Toyota Tacoma 2015-2018 Service Manual: Terminals Of Ecu
TERMINALS OF ECU
1. CHECK MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)
(a) Disconnect the 1D and 1F driver side junction block connectors.
(b) Measure the voltage and resistance according to the value(s) in the table below.
HINT:
Measure the values on the wire harness side with the connectors disconnected.
|
Tester Connection |
Wiring Color |
Terminal Description |
Condition |
Specified Condition |
|---|---|---|---|---|
|
1F-15 (BECU) - Body ground |
R - Body ground |
Battery power supply |
Always |
11 to 14 V |
|
1D-5 (GND1) - Body ground |
W-B - Body ground |
Ground |
Always |
Below 1 Ω |
If the result is not as specified, there may be a malfunction in the wire harness.
(c) Reconnect the 1D and 1F driver side junction block connectors.
(d) Check for pulses according to the value(s) in the table below.
|
Tester Connection |
Wiring Color |
Terminal Description |
Condition |
Specified Condition |
|---|---|---|---|---|
|
1D-12 (LIN2) - 1D-5 (GND1) |
V - W-B |
LIN communication line |
Ignition switch ON |
Pulse generation |
|
1D-13 (LIN2) - 1D-5 (GND1) |
V - W-B |
LIN communication line |
Ignition switch ON |
Pulse generation |
|
1D-25 (LIN2) - 1D-5 (GND1) |
V - W-B |
LIN communication line |
Ignition switch ON |
Pulse generation |
If the result is not as specified, the main body ECU (multiplex network body ECU) or driver side junction block may be malfunctioning.
2. CHECK FRONT POWER WINDOW REGULATOR MOTOR ASSEMBLY LH (w/ Jam Protection Function)
(a) Disconnect the P24 front power window regulator motor assembly LH connector.
(b) Measure the voltage and resistance according to the value(s) in the table below.
HINT:
Measure the values on the wire harness side with the connector disconnected.
|
Tester Connection |
Wiring Color |
Terminal Description |
Condition |
Specified Condition |
|---|---|---|---|---|
|
P24-2 (B) - P24-1 (GND) |
R - W-B |
Battery power supply |
Always |
11 to 14 V |
|
P24-1 (GND) - Body ground |
W-B - Body ground |
Ground |
Always |
Below 1 Ω |
If the result is not as specified, there may be a malfunction in the wire harness.
(c) Reconnect the P24 front power window regulator motor assembly LH connector.
(d) Check for pulses according to the value(s) in the table below.
|
Tester Connection |
Wiring Color |
Terminal Description |
Condition |
Specified Condition |
|---|---|---|---|---|
|
P24-9 (LIN) - P24-1 (GND) |
GR - W-B |
LIN communication line |
Ignition switch ON |
Pulse generation |
If the result is not as specified, the front power window regulator motor assembly LH may be malfunctioning.
3. CHECK FRONT POWER WINDOW REGULATOR MOTOR ASSEMBLY RH (w/ Jam Protection Function)
(a) Disconnect the P22 front power window regulator motor assembly RH connector.
(b) Measure the voltage and resistance according to the value(s) in the table below.
HINT:
Measure the values on the wire harness side with the connector disconnected.
|
Tester Connection |
Wiring Color |
Terminal Description |
Condition |
Specified Condition |
|---|---|---|---|---|
|
P22-2 (B) - P22-1 (GND) |
W - W-B |
Battery power supply |
Always |
11 to 14 V |
|
P22-1 (GND) - Body ground |
W-B - Body ground |
Ground |
Always |
Below 1 Ω |
If the result is not as specified, there may be a malfunction in the wire harness.
(c) Reconnect the P22 front power window regulator motor assembly RH connector.
(d) Check for pulses according to the value(s) in the table below.
|
Tester Connection |
Wiring Color |
Terminal Description |
Condition |
Specified Condition |
|---|---|---|---|---|
|
P22-9 (LIN) - P22-1 (GND) |
V - W-B |
LIN communication line |
Ignition switch ON |
Pulse generation |
If the result is not as specified, the front power window regulator motor assembly RH may be malfunctioning.
