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 TECHSTREAM:
(1) Connect the Techstream to the DLC3.
(2) Start the engine.
(3) Enter the following menus: Chassis / ABS/VSC/TRAC / Data List.
(4) Read the ECU IG Power Voltage status.

ABS/VSC/TRAC:





OK:
The Techstream displays Normal (ECU IG Power Voltage of the skid control ECU is 9.8 to 14 V).




(b) WHEN NOT USING TECHSTREAM:
(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