TERMINALS OF ECM
1. CHECK ECM
HINT:
The standard voltage at each ECM terminal is shown in the table below.
In the table, first follow the information under "Condition". Look under "Terminal No. (Symbol)" for the terminals to inspect. The standard voltage between the terminals is shown under "Specified Condition".
Use the illustration above as a reference for the ECM terminals.
Terminal No. (Symbol) |
Wiring Color |
Terminal Description |
Condition |
Specified Condition |
---|---|---|---|---|
B37-2 (NSW) - B38-12 (E1) |
B - BR |
PNP switch signal |
|
Below 1 V |
|
11 to 14 V |
|||
B36-35 (P) - B38-12 (E1) |
L - BR |
P shift position switch signal |
|
11 to 14 V |
|
Below 1 V |
|||
B36-28 (R) - B38-12 (E1) |
R - BR |
R shift position switch signal |
|
11 to 14 V |
|
Below 1 V |
|||
B36-29 (N) - B38-12 (E1) |
G - BR |
N shift position switch signal |
|
11 to 14 V |
|
Below 1 V |
|||
B36-27 (D) - B38-12 (E1) |
B - BR |
D shift position switch signal |
|
11 to 14 V |
|
Below 1 V |
|||
F50-24 (S) - B38-12 (E1) |
V - BR |
S shift position switch signal |
|
11 to 14 V |
|
Below 1 V |
|||
F50-16 (SFTU) - B38-12 (E1) |
GR - BR |
Up-shift position switch signal |
|
11 to 14 V |
|
Below 1 V |
|||
F50-22 (SFTD) - B38-12 (E1) |
LG - BR |
Down-shift position switch signal |
|
11 to 14 V |
|
Below 1 V |
|||
B37-36 (S1) - B38-12 (E1) |
L-R - BR |
S1 solenoid signal |
Ignition switch ON |
11 to 14 V |
1st or 2nd gear |
11 to 14 V |
|||
3rd, 4th or 5th gear |
Below 1 V |
|||
B36-33 (S2) - B38-12 (E1) |
L-W - BR |
S2 solenoid signal |
Ignition switch ON |
Below 1 V |
2nd or 3rd gear |
11 to 14 V |
|||
1st, 4th or 5th gear |
Below 1 V |
|||
B36-31 (SR) - B38-12 (E1) |
G-W - BR |
SR solenoid signal |
Ignition switch ON |
Below 1 V |
5th gear |
11 to 14 V |
|||
1st gear |
Below 1 V |
|||
B38-33 (SL1+) - B38-32 (SL1-) |
V - R-B |
SL1 solenoid signal |
Engine idling |
Pulse generation (See waveform 1) |
B37-31 (SL2+) - B38-34 (SL2-) |
LG - P-L |
SL2 solenoid signal |
Engine idling |
Pulse generation (See waveform 2) |
B37-34 (SLT+) - B37-35 (SLT-) |
G-Y - L-B |
SLT solenoid signal |
Engine idling |
Pulse generation (See waveform 3) |
B37-33 (SLU+) - B37-32 (SLU-) |
G-R - Y-R |
SLU solenoid signal |
4th gear (lock-up) or 5th gear (lock-up) |
Pulse generation (See waveform 4) |
B38-5 (THO1) - B37-8 (ETHW) |
B-R - W-R |
No. 1 ATF temperature sensor signal |
No. 1 ATF temperature 115°C (239°F) or higher |
Below 1.5 V |
B38-11 (THO2) - B37-8 (ETHW) |
L-Y - W-R |
No. 2 ATF temperature sensor signal |
No. 2 ATF temperature 115°C (239°F) or higher |
Below 1.5 V |
B38-9 (SP2+) - B38-10 (SP2-) |
G - R |
Speed sensor SP2 signal |
Vehicle speed 20 km/h (12 mph) |
Pulse generation (See waveform 5) |
B38-3 (NT+) - B38-4 (NT-) |
B - Y |
Speed sensor NT signal |
Engine idling (shift lever in P or N) |
Pulse generation (See waveform 6) |
F50-32 (CANH) - B38-12 (E1) |
V - BR |
CAN communication line |
Ignition switch ON |
Pulse generation (See waveform 7) |
F50-31 (CANL) - B38-12 (E1) |
W - BR |
CAN communication line |
Ignition switch ON |
Pulse generation (See waveform 8) |
(a) Using an oscilloscope, check waveform 1.
Reference
Terminal No. (Symbol) |
Tool Setting |
Condition |
---|---|---|
B38-33 (SL1+) - B38-32 (SL1-) |
5 V/DIV., 1 msec./DIV. |
Engine idling |
(b) Using an oscilloscope, check waveform 2.
Reference
Terminal No. (Symbol) |
Tool Setting |
Condition |
---|---|---|
B37-31 (SL2+) - B38-34 (SL2-) |
5 V/DIV., 1 msec./DIV. |
Engine idling |
(c) Using an oscilloscope, check waveform 3.
Reference
Terminal No. (Symbol) |
Tool Setting |
Condition |
---|---|---|
B37-34 (SLT+) - B37-35 (SLT-) |
5 V/DIV., 1 msec./DIV. |
Engine idling |
(d) Using an oscilloscope, check waveform 4.
Reference
Terminal No. (Symbol) |
Tool Setting |
Condition |
---|---|---|
B37-33 (SLU+) - B37-32 (SLU-) |
5 V/DIV., 1 msec./DIV. |
4th gear (lock-up) or 5th gear (lock-up) |
(e) Using an oscilloscope, check waveform 5.
Reference
Terminal No. (Symbol) |
Tool Setting |
Condition |
---|---|---|
B38-9 (SP2+) - B38-10 (SP2-) |
2 V/DIV., 20 msec./DIV. |
Vehicle speed 20 km/h (12 mph) |
(f) Using an oscilloscope, check waveform 6.
Reference
Terminal No. (Symbol) |
Tool Setting |
Condition |
---|---|---|
B38-3 (NT+) - B38-4 (NT-) |
1 V/DIV., 2 msec./DIV. |
Engine idling (shift lever in P or N) |
(g) Using an oscilloscope, check waveform 7.
Reference
Terminal No. (Symbol) |
Tool Setting |
Condition |
---|---|---|
F50-32 (CANH) - B38-12 (E1) |
1 V/DIV., 10 μsec./DIV. |
Ignition switch ON |
(h) Using an oscilloscope, check waveform 8.
Reference
Terminal No. (Symbol) |
Tool Setting |
Condition |
---|---|---|
F50-31 (CANL) - B38-12 (E1) |
1 V/DIV., 10 μsec./DIV. |
Ignition switch ON |
Pressure Sensor or Switch (C1254)
DESCRIPTION
The accumulator pressure sensor is connected to the skid control ECU in the master
cylinder solenoid.
DTC Code
DTC Detection Condition
Trouble Area
C1254
There is an accumulator pre ...
Acceleration Sensor Stuck Malfunction (C1232,C1243,C1245,C1279)
DESCRIPTION
The skid control ECU receives signals from the yaw rate and acceleration sensor
via the CAN communication system.
If there is trouble in the bus lines between the yaw rate and acceleration sensor
and the CAN communication system, DTCs U0123 ( ...