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 As 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 test
Test Step 1. Inspect the Test Harness
Inspect the 7X-1713 Test Harness As. 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.
STOP
Test Step 2. Configure the Engine for the Self Test
- Remove the electrical power from the engine.
- Disconnect the EIS connectors.
- Connect the harnesses. Refer to Illustration 1.
Note: Leave connector "C" disconnected.
Illustration 1 | g01157197 |
Configuration of the harnesses for self test |
- 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.
STOP
Test Step 3. Perform Test A
- Prepare the DDT for the self test.
- By using the DDT, scroll to menu 49. The screen on the DDT will display "PRESS <ALT 1> KEY".
- By using the DDT, scroll to menu 49. The screen on the DDT will display "PRESS <ALT 1> KEY".
- Connect connector "A" to connector "C".
- Initiate test A by pressing the "ALT1" key.
Expected Result:
The electronic service tool indicates that test A is in progress. When test A is complete, the electronic service tool will display a prompt.
Results:
- OK - The control module successfully completes test A. Proceed to Test Step 4.
- Not OK - The control module fails test A. The electronic service tool indicates the failure. Proceed to Test Step 5.
Test Step 4. Perform Test B
- Disconnect connector "A" from connector "C".
Note: Connector "B" must be connected to connector "C" within five minutes or the self test will fail. If this occurs, restart the self test from "Test Step 3. Perform Test A".
- Connect connector "B" to connector "C".
Note: Wait for three seconds after connector "B" is connected to connector "C". Test B will begin automatically.
Expected Result:
The electronic service tool indicates that test B is in progress. When test B is complete, the electronic service tool indicates that the self test was successful.
Results:
- OK - The EIS control module successfully completes test B.
Repair: Perform the following procedure:
- Set the engine control to the "OFF/RESET" mode.
- Remove the electrical power from the engine.
- Disconnect the test harness from the EIS control module.
- Connect the engine harness to the EIS control module.
- Restore the electrical power to the engine.
- Clear any diagnostic codes. If you were directed to this test procedure by a different test procedure, return to that procedure now.
STOP
- Not OK - The EIS control module fails the test. The electronic service tool indicates the failure. Proceed to Test Step 5.
Test Step 5. Identify the Fault for the EIS Control Module
- Identify the fault that is displayed on the electronic service tool.
- Refer to Table 1. Perform the corrective action that applies to the code.
Show/hide table
Table 1 Diagnostic Codes for the Self Test     Code     The Internal Circuit that Failed     Corrective Action     1     Sensor inputs
Output for the warning lamp
Shutdown relay output
Sensor supply    Replace the EIS control module.     2     Connector B was connected during test A.
Switch inputs
Output for the shutdown lamp    Refer to "Results:" for this procedure.     3     Switch inputs
Output for the shutdown lamp    Replace the EIS control module.     4     Switch inputs
Output drivers for the ignition transformers    5     Switch inputs
Output for the warning lamp    6     Sensor inputs
Sensor supply
Output for the warning lamp
Shutdown relay output    7     Switch inputs
Output for the shutdown lamp    8     Switch inputs     9     Output for the shutdown lamp     10     Input for the timing calibration
Shutdown relay output
Sensor supply    11     Internal failure of the EIS control module     12     Inputs for the detonation sensors     13     Internal failure of the EIS control module     14     Inputs for the detonation sensors     15     Inputs for the detonation sensors
Output drivers for the ignition transformers    16     Internal failure of the EIS control module     17     Internal failure of the EIS control module     18     Internal failure of the EIS control module     19     Input for the right detonation sensor
Output drivers for the ignition transformers    20     Input for the right detonation sensor     21     Input for the left detonation sensor     Replace the EIS control module.     22     Input for the left detonation sensor     23     Sensor inputs
Output for the warning lamp
Shutdown relay output
Sensor supply
Returns for the ignition transformers    24     Switch inputs
Output for the shutdown lamp    25     Switch inputs
Output for the shutdown lamp    26     Switch inputs     27     Output drivers for the ignition transformers
Returns for the ignition transformers    28     Output drivers for the ignition transformers
Returns for the ignition transformers    29     Inputs for the detonation sensors
Output drivers for the ignition transformers    30     Output drivers for the ignition transformers
Returns for the ignition transformers    31     Sensor supply
Output for the warning lamp    32     Internal failure of the EIS control module     33     Sensor supply
Inputs for the detonation sensors    34     Internal failure of the EIS control module     35     Sensor supply     36     Sensor supply
Output for the warning lamp    37     Returns for the ignition transformers
Shutdown relay output    38     Returns for the ignition transformers
Shutdown relay output    39     Output drivers for the ignition transformers
Returns for the ignition transformers    41     Output drivers for the ignition transformers
Returns for the ignition transformers    42     The values of the programmable parameters are faulty.
Internal failure of the EIS control module    Refer to "Results:" for this procedure.     50     Connector B was not connected within five minutes of the completion of test A.
Sensor grounds    
- If the corrective action is "Replace the EIS Control Module", refer to Troubleshooting, "Replacing the EIS Control Module".
Results:
- Code 2 - The self test failed.
Repair: Connector "B" may have been connected during test A. Alternatively, the EIS control module may have an internal failure.Perform the self test again. If the code 2 persists, replace the EIS control module. Refer to Troubleshooting, "Replacing the EIS Control Module". Verify that the original problem is resolved.
STOP
- Code 42 - The self test failed. Reprogramming the parameters may resolve the problem.
Repair: Perform the following procedure:
- Program the EIS control module. Refer to Troubleshooting, "Replacing the EIS Control Module".
- Perform the self test again. If the EIS control module will not pass the self test after reprogramming, replace the EIS control module. Refer to Troubleshooting, "Replacing the EIS Control Module".
STOP
- Code 50 - The self test failed.
Repair: The fault may have been caused by a delay in connecting connector "B" to connector "C". Alternatively, the EIS control module may have an internal failure.Perform the self test again. If the code 50 persists, replace the EIS control module. Refer to Troubleshooting, "Replacing the EIS Control Module". Verify that the original problem is resolved.
STOP