SPRING GP-RECOIL 4388951 - Caterpillar

Illustration 1 g00934772
SchematicTest Step 1. Inspect Electrical Connectors and Wiring
Turn the keyswitch to the OFF/RESET position.
Thoroughly inspect the throttle lock switch, the J1/P1 ECM connector, the J3/P3 machine connector, 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. Stop.Test Step 2. Check the Status on the Electronic Service Tool
Connect the electronic service tool to the service tool connector.
Turn the keyswitch to the ON position.
Observe the status for "Throttle Lock Switch" on the electronic service tool while you operate the throttle lock switch.Expected Result:The status for "Throttle Lock Switch" should read "ON" when the throttle lock switch is pressed once. The status for "Throttle Lock Switch" should read "OFF" when the throttle lock switch is pressed again.Results:
OK - The throttle lock switch is operating properly at this time.Repair: Refer to Troubleshooting, "Electrical Connectors - Inspect" if the problem is intermittent. Stop.
Not OK - The throttle lock switch is not operating correctly. Proceed to Test Step 3.Test Step 3. Short the Wires at the Throttle Lock Switch
Turn the keyswitch to the OFF position.
Disconnect J87/P87 connector at the throttle lock switch.
Make a short jumper wire with male spade terminals on each end.
Connect the jumper wire across terminals 2 and 3 on the J87/P87 connector.
Turn the keyswitch to the ON position, and observe the status for "Throttle Lock Switch" on the electronic service tool.Note: The status should be "OFF".
Momentarily connect the jumper wire to terminals 2 and 1. Return the jumper wire to terminals 2 and 3.
Observe the status for "Throttle Lock Switch" on the electronic service tool.Note: The status should be "ON".
Momentarily connect the jumper wire to terminals 2 and 1. Return the jumper wire to terminals 2 and 3.
Observe the status for "Throttle Lock Switch" on the electronic service tool.Note: The status should be "OFF".
Leave the connector disconnected from the switch. Remove the jumper wire.Expected Result:The status should change from "OFF" to "ON" when the jumper wire is placed on terminals 2 and 1. The status should change from "ON" to "OFF" when the jumper wire is placed on terminals 2 and 1 again.Results:
OK - The ECM and the wiring harness are functioning properly. Replace the throttle lock 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 g00934800
ECM connector P1
Disconnect ECM connector J1/P1, and ensure that the wires at the throttle lock switch are disconnected.
Measure the following resistances:
P1:14 (Throttle Lock Switch (NC)) to P1:29 (Digital Return)
P1:20 (Throttle Lock Switch (NO)) to P1:29 (Digital Return)
P1:14 (Throttle Lock Switch (NC)) to P1:20 (Throttle Lock Switch (NO))
P1:20 (Throttle Lock Switch (NO)) and the engine ground
P1:14 (Throttle Lock Switch (NC)) and the engine groundExpected Result:The resistance should be greater than 20,000