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.
DTC Code |
DTC Detection Condition |
Trouble Area |
---|---|---|
C1252 |
The motor operates for 3 minutes or more. |
|
HINT:
The pump motor continues operation for the first 3 minutes, and then starts and stops repeatedly.
CAUTION / NOTICE / HINT
NOTICE:
When replacing the master cylinder solenoid, perform calibration (See page ).
HINT:
When DTC C1253, C1254, C1256 or C1452 is output together with DTC C1252, inspect and repair the trouble area indicated by DTC C1253, C1254, C1256 or C1452 first.
PROCEDURE
1. |
CHECK PUMP MOTOR OPERATION |
(a) Turn the ignition switch off.
(b) Depress the brake pedal more than 40 times.
(c) Turn the ignition switch to ON.
(d) Check how the pump motor operates.
Result
Result |
Proceed to |
---|---|
Pump motor does not operate |
A |
Pump motor operates continuously and does not stop |
B |
Pump motor operates intermittently |
C |
Pump motor operates, and then stops |
D |
B |
REPLACE HYDRAULIC BRAKE BOOSTER ASSEMBLY |
C |
GO TO STEP 4 |
D |
GO TO STEP 5 |
|
2. |
CHECK CONNECTION OF PUMP MOTOR WIRE HARNESS |
NG |
RETIGHTEN SCREWS |
|
3. |
CHECK RESISTANCE OF PUMP MOTOR WIRE HARNESS |
NG |
REPLACE BRAKE BOOSTER WITH ACCUMULATOR PUMP ASSEMBLY |
|
4. |
READ VALUE USING TECHSTREAM (ACCUMULATOR SENSOR) |
(a) Turn the ignition switch off.
(b) Connect the Techstream to the DLC3.
(c) Turn the ignition switch to ON.
(d) Turn the Techstream on.
(e) Enter the following menus: Chassis / ABS/VSC/TRAC / Data List.
ABS/VSC/TRAC
Tester Display |
Measurement Item/Range |
Normal Condition |
Diagnostic Note |
---|---|---|---|
Accumulator Sensor |
Accumulator pressure sensor reading/ Min.: 0.00 V, Max.: 5.00 V |
3.58 to 5 V |
If the value is constant regardless of the pump operation, an accumulator pressure sensor malfunction is suspected. |
(f) Check the accumulator output value.
Result
Result |
Proceed to |
---|---|
Output value is within "Normal Condition" range |
A |
Output value is out of "Normal Condition" range |
B |
Output value is constant regardless of pump operation |
C |
B |
REPLACE MASTER CYLINDER SOLENOID |
C |
REPLACE HYDRAULIC BRAKE BOOSTER ASSEMBLY |
|
5. |
RECONFIRM DTC |
(a) Clear the DTCs (See page ).
(b) Turn the ignition switch off.
(c) Turn the ignition switch to ON.
(d) Wait for more than 5 minutes.
(e) 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 HYDRAULIC BRAKE BOOSTER ASSEMBLY |
B |
REPLACE BRAKE BOOSTER WITH ACCUMULATOR PUMP ASSEMBLY |
Park / Neutral Position Switch Circuit
DESCRIPTION
This circuit sends the park/neutral position switch assembly signals to the clearance
warning ECU assembly.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
Inspect the fuses for circuits related to this system before performing the followin ...
Trouble in Passenger Airbag ON/OFF Indicator
DESCRIPTION
The occupant classification system detects the front passenger seat condition.
The system then informs the passenger of the front passenger airbag assembly and
front passenger side knee airbag status (activated/not activated) with the passenge ...