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 IG1 terminal voltage deviates from the DTC detection condition due to a malfunction in the power supply or charging circuit such as the battery or generator circuit, etc.
The DTC is canceled when the IG1 terminal voltage returns to normal.
DTC No. | Detection Item | DTC Detection Condition | Trouble Area |
---|---|---|---|
C1241 | Low Power Supply Voltage Malfunction | When any of the following is detected:
|
|
WIRING DIAGRAM
*a | from IG Circuit |
*b | IG1 NO. 3 |
*c | Skid Control ECU (Brake Actuator Assembly) |
CAUTION / NOTICE / HINT
Note
When replacing the skid control ECU (brake actuator assembly), perform Test Mode (Signal Check) to acquire the rear differential lock identification information.
Inspect the fuses for circuits related to this system before performing the following inspection procedure.
PROCEDURE
INSPECT BATTERY
Check the battery voltage.
Standard voltage |
---|
11 to 14 V |
Result | |||
---|---|---|---|
|
NG |
CHECK OR REPLACE CHARGING SYSTEM OR BATTERY for 1GR-FE: Click here |
OK |
CHECK TERMINAL VOLTAGE (IG1 TERMINAL)
Make sure that there is no looseness in the locking part and connecting part of the connectors.
*a | Front view of wire harness connector (to Skid Control ECU [Brake Actuator Assembly]) |
Disconnect the A68 skid control ECU (brake actuator assembly) connector.
Turn the ignition switch to ON.
Measure the voltage according to the value(s) in the table below.
Standard Voltage | ||||||
---|---|---|---|---|---|---|
|
Result | |||
---|---|---|---|
|
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR (IG1 CIRCUIT) |
OK |
CHECK HARNESS AND CONNECTOR (GND1 TERMINAL)
Turn the ignition switch off.
*a | Front view of wire harness connector (to Skid Control ECU [Brake Actuator Assembly]) |
Measure the resistance according to the value(s) in the table below.
Standard Resistance | ||||||
---|---|---|---|---|---|---|
|
Result | |||
---|---|---|---|
|
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR (GND1 CIRCUIT) |
OK |
RECONFIRM DTC
Reconnect the A68 skid control ECU (brake actuator assembly) connector.
Clear the DTC.
Turn the ignition switch off.
Start the engine.
Drive the vehicle at a speed of 20 km/h (12 mph) or more for 30 seconds or more.
Check if the same DTC is recorded.
Tech Tips
If troubleshooting has been carried out according to the Problem Symptoms Table, refer back to the table and proceed to the next step.
Result | |||
---|---|---|---|
|
DTC C1241 is not output |
USE SIMULATION METHOD TO CHECK Click here |
DTC C1241 is output |
REPLACE BRAKE ACTUATOR ASSEMBLY Click here |