Toyota 4Runner: Master Cylinder Pressure Sensor Zero Point High Malfunction (C1422)
DESCRIPTION
Refer to DTCs C1421, C1423 and C1424 (See page
.gif)
).
|
DTC Code |
DTC Detection Condition |
Trouble Area |
|---|---|---|
|
C1422 |
When the stop light switch assembly is off, the PM/C1 terminal voltage is 0.86 V or higher for 5 seconds or more. |
|
WIRING DIAGRAM
Refer to DTC C1380 (See page ).
CAUTION / NOTICE / HINT
NOTICE:
When replacing the master cylinder solenoid, perform calibration (See page
).
HINT:
When DTC C1425 is output together with DTC C1422, inspect and repair the trouble
areas indicated by DTC C1425 first (See page ).
PROCEDURE
|
1. |
CHECK STOP LIGHT OPERATION |
(a) Check that the stop lights come on when the brake pedal is depressed and go off when the brake pedal is released.
OK:
|
Condition |
Illumination Condition |
|---|---|
|
Brake pedal depressed |
On |
|
Brake pedal released |
Off |
| NG | .gif) |
INSPECT STOP LIGHT CIRCUIT |
|
.gif)
|
2. |
READ VALUE USING TECHSTREAM (STOP LIGHT SW) |
(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 |
|---|---|---|---|
|
Stop Light SW |
Stop light switch assembly/ ON or OFF |
ON: Brake pedal depressed OFF: Brake pedal released |
- |
(f) Check that the stop light condition observed on the Techstream changes according to brake pedal operation.
OK:
The Techstream displays ON or OFF according to brake pedal operation.
| NG | |
GO TO STEP 5 |
|
|
3. |
CHECK BRAKE PEDAL AND STOP LIGHT SWITCH INSTALLATION |
(a) Turn the ignition switch off.
(b) Check the brake pedal height and stop light switch assembly installation
(See page ).
OK:
The brake pedal height and stop light switch assembly installation are normal.
| NG | |
ADJUST BRAKE PEDAL OR STOP LIGHT SWITCH |
|
|
4. |
RECONFIRM DTC |
(a) Clear the DTCs (See page ).
(b) Start the engine.
(c) Drive the vehicle at a speed of 40 km/h (25 mph) or more and perform a braking test (decelerate the vehicle by depressing the brake pedal).
(d) Check if the same DTC is output (See page
).
|
Result |
Proceed to |
|---|---|
|
DTC C1422 is not output |
A |
|
DTC C1422 is output |
B |
| A | |
USE SIMULATION METHOD TO CHECK |
| B | |
REPLACE MASTER CYLINDER SOLENOID |
|
5. |
CHECK TERMINAL VOLTAGE (STP) |
| OK | |
REPLACE MASTER CYLINDER SOLENOID |
| NG | |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
Open or Short in Master Cylinder Pressure Sensor (C1421,C1281,C1423,C1424)
DESCRIPTION
DTC Code
DTC Detection Condition
Trouble Area
C1421
Either condition is met:
Both of the following conditions continue fo ...
Open in Stop Light Switch Circuit (C1425)
DESCRIPTION
The skid control ECU receives the stop light switch assembly signal and detects
the brake pedal operation status.
The skid control ECU has an open detection circuit, which stores this ...
Other materials about Toyota 4Runner:
Front passenger occupant classification system
Your vehicle is equipped with a front passenger occupant classification
system. This system detects the conditions of the front passenger seat and
activates or deactivates the devices for the front passenger.
1. SRS warning light
2. Front passenger’ ...
Disassembly
DISASSEMBLY
PROCEDURE
1. REMOVE NO. 1 ROOF SILENCER PAD (w/o Sliding Roof)
(a) Remove the No. 1 roof silencer pad.
2. REMOVE NO. 2 ROOF SILENCER PAD
(a) w/o Sliding Roof:
Remove the 2 No. 2 roof silencer pads.
(b) w/ Sliding Roof:
Remo ...
0.0267