TERMINALS OF ECU
1. CHECK 4WD CONTROL ECU
(a) Measure the voltage and resistance according to the value(s) in the table below.
Terminal No. (Symbol) |
Wiring Color |
Terminal Description |
Condition |
Specified Condition |
---|---|---|---|---|
F47-2 (4WDL) - F46-4 (GND) |
L - W-B |
Transfer indicator switch (L4 position) |
Ignition switch ON Transfer shift lever position H2 or H4 |
10.5 to 14 V |
Ignition switch ON Transfer shift lever position L4 or N |
Below 1.5 V |
|||
F47-3 (4WD) - F46-4 (GND) |
B - W-B |
Transfer indicator switch (4WD position) |
Ignition switch ON Transfer shift lever position H2 |
10.5 to 14 V |
Ignition switch ON Transfer shift lever position H4, L4 or N |
Below 1.5 V |
|||
F47-9 (DL1) - F46-4 (GND) |
LG - W-B |
A.D.D. actuator limit switch |
Ignition switch ON Transfer shift lever position H2 |
Below 1.5 V |
Ignition switch ON Transfer shift lever position H4, L4 or N |
10.5 to 14 V |
|||
F47-10 (DL2) - F46-4 (GND) |
GR - W-B |
A.D.D. actuator limit switch |
Ignition switch ON Transfer shift lever position H2 |
10.5 to 14 V |
Ignition switch ON Transfer shift lever position H4, L4 or N |
Below 1.5 V |
|||
F47-15 (ADD) - F46-4 (GND) |
W - W-B |
A.D.D. detection switch |
Ignition switch ON Transfer shift lever position H2 |
9.5 to 14 V |
Ignition switch ON Transfer shift lever position H4, L4 or N |
Below 1.5 V |
|||
F47-16 (NP) - F46-4 (GND) |
R - W-B |
Transfer indicator switch (Neutral position) |
Ignition switch ON Transfer shift lever position N |
Below 1.5 V |
Ignition switch ON Transfer shift lever position not N |
10.5 to 14 V |
|||
F47-19 (CANH) - F46-4 (GND) |
G - W-B |
CAN communication line |
Ignition switch ON |
Pulse generation (See waveform 1) |
F47-20 (CANL) - F46-4 (GND) |
W - W-B |
CAN communication line |
Ignition switch ON |
Pulse generation (See waveform 2) |
F47-21 (L4) - F46-4 (GND) |
R - W-B |
Transfer L4 signal |
Ignition switch ON Transfer shift lever position H2 or H4 |
10 to 14 V |
Ignition switch ON Transfer shift lever position L4 or N |
Below 1.5 V |
|||
F46-1 (DM1) - F46-4 (GND) |
B - W-B |
A.D.D. actuator motor |
Ignition switch ON Transfer shift lever position H2 → H4, L4 or N (During operation of A.D.D. actuator motor from FREE to LOCK) |
10 to 14 V |
Ignition switch ON Transfer shift lever position H2 → H4, L4 or N (A.D.D. actuator motor stopped) |
Below 1.5 V |
|||
F46-3 (IG) - F46-4 (GND) |
R - W-B |
IG power |
Ignition switch ON |
11 to 14 V |
F46-4 (GND) - Body ground |
W-B - Body ground |
Ground |
Always |
Below 1 Ω |
F46-5 (DM2) - F46-4 (GND) |
Y - W-B |
A.D.D. actuator motor |
Ignition switch ON Transfer shift lever position H4, L4 or N → H2 (During operation of A.D.D. actuator motor from LOCK to FREE) |
10 to 14 V |
Ignition switch ON Transfer shift lever position H4, L4 or N → H2 (A.D.D. actuator motor stopped) |
Below 1.5 V |
(b) Using an oscilloscope, check waveform 1.
Waveform 1 (Reference)
Item |
Content |
---|---|
Terminal No. (Symbols) |
F47-19 (CANH) - F46-4 (GND) |
Tool setting |
1 V/DIV., 10 μsec./DIV. |
Condition |
Engine stopped and ignition switch ON |
*1 |
Waveform 1 |
HINT:
The waveform varies depending on the CAN communication signal.
(c) Using an oscilloscope, check waveform 2.
Waveform 2 (Reference)
Item |
Content |
---|---|
Terminal No. (Symbols) |
F47-20 (CANL) - F46-4 (GND) |
Tool setting |
1 V/DIV., 10 μsec./DIV. |
Condition |
Engine stopped and ignition switch ON |
*1 |
Waveform 2 |
HINT:
The waveform varies depending on the CAN communication signal.
Installation
INSTALLATION
CAUTION / NOTICE / HINT
HINT:
Use the same procedure for the RH and LH sides.
The procedure listed below is for the LH side.
PROCEDURE
1. INSTALL FRONT DOOR BELT MOULDING LH
(a) Attach the 6 claws to install the front door ...
Occupant Classification Sensor Power Supply Circuit Malfunction (B1793)
DESCRIPTION
The occupant classification sensor power supply circuit consists of the occupant
classification ECU and occupant classification sensors.
DTC B1793 is stored when a malfunction is detected in the occupant classification
sensor power supply cir ...