ABS (Antilock Brake System)

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 (skid control ECU) power supply circuit, the skid control ECU outputs a 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 in parts such as the battery or alternator circuit, this DTC is stored.





WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. INSPECT BATTERY
(a) Check the battery voltage.
Standard Voltage:
11 to 14 V
NG -- INSPECT CHARGING SYSTEM
OK -- Continue to next step.
2. INSPECT FUSE (IG1 NO. 2)





(a) Remove the IG1 NO. 2 fuse from the driver side J/B.
(b) Measure the resistance of the IG1 NO. 2 fuse.
Standard Resistance:
Below 1 Ohms
(c) Reinstall the IG1 NO. 2 fuse.
NG -- CHECK FOR SHORTS IN ALL HARNESSES AND CONNECTORS CONNECTED TO FUSE AND REPLACE FUSE
OK -- Continue to next step.
3. INSPECT SKID CONTROL ECU TERMINAL VOLTAGE (IG1 TERMINAL)
(a) When using Techstream:
(1) Start the engine.
(2) Connect Techstream to the DLC3.
(3) Turn Techstream ON.
(4) Select the Data List mode on Techstream.
(5) Measure the voltage condition output from the ECU displayed on Techstream.

ABS/VSC/TRAC





OK:
"Normal" is displayed.
(b) When not using Techstream:





(1) Disconnect the skid control ECU connector.
(2) Turn the ignition switch to the ON position.
(3) Measure the voltage.
Standard Voltage:





(4) Turn the ignition switch to OFF.
(5) Reconnect the skid control ECU connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
4. CHECK HARNESS AND CONNECTOR (GND TERMINAL CONTINUITY)





(a) Disconnect the skid control ECU connector.
(b) Measure the resistance.
Standard Resistance:





(c) Reconnect the skid control ECU connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
5. RECONFIRM DTC
(a) Clear the DTCs (Reading and Clearing Diagnostic Trouble Codes).
(b) Drive the vehicle at 3 km/h (1.9 mph) or more for 10 seconds or more.
(c) Check if the same DTCs are detected.





NG -- END
A -- REPLACE BRAKE ACTUATOR