DESCRIPTION
Refer to DTCs C1401 and C1402 (See page ).
DTC No. |
Detection Item |
DTC Detection Condition |
Trouble Area |
---|---|---|---|
C1405 |
Open or Short in Front Speed Sensor RH Circuit |
Either of the following is detected:
|
|
C1406 |
Open or Short in Front Speed Sensor LH Circuit |
Either of the following is detected:
|
|
HINT:
DTC will be output when conditions for either of the patterns in the table above are met.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
When replacing the skid control ECU (brake actuator assembly), perform zero point
calibration and store system information (See page
).
PROCEDURE
1. |
CHECK HARNESS AND CONNECTOR (MOMENTARY INTERRUPTION) |
(a) Using the Techstream, check for any momentary interruption in the wire harness
and connector corresponding to the DTC (See page
).
Tester Display |
Measurement Item |
Normal Condition |
Diagnostic Note |
---|---|---|---|
FR Speed Open |
Front speed sensor RH open circuit detection/ Error or Normal |
Normal |
Error: Momentary interruption |
FL Speed Open |
Front speed sensor LH open circuit detection/ Error or Normal |
Normal |
Error: Momentary interruption |
OK:
Normal (There are no momentary interruptions.)
HINT:
Perform the above inspection before removing the sensor and connector.
NG | ![]() |
GO TO STEP 4 |
|
2. |
READ VALUE USING TECHSTREAM (FRONT SPEED SENSOR) |
(a) Turn the ignition switch off.
(b) Connect the Techstream to the DLC3.
(c) Start the engine.
(d) Turn the Techstream on.
(e) Enter the following menus: Chassis / ABS/VSC/TRAC / Data List.
(f) According to the display on the Techstream, read the Data List.
ABS/VSC/TRAC
Tester Display |
Measurement Item |
Normal Condition |
Diagnostic Note |
---|---|---|---|
FR Wheel Speed |
Front wheel speed sensor RH reading/ Min.: 0 km/h (0 mph), Max.: 326 km/h (202 mph) |
Vehicle stopped: 0 km/h (0 mph) |
When driving at constant speed: No large fluctuations |
FL Wheel Speed |
Front wheel speed sensor LH reading/ Min.: 0 km/h (0 mph), Max.: 326 km/h (202 mph) |
Vehicle stopped: 0 km/h (0 mph) |
When driving at constant speed: No large fluctuations |
(g) Check that there is no difference between the speed value output from the speed sensor displayed on the Techstream and the speed value displayed on the speedometer when driving the vehicle.
HINT:
Factors that affect the indicated vehicle speed include tire size, tire inflation
and tire wear. The speed indicated on the speedometer has an allowable margin of
error. This can be tested using a speedometer tester (calibrated chassis dynamometer).
For details about testing and the margin of error, see the reference chart (See
page
).
OK:
The speed value output from the speed sensor displayed on the Techstream is the same as the actual vehicle speed measured using a speedometer tester (calibrated chassis dynamometer).
HINT:
If troubleshooting has been carried out according to the Problem Symptoms Table,
refer back to the table and proceed to the next step (See page
).
NG | ![]() |
GO TO STEP 4 |
|
3. |
RECONFIRM DTC |
(a) Clear the DTCs (See page
).
(b) Turn the ignition switch off.
(c) Start the engine.
(d) Perform a road test.
(e) Check if the same DTC is recorded (See page
).
Result |
Proceed to |
---|---|
DTCs C1405 and C1406 are not output |
A |
DTCs C1405 and/or C1406 are output |
B |
A | ![]() |
USE SIMULATION METHOD TO CHECK |
B | ![]() |
REPLACE BRAKE ACTUATOR ASSEMBLY |
4. |
INSPECT SKID CONTROL SENSOR WIRE |
(a) Remove the skid control sensor wire.
(b) Measure the resistance according to the value(s) in the table below.
*1 |
Skid Control Sensor Wire |
- |
- |
*a |
for RH |
*b |
for LH |
Standard Resistance:
for RH
Tester Connection |
Condition |
Specified Condition |
---|---|---|
Va1-1 - S4-1 (FR-) |
Always |
Below 1 Ω |
Va1-2 - S4-2 (FR+) |
Always |
Below 1 Ω |
Va1-1 - Va1-2 |
Always |
10 kΩ or higher |
Tester Connection |
Condition |
Specified Condition |
---|---|---|
Wa1-1 - S3-1 (FL-) |
Always |
Below 1 Ω |
Wa1-2 - S3-2 (FL+) |
Always |
Below 1 Ω |
Wa1-1 - Wa1-2 |
Always |
10 kΩ or higher |
NG | ![]() |
REPLACE SKID CONTROL SENSOR WIRE |
|
5. |
CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - FRONT SPEED SENSOR) |
(a) Turn the ignition switch off.
(b) Make sure that there is no looseness at the locking part and the connecting part of the connectors.
(c) Disconnect the S1 skid control ECU (brake actuator assembly) connector and the S4 and/or S3 front speed sensor connector.
(d) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
for RH
Tester Connection |
Condition |
Specified Condition |
---|---|---|
S1-31 (FR+) - S4-2 (FR+) |
Always |
Below 1 Ω |
S1-30 (FR-) - S4-1 (FR-) |
Always |
Below 1 Ω |
S1-31 (FR+) or S4-2 (FR+) - Body ground |
Always |
10 kΩ or higher |
S1-30 (FR-) or S4-1 (FR-) - Body ground |
Always |
10 kΩ or higher |
Tester Connection |
Condition |
Specified Condition |
---|---|---|
S1-18 (FL+) - S3-2 (FL+) |
Always |
Below 1 Ω |
S1-17 (FL-) - S3-1 (FL-) |
Always |
Below 1 Ω |
S1-18 (FL+) or S3-2 (FL+) - Body ground |
Always |
10 kΩ or higher |
S1-17 (FL-) or S3-1 (FL-) - Body ground |
Always |
10 kΩ or higher |
NG | ![]() |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
6. |
INSPECT BRAKE ACTUATOR ASSEMBLY (SENSOR OUTPUT) |
(a) Reconnect the S1 skid control ECU (brake actuator assembly) connector. |
|
(b) Turn the ignition switch to ON.
(c) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
for RH
Tester Connection |
Switch Condition |
Specified Condition |
---|---|---|
S4-2 (FR+) - Body ground |
Ignition switch ON |
8 to 14 V |
Tester Connection |
Switch Condition |
Specified Condition |
---|---|---|
S3-2 (FL+) - Body ground |
Ignition switch ON |
8 to 14 V |
*a |
Front view of wire harness connector (to Front Speed Sensor) |
*b |
for RH |
*c |
for LH |
OK | ![]() |
REPLACE FRONT SPEED SENSOR |
NG | ![]() |
REPLACE BRAKE ACTUATOR ASSEMBLY |
Diagnosis System
DIAGNOSIS SYSTEM
1. CHECK DLC3
(a) The vehicle's ECU uses the ISO 9141-2 for communication protocol. The terminal
arrangement of the DLC3 complies with SAE J1962 and matches the ISO 15765-4 format.
Symbols (Terminal No.)
Terminal Description
Condition
...
Replacement
REPLACEMENT
CAUTION / NOTICE / HINT
CAUTION:
Prolonged and repeated contact with engine oil will result in the removal
of natural oils from the skin, leading to dryness, irritation and dermatitis.
In addition, used engine oil contains potentially harmful contaminants which
may ...
Fuel Pump Ecu
Components
COMPONENTS
ILLUSTRATION
Removal
REMOVAL
PROCEDURE
1. PRECAUTION
NOTICE:
After turning the ignition switch off, waiting time may be required before disconnecting
the cable from the battery terminal. Therefore, make sure to read the disconnecting
the cable from the battery ...