4. CHECK POWER WINDOW REGULATOR MASTER SWITCH ASSEMBLY (for Double Cab with Jam Protection Function)
(a) Disconnect the P18 power window regulator master switch assembly connector.
(b) Measure the voltage and resistance according to the value(s) in the table below.
HINT:
Measure the values on the wire harness side with the connector disconnected.
|
Tester Connection |
Wiring Color |
Terminal Description |
Condition |
Specified Condition |
|---|---|---|---|---|
|
P18-3 (B) - P18-1 (GND) |
R - W-B |
Battery power supply |
Always |
11 to 14 V |
|
P18-1 (GND) - Body ground |
W-B - Body ground |
Ground |
Always |
Below 1 Ω |
If the result is not as specified, there may be a malfunction in the wire harness.
(c) Reconnect the P18 power window regulator master switch assembly connector.
(d) Check for pulses according to the value(s) in the table below.
|
Tester Connection |
Wiring Color |
Terminal Description |
Condition |
Specified Condition |
|---|---|---|---|---|
|
P18-6 (LIN1) - P18-1 (GND) |
V - W-B |
LIN communication line |
Ignition switch ON |
Pulse generation |
|
P18-7 (LIN2) - P18-1 (GND) |
GR - W-B |
LIN communication line |
Ignition switch ON |
Pulse generation |
If the result is not as specified, the power window regulator master switch assembly may be malfunctioning.
5. CHECK POWER WINDOW REGULATOR MASTER SWITCH ASSEMBLY (for Access Cab with Jam Protection Function)
(a) Disconnect the P23 power window regulator master switch assembly connector.
(b) Measure the voltage and resistance according to the value(s) in the table below.
HINT:
Measure the values on the wire harness side with the connector disconnected.
|
Tester Connection |
Wiring Color |
Terminal Description |
Condition |
Specified Condition |
|---|---|---|---|---|
|
P23-11 (B) - P23-12 (GND) |
R - W-B |
Battery power supply |
Always |
11 to 14 V |
|
P23-12 (GND) - Body ground |
W-B - Body ground |
Ground |
Always |
Below 1 Ω |
If the result is not as specified, there may be a malfunction in the wire harness.
(c) Reconnect the P23 power window regulator master switch assembly connector.
(d) Check for pulses according to the value(s) in the table below.
|
Tester Connection |
Wiring Color |
Terminal Description |
Condition |
Specified Condition |
|---|---|---|---|---|
|
P23-17 (LIN1) - P23-12 (GND) |
V - W-B |
LIN communication line |
Ignition switch ON |
Pulse generation |
|
P23-16 (LIN2) - P23-12 (GND) |
GR - W-B |
LIN communication line |
Ignition switch ON |
Pulse generation |
If the result is not as specified, the power window regulator master switch assembly may be malfunctioning.
6. CHECK SLIDING ROOF ECU (SLIDING ROOF DRIVE GEAR SUB-ASSEMBLY) (w/ Sliding Roof)
(a) Disconnect the S50 sliding roof ECU (sliding roof drive gear sub-assembly) connector.
(b) Measure the voltage and resistance according to the value(s) in the table below.
HINT:
Measure the values on the wire harness side with the connector disconnected.
|
Tester Connection |
Wiring Color |
Terminal Description |
Condition |
Specified Condition |
|---|---|---|---|---|
|
S50-8 (B) - S50-12 (E) |
W - W-B |
Battery power supply |
Always |
11 to 14 V |
|
S50-12 (E) - Body ground |
W-B - Body ground |
Ground |
Always |
Below 1 Ω |
If the result is not as specified, there may be a malfunction in the wire harness.
(c) Reconnect the S50 sliding roof ECU (sliding roof drive gear sub-assembly) connector.
(d) Check for pulses according to the value(s) in the table below.
|
Tester Connection |
Wiring Color |
Terminal Description |
Condition |
Specified Condition |
|---|---|---|---|---|
|
S50-11 (LIN) - S50-12 (E) |
V - W-B |
LIN communication line |
Ignition switch ON |
Pulse generation |
If the result is not as specified, the sliding roof ECU (sliding roof drive gear sub-assembly) may be malfunctioning.
7. CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) (w/ Smart Key System)
(a) Disconnect the C29 certification ECU (smart key ECU assembly) connector.
(b) Measure the voltage and resistance according to the value(s) in the table below.
HINT:
Measure the values on the wire harness side with the connector disconnected.
|
Tester Connection |
Wiring Color |
Terminal Description |
Condition |
Specified Condition |
|---|---|---|---|---|
|
C29-10 (+B) - C29-11 (E) |
P - W-B |
Battery power supply |
Always |
11 to 14 V |
|
C29-11 (E) - Body ground |
W-B - Body ground |
Ground |
Always |
Below 1 Ω |
If the result is not as specified, there may be a malfunction in the wire harness.
(c) Reconnect the C29 certification ECU (smart key ECU assembly) connector.
(d) Measure the voltage and check for pulses according to the value(s) in the table below.
|
Tester Connection |
Wiring Color |
Terminal Description |
Condition |
Specified Condition |
|---|---|---|---|---|
|
C29-6 (LIN) - C29-11 (E) |
L - W-B |
LIN communication line |
Ignition switch ON |
Pulse generation |
If the result is not as specified, the certification ECU (smart key ECU assembly) may be malfunctioning.
8. CHECK STEERING LOCK ECU (STEERING LOCK ACTUATOR OR UPPER BRACKET ASSEMBLY) (w/ Smart Key System)
(a) Disconnect the S45 steering lock ECU (steering lock actuator or upper bracket assembly) connector.
(b) Measure the resistance and voltage according to the value(s) in the table below.
|
Terminal No. (Symbol) |
Wiring Color |
Terminal Description |
Condition |
Specified Condition |
|---|---|---|---|---|
|
S45-1 (GND) - Body ground |
W-B - Body ground |
Ground |
Always |
Below 1 Ω |
|
S45-7 (B) - S45-1 (GND) |
R - W-B |
Battery power supply |
Always |
11 to 14 V |
If the result is not as specified, there may be a malfunction on the wire harness side.
(c) Reconnect the S45 steering lock ECU (steering lock actuator or upper bracket assembly) connector.
(d) Measure the voltage and check for pulses according to the value(s) in the table below.
|
Tester Connection |
Wiring Color |
Terminal Description |
Condition |
Specified Condition |
|---|---|---|---|---|
|
S45-5 (LIN) - S45-1 (GND) |
L - W-B |
LIN communication line |
Ignition switch ON |
Pulse generation |
If the result is not as specified, the steering lock ECU (steering lock actuator or upper bracket assembly) may be malfunctioning.
How To Proceed With Troubleshooting
CAUTION / NOTICE / HINT
HINT:
Use the following procedure to troubleshoot the LIN communication system.
*: Use the Techstream.
PROCEDURE
1.
VEHICLE BROU ...
Data List / Active Test
DATA LIST / ACTIVE TEST
1. DATA LIST
HINT:
Using the Techstream to read the Data List allows the values or states of switches,
sensors, actuators and other items to be read without removing any p ...
Other materials:
CD cannot be Inserted / Played or CD is Ejected Right After Insertion
PROCEDURE
1.
CHECK IF A PROPER CD IS INSERTED
(a) Make sure that the CD is an audio CD or a CD with an MP3, WMA or AAC file,
and that it is not deformed, flawed, stained, deteriorated or otherwise defective.
OK:
CD is normal.
HINT:
Translucent or uniq ...
Dtc Check / Clear
DTC CHECK / CLEAR
CHECK DTC
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Enter the following menus: Powertrain / Radar Cruise 1*1 / Trouble Codes.
(e) Enter the following menus: Powertrain / Radar Cruise 2*2 / Trouble Codes.
(f) C ...
ABS Warning Light Remains ON
DESCRIPTION
The skid control ECU (brake actuator assembly) is connected to the combination
meter assembly via CAN communication.
If any of the following is detected, the ABS warning light remains on:
The skid control ECU (brake actuator assembly) connectors are disconnected
from the ...
