Toyota Tacoma (2015-2018) Service Manual: 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).
|
DTC No. |
DTC Detecting Condition |
Trouble Areas |
|---|---|---|
|
C1251 |
Open in motor system circuit (motor input circuit) |
Hydraulic brake booster pump motor circuit |
WIRING DIAGRAM
CAUTION / NOTICE / HINT
HINT:
Remove the hydraulic brake booster before the inspection (See page
.gif)
).
PROCEDURE
|
1. |
CHECK BRAKE PUMP MOTOR WIRE HARNESS CONNECTION (MT+ / MT-) |
(a) Using a screwdriver, remove the 2 plugs from the hydraulic brake booster
(See page ).
(b) Check the tightening torque of 2 screws which fasten the wire harness connecting
hydraulic brake booster and brake booster pump (See page
).
Torque:
2.9 N·m {30 kgf·cm, 26 in·lbf}
| NG | .gif) |
RETIGHTEN SCREWS |
|
.gif)
|
2. |
CHECK RESISTANCE OF PUMP MOTOR WIRE HARNESS (MT+/MT-) |
|
(a) Using a screwdriver, remove the 2 screws and pull the wire harness from the hydraulic brake booster. |
|
(b) Measure the resistance between the red wire (MT+) and black wire (MT-).
Resistance:
2 Ω
| NG | |
REPLACE HYDRAULIC BRAKE BOOSTER |
|
|
3. |
RECONFIRM DTC |
(a) Reassemble the hydraulic brake booster, then reinstall the hydraulic brake booster.
(b) Clear the DTCs (See page
).
(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 |
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 funct ...
Brake Booster Pump Motor on Time Abnormally Long (C1252)
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:
XM Tuner Antenna Disconnected (B15FE,B15FF)
DESCRIPTION
These DTCs are stored when a malfunction occurs in the antenna assembly with
holder which is connected to the navigation receiver assembly assembly.
DTC No.
DTC Detection Condition
Trouble Area
B15FE
The antenna assembly wi ...
Wireless remote control*
The wireless remote control can be used to lock and unlock the vehicle from outside
the vehicle.
Locks all doors
Unlocks all doors
Pressing the button unlocks the driver’s door. Pressing the button again within
3 seconds unlocks the other doors.
Sounds alarm (push and hold)
■Op ...
Clutch Start Cancel Switch
Inspection
INSPECTION
PROCEDURE
1. INSPECT CLUTCH START CANCEL SWITCH ASSEMBLY
(a) Using an ohmmeter, check that there is resistance between terminals
2 and 4.
Standard:
10 kΩ or higher
If the result is not as specified, replace the clutch start cancel switch.
...
