VUE AWD V6-3.5L VIN 4 (2004)
Steps 18-22
The numbers below refer to the step numbers on the diagnostic table.
3. A partial loss of communication in the class 2 serial data circuit uses a different procedure than a total loss of communication of the class 2 serial
data circuit.
5. The following DTCs may be retrieved with a history status. These DTCs are not the cause of the present condition.
-
U1300
-
U1301
7. A State of Health DTC with a history status may be present along with a U1000 with a current status. This indicates that the malfunction occurred
when the ignition was ON.
11. This step will isolate a wiring problem or a module malfunction.
13. This step analyzes the specific branch circuit for a malfunction.
14. An open circuit at this point will cause a loss of communication with the vehicle.
19. If there are no current DTCs that begin with the letter "U", the communication concern has been repaired.
21. The communication concern may have prevented diagnosis of the customer complaint.
Scan Tool Does Not Communicate With Keyword Data Line
SCAN TOOL DOES NOT COMMUNICATE WITH KEYWORD DATA LINE
CIRCUIT DESCRIPTION
The Keyword protocol utilizes a single wire bi-directional data line between the modules and the scan tool. The message structure is a request and
response arrangement. Keyword serial data is used for scan tool diagnostics only. The modules do not exchange data on this circuit.
The following modules are connected to the Keyword serial data circuit:
-
Electronic brake control module (EBCM)
-
Engine control module (ECM)
-
Transmission control module (TCM)
DIAGNOSTIC AIDS
-
If the malfunction is intermittent, check for poor connections at the suspect module. Wiggling the harness wiring may help in locating the fault.
-
Diagnostic trouble codes (DTCs) may be set do to this symptom and during this diagnostic procedure. Complete the diagnostic procedure in order
to ensure all the DTCs are diagnosed and cleared from memory.