Dtc U2105-U2199 (Except U2142 And U2143) - Suzuki XL7 2007 Service Manual

Circuit Description
The GMLAN serial data circuits are controller area
network (CAN) serial data buses used to communicate
information between the control modules. Typical data
transmission speeds must be high enough to ensure that
a required real-time response is maintained. On this
vehicle there are 2 totally different types of GMLAN
serial data circuits, the high speed 2-wire circuit and low
speed single wire circuit. Refer to "Data Link
Communications Description and Operation" for the
complete description of these buses. The GMLAN serial
data circuits also communicate directly to the DLC
connector. Messages are interpreted by the externally
connected CANdi module which acts as a transceiver for
the scan tool.
Modules connected to the GMLAN serial data circuits
monitor communications during normal vehicle
operation, where operation information is exchanged
among the modules. All the modules on the GMLAN
networks, maintain a transmit error counter (TEC) and a
receive error counter (REC). The counter values
increase with detected errors and will decrease with
error-free messages. If the TEC value exceeds 255, the
controller removes itself from the network and DTC
U2100 will result.
Conditions for Running the DTCs
• Supply voltage to the modules are in the normal
operating range.
• The vehicle is in the RUN power mode.

DTC U2105-U2199 (Except U2142 and U2143)

Diagnostic Instructions
• Perform the "Diagnostic System Check - Vehicle Diagnostic Information: " prior to using this diagnostic procedure.
• Review "Strategy Based Diagnosis: " for an overview of the diagnostic approach.
• "Diagnostic Procedure Instructions - Vehicle Diagnostic Information: " provides an overview of each diagnostic
category.
DTC Descriptors
DTC U2105 00: Lost Communication With Engine Control System
DTC U2106 00: Lost Communications With Transmission Control System
DTC U2107 00: Lost Communications With Body Control System
Diagnostic Fault Information
Circuit
Module Voltage Circuits (input or output)
Module Ground Circuits
Conditions for Setting the DTC
The module setting the DTC has attempted to establish
communications on the GMLAN circuits for more than 7
times.
Action Taken When the DTCs Sets
• The module suspends all message transmission.
• The module uses default values for all parameters
received on the serial data circuits.
• The module inhibits the setting of all other
communication DTCs.
Conditions for Clearing the DTC
• A current DTC clears when the malfunction is no
longer present.
• A history DTC clears when the module ignition cycle
counter reaches the reset threshold of 50, without a
repeat of the malfunction.
Diagnostic Aids
• This DTC cannot be retrieved with a current status.
Diagnosis of a current DTC is accomplished via the
symptom, Scan Tool Does Not Communicate with
High Speed GMLAN Device, or Scan Tool Does Not
Communicate with Low Speed GMLAN Device
depending on the module serial data communication.
• An intermittent condition is likely to be caused by a
short on the GMLAN serial data circuits. Use the Scan
Tool Does Not Communicate with High Speed
GMLAN Device, or Scan Tool Does Not Communicate
with Low Speed GMLAN Device procedure in order to
isolate an intermittent condition.
Short to Open/High
Ground Resistance
U2105-U2199 U2105-U2199
Except U2142 Except U2142
and U2143 and U2143
U2105-U2199
— Except U2142
and U2143
Data Communications:
Signal
Short to Voltage
Performance
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10B-27
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