C1241

BRAKE CONTROL: ANTI-LOCK BRAKE SYSTEM: C1241/41: Low Battery Positive Voltage

DTC C1241/41 - Low Battery Positive Voltage

DESCRIPTION

If there is a problem with the brake actuator assembly (skid control ECU) power supply circuit, the skid control ECU outputs the DTC and prohibits operation under the fail safe function.
If the voltage supplied to the IG1 terminal is not within the DTC detection threshold due to malfunctions, such as the battery and alternator circuit, this DTC is stored.






WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. INSPECT BATTERY
(a) Check battery voltage.
Standard voltage:
11 to 14 V
NG -- INSPECT CHARGING SYSTEM
OK -- Continue to next step.
2. INSPECT FUSE (ECU-IG)





(a) Remove the ECU-IG fuse from the instrument panel junction block.
(b) Measure the resistance of the fuse.
Standard resistance:
Below 1 Ohms
NG -- REPLACE FUSE
OK -- Continue to next step.
3. CHECK SKID CONTROL ECU CONNECTOR (IG1 VOLTAGE)
(a) WHEN USING INTELLIGENT TESTER:
(1) Connect the intelligent tester to the DLC3.
(2) Start the engine.
(3) Select the tester menus: DIAGNOSTIC, OBD/MOBD, ABS/VSC and DATA LIST.
(4) Read the IG VOLTAGE status.






OK:
The tester displays Normal (IG VOLTAGE of the ABS ECU is 9.8 to 14 V).





(b) WHEN NOT USING INTELLIGENT TESTER:
(1) Disconnect the S1 skid control ECU connector.
(2) Turn the ignition switch to the ON position.
(3) Measure the voltage of the wire harness side connector.
Standard voltage:






NG -- REPAIR OR REPLACE HARNESS AND CONNECTOR
OK -- Continue to next step.
4. CHECK SKID CONTROL ECU CONNECTOR (GROUND)





(a) Disconnect the S1 skid control ECU connector.
(b) Measure the resistance of the wire harness side connector.
Standard resistance:






NG -- REPAIR OR REPLACE HARNESS AND CONNECTOR
OK -- REPLACE BRAKE ACTUATOR ASSEMBLY