DESCRIPTION
The engine control unit communicates with the TCM using the Controller Area Network (CAN).
If there is a problem in this communication, the TCM sets a DTC.
DTC No. |
DTC Detection Condition |
Trouble Area |
---|---|---|
U0100 |
Following conditions are met for 1.25 seconds (1 trip detection logic):
|
|
MONITOR STRATEGY
Related DTCs |
U0100: Verify communication |
Required Sensors/Components (Main) |
TCM |
Required Sensors/Components (Related) |
- |
Frequency of Operation |
Continuous |
Duration |
1.25 seconds |
MIL Operation |
Immediate |
Sequence of Operation |
None |
TYPICAL ENABLING CONDITIONS
Monitor runs whenever following DTCs not present |
None |
Battery Voltage |
10.5 V or more |
Ignition Switch |
ON |
Starter |
OFF |
TYPICAL MALFUNCTION THRESHOLDS
Communication between TCM and ECM |
No communication |
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
Perform the universal trip to clear permanent DTCs (See page
).
HINT:
PROCEDURE
1. |
CHECK ECU TERMINAL VOLTAGE (+B AND E1 TERMINALS) |
(a) Disconnect the TCM connector. |
|
(b) Turn the ignition switch to ON.
(c) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection |
Switch Condition |
Specified Condition |
---|---|---|
B40-18 (+B) - B40-8 (E1) |
Ignition switch ON |
9 to 14 V |
(d) Turn the ignition switch off.
(e) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
B40-8 (E1) - Body ground |
Always |
Below 1 Ω |
*1 |
Front view of wire harness connector (to TCM) |
NG | ![]() |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
2. |
CHECK HARNESS AND CONNECTOR (TCM - ECM) |
(a) Disconnect the TCM connector. |
|
(b) Disconnect the ECM connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
B40-6 (CAN+) - B39-24 (CAN+) |
Always |
Below 1 Ω |
B40-7 (CAN-) - B39-1 (CAN-) |
Always |
Below 1 Ω |
B40-6 (CAN+) or B39-24 (CAN+) - Body ground or other terminals |
Always |
1 MΩ or higher |
B40-7 (CAN-) or B39-1 (CAN-) - Body ground or other terminals |
Always |
1 MΩ or higher |
*1 |
Front view of wire harness connector (to ECM) |
*2 |
Front view of wire harness connector (to TCM) |
NG | ![]() |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
3. |
CHECK IF DTC OUTPUT RECURS |
(a) Connect the Techstream to the DLC3.
(b) Clear the DTCs.
(c) Replace the TCM.
HINT:
Replace the TCM with a TCM from a normally functioning vehicle of the same model.
(d) Start the engine.
(e) Read the DTCs.
Display (DTC Output) |
Proceed to |
---|---|
U0100 |
A |
No DTC |
B |
A | ![]() |
REPLACE ECM |
B | ![]() |
REPLACE TCM |
Removal
REMOVAL
PROCEDURE
1. REMOVE FRONT SEAT ASSEMBLY LH
(See page )
2. REMOVE FRONT DOOR SCUFF PLATE LH
3. REMOVE COWL SIDE TRIM SUB-ASSEMBLY LH
4. REMOVE FRONT DOOR OPENING TRIM WEATHERSTRIP LH
5. REMOVE REAR DOOR SCUFF PLATE LH
6. REMOVE REAR ...
Control Module Communication Bus OFF (U0073/86,U0100/85,U0129/83)
DESCRIPTION
The AWD control ECU inputs the signals sent from the ECM and skid control
ECU via the CAN communication system.
When DTCs indicating a CAN communication system malfunction are output,
repair the CAN communication system before r ...
Sleep Operation Failure of Occupant Classification ECU (B1796)
DESCRIPTION
In sleep mode, the occupant classification ECU reads the condition of each sensor
while the ignition switch is off.
In this mode, if occupant classification ECU detects an internal malfunction,
DTC B1796 is output.
DTC No.
...