DESCRIPTION
If a malfunction in the power source circuit occurs, or a communication malfunction with the skid control ECU (brake actuator assembly) or speed sensor occurs, the 4WD ECU assembly prohibits operation.
DTC No. | Detection Item | DTC Detection Condition | Trouble Area |
---|---|---|---|
C1241 | Low or High Power Supply Voltage |
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WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
Click here
HINT:
Check the condition of each related circuit connector before troubleshooting.
Click here
PROCEDURE
1. | CHECK FOR DTC (CAN COMMUNICATION SYSTEM AND VEHICLE STABILITY CONTROL SYSTEM) |
(a) Check if CAN communication DTCs are output.
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(b) Start the engine.
(c) Drive the vehicle, accelerate to a speed of 3 km/h (2 mph) or more for 60 seconds or more, and check if any DTCs related to a speed sensor are output.
Chassis > Brake/EPB > Trouble Codes Result | Proceed to |
---|---|
CAN communication system DTCs and vehicle stability control system DTCs are not output | A |
CAN communication DTCs are output | B |
Vehicle stability control system DTCs are output | C |
HINT:
If CAN communication DTCs are output, perform troubleshooting for the CAN communication system first.
B | ![]() | GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) |
C | ![]() | REPAIR CIRCUIT INDICATED BY OUTPUT CODE (VEHICLE STABILITY CONTROL SYSTEM) |
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2. | INSPECT BATTERY |
(a) Check the battery voltage.
Standard Voltage:
11 to 14 V
NG | ![]() | CHECK CHARGING SYSTEM |
|
3. | CHECK HARNESS AND CONNECTOR (IG1 TERMINAL) |
(a) Disconnect the R10 4WD ECU assembly connector.
(b) Turn the engine switch on (IG).
(c) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection | Switch Condition | Specified Condition |
---|---|---|
R10-3 (IG1) - Body ground | Engine switch on (IG) | 11 to 14 V |
NG | ![]() | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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4. | CHECK HARNESS AND CONNECTOR (GND TERMINAL) |
(a) Turn the engine switch off.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection | Condition | Specified Condition |
---|---|---|
R10-4 (GND) - Body ground | Always | Below 1 Ω |
NG | ![]() | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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5. | RECONFIRM DTC |
(a) Connect the R10 4WD ECU assembly connector.
(b) Clear the DTCs.
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(c) Start the engine.
(d) Drive the vehicle, accelerate to a speed of 3 km/h (2 mph) or more for 60 seconds or more, and check if the same DTC is output.
Click here
Result | Proceed to |
---|---|
DTCs are output | A |
DTCs are not output | B |
A | ![]() | REPLACE 4WD ECU ASSEMBLY |
B | ![]() | CHECK FOR INTERMITTENT PROBLEMS |
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