RELAY 0813944 - Caterpillar

System Operation Description:The control module for the Electronic Ignition System (EIS) has the ability to perform a self test. An electronic service tool and a 7X-1713 Test Harness are required in order to perform the self test.The test harness must be well maintained. The connectors on the test harness must be clean and dry. There may be a problem with the test harness if both of these conditions are true:
The self test fails repeatedly.
More than one control module fails the self test.The test harness is connected to the EIS control module. The test harness electrically connects the outputs from the control module to the inputs of the control module.An electronic service tool is also connected to the test harness. The electronic service tool initiates the tests. The electronic service tool also displays the results of the tests.The self test consists of two parts. The parts of the test are test A and test B. Both of the tests must be performed in order to completely check the control module.Either the Digital Diagnostic Tool (DDT) or the Caterpillar Electronic Technician (ET) may be used to perform the self test. In either case, the electronic service tool provides the following information:
Steps that must be performed by the operator
The progress of the self test
Faults that occur during the self testTest Step 1. Inspect the Test HarnessInspect the 7X-1713 Test Harness. Check for loose wires. Check the connectors for moisture, for contamination, and for damage.Expected Result:The test harness is in good condition.Results:
OK - The test harness is in good condition. Proceed to Test Step 2.
Not OK - The test harness is not in good condition.Repair: Repair the harness or replace the harness.STOPTest Step 2. Configure the Engine for the Self Test
Remove the electrical power from the engine.
Disconnect the EIS connectors.
Illustration 1 g01342798
Configurations of the harnesses for self testThe 7X-1570 Data Link Cable As is cancelled and replaced by the 140-9442 Adapter Cable As . (A) DDT (B) Cat ET
Refer to Illustration 1. Connect the harnesses according to the configuration that is appropriate for the electronic service tool.Note: Leave connector "C" disconnected.
Restore the electrical power to the engine.
Set the engine control to the "STOP" mode.
Verify that the service tool is communicating with the EIS control module.Note: Disregard any diagnostic codes. Clear the codes after you complete this entire procedure.Expected Result:The electronic service tool is communicating with the EIS control module.Results:
OK - The electronic service tool is communicating with the EIS control module. Proceed to Test Step 3.
Not OK - The electronic service tool is not communication with the EIS control module.Repair: Perform the following procedure:
Verify that the harnesses are configured correctly.
Verify that the electronic service tool is receiving electrical power. Refer to Troubleshooting, "Electrical Power Supply".
If the problem persists, connect the harnesses to a different engine. Verify that the harnesses are not the source of the problem. Refer to Troubleshooting, "Electronic Service Tool Will Not Communicate with ECM", if necessary.STOPTest Step 3. Perform Test A
Prepare the electronic service tool for the self test.
For the