0177001 JOHNSON FUEL TANK

Table 1
Diagnostic Trouble Codes for the CAN Data Link Circuit
J1939 Code CDL Code Code Description Comments
639-9 247-9 J1939 Network #1 : Abnormal Update Rate Another controller has incorrectly stopped transmitting a J1939 speed request (TSC1) or another controller has incorrectly started transmitting a J1939 speed request.
The ECM will log the diagnostic code.
The engine will not start.
1196-2 1639-2 Anti-theft Component Status States : Erratic, Intermittent, or Incorrect The Electronic Control Module (ECM) detects poor communications with the Machine Security System (MSS).
The engine warning lamp will come on and the ECM will log the diagnostic code.
The engine will not start.
1196-9 1639-9 Anti-theft Component Status States : Abnormal Update Rate The Electronic Control Module (ECM) detects a loss of communications with the Machine Security System (MSS).
The warning lamp will come on and the ECM will log the diagnostic code.
The engine will not start.
1231-9 2348-9 J1939 Network #2 : Abnormal Update Rate An OEM unit has incorrectly stopped transmitting data or the soot sensor has incorrectly started transmitting a data request.
The ECM will log the diagnostic code.
The engine will not start.
1235-9 5856-9 J1939 Network #3 : Abnormal Update Rate The Pump, Electronics, and Tank Unit (PETU), the soot sensor, or a NOx sensor has incorrectly stopped or started transmitting a data request.
The ECM will log the diagnostic code.
- 1603-9 Machine Control Module : Abnormal Update Rate The machine ECM has incorrectly stopped or started transmitting a data request.
The engine ECM will log the diagnostic code.
The engine will not start. The following background information is related to this procedure:The CAN data links are also known as J1939 data links. A data link is an industry standard for sending data between different devices in the same application.High-speed data is transferred via the data links. The data links cannot be accurately tested without complicated equipment. The data links require a resistance of 60 Ohms between the two wires to transmit the data correctly. This resistance is made up of two 120 Ohm resistors. The two resistors are known as "Terminating Resistors". The terminating resistors should be at opposite ends of a data link circuit. If this resistance is not present, then the data will be intermittent or unreadable.Note: The wiring for a J1939 data link is a shielded twisted-pair cable. If the wiring is damaged, the replacement type must be shielded twisted-pair cable.-9 Detected Problems:ECM 1 is unable to communicate on the data link.
ECM 1 cannot communicate with other ECM's on the data link, but can communicate with the service tool. This situation indicates a problem with the data link wiring.ECM 1 is unable to communicate with ECM 2 on the data link.
ECM 1 cannot communicate with ECM 2, indicating a problem with the data link wiring, power or ground circuit, or ECM 2.
Illustration 1 g06564493
Typical example of the schematic for the CAN A data link
Illustration 2 g03810547
Typical example of the schematic for the CAN B data link
Illustration 3 g06316349
Typical example of the schematic for the CAN C data link
Illustration 4 g03132596
Typical view of the pin locations on the P1 connector
(13) CAN B+
(17) CAN C+
(18) CAN C-
(21) CAN B-
(25) CAN A+
(26) CAN A-
Illustration 5 g03132736
Typical view of the pin locations on the P2 connector
(23) CAN A+
(31) CAN A-Complete the procedure in the order in which the steps are listed.
Table 2
Troubleshooting Test Steps Values Results
1. Check for Associated Diagnostic Trouble Codes
A. Establish communication between the electronic service tool and the ECM. Refer to Troubleshooting, "Electronic Service Tools", if necessary.
B. Download the "Warranty Report" from the engine ECM before performing any troubleshooting or clearing diagnostic trouble codes.
Troubleshoot any associated diagnostic codes that are present before continuing with this procedure.
Associated Codes
Result: Another diagnostic trouble code is not active or logged.
Proceed to Test Step 2.
Result: Another code is active or logged.
Repair: Troubleshoot the other codes before continuing with this procedure.
Refer to Troubleshooting, "Diagnostic Trouble Codes" to troubleshoot the other diagnostic code.
2. Use the "System Communication Status" to Determine the Communication Issue
A. In the electronic service tool, click the "Diagnostics" tab on the tool bar.
B. Select the "System Communication Status" option from the drop-down list.
Note: The Aftertreatment #1 Intake NOx Level Sensor is displayed as Aftertreatment #1 Information #1 in some versions of software.
Component Identified
Result: A -9 or -2 code is active.
Repair: Refer to the above -9 detected problems for more information.
Proceed to Test Step 3.
3. Use the System Communication Status to Determine the Cause
A. Determine if both ECM 1 and ECM 2 are present in the "ECM's" column (1) within the "System Communication Status" screen.
Note: The Aftertreatment #1 Intake NOx Level Sensor is displayed as Aftertreatment #1 Information #1 in some versions of software.
Component Identified
Result: ECM 1 and ECM 2 are both present.
Record the devices identified as ECM 1 and ECM 2 in column 1.
Proceed to Test Step 4.
Result: Only ECM