from a TPS. Throttle position information comes from a resistive sensor. The resistive throttle sensor is attached to throttle linkage. This device produces a voltage proportional to throttle position.

 

NOTE: Refer to Throttle Position Sensor (TPS) Adjustment for the TPS adjustment procedure and signal voltage specifications.

 

NOTE: The transmission TPS is not the same accelerator pedal sensor that the driver actuates to accelerate the vehicle. The transmission TPS is not used to fuel, accelerate, or decelerate the engine or vehicle. The transmission TPS is only wired to the transmission TCM and is only used for shift scheduling purposes based on the TPS signal amount (shown as TPS voltage in Data Monitor).

 

The TCM is connected to the TPS by:

1 A 5V reference voltage (W112),

2 TPS signal (W144 ), and

3 Analog ground (W158).

The TCM provides a 5V reference voltage to the TPS. The varying voltage at W144 is interpreted as pedal position and the driver

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