881421T02 Mercury POWERHEAD ASSEMBLY

Table 1
Diagnostic Trouble Codes for the CAN Data Link
J1939 Code and Description Notes
639-9
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.
639-14
J1939 Network #1 : Special Instruction Communication has not been lost to one or more devices on the datalink, however the affected Electronic Control Module (ECM) is missing expected parameters. If no programming issues exist, there is likely a problem with the data link wiring, power, or ground circuits. The following background information is related to this procedure:The CAN data link is also known as J1939 data link. The data link is an industry standard for sending data between different devices in the same application.High-speed data is transferred via the data link. The data link cannot be accurately tested without complicated equipment. The data link requires a resistance of 60 Ohms between the two wires in order 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 the J1939 data link is a shielded twisted-pair cable. If the wiring is damaged, the replacement type must be shielded twisted-pair cable.
Illustration 1 g06203933
Typical example of the schematic for the CAN 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. Look for active codes that are associated with the system for the diagnostic code.
Codes
Result: An associated code is active.
Repair: Troubleshoot any associated codes before continuing with this test.
Result: An associated diagnostic trouble code is not active or logged.
Proceed to Test Step 2.
2. Use the "System Communication Status" to Determine the Communication Issue
A. In Cat ET, click the "Diagnostics" tab on the tool bar.
B. Select the "System Communication Status" option from the drop-down list.
Component Identified
Result: A -9 code is active. Refer to the above -9 detected problems for additional information.
Proceed to Test Step 5.
Result: A -14 code is active. Refer to the above -14 detected problems for additional information.
Proceed to Test Step 3.
3. Check for Incorrect Configuration Parameters
A. Connect Cat ET.
B. Use Cat ET to verify that the correct parameters are being used.
Parameters
Result: The parameters are correct.
Proceed to Test Step 4.
Result: The parameters are not correct.
Repair: Input the correct parameters. Refer to Troubleshooting, "Configuration Parameters" for additional information.
If the problem is not resolved, proceed to Test Step 4.
4. 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.
Flash File
Result: The latest flash file is installed.
Proceed to Test Step 9.
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.
Proceed to Test Step 9.
Illustration 2 g03846524
Device 1 present
(1) Column 1
Illustration 3 g03846007
Device 1 and Device 2 present
(1) Column 1
(2) Multiple Device 1 and Device 2 can be displayed
(3) Device 2 is the affected ECM/device that cannot be recognized by Device 1. Device 2 is the ECM/device with the problem.
Table 3
Troubleshooting Test Steps Values Results
5. Use the System Communication Status to Determine the Cause
A. Determine if both Device 1 and Device 2 are present in the "ECM's" column (1) within the "System Communication Status" screen. Refer to Illustration 3.
Component Identified
Result: Device 1 and Device 2 are both present.
Record the devices identified as Device 1 and Device 2 in column 1. Refer to Illustration 3.
Proceed to Test Step 6.
Result: Only Device 1 is present.
Record the device identified as Device 1 in column 1. Refer to Illustration 2.
Proceed to Test Step 8.
6. Check the Resistance of the Data link
A. Turn the breaker to the OFF position.
B. Measure the resistance of the data link between the following Device 2 wiring harness connector terminals:
- +Data link and -Data link
60+/-10 Ohms
Result: The resistance is less than 50 Ohms.
Repair: There are more than 2 terminating resistors installed in the wiring harness or a short circuit has been detected. Repair or replace damaged components.
Proceed to Test Step 9.
Result: The resistance is 120 10 Ohms.
Repair: There is a problem with a terminating resistor. Check the resistance on each terminating resistor. Replace the failed terminating resistor.
Proceed to Test Step 9.
Result: The resistance is greater than 130 Ohms.
Repair: There is a problem with both terminating resistors or an open circuit has been detected.
Determine the cause of the problem. Repair or replace damaged components.
Proceed to Test Step 9.
Result: The resistance is 60 10 Ohms. The terminating resistors are OK.
Proceed to Test Step 7.
7. Check the Power and Ground to Device 2
A. Turn the breaker to the ON position.
B. Measure the voltage between the following Device 2 wiring harness connector terminals:
- +Battery and -Battery
Battery Voltage
Result: The voltage is not equal to battery voltage.
Repair: There is an open or short in the wiring circuit. Repair or replace the wiring circuit. Refer to the schematic for wiring information.
Proceed to Test Step 9.
Result: The voltage is equal to battery voltage.
Repair: Replace the component identified as Device 2.
Proceed to Test Step 9.
8. Check the Resistance of the Data Link
A. Turn the breaker to the OFF position.
B. Measure the resistance of the data link between the following Device 1 wiring harness connector termi