C1242

BRAKE CONTROL: VEHICLE STABILITY CONTROL SYSTEM: C1242/42: IG2 Power Source Circuit

DTC C1242/42 - IG2 Power Source Circuit

DESCRIPTION

If there is a problem with the master cylinder solenoid (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 terminal IG1 and/or IG2 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:
10 to 14 V
NG -- INSPECT CHARGING SYSTEM
OK -- Continue to next step.
2. INSPECT FUSE (IGN FUSE)





(a) Remove the IGN fuse from the driver side J/B.
(b) Measure the resistance of the IGN fuse.
Standard Voltage:
Below 1 Ohms
(c) Reinstall the IGN 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 (IG2 TERMINAL)





(a) Disconnect the skid control ECU connector.
(b) Turn the ignition switch to the ON position.
(c) Measure the voltage.
Standard Voltage:





(d) Turn the ignition switch to OFF.
(e) Reconnect the skid control ECU connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
4. INSPECT SKID CONTROL ECU CONNECTOR (GND TERMINAL)





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





(c) Reconnect the skid control ECU connectors.
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 a speed of 3 km/h (1.9 mph) or more for 7 seconds or more.
(c) Check if the same DTCs are detected.





B -- END
A -- REPLACE MASTER CYLINDER SOLENOID