Allison Transmision MT4015EN Mechanics Tips

Online pdf Allison Transmision MT4015EN Mechanic‘s Tips

This manual is a mechanic’s reference for maintaining, removing, or installing 3000 and 4000 Product Family transmissions with Allison 4th Generation Controls. All features of the transmission and the vehicle involved in installation procedures are discussed. The information presented will help the mechanic maintain, remove, or install the transmission in a manner that assures satisfactory operation and long service life. For additional detailed information, refer to the appropriate transmission service manual and electronic controls troubleshooting manual.

Unless specifically indicated otherwise, this manual refers to all Allison 4th Generation Controls for 3000 and 4000 Product Family transmissions, except for the 3700 SP model. The differences between the various transmission models are explained as required.

Throttle Position Sensor (TPS) Adjustment Using Diagnostic Tool.
When properly installed by the equipment manufacturer, the TPS should not require adjustment. Confirm that the throttle sensor has been installed to manufacterers specifications (refer to Figure 5–6) before adjusting the throttle position sensor. The idle position should be approximately 8.9 mm or 0.97 volts or higher, and full throttle position should be approximately 35.7 mm or 3.889 volts or lower. The TPS is self-calibrating, meaning there is no optimum closed position or wide open position. As long as the travel is within 8.5–35.7 mm range the TPS is set properly. A total stroke of 15.2–22.9 mm must be maintained.

Watch the TPS movements as the controls move it through a full stroke. Be sure
the following conditions do not exist:

  1. Misalignment or obstruction to smooth movement through the full stroke.
  2. Idle and full throttle positions are not within an error zone (refer to Figure 5–5).

Error codes occur if the idle position is less than 2.5 mm, or when the full throttle position is more than 40.6 mm. When idle or wide open throttle positions are in the error zones, the TCM will log a code. When a TPS code is logged, the TCM assumes a default throttle setting which will negatively effect shift quality.

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