Dtc C1405 Open Or Short In Front Speed Sensor Rh Circuit

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

READ VALUE USING TECHSTREAM (MOMENTARY INTERRUPTION)

READ VALUE USING TECHSTREAM (FRONT SPEED SENSOR)

RECONFIRM DTC

CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - FRONT SPEED SENSOR)

CHECK BRAKE ACTUATOR ASSEMBLY (SENSOR INPUT)

DESCRIPTION

HINT:

1. DTC C1405 is for the front speed sensor RH.
   
2. DTC C1406 is for the front speed sensor LH.
   

WIRING DIAGRAM

INSPECTION PROCEDURE

NOTICE:

Check the speed sensor signal after replacement (YARIS_NCP93 RM000000XHT08IX.html).

1. Using the Techstream, check for any momentary interruption in the wire harness and connector corresponding to the DTC (YARIS_NCP93 RM000000XHS09YX.html).
   
   

   ABS/VSC/TRC

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

   OK:

   There are no momentary interruptions.
   

   HINT:

   Perform the above inspection before removing the sensor and connector.

1. Turn the ignition switch off.
   

2. Connect the Techstream to the DLC3.
   

3. Turn the ignition switch to ON.
   

4. Turn the Techstream on.
   

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

6. According to the display on the Techstream, read the Data List.
   
   

   ABS/VSC/TRAC

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   FR Wheel Speed	FR 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
   FL Wheel Speed	FL 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

7. 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.

   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 (YARIS_NCP93 RM000000XHN0AXX.html).

1. Turn the ignition switch off.
   

2. Clear the DTCs (YARIS_NCP93 RM000000XHV0BQX.html).
   

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 (YARIS_NCP93 RM000000XHV0BQX.html).
   

   Result

   Result	Proceed to
   DTCs (C1405 and C1406) are not output	A
   DTCs (C1405 and/or C1406) are output	B

HINT:

If troubleshooting has been carried out according to the Problem Symptoms Table, refer back to the table and proceed to the next step (YARIS_NCP93 RM000000XHN0AXX.html).

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 A30 brake actuator assembly (skid control ECU) connector and the A7 and/or A11 front speed sensor connector.
   

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

   Standard Resistance:

   Tester Connection	Condition	Specified Condition
   A30-7 (FR+) - A7-2 (FR+)	Always	Below 1 Ω
   A30-6 (FR-) - A7-1 (FR-)	Always	Below 1 Ω
   A30-19 (FL+) - A11-2 (FL+)	Always	Below 1 Ω
   A30-18 (FL-) - A11-1 (FL-)	Always	Below 1 Ω
   A30-7 (FR+) - Body ground	Always	10 kΩ or higher
   A30-6 (FR-) - Body ground	Always	10 kΩ or higher
   A30-19 (FL+) - Body ground	Always	10 kΩ or higher
   A30-18 (FL-) - Body ground	Always	10 kΩ or higher

5. Reconnect the A30 brake actuator assembly (skid control ECU) connector and the front speed sensor connector.
   

1. Turn the ignition switch to ON.
   

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

   Standard Voltage:

   RH:

   Tester Connection	Switch Condition	Specified Condition
   A7-2 (FR+) - Body ground	Ignition switch ON	8 to 14 V

   LH:

   Tester Connection	Switch Condition	Specified Condition
   A11-2 (FL+) - Body ground	Ignition switch ON	8 to 14 V

   Text in Illustration

   *a	Front view of wire harness connector (to Front Speed Sensor)
   *b	RH
   *c	LH

   HINT:

   If troubleshooting has been carried out according to the Problem Symptoms Table, refer back to the table and proceed to the next step (YARIS_NCP93 RM000000XHN0AXX.html).