0334438 JOHNSON KNOB

Table 1
J1939 Code and Description Comments
51-9
Engine Throttle Position : Abnormal Update Rate The ECM is not communicating properly with the throttle actuator over the CAN data link.
The code is logged.
898-9
Engine Requested Speed/Speed Limit : Abnormal Update Rate The "Desired Speed Input Configuration" must be set to "CAN" for the code to be set.
The ECM is not communicating properly with the EMCP over the CAN data link.
The code is logged.
1442-9
Engine Fuel Valve #1 Position : Abnormal Update Rate The ECM is not communicating properly with the fuel metering valve.
The code is logged.
2452-9
Generator Total Real Power : Abnormal Update Rate The ECM is not receiving generator power sensor information from the EMCP.
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.
3470-9
Engine Turbocharger Compressor Control : Abnormal Update Rate The ECM is not communicating properly with the compressor bypass control over the CAN data link.
The code is logged.
3542-9
Requested Engine Control Mode : Abnormal Update Rate The "Engine State Control Input Configuration" must be set to "CAN" for the code to be set.
The ECM is not communicating properly with the EMCP over the CAN data link.
The code is logged. If the Cat® Electronic Technician (Cat ET) Service Tool 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.-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 resistors
Illustration 1 g06494551
For the complete circuit details, refer to the full schematic.
Illustration 2 g06494511
For the complete circuit details, refer to the full schematic.
Table 2
Troubleshooting Test Steps Values Results
1. Check for Codes
A. Connect the Cat® Electronic Technician (Cat ET) Service Tool 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 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 3.
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 4.
3. 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 4.
Result: The resistance is 60 10 Ohms. The termination resistors are OK.
Proceed to Test Step 4.
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 4.
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 4.
4. 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.
Result: A -9 diagnostic is still active and communication problems continue. There may be a problem with one of the communicating devices. If multiple devices show an active-9 diagnostic, and the wiring is correct, you may have a problem with the ECM. If only one device is showing an active -9 diagnostic, that specific device may have a problem. Contact your dealer TC for further assistance.
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).