DESCRIPTION
Refer to DTCs C1401 and C1402 (See page ).
DTC Code |
DTC Detection Condition |
Trouble Area |
---|---|---|
C1407 C1408 |
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 |
---|---|---|---|
RR Speed Open |
Rear speed sensor RH open detection/ Error or Normal |
Normal |
- |
RL Speed Open |
Rear 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 (REAR 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 C1407 and C1408 are not output |
A |
DTCs C1407 and/or C1408 are output |
B |
A | ![]() |
USE SIMULATION METHOD TO CHECK |
B | ![]() |
REPLACE MASTER CYLINDER SOLENOID |
4. |
INSPECT SKID CONTROL SENSOR WIRE |
*A |
for RH |
*B |
for LH |
*1 |
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
Tester Connection |
Condition |
Specified Condition |
---|---|---|
Qz1-4 - z7-2 (RR+) |
Always |
Below 1 Ω |
Qz1-3 - z7-1 (RR-) |
Always |
Below 1 Ω |
Qz1-4 - Qz1-3 |
Always |
10 kΩ or higher |
Qz1-4 - Qz1-1 |
Always |
10 kΩ or higher |
Qz1-4 - Qz1-2 |
Always |
10 kΩ or higher |
Tester Connection |
Condition |
Specified Condition |
---|---|---|
Qz1-2 - z8-2 (RL+) |
Always |
Below 1 Ω |
Qz1-1 - z8-1 (RL-) |
Always |
Below 1 Ω |
Qz1-2 - Qz1-1 |
Always |
10 kΩ or higher |
Qz1-2 - Qz1-3 |
Always |
10 kΩ or higher |
Qz1-2 - Qz1-4 |
Always |
10 kΩ or higher |
NG | ![]() |
REPLACE SKID CONTROL SENSOR WIRE |
|
5. |
CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - REAR SPEED SENSOR) |
(a) Install the skid control sensor wire.
(b) Disconnect the A6 skid control ECU connector.
(c) Disconnect the z7 and/or z8 rear 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 |
---|---|---|
A6-5 (RR+) - z7-2 (RR+) |
Always |
Below 1 Ω |
A6-5 (RR+) - Body ground |
Always |
10 kΩ or higher |
A6-19 (RR-) - z7-1 (RR-) |
Always |
Below 1 Ω |
A6-19 (RR-) - Body ground |
Always |
10 kΩ or higher |
Tester Connection |
Condition |
Specified Condition |
---|---|---|
A6-20 (RL+) - z8-2 (RL+) |
Always |
Below 1 Ω |
A6-20 (RL+) - Body ground |
Always |
10 kΩ or higher |
A6-6 (RL-) - z8-1 (RL-) |
Always |
Below 1 Ω |
A6-6 (RL-) - Body ground |
Always |
10 kΩ or higher |
NG | ![]() |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
6. |
CHECK TERMINAL VOLTAGE (RR+, RL+) |
(a) Disconnect the z7 and/or z8 rear 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 REAR SPEED SENSOR |
NG | ![]() |
REPLACE MASTER CYLINDER SOLENOID |
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" ...
System Description
SYSTEM DESCRIPTION
1. KEY REMINDER WARNING SYSTEM DESCRIPTION
(a) When the driver side door is opened while the ignition switch is ACC or off
and the key is in the ignition key cylinder, this system causes a buzzer to sound
in order to warn the driver th ...