Lexus IS250 IS220d GSE20 ALE20 - BRAKE CONTROL
INSPECT SKID CONTROL ECU (IG1 TERMINAL)
INSPECT SKID CONTROL ECU (GND TERMINAL)
DTC C1241/41 Low Battery Positive Voltage
DESCRIPTION
If a malfunction is detected in the power supply circuit, the skid control ECU outputs the DTC and prohibits operation with the fail safe function.
This DTC is stored when the IG1 terminal voltage deviates from the DTC detecting condition due to a malfunction in the power supply or charging circuit such as the battery or alternator circuit, etc.
The DTC is cancelled when the IG1 terminal voltage returns to normal.
| DTC No. | DTC Detection Condition | Trouble Area |
| C1241/41 | When any of the following is detected: At a vehicle speed of 2 mph (3 km/h) or more, the IG1 terminal voltage is 9.5 V or less for 10 seconds or more. When the solenoid relay remains ON and the IG1 terminal voltage is 9.5 V or less, the relay contact is open for 0.2 seconds or more. With the IG1 terminal voltage 9.5 V or less, the vehicle speed sensor power supply decreases for 60 seconds or more. | Battery Charging system Power source circuit Internal power supply circuit of the skid control ECU |
WIRING DIAGRAM
INSPECTION PROCEDURE
- NOTICE:
- When replacing the skid control ECU, perform zero point calibration and store system information .
| 1.INSPECT ECU-IG RH FUSE |
Remove the ECU-IG RH fuse from the main body ECU RH.
Measure the resistance according to the value(s) in the table below.
- Standard resistance:
Tester Connection Condition Specified Condition ECU-IG RH (10 A) fuse Always Below 1 Ω
|
| ||||
| OK | |
| 2.CHECK BATTERY |
Install the ECU-IG RH fuse.
Check the battery voltage.
- Standard voltage:
- 10 to 14 V
|
| ||||
| OK | |
| 3.INSPECT SKID CONTROL ECU (IG1 TERMINAL) |
Disconnect the skid control ECU connector.
Turn the engine switch on (IG).
Measure the voltage according to the value(s) in the table below.
- Standard voltage:
Tester Connection Condition Specified Condition J77-1 (IG1) - Body ground Engine switch on (IG) 10 to 14 V
|
| ||||
| OK | |
| 4.INSPECT SKID CONTROL ECU (GND TERMINAL) |
Turn the engine switch off.
Disconnect the skid control ECU connector.
Measure the resistance according to the value(s) in the table below.
- Standard resistance:
- LHD:
Tester Connection Condition Specified Condition J78-26 (GND1) - Body ground Always Below 1 Ω J78-14 (GND2) - Body ground Always Below 1 Ω A35-22 (GND3) - Body ground Always Below 1 Ω - RHD:
Tester Connection Condition Specified Condition J78-26 (GND1) - Body ground Always Below 1 Ω J78-14 (GND2) - Body ground Always Below 1 Ω J98-22 (GND3) - Body ground Always Below 1 Ω
|
| ||||
| OK | |
| 5.RECONFIRM DTC |
Reconnect the skid control ECU connectors.
Clear the DTC .
Turn the engine switch on (IG).
Check if the same DTC is recorded .
- Result:
Condition Proceed to DTC (C1241/41) is not output A DTC (C1241/41) is output B
- HINT:
- If troubleshooting has been carried out according to the Problem Symptoms Table, refer back to the table and proceed to the next step .
|
| ||||
| A | ||
| ||