GUARD GP-BOTTOM 2G9660 - Caterpillar

Illustration 1 g00696374
Test Step 1. Check the Electrical Connectors and the Wiring.
Turn the Battery switch for the ECM to the OFF position.
Turn the breaker at the battery to the OFF position.
Thoroughly inspect the ECM connector J1/P1 and J2/P2. Inspect all of the other connectors. Refer to Troubleshooting, "Inspecting Electrical Connectors" for details.
Perform a 45 N (10 lb) pull test on each of the wires in the ECM connector that are associated with the circuit.
Check the ECM connector (allen head screw) for the proper torque of 6.0 N m (55 lb in).
Check the customer connector (allen head screw) for the proper torque of 2.25 0.25 N m (20 2 lb in).
Check the harness and the wiring for abrasion and pinch points.Expected Result:All connectors, pins, and sockets are completely coupled and/or inserted, and the harness and wiring should be free of corrosion, abrasion or pinch points.Results:
OK - The wiring and connectors are okay. Proceed to Test Step 2.
Not OK - 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 the Voltage at the Speed Control.
Connect the red probe of the digital multimeter to the + Battery terminal of the Speed Control. Connect the black probe of the digital multimeter to the − Battery terminal of the Speed Control.
Turn the breaker at the battery to the ON position.
Turn the Battery switch for the ECM to the ON position.Expected Result:The digital multimeter should read 24 5 VDC.Results:
OK - The digital multimeter reads 24 5 VDC. The voltage supply to the Speed Control is correct. Proceed to test step 3.
Not OK - The digital multimeter did not read 24 5 VDC. There is a problem with the supply voltage to the Speed Control.Repair: Check the voltage at the battery. If the voltage at the battery is correct repair the connectors and/or the wiring between the speed control and the battery. If the battery voltage is incorrect refer to Testing and Adjusting, "Electrical System".STOPTest Step 3. Check the Throttle Position on the ET.
Turn the Battery switch for the ECM to the OFF position.
Connect the ET to the service tool connector.
Turn the Battery switch for the ECM to the ON position.
Observe the position of the throttle on the ET.
Turn the speed adjust potentiometer to the lowest setting.
Start at the low idle position. Slowly turn the speed adjust potentiometer in the other direction. Monitor the position of the throttle on the ET.Expected Result:The throttle position on the ET should read 0 percent at the lowest setting and 0 to 100 percent as the speed adjust potentiometer is adjusted.Results:
OK - The Speed Control is operating correctly.STOP
Not OK - The throttle position on the ET does not respond correctly to adjustments in the speed adjust potentiometer. Proceed to test step 4.Test Step 4. Check the Signal