SENSOR GP-POSITION 2661470 - Caterpillar

System Operation
The rack position sensor is magnetically attached to the fuel rack. The sensor is supplied with 8 volts for operation,and uses 5 volts for sensor reference. The signal output of 0.3 volts to 5.25 volts is read by the ECM as rack position of 0 to 17.5 mm (0 to 0.69in).Schematic
Diagnostic Codes
Functional Test
Calibration
1. Shut the engine Off. Turn key Off.2. Connect the ECAP to the engine data link connector J13.3. Turn the ignition switch to the On position, engine Off. Select "Calibrate/Monitor" from the main menu and then select "Rack Position Sensor Calibration" to monitor "Rack Position".
Rack Solenoid (BTM) (1). Cover (2).4. Remove rack solenoid (BTM) (1) and cover (2).
Shutoff Lever (3).5. Remove shutoff lever (3).
Plugs (4).6. Remove plugs (4) from the governor housing.
(5) 4C9581 Rack Zero Pins.7. Install the 4C9581 rack zero pins (5) in the top of the fuel injection pump housing. Move rack control bar to engage both pins behind the racks.8. Move rack control bar approximately 25 mm (1 in) toward the front of the engine and block in this position.9. With the rack held back against the "zero pins", read the "Rack Position" on the ECAP display. A. If the "Rack Position" reading is 9.50 0.05 mm (0.37 0.002 in) the rack position sensor is calibrated correctly. Stop.B. If the "Rack Position" reading is not 9.50 0.05 mm (0.37 0.002 in) the rack position sensor needs adjust ment as follows:
(6) Rack Position Sensor Locknut.10. Use the 4C9582 Crowfoot Wrench and a 3/8 inch drive ratchet to loosen the locknut (6) on the rack position sensor.11. Make sure the rack position sensor wiring is connected to the engine harness connector wiring.12. With electrical power to the ECM, select the Calibrate/Monitor display that has "Rack Position Sensor Calibration" from the main menu on the ECAP.13. Turn the collar on the rack position sensor in or out as indicated by the ECAP, until the ECAP displays "Calibrated". If the rack position sensor is unable to calibrate go back to Functional Test Step 3.14. Tighten the locknut to 55 7 N m (41 5 lb ft).15. Check the rack position calibration reading on the ECAP to make sure that the rack position sensor is still in calibration after tightening the locknut.16. Turn key Off.17. Install rack solenoid (BTM).18. Install shutoff lever and cover on governor housing. Make sure not to pinch a wire between the cover and housing.19. Remove the 4C9581 rack zero pins and install the plugs in the top of the fuel injection pump housing.20. Disconnect the ECAP from the engine data link connector J13.