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 |
---|---|---|
C1252 |
Motor operates for 5 minutes or more. |
|
WIRING DIAGRAM
CAUTION / NOTICE / HINT
HINT:
When C1253, C1254 or C1256 is output together with C1252, inspect and repair the trouble areas indicated by C1253, C1254 or C1256 first.
PROCEDURE
1. |
CHECK HYDRAULIC BRAKE BOOSTER PUMP MOTOR OPERATION |
(a) Turn the ignition switch to OFF.
(b) Depress the brake pedal more than 20 times.
(c) Turn the ignition switch to the ON position.
(d) Check how the hydraulic brake booster pump motor operates.
Result |
Proceed to |
---|---|
Pump motor does not operate |
A |
Pump motor operates continuously (Does not stop) |
B |
Pump motor operates intermittently |
C |
Pump motor operates, then stops |
D |
B | ![]() |
REPLACE HYDRAULIC BRAKE BOOSTER |
C | ![]() |
GO TO STEP 4 |
D | ![]() |
GO TO STEP 5 |
|
2. |
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 | ![]() |
RETIGHTEN SCREWS |
|
3. |
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 assembly. |
|
(b) Measure the resistance between the red wire (MT+) and black wire (MT-).
Resistance:
2 Ω
NG | ![]() |
REPLACE HYDRAULIC BRAKE BOOSTER |
|
4. |
READ VALUE USING DATA LIST (ACCUMULATOR SENSOR) |
(a) Connect Techstream to the DLC3.
(b) Turn the ignition switch to the ON position.
(c) Turn Techstream ON.
(d) 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 |
If value constant regardless of pump operation, accumulator pressure sensor malfunction suspected. |
(e) Check that the accumulator pressure sensor output is normal.
Result |
Proceed to |
---|---|
Output value varies within "Normal Condition" range |
A |
Output value does not reach "Normal Condition" range |
B |
Output value constant regardless of pump motor operation |
C |
B | ![]() |
REPLACE MASTER CYLINDER SOLENOID |
C | ![]() |
REPLACE HYDRAULIC BRAKE BOOSTER |
|
5. |
RECONFIRM DTC |
(a) Clear the DTCs (See page
).
(b) Turn the ignition switch to OFF.
(c) Turn the ignition switch to the ON position.
(d) Wait for more than 5 minutes.
(e) Check if the same DTCs are recorded.
Result |
Proceed to |
---|---|
DTC output |
A |
DTC not output |
B |
A | ![]() |
REPLACE MASTER CYLINDER SOLENOID |
B | ![]() |
REPLACE HYDRAULIC BRAKE BOOSTER |
Room Oscillator does not Recognize Key
DESCRIPTION
If code verification cannot be performed in the vehicle interior, there may be
problems with the communication between the vehicle (indoor electrical key antenna
assembly (front floor) or (rear floor)) and electrical key transmitter sub-assembly,
or the certification ECU (smart ke ...
Problem Symptoms Table
PROBLEM SYMPTOMS TABLE
HINT:
Use the table below to help determine the cause of problem symptoms.
If multiple suspected areas are listed, the potential causes of the symptoms
are listed in order of probability in the "Suspected Area" column of the
table. Check each sy ...
Diagnostic Trouble Code Chart
DIAGNOSTIC TROUBLE CODE CHART
Smart Key System
DTC Code
Detection Item
See page
B27A1
Open in Driver Side Electrical Antenna Circuit
B27A5
Open in Front Floor Electrical Key Oscillator Circuit
...