3512B Engine for SPF343, SPS343, and SPT343 Pumpers Caterpillar

Note: The "Emergency Kill" switch is DISABLED when the "Deck Engine Control Mode" switch is in the J-Box position. The "Deck Engine Control Mode" switch is located on the side of the Junction Box.

Note: The "Emergency Kill" switch is activated or ON when the switch is in the ON position. The "Emergency Kill" switch is deactivated or OFF when the "Emergency Kill" switch is in the OFF position.

When the "Emergency Kill" switch is active, the engine will not run. The Electronic Control Module (ECM) will also trigger the Air Shutoff. When the "Emergency Kill" switch is activated, the "Emergency Kill Relay" is activated. A set of contacts that are normally closed opens up. The open contacts remove the digital ground from the two emergency shutdown inputs of the ECM. The fuel supply to the injectors will be cut off and the air shutoff relays will be activated.

The ECM receives two signals from the "Emergency Kill" switch. The signals allow the ECM to determine the status of the "Emergency Kill" switch. The ECM will shut down the engine when both of the signals are open. When both of the signals are connected to the digital return the switch is NOT active and the engine will run.

If two different signals are detected during the powerup, the ECM will determine that one of the signals is incorrect. A diagnostic code will be logged and a diagnostic code will remain active. The engine will continue to run when the ECM detects two different signals. If both of the signals are open, the engine will stop.

Illustration 1	g00856337
Typical example

Test Step 1. Check for Connector Damage.

1. Turn the main disconnect switch to the OFF position.

2. Turn the circuit breaker CB-8 to the OFF position.

3. 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.

4. Perform a 45 N (10 lb) pull test on each of the wires in the ECM connector that are associated with the circuit.

5. Check the ECM connector (allen head screw) for the proper torque of 6.0 N·m (55 lb in).

6. Check the customer connector (allen head screw) for the proper torque of 2.25 ± 0.25 N·m (20 ± 2 lb in).

7. 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 connectors and wiring are okay. Proceed to test step 2.

• Not OK - The connectors and/or wiring need repair.

  Repair: Repair the connectors and/or wiring or replace the connectors and/or wiring.

  Stop.

Test Step 2. Check the Status while the "Emergency Kill" Switch is Active.

1. Start the Caterpillar Electronic Technician (ET).

2. Turn the main disconnect switch to the ON position.

3. Turn the circuit breaker CB-8 to the ON position.

4. Activate the "Emergency Kill" switch. If multiple switches have been installed, ensure that any other "Emergency Kill" switch has not been activated.

5. Observe the status of the "Emergency Kill" switch on the Cat ET.

Expected Result:

The parameter for the "Emergency Kill" switch should read "ON".

Results:

• OK - The "Emergency Kill" switch is working correctly. Proceed to test step 3.

• Not OK - The parameter for the "Emergency Kill" switch does not display "ON". Proceed to test step 4.

Test Step 3. Check the Status while the "Emergency Kill" Switch is Not Active.

1. Deactivate the "Emergency Kill" switch.

2. Observe the status of the "Emergency Kill" switch on the Cat ET.

Expected Result:

The parameter for the "Emergency Kill" switch should read "OFF".

Results:

• OK - The "Emergency Kill" switch is functioning correctly.

  Repair: There may be an intermittent problem. Perform the diagnostic functional test Troubleshooting, "Inspecting Electrical Connectors" if the problem is intermittent.

  Stop.

• Not OK - The parameter for the "Emergency Kill" switch does not display "OFF". Proceed to test step 4.

Test Step 4. Test the Input for the "Emergency Kill" Switch to the ECM.

1. Turn the circuit breaker CB-8 to the OFF position.

2. Disconnect ECM connector P1 from the ECM. Remove the socket pins P1-29, P1-02 and P1-20 from ECM connector P1.

   Note: Disconnecting the common sensor wire from the ECM will generate an open circuit diagnostic code for all sensors that are connected to the sensor common. Troubleshoot the original diagnostic code. Delete the logged diagnostic codes when you are finished.

3. Insert a wire jumper into the sockets for the wires in P1-29, P1-02 and P1-20, that were removed in the previous step.

4. Reconnect connector P1 to ECM connector J1.

5. Turn the circuit breaker CB-8 to the ON position.

6. Observe the parameters for the "Emergency Kill" switch on the Cat ET.

7. Turn the circuit breaker CB-8 to the OFF position.

8. Locate a suitable jumper wire and connect P1-02 and P1-20 to P1-29.

9. Turn the circuit breaker CB-8 to the ON position.

10. Observe the parameters for the "Emergency Kill" switch on the Cat ET.

11. Turn the circuit breaker CB-8 to the OFF position.

12. Remove the wire jumpers. Replace all wires and reconnect all connectors.

Expected Result:

The parameter for the "Emergency Kill" switch should display "OFF" when the jumper is installed. The parameter for the "Emergency Kill" switch should display "ON" when the jumper is removed.

Results:

• OK - The parameter for the "Emergency Kill" switch is displaying the proper states. The problem is not with the ECM. Proceed to test step 5.

• Not OK - The parameter for the "Emergency Kill" switch is not displaying the proper states.

  Repair: Replace the ECM. Perform the diagnostic procedure Troubleshooting, "Replacing the ECM".

  Stop.

Test Step 5. Check the Wiring of the "Emergency Kill" Switch Circuit.

