Lexus ES: Front Speed Sensor RH Circuit Output (C1413,C1414)

DESCRIPTION

Each speed sensor detects the wheel speed and sends the signals to the skid control ECU (brake booster with master cylinder assembly). These signals are used for ABS control.

HINT:

The output voltage values shown below are for when the vehicle wire harnesses are connected to the skid control ECU (brake booster with master cylinder assembly) and the speed sensors.

DTC No.	Detection Item	INF Code	DTC Detection Condition	Trouble Area	MIL	Note
C1413	Front Speed Sensor RH Circuit Output	504 541	INF Code: 504 An open in the sensor signal of a malfunctioning wheel occurs 255 times or more. INF Code: 541 Either of the following is detected: At a vehicle speed of 20 km/h (12 mph) or more, noise occurs in the sensor signals of a malfunctioning wheel 75 times or more within 5 seconds. At a vehicle speed of 10 km/h (6 mph) or more, noise occurs once per rotor rotation for 15 seconds or more.	Front speed sensor RH Speed sensor installed improperly Wire harness or connector Front speed sensor rotor RH (front axle hub sub-assembly RH) Skid control ECU (brake booster with master cylinder assembly)	Comes on	INF Code 504: SAE Code C050A (Case 2) INF Code 541: SAE Code C050A (Case 1) ABS DTC
C1414	Front Speed Sensor LH Circuit Output	514 542	INF Code: 514 An open in the sensor signal of a malfunctioning wheel occurs 255 times or more. INF Code: 542 Either of the following is detected: At a vehicle speed of 20 km/h (12 mph) or more, noise occurs in the sensor signals of a malfunctioning wheel 75 times or more within 5 seconds. At a vehicle speed of 10 km/h (6 mph) or more, noise occurs once per rotor rotation for 15 seconds or more.	Front speed sensor LH Speed sensor installed improperly Wire harness or connector Front speed sensor rotor LH (front axle hub sub-assembly LH) Skid control ECU (brake booster with master cylinder assembly)	Comes on	INF Code 514: SAE Code C0504 (Case 2) INF Code 542: SAE Code C0504 (Case 1) ABS DTC

MONITOR DESCRIPTION

The skid control ECU (brake booster with master cylinder assembly) monitors the output value of the speed sensors. When the vehicle is being driven and a sudden irregular change in acceleration due to iron particles being attached to the speed sensor is detected repeatedly, or periodic sudden changes in acceleration due to iron particles being attached to the speed sensor rotor is detected, the skid control ECU (brake booster with master cylinder assembly) judges that speed sensor noise is occurring and illuminates the MIL and stores a DTC.

Also, when the vehicle is being driven and the output value of the speed sensor is momentarily interrupted repeatedly, the skid control ECU (brake booster with master cylinder assembly) judges that there is a momentary interruption in the speed sensor circuit and illuminates the MIL and stores a DTC.

MONITOR STRATEGY

Related DTCs	C0504 (Case 1): Speed sensor intermittent/erratic C0504 (Case 2): Speed sensor intermittent/erratic C050A (Case 1): Speed sensor intermittent/erratic C050A (Case 2): Speed sensor intermittent/erratic
Required Sensors/Components(Main)	Speed sensor Speed sensor rotor
Required Sensors/Components(Related)	Speed sensor
Frequency of Operation	Continuous
Duration	-: C0504 (Case 1) and C050A (Case 1) 255 times: C0504 (Case 2) and C050A (Case 2)
MIL Operation	Immediately
Sequence of Operation	None

TYPICAL ENABLING CONDITIONS

All

Monitor runs whenever the following DTCs are not stored

C0501, C0507, C050D, C0513 (Speed sensor range/performance) C0502, C0508, C050E, C0514 (Speed sensor circuit low) C0503, C0509, C050F, C0515 (Speed sensor circuit high) C140B, C140C, C140D, C140E (2 wheel speed sensors malfunction) C14E1, C14E4, C14E7, C14EA (Case 1) (Speed sensor voltage circuit low) C14E1, C14E4, C14E7, C14EA (Case 2) (Speed sensor voltage circuit low)

