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 assembly (skid control ECU) power supply circuit, the skid control ECU outputs the DTC and prohibits the ABS operation with the fail safe function.
If the voltage supplied to the IG1 terminal is not within the DTC detection threshold due to malfunctions in such as the battery and 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 (ECU-IG FUSE)
(a) Remove the ECU-IG fuse from the driver side J/B.





(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:






NG -- REPLACE FUSE (ECU-IG FUSE)
OK -- Continue to next step.
3. READ VALUE USING TECHSTREAM (IG1 POWER SUPPLY)
(a) Install the ECU-IG fuse.
(b) Connect Techstream to the DLC3.
(c) Turn the ignition switch to the ON position and turn the Techstream main switch on.
(d) Start the engine.
(e) Select the Data List mode on Techstream.

ABS / VSC / TRAC:





(f) Measure the voltage output from the ECU displayed on Techstream.
OK:
"Normal" is displayed.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (IG1 CIRCUIT)
OK -- Continue to next step.
4. INSPECT SKID CONTROL ECU (IG1 TERMINAL VOLTAGE)





(a) Disconnect the skid control ECU connector.
(b) Turn the ignition switch to ON position.
(c) Measure the voltage according to the value(s) in the table below.
Standard voltage:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (IG1 CIRCUIT)
OK -- Continue to next step.
5. INSPECT SKID CONTROL ECU (GND TERMINAL CONTINUITY)





(a) Turn the ignition switch off.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (GND CIRCUIT)
OK -- Continue to next step.
6. RECONFIRM DTC
(a) Clear the DTCs .
(b) Check that the same DTC is recorded .
HINT: Reinstall the sensors, connectors, etc. and restore the vehicle to its prior condition before rechecking for DTCs.

Result:






C -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
B -- END
A -- REPLACE BRAKE ACTUATOR ASSEMBLY