0388662 JOHNSON LEVER AND SHAFT, Lock

Illustration 1 g01067298
Schematic for the speed control circuit
Test Step 1. INSPECT ELECTRICAL CONNECTORS AND WIRING
Turn the ECS to the OFF/RESET position.
Thoroughly inspect the ECM connectors J1/P1 and J2/P2. Inspect all of the other connectors. Refer to the diagnostic functional test 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 for pinch points. 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 - The connectors and wiring are okay. Proceed to Test Step 2.
Not OK - The connectors and/or wiring are not okay.Repair: Repair the connectors or wiring and/or replace the connectors or wiring.STOPTest Step 2. CHECK THE SUPPLY VOLTAGE TO THE SPEED CONTROL.
Turn the circuit breaker at the battery to the ON position.
Turn the ECS to the STOP position.
Connect one probe of a voltage test lamp to the +Battery terminal of the speed control. Connect one probe of the voltage test lamp to the −Battery terminal of the speed control. Note: Connect one probe of a voltage test lamp to the +Battery. Connect the other probe of the test lamp to the -Battery in order to verify that the voltage test lamp is functioning properly. The lamp bulb will illuminate if the voltage test lamp is functioning properly.Expected Result:The voltage test lamp is illuminated.Results:
OK - The voltage supply to the speed control is correct. Proceed to Test Step 3.
Not OK - The test lamp did not illuminate.Repair: Repair the supply circuit for the speed control.STOPTest Step 3. DETERMINE THE COMPONENT THAT HAS FAILED.
Determine if the problem is with the input for the "Speed Control: Throttle" or with the "Speed Control: Droop".
Select "UNSURE" if the source of the problem is unknown. Expected Result:The throttle position on the Caterpillar Electronic Technician (ET) varies with the turning of the speed adjust potentiometer. The droop on Cat ET varies with the turning of the droop adjust potentiometer.Results:
"Rated Speed" - The throttle position on Cat ET does not vary with the turning of the speed adjust potentiometer. Proceed to Test Step 4.
"Droop Speed" - The droop on Cat ET does not vary with the turning of the droop adjust potentiometer. Proceed to Test Step 5.
Unsure - The problem is not apparent. Proceed to Test Step 4.Test Step 4. CHECK THE THROTTLE POSITION
Turn the ECS to the STOP position.
Observe the position of the throttle on Cat ET.
Turn the speed adjust potentiometer to the lowest setting.
60 Hz equals 1369 rpm
50 Hz equals 1141 rpm
Start at the low idle position. Slowly turn the speed adjust potentiometer in the other direction. Monitor the position of the throttle on Cat ET. Expected Result:The throttle position on Cat ET reads 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.Repair: The problem may be intermittent. If the problem is intermittent, perform the diagnostic functional test Troubleshooting, "Inspecting Electrical Connectors".STOP
Not OK - The throttle position on Cat ET does not vary as the speed adjust potentiometer is adjusted. Proceed to Test Step 6.Test Step 5. CHECK THE "SPEED CONTROL: DROOP SIGNAL" ON CAT ET.
Turn the ECS to the STOP position.
Observe the droop on Cat ET.
Slowly turn the droop adjust potentiometer in a clockwise direction. Monitor the droop on Cat ET. Note: Do not overturn the droop adjust potentiometer in the clockwise direction. The signal will become erratic.
Monitor the speed droop on Cat ET. Turn the droop adjust potentiometer in a counterclockwise direction. Expected Result:The droop on Cat ET reads 0 percent at the lowest setting and 0 to 10 percent as the droop adjust potentiometer is adjusted.Results:
OK - The droop is operating correctly.Repair: The problem may be intermittent. If the problem is intermittent, perform the diagnostic functional test Troubleshooting, "Inspecting Electrical Connectors".STOP
Not OK - The droop on Cat ET does not vary as the droop adjust potentiometer is adjusted. Proceed to Test Step 7.Test Step 6. CHECK THE SPEED CONTROL.
Remove the wire from the S terminal at the speed control.
Set the multimeter to "VDC". Press the "Hz" button twice so that the % symbol is displayed.
Place one probe of the multimeter on the S terminal of the speed control. Place the other probe on the −Battery terminal of the speed control.
Monitor the output of the percent duty cycle from the speed control on the multimeter. Turn the speed adjust potentiometer from the low setting to the high setting. Note: The throttle position on Cat ET will not match the percent duty cycle on the multimeter.Expected