G3600 A4 Engines Data Link - Test Caterpillar


Data Link - Test
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Use this procedure to troubleshoot a problem with the data link. Also, use this procedure if one of following diagnostic codes is active or easily repeated.

Table 1
J1939 Code and Description  Comments 
843-9
Operator Control Panel : Abnormal Update Rate 
The Electronic Control Module (ECM) is not communicating properly with the Operator Control Panel (OCP) over the CAN data link.
The code is logged. 
898-9
Engine Requested Speed/Speed Limit : Abnormal Update Rate 
The ECM is not communicating properly with the OCP over the CAN data link. This code will be present when the desired speed input is set to CAN and communication is lost.
The code is logged. 
1442-9
Engine Fuel Valve #1 Position : Abnormal Update Rate 
The ECM is not communicating with the fuel valve.
The code is logged. 
2241-9
Source Address 241 : Abnormal Update Rate(1) 
The ECM is not communicating with the ISM.
The code is logged. 
3216-9
Aftertreatment #1 NOx : Abnormal Update Rate 
The ECM is not communicating properly with the NOx sensor.
The code is logged. 
3542-9
Requested Engine Control Mode : Abnormal Update Rate 
The ECM is not communicating properly with the OCP over the CAN data link. This code will be present when the engine operating state input is set to CAN input and communication is lost.
The code is logged. 
5418-9
Engine Fuel Actuator #1 : Abnormal Update Rate 
The ECM is not communicating properly with the fuel metering valve over the CAN data link.
The code is logged. 
(1) Integrated Sensing Module (ISM) data link

If Cat® Electronic Technician (ET) will not communicate with the ECM, refer to Troubleshooting, "Electronic Service Tool Does Not Communicate" before you begin this procedure. The procedure will verify that electrical power is being supplied to the ECM and to the service tool connector.

The data links are used to communicate information between the engine ECM and other control modules that are a part of the application. Cat ET also communicates with the ECM via the data links.

The service tool connector contains connections for electrical power and for the data links.

Cat ET may display the following error message:

"The version of the ECM is not recognized and the integrity of the changed parameters and displayed data is not guaranteed."

This message indicates one of the following conditions:

  • The flash file in the ECM is newer than the version of Cat ET.

  • The latest version of Cat ET has not been installed.


Illustration 1g03792165

-9 Detected Problems

  • An invalid configuration parameter

  • Software incompatibility between two or more ECM's on the network

  • Hardware incompatibility between CAN-based system components

  • Damaged CAN data link wiring

  • Missing or damage terminating resistor(s)

-14 Detected Problems

  • Incorrect personality module code

  • An invalid configuration parameter

  • Software Incompatibility between two or more ECM's on the network

  • Hardware Incompatibility between CAN-based system components, incorrect module, or display on the data link

Table 2
Troubleshooting Test Steps  Values  Results 

1. Check for Codes

A. Connect Cat® Electronic Technician (ET) to the service tool connector.

B. Determine if a code is active or logged.
 

Codes
 

Result: A -9 code is active or logged.

Proceed to Test Step 2.
 

2. Check the Part Number of the Affected Component

A. Verify that the part number of the affected component is the correct part number for the application.
 

Part Number
 

Result: The part number is correct for the application.

Proceed to Test Step 3.

Result: The part number is not correct for the application.

Repair: Replace the affected component with the correct part number for the application.

Proceed to Test Step 6.
 

3. Ensure that the latest Flash File Software is Installed in the ECM

A. Connect Cat ET.

B. Use Cat ET to verify that the correct flash file is being used.

Note: Some devices on the data link may not be reflashed. If the device cannot be reflashed, the device must be replaced.
 

Flash File
 

Result: The latest flash file is installed.

Proceed to Test Step 6.

Result: The latest flash file is not installed.

Repair: Perform the following procedure:

1. Download the latest flash file from SIS Web.

2. Install the software into the ECM.

Refer to Troubleshooting, "ECM Software - Install" for additional information.

If the problem is not resolved, proceed to Test Step 6.
 

4. Check for Battery Voltage at the Affected Component

A. Turn the power to the ON position.

B. Measure the voltage between the following terminals on the wiring harness connector for the affected component:

- Battery (+) and Battery (-)
 

Battery Voltage 

Result: There was battery voltage between the battery (+) and battery (-) terminals at the wiring harness connector.

Proceed to Test Step 5.

Result: There was not battery voltage between the battery (+) and battery (-) terminals at the wiring harness connector. There is an open or a short in the wiring harness.

Repair: Repair or replace the wiring harness.

Proceed to Test Step 6.
 

5. Check the Termination Resistors for the J1939 Data Link

A. Turn the main disconnect switch to the OFF position.

B. At the affected component, measure the resistance between the following CAN data link terminals:

- CAN (+) and CAN (-)
 

60 ± 10 Ohms
 

Result: The resistance is less than 50 Ohms. There are more than 2 termination resistors installed in the wiring harness or a short circuit has been detected.

Repair: Repair or replace damaged components.

Proceed to Test Step 6.

Result: The resistance is 60 ± 10 Ohms. The termination resistors are OK.

Proceed to Test Step 6.

Result: The resistance is approximately 120 ± 10 Ohms. There is a problem with a termination resistor or a termination resistor is missing.

Repair: Check the resistance on each terminating resistor. Replace the failed termination resistor.

Proceed to Test Step 6.

Result: The resistance is greater than 130 ohms. There is a problem with the wiring harness between the ECM and the next connection point in the data link wiring.

Repair: Repair or replace the wiring harness.

Proceed to Test Step 6.
 

6. Check for Active CAN Communication

A. Connect Cat ET.

B. Use Cat ET to monitor the following:

- Codes
 

Codes
 

Result: A code is not active.

Return to service.
 

If the procedure did not correct the issue, contact your Cat dealer Technical Communicator (TC). For further assistance, your TC can confer with the Dealer Solutions Network (DSN).

Information System: