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

If a malfunction is detected in the power supply circuit, the skid control ECU (housed in the ABS & TRACTION actuator assembly) outputs the DTC and prohibits operation with the fail-safe function.
This DTC is stored when the IG1 terminal voltage deviates from the DTC detecting condition due to a malfunction in the power supply or charging circuit such as the battery or alternator circuit, etc.
The DTC is cancelled when the IG1 terminal voltage returns to normal.





WIRING DIAGRAM





INSPECTION PROCEDURE

NOTE: When replacing the ABS & TRACTION actuator assembly, perform zero point calibration Programming and Relearning.

PROCEDURE

1. INSPECT FUSE (ECU IG NO.2 FUSE)




(a) Remove the ECU IG No. 2 fuse from the instrument panel J/B.
(b) Measure the resistance according to the value(s) in the table below.
Resistance:






NG -- CHECK FOR SHORT IN ALL HARNESS AND CONNECTOR CONNECTED TO FUSE AND REPLACE FUSE
OK -- Continue to next step.

2. INSPECT BATTERY
(a) Check the battery voltage.
Voltage:
10 to 14 V

NG -- INSPECT CHARGING SYSTEM
OK -- Continue to next step.

3. INSPECT SKID CONTROL ECU TERMINAL VOLTAGE (IG1 TERMINAL)




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






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (IG1 CIRCUIT)
OK -- Continue to next step.

4. INSPECT SKID CONTROL ECU (GND TERMINAL CONTINUITY)




(a) Disconnect the skid control ECU connector.
(b) Measure the resistance according to the value(s) in the table below.
Resistance:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (GND CIRCUIT)
OK -- Continue to next step.

5. INSPECT SKID CONTROL ECU TERMINAL VOLTAGE (IG1 TERMINAL)
(a) Connect Techstream to the DLC3.
(b) Start the engine.
(c) Select DATA LIST on Techstream.

DATA LIST: ABS / VSC / TRAC





(d) Read the voltage condition output from the ECU displayed on Techstream.
OK:
"NORMAL" is displayed.

HINT:
- These DTCs may be restored due to a malfunction in the connector terminal connection, etc.
- If troubleshooting has been carried out according to the PROBLEM SYMPTOMS TABLE, refer back to the table and proceed to the next step Problem Symptoms Table.

NG -- REPLACE ABS & TRACTION ACTUATOR ASSEMBLY
OK -- END