DTC    C1407    Open or Short in Rear Speed Sensor RH Circuit
DTC    C1408    Open or Short in Rear Speed Sensor LH Circuit

DESCRIPTION

HINT:

1. DTC C1407 is for the rear speed sensor RH.
   
2. DTC C1408 is for the rear speed sensor LH.
   

WIRING DIAGRAM

INSPECTION PROCEDURE

NOTICE:

Disassembly of the rear speed sensor from the rear axle hub and bearing assembly is prohibited.

1. Using the Techstream, check for any momentary interruption in the wire harness and connector corresponding to the DTC (Click here).
   
   

   ABS/VSC/TRAC 

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   RR Speed Open	RR speed sensor open detection / Normal or Error	Normal: Normal Error: Momentary interruption	-
   RL Speed Open	RL speed sensor open detection / Error or Normal or Error	Normal: Normal Error: Momentary interruption	-

   OK:

   There are no momentary interruptions.
   

   HINT:

   Perform the above inspection before removing the sensor and connector.

NG	Go to step 4

OK

1. Connect the Techstream to the DLC3.
   

2. Start the engine.
   

3. Enter the following menus: Chassis / ABS/VSC/TRAC / Data List.
   
   

   ABS/VSC/TRAC (Skid Control ECU) 

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   RR Wheel Speed	RR wheel speed sensor reading / min.: 0 km/h (0 mph), max.: 326 km/h (202 mph)	Vehicle stopped: 0 km/h	When driving at constant speed: No large fluctuations
   RL Wheel Speed	RL wheel speed sensor reading / min.: 0 km/h (0 mph), max.: 326 km/h (202 mph)	Vehicle stopped: 0 km/h	When driving at constant speed: No large fluctuations

4. 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 (Click here).

   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).
   

   NOTICE:

   Check the speed sensor signal after replacement (Click here).

   HINT:

   1. The rear speed sensor rotor is incorporated into the rear axle hub and bearing assembly.
      If the rear speed sensor rotor needs to be replaced, replace it together with the rear axle hub and bearing assembly with rear speed sensor.
      
   2. If troubleshooting has been carried out according to the Problem Symptoms Table, refer back to the table and proceed to the next step (Click here).
      

NG	Go to step 4

OK

1. Turn the ignition switch off.
   

2. Clear the DTCs (Click here).
   

3. Start the engine.
   

4. Drive the vehicle at a speed of 40 km/h (25 mph) or more for at least 60 seconds.
   

5. Check if the same DTC is recorded (Click here).
   

HINT:

If troubleshooting has been carried out according to the Problem Symptoms Table, refer back to the table and proceed to the next step (Click here).

B	REPLACE BRAKE ACTUATOR ASSEMBLY (Click here)

A
CHECK FOR INTERMITTENT PROBLEMS (SYMPTOM SIMULATION) (Click here)

1. Turn the ignition switch off.
   

2. Make sure that there is no looseness at the locking part and the connecting part of the connectors.
   

3. Disconnect the skid control sensor wire connectors.
   

4. Measure the resistance according to the value(s) in the table below.
   

   Standard Resistance (RH):

   Tester Connection	Condition	Specified Condition
   a10-2(+) - aJ3-1	Always	Below 1 Ω
   a10-1(-) - aJ3-2	Always	Below 1 Ω
   a10-2(+) - aJ3-2	Always	10 kΩ or higher
   a10-2(+) - Body ground	Always	10 kΩ or higher
   a10-1(-) - aJ3-1	Always	10 kΩ or higher
   a10-1(-) - Body ground	Always	10 kΩ or higher

   Standard Resistance (LH):

   Tester Connection	Condition	Specified Condition
   d10-2(+) - dJ2-1	Always	Below 1 Ω
   d10-1(-) - dJ2-2	Always	Below 1 Ω
   d10-2(+) - dJ2-2	Always	10 kΩ or higher
   d10-2(+) - Body ground	Always	10 kΩ or higher
   d10-1(-) - dJ2-1	Always	10 kΩ or higher
   d10-1(-) - Body ground	Always	10 kΩ or higher

   NOTICE:

   Check the speed sensor signal after replacement (Click here).

5. Reconnect the skid control sensor wire connector.
   

NG	REPLACE SKID CONTROL SENSOR WIRE

OK

1. Turn the ignition switch off.
   

2. Make sure that there is no looseness at the locking part and the connecting part of the connectors.
   

3. Disconnect the skid control ECU connector and the rear speed sensor connector.
   

4. Measure the resistance according to the value(s) in the table below.
   

   Standard Resistance:

   Tester Connection	Condition	Specified Condition
   A71-17 (RR+) - a10-2 (+)	Always	Below 1 Ω
   A71-16 (RR-) - a10-1 (-)	Always	Below 1 Ω
   A71-5 (RL+) - d10-2 (+)	Always	Below 1 Ω
   A71-4 (RL-) - d10-1 (-)	Always	Below 1 Ω
   A71-17 (RR+) - Body ground	Always	10 kΩ or higher
   A71-16 (RR-) - Body ground	Always	10 kΩ or higher
   A71-5 (RL+) - Body ground	Always	10 kΩ or higher
   A71-4 (RL-) - Body ground	Always	10 kΩ or higher

5. Reconnect the skid control ECU connector.
   

NG	REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

1. Turn the ignition switch to ON.
   

2. Measure the voltage according to the value(s) in the table below.
   

   Standard Voltage:

   Tester Connection	Switch Condition	Specified Condition
   a10-2 (+) - Body ground	Ignition switch ON	8 to 14 V
   d10-2 (+) - Body ground	Ignition switch ON	8 to 14 V

   NOTICE:

   Check the speed sensor signal after replacement (Click here).

   HINT:

   If troubleshooting has been carried out according to the Problem Symptoms Table, refer back to the table and proceed to the next step (Click here).

3. Reconnect the rear speed sensor connector.
   

NG	REPLACE BRAKE ACTUATOR ASSEMBLY (Click here)

OK
REPLACE REAR AXLE HUB AND BEARING ASSEMBLY (Click here)