DESCRIPTION
If a malfunction is detected in the power supply circuit, the skid control ECU (brake actuator assembly) stores this DTC and the fail-safe function prohibits ABS operation. This DTC is stored when the +BS terminal voltage meets one of the DTC detection conditions due to a malfunction in the power supply or charging circuit such as the battery or alternator circuit, etc. The DTC is cleared when the +BS terminal voltage returns to normal.
DTC No. |
Detection Item |
DTC Detection Condition |
Trouble Area |
---|---|---|---|
C1241 |
Low Power Supply Voltage Malfunction |
Any of the following is detected:
|
|
*: The skid control ECU (brake actuator assembly) monitors the resistance of the power source line at the +BS terminal. A malfunction is detected when an abnormality occurs in the +BS terminal wire harness or its connection and the skid control ECU (brake actuator assembly) determines that the wiring resistance at the +BS terminal exceeds the standard resistance.
DTC Detection Conditions: C1241
Vehicle Condition |
|||||
---|---|---|---|---|---|
Pattern 1 |
Pattern 2 |
Pattern 3 |
Pattern 4 |
||
Diagnosis Condition |
- |
- |
- |
- |
- |
Malfunction Status |
The vehicle speed is 6 km/h (4 mph) or more and the +BS terminal voltage (soft low voltage) is less than 9.6 V. |
○ |
- |
- |
- |
The vehicle speed is 6 km/h (4 mph) or more and the +BS terminal voltage (hard low voltage) is less than 6.9 V. |
- |
○ |
- |
- |
|
The vehicle speed is 15 km/h (9 mph) or more, the +BS terminal voltage is 9.6 V or more, the skid control ECU (brake actuator assembly) turns on more than one valve at the same time within a short period of time and the valve relay supply voltage drop exceeds the threshold.* |
- |
- |
○ |
- |
|
The +BS terminal voltage is less than 6.7 V and the skid control ECU (brake actuator assembly) judges that power supply voltage is abnormal. |
- |
- |
- |
○ |
|
Detection Time |
1 second or more |
1 second or more |
- |
0.06 seconds or more |
|
Number of Trips |
1 trip |
1 trip |
1 trip |
1 trip |
HINT:
DTC will be output when conditions for either of the patterns in the table above are met.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
Click here
PROCEDURE
1. |
CHECK BATTERY |
(a) Check the battery voltage.
Standard Voltage:
11 to 14 V
NG | ![]() |
CHECK OR REPLACE CHARGING SYSTEM COMPONENT OR BATTERY |
|
2. |
CHECK HARNESS AND CONNECTOR (POWER SOURCE TERMINAL) |
(a) Make sure that there is no looseness at the locking part and the connecting part of the connector. |
|
(b) Disconnect the A42 skid control ECU (brake actuator assembly) connector.
(c) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
A42-30 (+BS) - Body ground |
Always |
11 to 14 V |
NG | ![]() |
REPAIR OR REPLACE HARNESS OR CONNECTOR (IG1 CIRCUIT) |
|
3. |
CHECK HARNESS AND CONNECTOR (POWER SOURCE (IG1) TERMINAL) |
(a) Disconnect the A42 skid control ECU (brake actuator assembly) connector. |
|
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
A42-36 (IG1) - Body ground |
Ignition switch ON |
11 to 14 V |
NG | ![]() |
REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT) |
|
4. |
CHECK HARNESS AND CONNECTOR (GND1 TERMINAL) |
(a) Turn the ignition switch off. |
|
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
A42-46 (GND1) - Body ground |
Always |
Below 1 Ω |
NG | ![]() |
REPAIR OR REPLACE HARNESS OR CONNECTOR (GND1 CIRCUIT) |
|
5. |
RECONFIRM DTC |
(a) Reconnect the A42 skid control ECU (brake actuator assembly) connector.
(b) Clear the DTCs.
Click here
(c) Turn the ignition switch off.
(d) Start the engine.
(e) Perform a road test.
(f) Check if the same DTC is output.
Click here
Result |
Proceed to |
---|---|
DTC C1241 is not output. |
A |
DTC C1241 is output. |
B |
HINT:
If troubleshooting has been carried out according to Problem Symptoms Table, refer back to the table and proceed to the next step before replacing parts.
Click here
A | ![]() |
USE SIMULATION METHOD TO CHECK
|
B | ![]() |
REPLACE BRAKE ACTUATOR ASSEMBLY |
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