C1241

BRAKE CONTROL: VEHICLE STABILITY CONTROL SYSTEM: C1241/41: Low Battery Positive Voltage or Abnormally High Battery Positive Voltage

DTC C1241/41 - Low Battery Positive Voltage or Abnormally High Battery Positive Voltage

DESCRIPTION

When there is an abnormality in the power supply circuit of the VSC actuator (skid control ECU), the skid control ECU sets a DTC and the operation is prohibited by the fail-safe function. This DTC is set when the voltage supplied to terminal +BS is outside the DTC detection threshold due to abnormalities of the battery, power source circuits or charging circuits such as the alternator circuit.
The fail-safe function is canceled when the voltage to terminal +BS returns to normal.

HINT: If the vehicle speed is 20 km/h (12 mph) or less when the battery voltage is low, the ABS warning light, VSC OFF indicator light and SLIP indicator light illuminate. However, a DTC will not be output.

WIRING DIAGRAM

INSPECTION PROCEDURE

NOTE: When replacing the VSC actuator assembly, perform zero point calibration (Programming and Relearning).

PROCEDURE

1. INSPECT BATTERY
(a) Check the battery voltage.
Standard Voltage:
11 to 14 V

Result

D -- CHECK CHARGING SYSTEM
C -- CHECK CHARGING SYSTEM
B -- CHECK CHARGING SYSTEM
A -- Continue to next step.
2. INSPECT FUSE (ABS2)

(a) Remove the ABS2 H-fuse from the engine room relay block.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:

NG -- CHECK FOR SHORTS IN ALL HARNESSES AND CONNECTORS CONNECTED TO FUSE AND REPLACE FUSE
OK -- Continue to next step.
3. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - BATTERY AND BODY GROUND)

(a) Disconnect the A17 ECU connector.
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
4. RECONFIRM DTC
(a) Clear the DTCs (Reading and Clearing Diagnostic Trouble Codes).
(b) Start the engine.
(c) Check if the same DTCs are output (Reading and Clearing Diagnostic Trouble Codes).

Result

B -- USE SIMULATION METHOD TO CHECK
A -- REPLACE VSC ACTUATOR ASSEMBLY