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 |
Engine Coolant Temperature Circuit Range / Performance Problem (P0116)
DESCRIPTION
Refer to DTC P0115 (See page ).
DTC No.
DTC Detection Condition
Trouble Area
P0116
When either of the following conditions is met (2 trip detection logic).
During engine ...
Black Screen
PROCEDURE
1.
CHECK DISPLAY SETTING
(a) Check that the display is not in screen off mode.
OK:
The display setting is not in screen off mode.
NG
CHANGE SCREEN TO SCREEN ON MODE
...
Short in Driver Side Knee Airbag Squib Circuit (B1860/64-B1863/64)
DESCRIPTION
The driver side knee airbag squib circuit consists of the center airbag sensor
assembly and driver side knee airbag assembly.
The center airbag sensor assembly uses this circuit to deploy the airbag when
deployment conditions are met.
These ...