| Last Modified: 04-05-2023 | 6.11:8.1.0 | Doc ID: RM10000000103RA |
| Model Year Start: 2017 | Model: Sienna | Prod Date Range: [08/2016 - ] |
| Title: MF1A (TRANSFER / 4WD / AWD): ACTIVE TORQUE CONTROL 4WD SYSTEM: AWD Warning Light Remains ON; 2017 - 2020 MY Sienna [08/2016 - ] | ||
|
AWD Warning Light Remains ON |
DESCRIPTION
The 4WD ECU assembly is connected to the combination meter assembly via the CAN communication system. If any of the following conditions are detected, the multi-information display indicates a malfunction in the active torque control 4WD system.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
Inspect the fuses for circuits related to this system before performing the following inspection procedure.
HINT:
Check the condition of each related circuit connector before troubleshooting (See page
![2016 - 2020 MY Sienna [12/2015 - ]; INTRODUCTION: HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS: ELECTRONIC CIRCUIT INSPECTION PROCEDURE](/t3Portal/stylegraphics/info.gif)
).
PROCEDURE
|
1. |
CHECK FOR DTC (CAN COMMUNICATION SYSTEM AND ACTIVE TORQUE CONTROL 4WD SYSTEM) |
(a) Check if CAN communication system DTCs are output (See page
).
(b) Check if the active torque control 4WD system DTC is output (See page
).
Result
|
Result |
Proceed to |
|---|---|
|
Neither CAN communication system DTC nor active torque control 4WD system DTC is output |
A |
|
CAN communication DTC is output |
B |
|
Active torque control 4WD system DTC is output |
C |
HINT:
When DTCs indicating a CAN communication system malfunction are output, repair the CAN communication system before repairing each corresponding sensor.
| B |
|
REPAIR CIRCUIT INDICATOR BY OUTPUT CODE (CAN COMMUNICATION SYSTEM) (See page
|
| C |
|
REPAIR CIRCUIT INDICATOR BY OUTPUT CODE (ACTIVE TORQUE CONTROL 4WD SYSTEM) |
|
|
2. |
CHECK IF 4WD CONTROL ECU CONNECTOR IS SECURELY CONNECTED |
(a) Check if the skid control ECU connector is securely connected.
OK:
The connector is securely connected.
| NG |
|
CONNECT CONNECTOR TO ECU CORRECTLY |
|
|
3. |
INSPECT BATTERY |
(a) Check the battery voltage.
Standard voltage:
11 to 14 V
| NG |
|
|
|
4. |
CHECK HARNESS AND CONNECTOR (4WD CONTROL ECU - BATTERY) |
|
(a) Disconnect the ECU 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 |
|---|---|---|
|
K1-11 (IG1) - Body Ground |
Ignition switch ON |
11 to 14 V |
Text in Illustration
|
*a |
Rear view of wire harness connector (to 4WD Control ECU) |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
5. |
CHECK HARNESS AND CONNECTOR (4WD CONTROL ECU - BODY GROUND) |
|
(a) Measure the resistance according to the value(s) in the table below. Standard Resistance:
Text in Illustration
|
|
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
6. |
READ VALUE USING TECHSTREAM (4WD WARNING LIGHT) |
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Enter the following menus: Chassis / Four Wheel Drive / Data List.
(e) According to the display on the Techstream, read the Data List.
Four Wheel Drive
|
Tester Display |
Measurement Item/Range |
Normal Condition |
Diagnostic Note |
|---|---|---|---|
|
4WD Warning Light |
AWD warning (multi-information display) / ON or OFF |
ON: Warning on OFF: Warning off |
Observe combination meter |
(f) Check the Techstream display condition of the AWD warning light.
Result
|
Result |
Proceed to |
|---|---|
|
Display of the Data List remains OFF |
A |
|
Display of the Data List remains ON |
B |
| A |
|
| B |
|
|
|