• PTO controls, if present: – damage – wear – improper operation – lubrication – electrical harness connections and wiring damage • Temperature gauge: – capillary tube damage (if used) – sensor damage • Fluid pressure gauge tubing: – damage – kinks – improper routing b. Throttle Position Sensor (TPS) Adjustment—Using Diagnostic Tool. When properly installed by the equipment manufacturer, the TPS, if used, should not require adjustment. If TPS adjustment is necessary, confirm that it has been installed to Allison Transmission specification (refer to Figure 5–4). The TPS is selfcalibrating and therefore has no optimum closed throttle or full throttle value. Be sure there is no misalignment or obstruction to smooth movement through the full stroke of the TPS. The Allison DOCTM For PC–Service Tool, Windowsbased interface/software diagnostic tool can be used to verify the TPS adjustment (0 percent at closed throttle and 100 percent at full throttle). See the users manual that comes with the diagnostic tool for details. Also, be sure to check for diagnostic codes (DTCs) associated with TPS function.
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