1. Disconnect ECM connector J1/P1.

2. Install a wire jumper between terminal 2 and terminal 10 on the "Emergency Kill Relay".

3. Measure the resistance between P1-29 and P1-20.

4. Measure the resistance between P1-29 and P1-2.

5. Remove the wire jumper from terminal 2 and terminal 10 on the "Emergency Kill Relay".

Expected Result:

The resistance should measure less than 10 Ohms.

Results:

• OK - The resistance measures less than 10 Ohms. Proceed to test step 7.

• Not OK - The resistance measures more than 10 Ohms. Proceed to test step 6.

Test Step 6. Check the "Emergency Kill" Switch Circuit in the "ADEM Box".

1. Disconnect ECM connector J1/P1.

2. Install a wire jumper between terminal 2 and terminal 10 on the "Emergency Kill Relay".

3. Measure the resistance between terminal 101 and terminal 102 in the "ADEM Box".

4. Measure the resistance between terminal 101 and terminal 123 in the "ADEM Box".

5. Measure the resistance between terminal 101 and terminal 127 in the "ADEM Box".

6. Remove the wire jumper from terminal 2 and terminal 10 on the "Emergency Kill Relay". Reconnect ECM connector J1/P1.

Expected Result:

The resistance should measure less than 10 Ohms for each measurement.

Results:

• OK - The resistance measures less than 10 Ohms for each measurement.

  Repair: The wiring and/or the connectors between the "ADEM Box" terminals 101 and 127 and the ECM connector P1 need repair. Repair the connectors and/or wiring or replace the connectors and/or wiring.

  Stop.

• Not OK - The resistance measures more than 10 Ohms on one of the measurements.

  Repair: Check the component and/or the terminal before the incorrect resistance measurement. Repair the faulty component or replace the faulty component. Refer to Illustration 1.

  Stop.

Test Step 7. Check the Normally Closed Contacts on the "Emergency Kill Relay".

1. Remove the wire from terminal 2 of the normally closed contacts of the "Emergency Kill Relay".

2. Ensure that the main disconnect switch is in the ON position.

3. Turn the circuit breaker CB-8 to the ON position.

4. Activate the "Emergency Kill" switch.

5. Measure the resistance between the normally closed contacts on terminal 2 and terminal 10 of the "Emergency Kill Relay".

6. Deactivate the "Emergency Kill" switch. Reconnect the wire that was removed from terminal 2 of the "Emergency Kill Relay".

Expected Result:

The resistance should be greater than 20,000 Ohms when the "Emergency Kill" switch is activated.

Results:

• OK - The resistance is greater than 20,000 Ohms.

  Repair: The "Emergency Kill" switch circuit is working correctly. There may be an intermittent problem. Perform the diagnostic functional test Troubleshooting, "Inspecting Electrical Connectors" if the problem is intermittent.

  Stop.

• Not OK - The resistance is less than 20,000 Ohms. Proceed to test step 8.

Test Step 8. Check the Voltage to the Coil of the "Emergency Kill Relay".

1. Activate the "Emergency Kill" switch.

2. Measure the voltage between terminal 13 and terminal 14 of the "Emergency Kill Relay".

3. Measure the voltage between terminal 13 of the "Emergency Kill Relay" and terminal 2 in the Junction Box.

4. Deactivate the "Emergency Kill" switch.

Expected Result:

The voltage should measure 12 ± 1 VDC.

Results:

• OK - The voltage measures 12 ± 1 VDC between terminal 13 and terminal 14 of the "Emergency Kill Relay".

  Repair: The normally closed contacts between terminal 2 and 10 of the "Emergency Kill Relay" or the coil of the "Emergency Kill Relay" is faulty. Replace the "Emergency Kill Relay". Verify that the circuit is working properly.

  Stop.

• Not OK - The voltage does not measure 12 ± 1 VDC between terminal 13 and terminal 14 of the "Emergency Kill Relay". The voltage measures 12 ± 1 VDC between terminal 13 and terminal 2 in the Junction Box.

  Repair: Check the wire between terminal 14 of the "Emergency Kill Relay" and terminal 2 in the Junction Box for continuity. If the wire is okay replace the "Emergency Kill Relay".

  Stop.

• Not OK - The voltage does not measure 12 ± 1 VDC on either measurement. Proceed to test step 9.

Test Step 9. Check the Voltage to the "Emergency Kill" Switch.

1. Measure the voltage between terminal 2 on the "Emergency Kill" switch and the - Battery terminal.

Expected Result:

The voltage should measure 12 ± 1 VDC.

Results:

• OK - The voltage measures 12 ± 1 VDC.

  Repair: Check the wire from terminal 1 of the "Emergency Kill" switch to terminal 13 of the "Emergency Kill Relay" for continuity. Replace the "Emergency Kill" switch if the wire is okay. Repair the wire if the wire is not okay. Verify that the circuit is working properly.

  Stop.

• Not OK - The voltage does not measure 12 ± 1 VDC.

  Repair: Ensure that circuit breakers CB-1 and CB-2 are not tripped. Check the wiring from the "Emergency Kill" switch to the Battery for damage. Check the main disconnect switch for proper operation. Check that the "Deck Engine Control Mode" switch is in the REMOTE position. The "Deck Engine Control Mode" switch is located on the side of the Junction Box.

  Stop.