C0504 and C050A (Case 1)

Speed sensor fail (C0501, C0502, C0503, C0507, C0508, C0509, C050D, C050E, C050F, C0513, C0514, C0515, C140B, C140C, C140D, C140E, C14E1, C14E4, C14E7, C14EA)

Not detected

C0504 and C050A (Case 2)

All of the following conditions are met	-
Brake system voltage 1 (VM1)	Less than 16.44 V
Speed sensor pulse	No signal
Wheels are not locked	Met
Vehicle speed	15 km/h (9 mph) or more
Speed sensor fail (C0501, C0502, C0503, C0507, C0508, C0509, C050D, C050E, C050F, C0513, C0514, C0515, C140B, C140C, C140D, C140E, C14E1, C14E4, C14E7, C14EA)	Not detected

TYPICAL MALFUNCTION THRESHOLDS

C0504 and C050A (Case 1)

Either of the following conditions is met	-
Speed sensor noise	Exist
Speed sensor a piece of metal rotor noise	Exist

C0504 and C050A (Case 2)

Edge of speed sensor outage

Exist

COMPONENT OPERATING RANGE

C0504 and C050A (Case 1)

Both of the following conditions are met	-
Speed sensor fail (C0501, C0502, C0503, C0507, C0508, C0509, C050D, C050E, C050F, C0513, C0514, C0515, C140B, C140C, C140D, C140E, C14E1, C14E4, C14E7, C14EA)	Not detected
Speed sensor pass flag	On

C0504 and C050A (Case 2)

All of the following conditions are met	-
Brake system voltage 1 (VM1)	Less than 16.44 V
Speed sensor pulse	No signal
Wheels are not locked	Met
Vehicle speed	15 km/h (9 mph) or more
Speed sensor fail (C0501, C0502, C0503, C0507, C0508, C0509, C050D, C050E, C050F, C0513, C0514, C0515, C140B, C140C, C140D, C140E, C14E1, C14E4, C14E7, C14EA)	Not detected
Speed sensor pass flag	On

CONFIRMATION DRIVING PATTERN

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

After replacing the skid control ECU (brake booster with master cylinder assembly), perform linear solenoid valve offset learning, ABS holding solenoid valve learning, yaw rate and acceleration sensor zero point calibration and system information memorization after performing "Reset Memory".

Click here

PROCEDURE

1.

CHECK DTC

(a) Clear the DTCs.

Click here

Chassis > ABS/VSC/TRAC > Clear DTCs

(b) Turn the power switch off.

(c) Turn the power switch on (IG).

(d) Check if the same DTC is output.

Click here

Chassis > ABS/VSC/TRAC > Trouble Codes

Result	Proceed to
DTC C1413 is output.	A
DTC C1414 is output.	B

B

GO TO STEP 9

A

2.	READ VALUE USING TECHSTREAM (MOMENTARY INTERRUPTION)

(a) Using the Techstream, check for any momentary interruptions in the wire harness and connector corresponding to a DTC.

Click here

Chassis > ABS/VSC/TRAC > Data List

Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
FR Speed Sensor Voltage Open	Front speed sensor RH voltage open detection	Error or Normal	Error: Momentary interruption Normal: Normal	-

Chassis > ABS/VSC/TRAC > Data List

Tester Display
FR Speed Sensor Voltage Open

(b) Check for any momentary interruptions in the wire harness and connectors.

OK:

There are no momentary interruptions.

NOTICE:

Perform the above inspection before removing the sensor and connector.

NG

GO TO STEP 5

OK

3.	READ VALUE USING TECHSTREAM (FRONT SPEED SENSOR RH)

(a) Select the Data List on the Techstream.

