ENGINE AR-COMPLETE 4843456 - Caterpillar

Illustration 5 g00762874
Simulated Load for the ECM
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SchematicTest Step 1. Inspect Electrical Connectors and Wiring
Turn the keyswitch to the OFF/RESET position.
Check the connectors and wiring for the following problems: damage, corrosion, abrasion and incorrect attachment. Pay close attention to the following areas:
J1/P1 ECM connector
J3/P3 Customer connector
J35/P35 Throttle Position Sensor (Port)
J35/P35 Throttle Position Sensor (STBD)Refer to Troubleshooting, "Electrical Connectors - Inspect" for more information.Expected Result:The connectors and wiring should be free of the following problems: damage, corrosion, abrasion and incorrect attachment.Results:
OK - Proceed to Test Step 2.
Not OK - Repair: Repair the connectors or wiring and/or replace the connectors or wiring. Ensure that all of the seals are properly in place and ensure that the connectors are completely coupled.Verify that the repair eliminates the problem.Clear all logged diagnostic codes. Stop.Test Step 2. Check the Voltage at the Sensor
Turn the keyswitch to the ON position. The engine should be OFF.
Measure the voltage between P35:A and P35:B (Port).
Measure the voltage between P35:A and P35:B (STBD).Expected Result:The supply voltage should be between 11.0 VDC and 13.5 VDC for a 12 Volt system and the supply voltage should be between 22.0 VDC and 27.0 VDC for a 24 Volt system.Results:
OK - The supply voltage is reaching the sensors. Proceed to Test Step 3.
Not OK - Proceed to Test Step 4.Test Step 3. Check the Throttle Position Sensor Duty Cycle at the Sensor
Turn the keyswitch to the OFF position.
Remove the signal wire from Pin C of the throttle position sensor.
Set the digital multimeter to the VDC.
Press the Hz button twice in order to activate the display that will show the symbol for percent.
Place the positive probe of the multimeter on Pin C of the throttle position sensor.
Place the negative probe of the multimeter on Pin B of the throttle position sensor.
Move the throttle from low idle to high idle and monitor the duty cycle output of the throttle position sensor on the multimeter.Expected Result:The duty cycle should be between 5.0 percent and 10.0 percent when the throttle is at low idle. The duty cycle should be 90.0 percent to 95.0 percent when the throttle is at high idle.Results:
OK - A valid signal appears at the sensor connector. Proceed to Test Step 5.
Not OK - The duty cycle is out of the range.Repair: Perform the following diagnostic procedure.Refer to Troubleshooting, "Throttle Position Sensor - Calibrate". Stop.Test Step 4. Measure No-Load Battery Voltage
Measure the no-load battery