Throttle Position Switch (TPS)
- Disconnect TPS connector. Loosen TPS mounting screws. Connect an ohmmeter or 12 volt test light between Ignition (Pink wire) and EGR (Yellow wire) of TPS switch.
- Insert proper "switch-closed" Gauge Block (J-33043-A) between gauge boss on injection pump and wide open stop screw on throttle shaft.NOTE: Always refer to Emission Control Label for correct gauge block size.
- Rotate throttle lever and hold wide open throttle stop screw against gauge block. Rotate TPS until there is continuity between terminals. Hold switch body at this position and tighten mounting bolts to 53 INCH lbs. (6 N.m).
- Release throttle lever and allow it to return to idle position. Remove "switch-closed" gauge block and insert "switch-open" gauge block. Rotate throttle lever against "switch-open" gauge block. There should be no continuity between terminals.
- If no continuity is present, switch is set properly. If continuity is present, then switch must be reset by returning to step 1) and repeating entire procedure. See Fig 1.