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 |
System Description
SYSTEM DESCRIPTION
1. DESCRIPTION OF SYSTEM
(a) When the tire pressure warning system detects that the tire pressure of a
tire is below the threshold, it illuminates the tire pressure warning light to warn
the driver.
(b) The tire pressure warning anten ...
Installation
INSTALLATION
CAUTION / NOTICE / HINT
HINT:
Use the same procedure for the RH and LH sides.
The procedure listed below is for the LH side.
A bolt without a torque specification is shown in the standard bolt
chart (See page ).
PROC ...