DESCRIPTION
Refer to DTCs C1401 and C1402 (See page ).
DTC Code |
DTC Detection Condition |
Trouble Area |
---|---|---|
C1405 C1406 |
Either condition is met:
|
|
HINT:
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
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/Range |
Normal Condition |
Diagnostic Note |
---|---|---|---|
FR Speed Open |
Front speed sensor RH open detection/ Error or Normal |
Normal |
- |
FL Speed Open |
Front speed sensor LH open detection/ Error or Normal |
Normal |
- |
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) |
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) Drive the vehicle at a speed of 40 km/h (25 mph) or more for at least 60 seconds.
(e) Check if the same DTC is output (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 MASTER CYLINDER SOLENOID |
4. |
INSPECT SKID CONTROL SENSOR WIRE |
(a) Remove the skid control sensor wire (See page
).
(b) Measure the resistance according to the value(s) in the table below. Standard Resistance: for RH
|
|
NG | ![]() |
REPLACE SKID CONTROL SENSOR WIRE |
|
5. |
CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - FRONT SPEED SENSOR) |
(a) Install the skid control sensor wire.
(b) Disconnect the A6 skid control ECU connector.
(c) Disconnect the z5 and/or z6 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 |
---|---|---|
A6-3 (FR+) - z5-2 (FR+) |
Always |
Below 1 Ω |
A6-3 (FR+) - Body ground |
Always |
10 kΩ or higher |
A6-17 (FR-) - z5-1 (FR-) |
Always |
Below 1 Ω |
A6-17 (FR-) - Body ground |
Always |
10 kΩ or higher |
Tester Connection |
Condition |
Specified Condition |
---|---|---|
A6-18 (FL+) - z6-2 (FL+) |
Always |
Below 1 Ω |
A6-18 (FL+) - Body ground |
Always |
10 kΩ or higher |
A6-4 (FL-) - z6-1 (FL-) |
Always |
Below 1 Ω |
A6-4 (FL-) - Body ground |
Always |
10 kΩ or higher |
NG | ![]() |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
6. |
CHECK TERMINAL VOLTAGE (FR+, FL+) |
(a) Disconnect the z5 and/or z6 front speed sensor connector.
(b) Connect the A6 skid control ECU connector.
(c) Measure the voltage according to the value(s) in the table below. Standard Voltage: for RH
|
|
OK | ![]() |
REPLACE FRONT SPEED SENSOR |
NG | ![]() |
REPLACE MASTER CYLINDER SOLENOID |
Inspection
INSPECTION
PROCEDURE
1. INSPECT DOOR CONTROL TRANSMITTER MODULE
(a) Inspect the operation of the transmitter.
(1) Remove the battery (lithium battery) from the transmitter (See page
).
(2) Install a new or normal battery (lithium battery).
...
If you think something is wrong
If you notice any of the following symptoms, your vehicle probably needs
adjustment or repair. Contact your Toyota dealer as soon as possible.
Visible symptoms
• Fluid leaks under the vehicle (Water dripping from the air
conditioning after use is norm ...