DESCRIPTION
If there is a problem with the master cylinder solenoid (skid control ECU) power supply circuit, the skid control ECU stores DTCs and prohibits operation under the fail-safe function.
If the voltage supplied to the IG2 terminal is within the DTC detection range due to malfunctions in components such as the battery and generator circuit, this DTC is stored.
DTC Code |
DTC Detection Condition |
Trouble Area |
---|---|---|
C1242 |
The vehicle speed is 3 km/h (1.9 mph) or more and the voltage at the ECU IG2 terminal remains below 6.5 V for more than 7 seconds. |
|
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
PROCEDURE
1. |
CHECK TERMINAL VOLTAGE (IG2) |
(a) Disconnect the A7 skid control ECU connector.
(b) Measure the voltage according to the value(s) in the table below. Standard Voltage:
|
|
NG | ![]() |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
2. |
CHECK HARNESS AND CONNECTOR (GND1, GND2 AND GND3 TERMINAL) |
NG | ![]() |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
3. |
RECONFIRM DTC |
(a) Clear the DTCs (See page ).
(b) Turn the ignition switch off.
(c) Check if the same DTC is output (See page
).
HINT:
Reinstall the sensors, connectors, etc. and restore the previous vehicle conditions before rechecking for DTCs.
Result
Result |
Proceed to |
---|---|
DTC is output |
A |
DTC is not output |
B |
A | ![]() |
REPLACE MASTER CYLINDER SOLENOID |
B | ![]() |
USE SIMULATION METHOD TO CHECK |
Components
COMPONENTS
ILLUSTRATION
ILLUSTRATION
ILLUSTRATION
ILLUSTRATION
ILLUSTRATION
...
Road Test
ROAD TEST
1. PROBLEM SYMPTOM CONFIRMATION
(a) Based on the result of the customer problem analysis, try to reproduce the
symptoms. If the problem is that the transmission does not shift up or shift down,
or that the shift point is too high or too low, co ...