Landfill Compactors, Soil Compactors, Wheel Dozers, and Wheel Loaders VIMSTM 3G Caterpillar


Data Link - Test

Usage:

826K 232


Illustration 1g03672523
Data link connections of models:
834K, 836K and 988


Illustration 2g03672446
Data link connections of models:
966M, 966M XE, 972M, 972M XE, 980M and 982M 950M

The following is a list of codes associated with the machine data link.

Table 1
Communication Gateway #1 ECM (VIMSTM Main) ECM
(MID 161) 
DTC (1)  DTC Description  System Response 
296-9  Transmission Control - Abnormal Update Rate  There is a lack of communication between VIMS and the Transmission ECM. 
590-9  Engine Control Module - Abnormal Update Rate  There is a lack of communication between VIMS and the Engine ECM. 
596-9  Implement Control - Abnormal Update Rate  There is a lack of communication between VIMS and the Implement ECM. 
890-9  Telemetry Data Link - Abnormal Update Rate  There is a lack of communication between VIMS and the telemetry components.  
1250-9  Remote Communication Module - Abnormal Update Rate  There is a lack of communication between VIMS and the remote communication components. 
2448-9  Graphical Display Module: Abnormal Update Rate  There is a lack of communication between VIMS and the graphical display module. 
(1) DTCs are shown as CID-FMI

Each data link circuit:

  • Is an input and output of select electronic control modules (ECMs)

  • Is designed to carry communications between the ECMs

  • Consists of internal control circuits and the connecting harness wiring

Possible -9 DTC causes are:

  • Poor ECM connections on the data link

  • Incorrect ECM hardware or software part numbers

  • Failed data link harness

  • Failed ECM on the data link

  • Failed component on the data link

Table 2
Troubleshooting Steps  Values  Results 

1. Check for Diagnostic Codes

A. Connect Cat® Electronic Technician (Cat ET) to the machine.

B. Check for active DTCs. 

There are no active data link associated codes 

OK - There are no active data link associated DTCs.

STOP

Not OK - There are active data link associated DTCs.

Go to Step 2. 

2. Check Connectors

A. Inspect the circuit harness connectors. 

Connectors are:
* Clean
* Secure
* In good condition 

OK - Connectors are OK.

Go to Step 3.

Not OK - Connectors are not OK.

Repair:

A. Correct any connection problem.

B. Verify that the problem is corrected.

STOP 

3. Check the Hardware Part Numbers and the Software Versions

A. On Cat ET, click "ECM Summary".

B. Check "Software Group" for info(1)

*Hardware is the correct part number

*Software is the latest version 

OK - The hardware and software are correct.

Go to Step 4.

NOT OK - The hardware or software are not correct.

Repair:

A. Install correct part number ECMs, if necessary(2).

B. Update the software(3).

C. Clear the DTC.

STOP 

4. Check For Short to Ground

A. Turn off the disconnect switch.

B. Disconnect all DTC associated ECMs and components from the data link.

C. At the harness connector for the Communication Gateway # 1 ECM, measure the resistance between frame ground and the following harness contacts:

* +Data Link

* -Data Link  

≥5000Ω 

OK - The resistance is correct.

Go to Step 5.

NOT OK - The resistance is not correct.
There is a short between frame ground and the data link circuit in the harness.

Repair:

Repair or replace the harness.

Go to Step 7. 

5. Check For Short to +Battery

The disconnect switch remains off.
All DTC associated ECMs and components remain disconnected from the harness.

A. At the harness connector for the DTC associated ECMs and components, measure the resistance between the following harness contacts:

* +Battery and +Data Link

* +Battery and -Data Link  

≥5000Ω 

OK - The resistance is correct.

Go to Step 6.

NOT OK - The resistance is not correct.
There is a short between the +battery and the data link circuit in the harness.

Repair:

Repair or replace the harness.

Go to Step 7. 

6. Check For an Open

The disconnect switch remains off.
All DTC associated ECMs and components remain disconnected from the harness.

A. Measure the resistance between the following harness contacts:

* Communication Gateway ECM # 1 +Data Link and the DTC associated ECMs and components +Data Link

* Communication Gateway ECM # 1 -Data Link and the DTC associated ECMs and components -Data Link  

<5Ω 

OK - The resistance is correct. The ECM or component may have failed.

Repair:

A. Component Failure:
Replace the component.
Go to Step 7.

B. ECM Failure:
Contact your Technical Communicator (TC)(2).


NOT OK - The resistance is not correct.
There is an open in the harness.

Repair:

Repair or replace the harness.

Go to Step 7. 

7. Recheck the DTC

A. Reconnect all of the DTC associated ECMs and components.

B. Turn on the disconnect switch and the key start switch.

C. Using Cat ET, check the DTC. 

DTC is not active 

OK - DTC is not active.

STOP

NOT OK - DTC is active.

Repair:

Perform this procedure again.
If the problem is not found, contact your TC.

STOP 
(1) Consult the Business Unit that produces the product for the correct part numbers.
(2) See Testing and Adjusting, "Electronic Control Module (ECM) - Replace".
(3) See Testing and Adjusting, "Electronic Control Module (ECM) - Flash Program".

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