PLUG 7W1632 - Caterpillar

System Operation Description:The throttle and the inputs of the droop to the ECM are provided by a throttle or by a load share module. The inputs are provided through the wiring of the equipment. These inputs are constant frequency signals with a variable pulse width. The signals are expressed as a percentage between 0 and 100 percent duty cycle.The throttle signal and the input signal of the droop have a duty cycle of 5 percent to 10 percent for low throttle and 90 percent to 95 percent at full throttle. The throttle signal is translated by the ECM into the throttle position between 0 and 100 percent. The signal for the droop is translated into a setting for the droop of 0 to 10 percent.Use this procedure to troubleshoot the electrical system if a problem is suspected with the throttle input or if the diagnostic code in Table 1 is active.
Table 1
Diagnostic Codes Table    
Code and Description    Flash Code    Conditions which Generate this Code    System Response    
91-8 Throttle Position Sensor : Abnormal Frequency, Pulse Width, or Period     32     The Engine's Electronic Control Module (ECM) detects a sensor frequency that is less than 150 Hz or a sensor frequency that is greater than 1000 Hz for two seconds.     The diagnostic code is active and the code is logged. The throttle signal defaults to a zero percent duty cycle.    
91-10 Throttle Position Sensor : Abnormal Rate of Change     32     The Engine's Electronic Control Module (ECM) detects a sensor frequency that is changing at a abnormal rate.     The diagnostic code is active and the code is logged.    
Illustration 1 g01646874
Illustration 2 g01646895
(08) Primary throttle (37) DroopTest Step 1. Inspect the Electrical Connectors and the Wiring Harness
Remove electrical power from the ECM.
Thoroughly inspect the J14/P14 ECM connector. Inspect the J17/P17 customer connector. Refer to Troubleshooting, "Electrical Connectors - Inspect" for details.
Perform a 45 N (10 lb) pull test on each of the wires that are associated with the circuit.
Check the allen head screw on the ECM connector for the proper torque. Refer to Troubleshooting, "Electrical Connectors - Inspect" for the correct torque values.Expected Result:All connectors, pins, and sockets are completely coupled and/or inserted, and the harness and wiring are free of corrosion, of abrasion and of pinch points.Results:
OK - All connectors, pins, and sockets are completely coupled and/or inserted, and the harness and wiring are free of corrosion, of abrasion and of pinch points. Proceed to Test Step 2.
NOT OK - There is a problem with the connectors and/or the wiring.Repair: Repair the wiring and connectors or replace the wiring or the connectors. Ensure that all of the seals are properly connected. Verify that the repair eliminates the problem.STOPTest Step 2. Check Throttle and Droop Readings on Caterpillar Electronic Technician (ET)
Connect to the service tool connector.Note: Disconnect the wires from the output terminals when you troubleshoot a generator with a load share module. Connect a 9X-9591 Electrical Converter Gp with a