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 |
---|---|---|
C1253 |
There is a motor system circuit (motor input circuit) malfunction. |
|
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
PROCEDURE
1. |
PERFORM ACTIVE TEST USING TECHSTREAM (MOTOR RELAY) |
(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) Start the engine.
(f) Enter the following menus: Chassis / ABS/VSC/TRAC / Active Test.
ABS/VSC/TRAC
Tester Display |
Test Part |
Control Range |
Diagnostic Note |
---|---|---|---|
Motor Relay |
Motor relay |
Relay ON/OFF |
An operating sound of the motor can be heard. |
(g) Check the operating sound of the motor individually when operating it with the Techstream.
OK:
An operating sound of the motor can be heard.
NG | ![]() |
GO TO STEP 3 |
|
2. |
RECONFIRM DTC |
(a) Clear the DTCs (See page ).
(b) Turn the ignition switch off.
(c) Depress the brake pedal more than 40 times.
(d) Turn the ignition switch to ON.
(e) Wait until the pump motor stops.
(f) Depress the brake pedal several times until the pump motor turns on. (Procedure A)
(g) Wait until the pump stops. (Procedure B)
(h) Repeat the above steps (procedure A and B) 3 more times.
(i) 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 MASTER CYLINDER SOLENOID |
B | ![]() |
USE SIMULATION METHOD TO CHECK |
3. |
CHECK TERMINAL VOLTAGE (+BM1, +BM2) |
(a) Disconnect the A6 and A7 skid control ECU connectors.
(b) Measure the voltage according to the value(s) in the table below. Standard Voltage:
|
|
NG | ![]() |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
4. |
CHECK HARNESS AND CONNECTOR (GND1, GND2 AND GND3 TERMINAL) |
NG | ![]() |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
5. |
RECONFIRM DTC |
(a) Clear the DTCs (See page ).
(b) Turn the ignition switch off.
(c) Depress the brake pedal more than 40 times.
(d) Turn the ignition switch to ON.
(e) Wait until the pump motor stops.
(f) Depress the brake pedal several times until the pump motor turns on. (Procedure A)
(g) Wait until the pump stops. (Procedure B)
(h) Repeat the above steps (procedure A and B) 3 more times.
(i) 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 MASTER CYLINDER SOLENOID |
B | ![]() |
USE SIMULATION METHOD TO CHECK |
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" ...
Installation
INSTALLATION
CAUTION / NOTICE / HINT
CAUTION:
Wear protective gloves. Sharp areas on the parts may injure your hands.
HINT:
A bolt without a torque specification is shown in the standard bolt chart (See
page ).
PROCEDURE
1. INSTALL REAR SEAT CUSHION ...