Toyota Tacoma (2015-2018) Service Manual: Open Circuit in IG1/IG2 Power Source Circuit (C1242)
DESCRIPTION
If there is a problem with the skid control ECU (master cylinder solenoid) 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.
|
DTC No. |
DTC Detecting Condition |
Trouble Areas |
|---|---|---|
|
C1242 |
Vehicle speed 3 km/h (1.9 mph) or more and voltage of skid control ECU (master cylinder solenoid) terminal IG1 and/or IG2 remains at below 6.5 V for more than 7 seconds. |
|
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
- When replacing the skid control ECU (master cylinder solenoid), perform
zero point calibration (See page
.gif)
). - Inspect the fuses for circuits related to this system before performing the following inspection procedure.
PROCEDURE
|
1. |
INSPECT BATTERY |
(a) Check the battery voltage.
Standard Voltage:
11 to 14 V
| NG | .gif) |
GO TO CHARGING SYSTEM |
|
.gif)
|
2. |
CHECK HARNESS AND CONNECTOR (IG2 TERMINAL) |
|
(a) Disconnect the skid control ECU (master cylinder solenoid) connector. |
|
(b) Turn the ignition switch to the ON position.
(c) Measure the voltage.
Standard Voltage:
|
Tester Connection |
Specified Condition |
|---|---|
|
S2-1 (IG2) - Body ground |
10 to 14 V |
|
*a |
Front view of wire harness connector (to Skid Control ECU (Master Cylinder Solenoid)) |
(d) Reconnect the skid control ECU (master cylinder solenoid) connector.
(e) Turn the ignition switch to OFF.
| NG | |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
3. |
CHECK HARNESS AND CONNECTOR (GND TERMINAL) |
|
(a) Disconnect the skid control ECU (master cylinder solenoid) connectors. |
|
(b) Measure the resistance.
Standard Resistance:
|
Tester Connection |
Specified Condition |
|---|---|
|
S1-1 (GND1) - Body ground |
Below 1 Ω |
|
S1-32 (GND2) - Body ground |
Below 1 Ω |
|
S2-4 (GND3) - Body ground |
Below 1 Ω |
(c) Reconnect the skid control ECU (master cylinder solenoid) connectors.
| NG | |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
4. |
RECONFIRM DTC |
(a) Clear the DTCs (See page
).
(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.
|
Result |
Proceed to |
|---|---|
|
DTC output |
A |
|
DTC not output |
B |
| A | |
REPLACE MASTER CYLINDER SOLENOID |
| B | |
END |
Low Power Supply Voltage Malfunction (C1241)
DESCRIPTION
If there is a problem with the skid control ECU (master cylinder solenoid) power
supply circuit, the skid control ECU outputs the DTC and prohibits operation under
the fail-safe funct ...
Open in Pump Motor Circuit (C1251)
DESCRIPTION
The motor relay (semiconductor relay) is built into the master cylinder solenoid
and drives the pump motor based on a signal from the skid control ECU (master cylinder
solenoid).
...
Other materials:
Installation
INSTALLATION
PROCEDURE
1. INSTALL CENTER STOP LIGHT ASSEMBLY (for Bulb Type Stop Light)
(a) Install the 3 center stop light bulbs to the 3 center stop light sockets.
(b) Turn the 3 center stop light sockets with 3 center stop light bulbs
in the direction indicated by the arrow sho ...
Air Outlet Damper Position Sensor Circuit (B1433/33)
DESCRIPTION
This sensor detects the position of the mode damper and sends the appropriate
signals to the air conditioning amplifier assembly. The position sensor is built
into the No. 1 air conditioning radiator damper servo sub-assembly (for mode switching).
DTC No.
DTC ...
Rear Speed Sensor RH Performance (C1411,C1412)
DESCRIPTION
Refer to DTCs C1401 and C1402 (See page ).
DTC Code
DTC Detection Condition
Trouble Area
C1411
C1412
One of the following conditions is met:
When the vehicle is driven in reverse at a speed of 3 km/h (2
...
