Toyota 4Runner: 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.
|
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
.gif)
).
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 | .gif) |
REPLACE HYDRAULIC BRAKE BOOSTER ASSEMBLY |
| C | |
GO TO STEP 4 |
| D | |
GO TO STEP 5 |
|
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|
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 |
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.
DTC Code
D ...
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.
DTC Code
D ...
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Inspection
INSPECTION
PROCEDURE
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NOTICE:
Do not disassemble the retractor.
(a) When the inclination of the retractor is 15° or less, check that the belt
can be pulled from the retractor. When the inclination of ...
Open in CAN Main Wire
DESCRIPTION
There may be an open circuit in the CAN main wire and/or DLC3 branch wire when
the resistance between terminals 6 (CANH) and 14 (CANL) of the DLC3 is 69 Ω or higher.
Symptom
Trouble Area
The resistance be ...
0.1062