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 IG2 is not within the DTC detection threshold due to malfunctions in parts such as the battery and generator circuit, this DTC is stored.






WIRING DIAGRAM






INSPECTION PROCEDURE
NOTE: When replacing the master cylinder solenoid, perform zero point calibration Programming and Relearning.

PROCEDURE

1. CHECK BATTERY VOLTAGE
(a) Check the battery voltage.
Standard voltage:
11 to 14 V
NG -- CHECK CHARGING SYSTEM
OK -- Continue to next step.
2. CHECK SKID CONTROL ECU TERMINAL VOLTAGE (IG2)




(a) Disconnect the skid control ECU A5 connector.
(b) Measure the voltage.
Standard voltage:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
3. INSPECT FUSE (IGN)




(a) Remove the IGN fuse from the driver side J/B.
(b) Measure the resistance.
Standard resistance:
Below 1 Ohms
NG -- CHECK FOR SHORTS IN ALL HARNESSES AND CONNECTORS CONNECTED TO FUSE AND REPLACE FUSE
OK -- Continue to next step.
4. CHECK HARNESS AND CONNECTOR (GND TERMINAL CONTINUITY)
(a) Confirm that the skid control ECU connector and speed sensor connector are properly connected.




(b) Disconnect the skid control ECU connectors.
(c) Inspect both the connector case and the terminal for deformation and corrosion.
OK:
No deformation or corrosion.
(d) Measure the resistance.
Standard resistance:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
5. RECONFIRM DTC
(a) Clear the DTC Reading and Clearing Diagnostic Trouble Codes.
(b) Drive the vehicle at a speed of 2 mph (3 km/h) or more for 7 seconds or more.
(c) Check if the same DTC is output Reading and Clearing Diagnostic Trouble Codes.
B -- END
A -- REPLACE MASTER CYLINDER SOLENOID