DTC C1242: Open Circuit in IG1/IG2 Power Source Circuit: Procedure

CHECK TERMINAL VOLTAGE (IG2)

Measure the voltage according to the value(s) in the table below.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

STANDARD VOLTAGE

Tester Connection	Switch Condition	Specified Condition
A8-1 (IG2) - Body ground	Engine switch on (IG)	11 to 14 V

TEXT IN ILLUSTRATION

*a	Front view of wire harness connector (to Skid Control ECU)

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to next step

CHECK HARNESS AND CONNECTOR (GND1, GND2 AND GND3 TERMINAL) See step 2
NG → REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to next step

RECONFIRM DTC

Check if the same DTC is output. Refer to DTC CHECK / CLEAR [06/2012 - ] .

HINT:

Reinstall the sensors, connectors, etc. and restore the previous vehicle conditions before rechecking for DTCs.

RESULT

Result	Proceed to
DTC is not output	A
DTC is output	B

B → See step 4

A → See step 5

REPLACE MASTER CYLINDER SOLENOID. Refer to DISASSEMBLY [06/2012 - ]
USE SIMULATION METHOD TO CHECK. Refer to HOW TO PROCEED WITH TROUBLESHOOTING [06/2012 - ]