G3400 Engines (EIS) Caterpillar

Control Module Self Test

Usage:

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 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.

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Illustration 1	g01157197
Configuration of the harnesses for self test

Connect the harnesses. Refer to Illustration 1.
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:
1. Verify that the harnesses are configured correctly.
1. Verify that the electronic service tool is receiving electrical power. Refer to Troubleshooting, "Electrical Power Supply".
1. 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".

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

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".

Disconnect connector "A" from connector "C".

Note: Wait for three seconds after connector "B" is connected to connector "C". Test B will begin automatically.

Connect connector "B" to connector "C".

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:
1. Set the engine control to the "OFF/RESET" mode.
1. Remove the electrical power from the engine.
1. Disconnect the test harness from the EIS control module.
1. Connect the engine harness to the EIS control module.
1. Restore the electrical power to the engine.
1. 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.

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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	Refer to "Results:" for this procedure.

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:
1. Program the EIS control module. Refer to Troubleshooting, "Replacing the EIS Control Module".
1. 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