Click here

Chassis > ABS/VSC/TRAC > Data List

Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
FR Wheel Speed	Front speed sensor RH	Min.: 0 km/h (0 mph), Max.: 326.4 km/h (203 mph)	Vehicle stopped: 0 km/h (0 mph)	When driving at constant speed: No large fluctuations

Chassis > ABS/VSC/TRAC > Data List

Tester Display
FR Wheel Speed

(b) Check the front speed sensor RH output value.

OK:

The output value changes in accordance with the vehicle speed.

NG

GO TO STEP 5

OK

4.	RECONFIRM DTC

(a) Clear the DTCs.

Click here

Chassis > ABS/VSC/TRAC > Clear DTCs

(b) Turn the power switch off.

(c) Turn the power switch on (READY).

(d) Perform a road test.

(e) Check if the same DTC is output.

Click here

Chassis > ABS/VSC/TRAC > Trouble Codes

Result	Proceed to
DTC C1413 is not output.	A
DTC C1413 is output.	B

A

USE SIMULATION METHOD TO CHECK

B

REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY

5.	CHECK FRONT SPEED SENSOR RH INSTALLATION

(a) Turn the power switch off.

*1 Front Speed Sensor RH *a OK *b NG *c 8.5 N*m *d No Clearance

(b) Check the front speed sensor RH installation.

OK:

There is no clearance between the sensor and the front steering knuckle.

The installation bolt is tightened properly.

Torque

8.5 N*m (87 kgf*cm, 75 in.*lbf)

NG

REINSTALL OR REPLACE FRONT SPEED SENSOR RH

OK

6.	CHECK FRONT SPEED SENSOR RH AND FRONT SPEED SENSOR ROTOR RH (CHECK FOR FOREIGN MATTER)

(a) Remove the front speed sensor RH and the component with the front speed sensor rotor RH.

for Front Speed Sensor RH: Click here

for Front Speed Sensor Rotor RH: Click here

(b) Check the front speed sensor tip RH and front speed sensor rotor RH.

OK:

The sensor tip and rotor are free of scratches, oil, and foreign matter.

NG

CLEAN OR REPLACE FRONT SPEED SENSOR RH AND FRONT SPEED SENSOR ROTOR RH

OK

7.	CHECK HARNESS AND CONNECTOR (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY - FRONT SPEED SENSOR RH)

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

OK:

The connector is securely connected.

(b) Disconnect the A45 skid control ECU (brake booster with master cylinder assembly) connector.

(c) Disconnect the A46 front speed sensor RH connector.

(d) Check both the connector case and the terminals for deformation and corrosion.

OK:

No deformation or corrosion.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
A45-3 (FR+) - A46-1 (FR+)	Always	Below 1 Ω
A45-3 (FR+) or A46-1 (FR+) - Body ground	Always	10 kΩ or higher
A45-4 (FR-) - A46-2 (FR-)	Always	Below 1 Ω
A45-4 (FR-) or A46-2 (FR-) - Body ground	Always	10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

8.	INSPECT BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY (SENSOR OUTPUT)

(a) Reconnect the A45 skid control ECU (brake booster with master cylinder assembly) connector.

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

(b) Turn the power switch on (IG).

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
A46-1 (FR+) - Body ground	Power switch on (IG)	8 to 14 V

NOTICE:

Check the front speed sensor RH signal after replacement.

Click here

OK

REPLACE FRONT SPEED SENSOR RH

NG

REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY

9.	READ VALUE USING TECHSTREAM (MOMENTARY INTERRUPTION)

(a) Using the Techstream, check for any momentary interruptions in the wire harness and connector corresponding to a DTC.

Click here

Chassis > ABS/VSC/TRAC > Data List

Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
FL Speed Sensor Voltage Open	Front speed sensor LH voltage open detection	Error or Normal	Error: Momentary interruption Normal: Normal	-

Chassis > ABS/VSC/TRAC > Data List

Tester Display
FL Speed Sensor Voltage Open

(b) Check for any momentary interruptions in the wire harness and connectors.

