G3400 Engines (EIS) Caterpillar

Shutdown Relay

Usage:

System Operation Description:

The control module for the Electronic Ignition System (EIS) activates the output for the shutdown relay when the engine must be shut down due to an undesirable condition.

The control module can sink a maximum of 200 mA through this output. A flyback diode is included in the internal circuit. The diode protects the module from voltage spikes that can occur when a relay is activated.

The device that is connected to the output can be a relay or another module. If the engine is equipped with a Status Control Module (SCM), this output is connected to an input on the SCM. The SCM will stop the flow of fuel when this output is activated.

If this output is connected to the coil of a relay, the other side of the coil must be connected to the +Battery.

The control module monitors the output for these faults:

An Open Circuit - The control module detects this fault when the engine is running and when the engine is not running. If the engine is not running, the engine will not start. If the engine is running, the control module will signal for a shutdown, but the engine will not shut down. A 322-05 diagnostic code will be generated. The output for the warning lamp will also be activated.

Short to −Battery - The control module detects this fault when the engine is running and when the engine is not running. The control module will signal for a shutdown and the engine will shut down. A 322-05 diagnostic code will be generated. The output for the warning lamp will also be activated.

Short to +Battery - The control module detects this fault only when the engine is running. The control module will terminate the ignition and the engine will shut down. A 322-03 diagnostic code will be generated. The output for the warning lamp will not be activated.

The most likely cause of a faulty circuit is a problem with the wiring. The next likely cause is a problem with the output device. The least likely cause is a problem with the EIS control module.

Show/hide table




Illustration 1	g01174001
Schematic diagram of the output for the shutdown relay The engine is equipped with a 70 pin connector.

Show/hide table




Illustration 2	g01045640
Schematic diagram of the output for the shutdown relay The engine is equipped with a remote control panel that includes a status control module.

Test Step 1. Inspect the Electrical Connectors and the Wiring

Set the engine control to the OFF/RESET mode. Remove the electrical power from the engine.

Note: For the following steps, refer to Troubleshooting, "Inspecting Electrical Connectors".

Thoroughly inspect each of the following connectors:
- EIS connectors on the control module
- Connections for the equipment that is connected to the output for the shutdown relay
1. Perform a 45 N (10 lb) pull test on each of the wires that are associated with the output for the shutdown relay.
1. Check the terminal strips for corrosion and for mechanical failure.
1. If the engine is equipped for CSA, check the harnesses and the wiring for abrasion and for pinch points between the device that is connected to the output and the control module.

Expected Result:

The connectors, pins, and sockets are connected properly. The terminal strips do not have corrosion or mechanical failure. The connectors and the wiring do not have corrosion, abrasion, or pinch points.

Results:

OK - The components are in good condition with proper connections.
Not OK - The components are not in good condition and/or at least one connection is improper.
Repair: Perform the necessary repairs and/or replace parts, if necessary.
STOP

Test Step 2. Check for an Open Circuit

Disconnect the EIS connector.

At the output device, identify the wire that runs to the EIS control module. If the engine is equipped with a SCM, the wire is connected to terminal 15 on the back of the SCM. Disconnect the end of the wire from the device. This will isolate the wire.

Check the continuity of the wiring between terminal EISC-F and the end of the wire that was disconnected from the output device.

Expected Result:

The wiring has continuity.

Results:

OK - The wiring has continuity. Proceed to Test Step 4.
Not OK - The wiring does not have continuity.
Repair: Repair the connection and/or the wire, when possible. Replace parts, if necessary. Verify that the problem is resolved.
STOP

Test Step 3. Check the Wiring from the Output Device to the +Battery for an Open Circuit

Check the wiring that runs between the output device and the +Battery for an open circuit.

Expected Result:

The wiring has continuity.

Results:

OK - The wiring has continuity. Proceed to Test Step 4.
Not OK - The wiring is an open circuit.
Repair: Repair the connection and/or the wire, when possible. Replace parts, if necessary. Verify that the problem is resolved.
STOP

Test Step 4. Check for a Short Circuit

Measure the resistance between terminal EISC-F and all of the other terminals on the EIS connector.

Expected Result:

All of the measurements indicate an open circuit.

Results:

OK - All of the measurements indicate an open circuit.
Repair: Perform the following procedure:
1. Temporarily install a new output device. The output device may be a relay or a SCM.
1. Restore the electrical power to the engine. Determine if the problem is resolved. If the problem is resolved, STOP.
If the problem is not resolved, reinstall the original output device. Proceed to Test Step 5.

Test Step 5. Perform a Self Test of the EIS Control Module

Perform the self test for the EIS control module. Refer to Troubleshooting, "Control Module Self Test".

Expected Result:

The self test was successful.

Results:

OK - The self test was successful.
Repair: If the problem persists, refer to Troubleshooting, "Inspecting Electrical Connectors".
STOP
Not OK - The self test was not successful.
Repair: Perform the corrective action that is appropriate for the fault. Refer to Troubleshooting, "Control Module Self Test". Verify that the original problem is resolved.
STOP