RING-BACKUP 4I3631 - Caterpillar

System Operation Description:Use this procedure under the following situation:Use this procedure if any of the following diagnostic codes are indicated:
0041-03 8 Volt DC Supply voltage above normal
0041-04 8 Volt DC Supply voltage below normal
0091-08 Throttle Position Sensor abnormal frequency, pulse width, or period Also, use this procedure if the digital throttle position sensor is suspected of incorrect operation.Digital Throttle Position SensorThe digital throttle position sensor is used to provide a digital throttle position signal to the Engine Control Module (ECM). The sensor output is a constant frequency signal with a pulse width that varies with the throttle position. This output signal is referred to as either a duty cycle or a pulse width modulated signal (PWM) and this output signal is expressed as a percentage between 3 and 100 percent.The digital throttle position sensor is most likely to be attached directly to the throttle assembly. The digital throttle position sensor requires no adjustment.The digital throttle position sensor will produce a duty cycle of 10 to 22 percent at low idle and 75 to 90 percent when the throttle pedal is fully depressed. The percent of duty cycle is translated in the ECM into a throttle position of 3 to 100 percent.The digital throttle position sensor is powered by +8 Volts DC from the ECM. The supply voltage is from the J1:43 to terminal "A" of the digital throttle position sensor connector.If the application is using the ECM dedicated PTO functions, the digital throttle position sensor will be ignored while the engine is in PTO mode.The ECM is in PTO mode if the "PTO ON/OFF Switch" is ON. This can be checked with the electronic service tool. Refer to Troubleshooting, "PTO Switch Circuit - Test" for testing if the PTO is being used.
Illustration 1 g01802294
Typical schematic of the digital throttle position sensor
Illustration 2 g01802315
Typical example of the pin locations on connector P1 (33) Sensor return (43) Sensor supply (+8 Volts DC) (53) Sensor inputTest Step 1. Inspect Electrical Connectors and Wiring
Inspect the P1/J1 connector, OEM harness and the connectors on the harness. Thoroughly inspect the digital throttle position sensor connector. Refer to Troubleshooting, "Electrical Connectors - Inspect" for details.
Perform a 45 N (10 lb) pull test on each of the wires in the ECM connector that are associated with the digital throttle position sensor:
P1:33
P1:43
P1:53
Check the screw for the ECM connector for the correct torque of 5.0 N m (44 lb in).
Check the harness for abrasion and pinch points from the digital throttle position sensor to the ECM.Expected Result:All connectors, pins and sockets are completely coupled and/or inserted and the harness is free of corrosion, of abrasion or of pinch points.Results:
OK - Proceed to Test Step 2.
Not OK - Repair: Perform the following repair:Repair the connectors or the harness and/or replace the connectors or the harness. Ensure that all of the seals are correctly in place and ensure that the connectors are completely coupled.Use the electronic service tool in order to clear all logged diagnostic codes and then verify that the repair