OK:

There are no momentary interruptions.

NOTICE:

Perform the above inspection before removing the sensor and connector.

NG

GO TO STEP 12

OK

10.	READ VALUE USING TECHSTREAM (FRONT SPEED SENSOR LH)

(a) Select the Data List on the Techstream.

Click here

Chassis > ABS/VSC/TRAC > Data List

Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
FL Wheel Speed	Front speed sensor LH	Min.: 0 km/h (0 mph), Max.: 326.4 km/h (203 mph)	Vehicle stopped: 0 km/h (0 mph)	When driving at constant speed: No large fluctuations

Chassis > ABS/VSC/TRAC > Data List

Tester Display
FL Wheel Speed

(b) Check the front speed sensor LH output value.

OK:

The output value changes in accordance with the vehicle speed.

NG

GO TO STEP 12

OK

11.	RECONFIRM DTC

(a) Clear the DTCs.

Click here

Chassis > ABS/VSC/TRAC > Clear DTCs

(b) Turn the power switch off.

(c) Turn the power switch on (READY).

(d) Perform a road test.

(e) Check if the same DTC is output.

Click here

Chassis > ABS/VSC/TRAC > Trouble Codes

Result	Proceed to
DTC C1414 is not output.	A
DTC C1414 is output.	B

A

USE SIMULATION METHOD TO CHECK

B

REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY

12.	CHECK FRONT SPEED SENSOR LH INSTALLATION

(a) Turn the power switch off.

*1 Front Speed Sensor LH *a OK *b NG *c 8.5 N*m *d No Clearance

(b) Check the front speed sensor LH installation.

OK:

There is no clearance between the sensor and the front steering knuckle.

The installation bolt is tightened properly.

Torque

8.5 N*m (87 kgf*cm, 75 in.*lbf)

NG

REINSTALL OR REPLACE FRONT SPEED SENSOR LH

OK

13.	CHECK FRONT SPEED SENSOR LH AND FRONT SPEED SENSOR ROTOR LH (CHECK FOR FOREIGN MATTER)

(a) Remove the front speed sensor LH and the component with the front speed sensor rotor LH.

for Front Speed Sensor LH: Click here

for Front Speed Sensor Rotor LH: Click here

(b) Check the front speed sensor tip LH and front speed sensor rotor LH.

OK:

The sensor tip and rotor are free of scratches, oil, and foreign matter.

NG

CLEAN OR REPLACE FRONT SPEED SENSOR LH AND FRONT SPEED SENSOR ROTOR LH

OK

14.	CHECK HARNESS AND CONNECTOR (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY - FRONT SPEED SENSOR LH)

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

OK:

The connector is securely connected.

(b) Disconnect the A45 skid control ECU (brake booster with master cylinder assembly) connector.

(c) Disconnect the A48 front speed sensor LH connector.

(d) Check both the connector case and the terminals for deformation and corrosion.

OK:

No deformation or corrosion.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
A45-31 (FL+) - A48-1 (FL+)	Always	Below 1 Ω
A45-31 (FL+) or A48-1 (FL+) - Body ground	Always	10 kΩ or higher
A45-32 (FL-) - A48-2 (FL-)	Always	Below 1 Ω
A45-32 (FL-) or A48-2 (FL-) - Body ground	Always	10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

15.	INSPECT BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY (SENSOR OUTPUT)

(a) Reconnect the A45 skid control ECU (brake booster with master cylinder assembly) connector.

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

(b) Turn the power switch on (IG).

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
A48-1 (FL+) - Body ground	Power switch on (IG)	8 to 14 V

NOTICE:

Check the front speed sensor LH signal after replacement.

Click here

OK

REPLACE FRONT SPEED SENSOR LH

NG

REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY

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