KIT-LINING 1G8743 - Caterpillar

Illustration 1 g03710730
(1) Common
(2) Relay coil
(3) N.C. contact
(4) N.O. contact
(5) Relay coil
Table 1
The Engine Does Not Start in Remote Control Mode
Troubleshooting Test Steps Values Results
Test Step 1. Check the Display for Faults
A. Check the Display for Faults
No faults are displayed. OK – No faults are displayed.
Proceed to Test Step 2.
Not OK – There is a fault on the display.
Repair: Correct the fault and check machine operation.
STOP.
Test Step 2. Check the Position of the Emergency Stop Buttons
A. Check the position of the emergency stop buttons.
The emergency stop buttons are pulled out. OK – The emergency stop buttons are pulled out.
Proceed to Test Step 3.
Not OK – The emergency stop buttons are not pulled out.
Repair: Pull out any emergency stop buttons that are pushed in. Check machine operation.
STOP.
Test Step 3. Ensure that the Machine has Power
A. Check for machine power.
The machine has power. OK – The machine has power.
Proceed to Test Step 4.
Not OK – The machine does not have power.
Repair: Refer to "Power the Machine" to power the machine.
STOP.
Test Step 4. Visually Inspect the Engine Start Relay
A. Inspect the Engine Start Relay.
Check the housing for cracks or other damage.
Check the relay for damaged, burnt, or bent terminals.
The relay shows no signs of damage. OK – The relay shows no signs of damage.
Proceed to Test Step 5.
Not OK – The relay appears damaged.
Repair: Replace the relay and check machine operation.
STOP.
Test Step 5. Test the Relay in the Deenergized State
A. Remove the electrical power from the ECM.
B. Disconnect the relay from the circuit.
C. Verify the operation of the relay in the deenergized state
D. Measure continuity across the following terminals of the relay:
Terminal 1 to terminal 3
Terminal 5 to terminal 2
Terminal 1 to terminal 4
Refer to Illustration 1 .
The following results were obtained:
Terminal 1 to terminal 3 indicated a short circuit.
Terminal 5 to terminal 2 indicated some measured resistance.
Terminal 1 to terminal 4 indicated an open circuit.
Refer to Illustration 1 . OK – Each measurement was correct.
Proceed to Test Step 6.
Not OK – A measurement was incorrect.
Repair: Replace the relay and retest the circuit.
STOP.
Test Step 6. Test the Relay in the Energized State
A. Apply the appropriate voltage across the coil of the relay. The following results were obtained:
Terminal 1 to terminal 3 indicated an open circuit.
Terminal 1 to terminal 4 indicated a short circuit.
Refer to Illustration 1 . OK – Each measurement was correct.
Proceed to Test Step 7.
Not OK – A measurement was incorrect.
Repair: Replace the relay and retest the circuit.
STOP.
Test Step 7. Check the Engine Keyswitch
A. Remove the connector from the switch.
B. Measure the resistance between switch contacts with the switch in the ON position and then in the OFF position.
C. Record the results.
The resistance measurements meet the specifications. OK – The resistance measurements meet the specifications.
Proceed to Test Step 8.
Not OK – The resistance measurements do not meet the specifications.
Repair: Replace the Engine Keyswitch and check the machine operation.
STOP.
Test Step 8. The Harness Between the Engine Keyswitch and the ECM has Failed.
Using the system electrical schematic, check the harness and connectors