Toyota Tacoma (2015-2018) Service Manual: Pressure Sensor or Switch (C1254)
DESCRIPTION
The accumulator pressure sensor is connected to the skid control ECU in the master cylinder solenoid.
|
DTC No. |
DTC Detecting Condition |
Trouble Areas |
|---|---|---|
|
C1254 |
Accumulator pressure sensor fault (Fluid pressure does not change when it should e.g. pump operates, brake pedal depressed/released). |
|
PROCEDURE
|
1. |
READ VALUE USING DATA LIST (ACCUMULATOR SENSOR) |
(a) Connect Techstream to the DLC3.
(b) Turn the ignition switch to OFF.
(c) Depress the brake pedal more than 20 times.
(d) Turn the ignition switch to the ON position.
(e) Select the Data List mode on the Techstream.
ABS/VSC/TRAC|
Tester Display |
Measurement Item / Range |
Normal Condition |
Diagnostic Note |
|---|---|---|---|
|
Accumulator Sensor |
Accumulator pressure sensor reading / min.: 0 V, max.: 5 V |
3.58 to 5 V |
- |
(f) Confirm whether the accumulator output voltage is normal.
|
Result |
Proceed to |
|---|---|
|
Output value normal |
A |
|
Output value not normal |
B |
| B | .gif) |
REPLACE MASTER CYLINDER SOLENOID |
|
.gif)
|
2. |
READ VALUE USING DATA LIST (MASTER CYLINDER PRESSURE SENSOR) |
(a) Turn the ignition switch to OFF.
(b) Depress the brake pedal more than 20 times.
(c) Install a brake pedal effort gauge (SST), and bleed air.
(d) Connect Techstream to the DLC3.
(e) Turn the ignition switch to the ON position.
(f) Select the Data List mode on the Techstream.
ABS/VSC/TRAC|
Tester Display |
Measurement Item / Range |
Normal Condition |
Diagnostic Note |
|---|---|---|---|
|
Master Cylinder Sensor |
Master cylinder pressure sensor reading / min.: 0 V, max.: 5 V |
0.3 to 1.9 V With pedal pressure of 49 N (5 kgf, 11 lbf) |
Front brake pressure: 770 to 1280 kPa (7.9 to 13.1 kgf/cm2, 112 to 186 psi) |
(g) Check that the master cylinder output value is in the Normal Condition range.
OK:
Master cylinder pressure sensor value is in the Normal Condition.
| NG | |
REPLACE MASTER CYLINDER SOLENOID |
|
|
3. |
RECONFIRM DTC |
(a) Clear the DTCs (See page .gif)
).
(b) Turn the ignition switch to OFF.
(c) Depress the brake pedal more than 20 times.
(d) Turn the ignition switch to the ON position.
(e) Wait until the pump motor stops.
(f) Depress the brake pedal and release it.
(g) Wait for 25 minutes.
(h) Check if the same DTCs are recorded.
|
Result |
Proceed to |
|---|---|
|
DTC output |
A |
|
DTC not output |
B |
| A | |
REPLACE MASTER CYLINDER SOLENOID |
| B | |
END |
Pump Motor Relay (C1253)
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).
...
Accumulator Low Pressure (C1256)
DESCRIPTION
The accumulator pressure sensor is connected to the skid control ECU in the master
cylinder solenoid.
DTC No.
DTC Detecting Condition
Trouble Areas
...
Other materials:
Radio Receiver Assembly Communication Stop Mode
DESCRIPTION
Detection Item
Symptom
Trouble Area
Radio Receiver Assembly Communication Stop Mode
Either condition is met:
Communication stop for "Display and Navigation (AVN1)" is indicated
on the "Commun ...
Problem Symptoms Table
PROBLEM SYMPTOMS TABLE
HINT:
If a problem occurs in certain locations or at certain times of day,
check for the possibility of wave interference.
When the electrical key transmitter sub-assembly is brought near the
electrical key and TPMS receiver assembly (RF band), front outs ...
Diagnosis System
DIAGNOSIS SYSTEM
1. DESCRIPTION
(a) The transponder key ECU assembly controls the engine immobiliser system.
The engine immobiliser system data and Diagnostic Trouble Codes (DTCs) can be read
through the vehicle Data Link Connector 3 (DLC3).
2. CHECK DLC3
(a) Check the DLC3 (See page ).
3. ...
