ENGINE AR-COMPLETE 4154109 - Caterpillar

Depressing the right brake pedal switch will disable the throttle lock feature. The previous engine speed (rpm) that has been set may be resumed by pressing the "Resume/Accel" switch. The ECM will disable the throttle lock feature if the switch inputs to the right brake pedal switch become invalid. The feature will remain disabled until the keyswitch has been turned OFF and the keyswitch has been turned ON.
Illustration 1 g00734314
Schematic
Test Step 1. Inspect Electrical Connectors and Wiring
Turn the keyswitch to the OFF/RESET position.
Thoroughly inspect the right hand brake pedal switch, the ECM connector J1/P1, the machine connector J3/P3, and the associated wiring. Refer to Troubleshooting, "Electrical Connectors - Inspect" for details. Expected Result:All connectors, pins, and sockets should be completely inserted and coupled. The harness and wiring should be free of corrosion, abrasion, and pinch points.Results:
OK - Proceed to Test Step 2.
Not OK - Repair: Repair the circuit.Verify that the repair eliminates the problem.STOPTest Step 2. Check the Status on ET
Connect ET to the service tool connector.
Turn the keyswitch to the ON position.
Observe the status for "Brake Pedal" on ET while you operate the right brake pedal. Expected Result:The status for the right hand brake pedal switch should read "Depressed" when the brake pedal is depressed. The status for the right hand brake pedal switch should read "Released" when the brake pedal is released.Results:
OK - The right hand brake pedal switch is operating properly at this time.Repair: Refer to Troubleshooting, "Electrical Connectors - Inspect" if the problem is intermittent.STOP
Not OK - Proceed to Test Step 3.Test Step 3. Short the Wires at the Right Brake SwitchNote: Record the switch wiring for correct reconnection before removing wires.
Turn the keyswitch to the OFF position.
Disconnect the wires from the right hand brake switch.
At the switch, short wires F721-GY(Grey) and 998-BR(Brown) together. Wire F722-OR(Orange) should remain open.
Turn the keyswitch to the ON position, and observe the status for "Brake Pedal" on ET.
Turn the keyswitch to the OFF position. Disconnect the F721-GY(Grey)wire and the 998-BR(Brown)wire, and short the F722-OR(Orange) wire and the 998-BR(Brown) wire together. Wire F721-GY(Grey) should remain open.
Turn the keyswitch to ON position, and observe the status for "Brake Pedal" on ET.
Disconnect the shorted wires, and leave the wires disconnected at the switch. Expected Result:The "Brake Pedal" status should read "Released" when F721-GY(Grey) and 998-BR(Brown) are shorted together. The status should read "Depressed" when F722-OR(Orange) and 998-BR(Brown) are shorted together.Results:
OK - The ECM and the wiring harness are functioning properly. Replace the right hand brake switch. Verify that the repair eliminates the problem.STOP
Not OK - Proceed to Test Step 3.Test Step 4. Check for a Short Circuit in the Wiring Harness
Illustration 2 g00759613
ECM connector P1
Disconnect ECM connector J1/P1, and ensure that the wires at the right hand brake pedal switch are disconnected.
Measure the following resistances:
P1:13 (RH Service Brake Switch (NO)) and P1:29 (Digital Return)
P1:19 (RH Service Brake Switch (NC)) and P1:29 (Digital Return)
P1:13 (RH Service Brake Switch (NO)) and P1:19 (RH Service Brake Switch (NC))
P1:19 (RH Service Brake Switch (NC)) and the engine