-
When the following continues for 10 seconds or more:
- At a vehicle speed of 3 km/h (2 mph) or more, the IG1 terminal voltage is 9.5 V or less.
-
When either of the following is detected:
- With the IG1 terminal voltage 9.5 V or less, communication with the skid control ECU is impossible.
- Vehicle speed sensor voltage is reduced for 60 seconds or more.
-
When the following continues for 3 seconds or more:
- The IG1 terminal voltage is 17 V or more.
| Last Modified: 04-05-2023 | 6.11:8.1.0 | Doc ID: RM10000000103QE |
| Model Year Start: 2017 | Model: Sienna | Prod Date Range: [08/2016 - ] |
| Title: MF1A (TRANSFER / 4WD / AWD): ACTIVE TORQUE CONTROL 4WD SYSTEM: C1241; Low Power Supply Voltage Malfunction; 2017 - 2020 MY Sienna [08/2016 - ] | ||
|
DTC |
C1241 |
Low Power Supply Voltage Malfunction |
DESCRIPTION
If a malfunction in the power source circuit occurs, or a malfunction in communication with the skid control ECU or in a speed sensor occurs, the 4WD control ECU will prohibit operations by the fail-safe function.
|
DTC No. |
DTC Detection Condition |
Trouble Area |
|---|---|---|
|
C1241 |
|
|
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 BRAKE CONTROL SYSTEM) |
(a) Check if CAN communication system DTCs are output (See page
).
(b) Start the engine.
(c) Drive the vehicle, accelerate to a speed of 3 km/h (2 mph) or more, and check if the speed sensor DTC (brake control system DTC) is output (See page
).
Result
|
Result |
Proceed to |
|---|---|
|
Neither CAN communication system DTC nor speed sensor DTC (brake control system DTC) is output |
A |
|
CAN communication system DTC is output |
B |
|
Speed sensor DTC (brake control system DTC) is output |
C |
| B |
|
REPAIR CIRCUIT INDICATOR BY OUTPUT CODE (CAN COMMUNICATION SYSTEM) (See page
|
| C |
|
REPAIR CIRCUIT INDICATOR BY OUTPUT CODE (BRAKE CONTROL SYSTEM) (See page
|
|
|
2. |
INSPECT BATTERY |
(a) Check the battery voltage.
Standard voltage:
11 to 14 V
| NG |
|
|
|
3. |
CHECK HARNESS AND CONNECTOR (4WD CONTROL ECU - BATTERY) |
(a) Disconnect the ECU connector.
(b) 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 |
|
|
4. |
CHECK HARNESS AND CONNECTOR (4WD CONTROL ECU - BODY GROUND) |
(a) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
K1-23 (GND) - Body Ground |
Always |
Below 1 Ω |
Text in Illustration
|
*a |
Rear view of wire harness connector (to 4WD Control ECU) |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
5. |
RECONFIRM DTC |
(a) Clear the DTC (See page
).
(b) Start the engine.
(c) Drive the vehicle, accelerate to a speed of 3 km/h (2 mph or more, and check if the same DTC is output.
Result
|
Result |
Proceed to |
|---|---|
|
DTC is output |
A |
|
DTC is not output |
B |
HINT:
Reinstall the sensor, connectors, etc. and restore the vehicle to its prior condition before rechecking DTCs.
| A |
|
| B |
|
CHECK FOR INTERMITTENT PROBLEMS (See page
|
|
|