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| Illustration 1 | g02153514 |
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Schematic of the data link | |
This diagnostic code is recorded when the VIMS 3G Main ECM receives data from the Engine ECM at the wrong rate.
System Response:
This failure results in events that are logged against the Engine ECM that cannot be explained directly. The VIMS 3G Main ECM cannot communicate with the Engine ECM or the Engine ECM appears to communicate intermittently.
Test Step 1. VERIFY THE HARDWARE AND THE SOFTWARE PART NUMBERS.
- Verify that the following information is correct:
- The part number of the VIMS 3G Main ECM onboard software
- The part number of the flash software for the Engine ECM
- The part number of the VIMS 3G Main ECM
- The part number of the Engine ECM
Note: Consult the Business Unit that produces the product for the correct part numbers of the configuration software.
Expected Result:
All part numbers are correct.
Results:
- OK - All part numbers are correct. Proceed to Test Step 2.
- NOT OK - All part numbers are NOT correct.
Repair: The installed VIMS 3G Main ECM or the Engine ECM has the wrong part number or the incorrect configuration software is installed. Replace the incorrect VIMS 3G Main ECM or the Engine ECM with an ECM that has the correct part number. Refer to Testing and Adjusting, "Electronic Control Module (ECM) - Replace". Flash the correct configuration software. Refer to Testing and Adjusting, "Electronic Control Module (ECM) - Flash Program".
STOP
Test Step 2. INSPECT THE HARNESS CONNECTIONS.
- Turn the disconnect switch OFF.
- Inspect all harness connections that are related to the Cat Data Link. Make sure that the connectors are clean and tight.
- Check the connectors for proper mating. Ensure that all the seals are present and in place.
- Check the harness for signs of damage or abrasion.
- Check the wires at the connector. Ensure that the wires are secured tightly into the connector. Take care not to pull the wire out of the connector.
- Check the exposed wires at the connectors for nicks or signs of abrasion.
- Check for moisture inside the connector.
- Check the connectors for dirty contacts or corroded contacts.
- Check each pin and each socket of the machine harness connectors. Ensure that the contacts are properly installed. The contacts should mate correctly when the two pieces of the connector are placed together.
Expected Result:
The machine harness connectors are tight and free of corrosion.
Results:
- OK - The machine harness connectors are tight and free of corrosion. Proceed to Test Step 3.
- NOT OK - The machine harness connectors are in need of repair.
Repair: Repair the machine harness or replace the machine harness.
STOP
Test Step 3. CHECK FOR SHORTS TO GROUND
- The disconnect switch remains OFF.
- Disconnect all of ECM from the Cat Data Link.
- At the machine harness for the VIMS 3G Main ECM, measure the resistance between frame ground and connector contacts 8 (wire 893-GN(Green)) and 9 (wire 892-BR(Brown)) of the Cat Data Link circuit.
Expected Result:
The resistance is high.
Results:
- OK - The resistance is high. The harness circuit resistance is correct. Proceed to Test Step 4.
- NOT OK - The resistance is low. The machine harness has failed.
Repair: There is a short between frame ground and the Cat Data Link circuit in the machine harness. Repair the machine harness or replace the machine harness.
STOP
Test Step 4. CHECK FOR SHORT TO +BATTERY
- The disconnect switch remains OFF.
- All of the related ECM remain disconnected from the machine harness.
- At the machine harness connector for the Engine ECM, perform the checks that are listed here:
- Measure the resistance between the +Battery connector contact J1-52 (wire 150-RD(Red)) and connector contact J1-8 (wire 893-GN(Green)).
- Measure the resistance between connector contact J1-52 (wire 150-RD(Red)) and connector contact J1-9 (wire 892-BR(Brown)).
Expected Result:
The resistance is high.
Results:
- OK - The harness circuit resistance is correct. Proceed to Test Step 5.
- NOT OK - The resistance is too low. The machine harness has failed.
Repair: There is a short between the +battery and the Cat Data Link circuit in the machine harness. Repair the machine harness or replace the machine harness.
STOP
Test Step 5. CHECK FOR OPEN HARNESS
- The disconnect switch remains OFF.
- Ensure that all of the ECMs are disconnected from the machine harness.
- Check the continuity of the Cat Data Link circuit in the machine harness:
- Measure the resistance between connector contact 8 (wire 893-GN(Green)) of the VIMS 3G Application ECM and connector contact J1-8 (wire 893-GN(Green)) of the Engine ECM.
- Measure the resistance between connector contact 9 (wire 892-BR(Brown)) of the VIMS 3G Application ECM and connector contact J1-9 (wire 892-BR(Brown)) of the Engine ECM.
Expected Result:
The continuity checks good.
Results:
- OK - The continuity checks good. The Cat Data Link circuit in the machine harness is correct. Proceed to Test Step 6.
- NOT OK - The continuity is bad. The machine harness has failed.
Repair: The Cat Data Link circuit is open in the machine harness. Repair the machine harness or replace the machine harness.
STOP
Test Step 6. CHECK FOR ADDITIONAL DIAGNOSTIC CODES FOR THE OTHER ECM.
- Reconnect all of the ECM that use the Cat Data Link.
- Turn the disconnect switch and the key start switch ON.
- Check the Event List for diagnostic codes that are logged against the other ECM.
Expected Result:
Diagnostic codes are not present for the other ECM in the event list.
Results:
- OK - Diagnostic codes are not present for the other ECM in the event list.
Repair: The Engine ECM has failed. The failure of an ECM is unlikely. Exit this procedure. Perform this procedure again. If the failure is not found, replace the Engine ECM.
STOP
- NOT OK - Diagnostic codes are present for the other ECM in the event list.
Repair: Perform the troubleshooting procedure for the other diagnostic codes.
STOP