Lexus NX: Stroke Sensor (C1247,C1346,C1392)

Lexus NX Service Manual / Brake / Brake Control / Dynamic Control Systems / Electronically Controlled Brake System / Stroke Sensor (C1247,C1346,C1392)

DESCRIPTION

The brake pedal stroke sensor assembly sends a signal about the pedal stroke to the skid control ECU (brake booster with master cylinder assembly).

DTC C1346 will be cleared when the brake pedal stroke sensor assembly sends a brake pedal stroke sensor assembly signal or when Test Mode ends. DTC C1346 is output only in Test Mode.

DTC No.	Detection Item	INF Code	DTC Detection Condition	Trouble Area	Note
C1247	Stroke Sensor	211 212 213 214 215 216 217 218 219 220 221 222 223	INF Code: 211 Sensor supply voltage (VCM1) is 4.75 V or less, or 5.25 V or more for 0.2 seconds or more. INF Code: 212 Sensor output voltage 1 (SKS1) is less than 5.5%, or 94% or more (less than 0.27 V, or 4.7 V or more) of sensor supply voltage (VCM1) for 0.2 seconds or more. INF Code: 213 Sensor output voltage 2 (SKS2) is less than 5.5%, or 94% or more (less than 0.27 V, or 4.7 V or more) of sensor supply voltage (VCSK) for 0.2 seconds or more. INF Code: 214 Either of the following is detected: Fluctuation of sensor output 1 (SKS1) is out of specification. The difference between the present value and last value of sensor output voltage 1 (SKS1) is 8.5% or more (0.43 V or more) of sensor supply voltage (VCM1) for 0.2 seconds or more. INF Code: 215 Either of the following is detected: Fluctuation of sensor output 2 (SKS2) is out of specification. The difference between the present value and last value of the sensor output voltage 2 (SKS2) is 8.5% or more (0.43 V or more) of the sensor supply voltage (VCM1) for 0.2 seconds or more. INF Code: 216 Either of the following is detected: Pedal off position (zero point stored value) is out of specification. The zero point stored value for the sensor output voltage 1 (SKS1) is deviates -17% to 25.9% (0.15 to 2.3 V) or more from the theoretical value. INF Code: 217 Either of the following is detected: Pedal off position (zero point stored value) is out of specification. The zero point stored value for the sensor output voltage 2 (SKS2) deviates -31.7% to 17% (2.42 to 4.85 V) or more from the theoretical value. INF Code: 218 An excessive difference between the change in sensor output 1 (SKS1) and sensor output 2 (SKS2) is detected for 0.2 seconds or more. INF Code: 219 Sensor data is invalid for 0.2 seconds or more. (Skid control ECU (Brake booster with master cylinder assembly) internal monitor circuit malfunction.) INF Code: 220 The sum of sensor output voltage 1 (SKS1) and sensor output voltage 2 (SKS2) deviates 15% or more from the theoretical value 5 V. INF Code: 221 An excessive difference exists between the variation in sensor output voltage 1 (SKS1) and sensor output voltage 2 (SKS2). INF Code: 222 Sensor power source voltage (VCM1) remains at 4.75 V or less or 5.25 V or more and the sensor data is invalid for 0.2 seconds or longer. INF Code: 223 Sensor data is invalid for 0.2 seconds or more. (Open, short or noise.)	INF Code: 211 Open or short in brake pedal stroke sensor assembly power supply circuit Improperly connected connector, deformation or corrosion of terminals Skid control ECU (Brake booster with master cylinder assembly) INF Code: 212, 213, 214, 215, 216, 217, 218, 219, 220, 221, 222, 223 Open or short in wire harness Improperly connected connector, deformation or corrosion of terminals Brake pedal stroke sensor assembly	-
C1346	Abnormal Learning of Stroke Sensor Zero Point	-	Detected only during Test Mode.	Brake pedal stroke sensor assembly Brake pedal stroke sensor assembly circuit	-
C1392	Zero Point Calibration of Stroke Sensor undone	-	Zero point calibration of brake pedal stroke sensor assembly is unfinished.	Brake pedal stroke sensor zero point calibration incomplete (Initialization and calibration of linear solenoid valve incomplete) Skid control ECU (Brake booster with master cylinder assembly)	-

DTC No.

Detection Item

INF Code

DTC Detection Condition

Trouble Area

Note

C1247

Stroke Sensor

211

212

213

214

215

216

217

218

219

220

221

222

223

INF Code: 211
- Sensor supply voltage (VCM1) is 4.75 V or less, or 5.25 V or more for 0.2 seconds or more.
INF Code: 212
- Sensor output voltage 1 (SKS1) is less than 5.5%, or 94% or more (less than 0.27 V, or 4.7 V or more) of sensor supply voltage (VCM1) for 0.2 seconds or more.
INF Code: 213
- Sensor output voltage 2 (SKS2) is less than 5.5%, or 94% or more (less than 0.27 V, or 4.7 V or more) of sensor supply voltage (VCSK) for 0.2 seconds or more.
INF Code: 214
- Either of the following is detected:
  1. Fluctuation of sensor output 1 (SKS1) is out of specification.
  2. The difference between the present value and last value of sensor output voltage 1 (SKS1) is 8.5% or more (0.43 V or more) of sensor supply voltage (VCM1) for 0.2 seconds or more.
INF Code: 215
- Either of the following is detected:
  1. Fluctuation of sensor output 2 (SKS2) is out of specification.
  2. The difference between the present value and last value of the sensor output voltage 2 (SKS2) is 8.5% or more (0.43 V or more) of the sensor supply voltage (VCM1) for 0.2 seconds or more.
INF Code: 216
- Either of the following is detected:
  1. Pedal off position (zero point stored value) is out of specification.
  2. The zero point stored value for the sensor output voltage 1 (SKS1) is deviates -17% to 25.9% (0.15 to 2.3 V) or more from the theoretical value.
INF Code: 217
- Either of the following is detected:
  1. Pedal off position (zero point stored value) is out of specification.
  2. The zero point stored value for the sensor output voltage 2 (SKS2) deviates -31.7% to 17% (2.42 to 4.85 V) or more from the theoretical value.
INF Code: 218
- An excessive difference between the change in sensor output 1 (SKS1) and sensor output 2 (SKS2) is detected for 0.2 seconds or more.
INF Code: 219
- Sensor data is invalid for 0.2 seconds or more.
  (Skid control ECU (Brake booster with master cylinder assembly) internal monitor circuit malfunction.)
INF Code: 220
- The sum of sensor output voltage 1 (SKS1) and sensor output voltage 2 (SKS2) deviates 15% or more from the theoretical value 5 V.
INF Code: 221
- An excessive difference exists between the variation in sensor output voltage 1 (SKS1) and sensor output voltage 2 (SKS2).
INF Code: 222
- Sensor power source voltage (VCM1) remains at 4.75 V or less or 5.25 V or more and the sensor data is invalid for 0.2 seconds or longer.
INF Code: 223
- Sensor data is invalid for 0.2 seconds or more.
  (Open, short or noise.)

INF Code: 211
- Open or short in brake pedal stroke sensor assembly power supply circuit
- Improperly connected connector, deformation or corrosion of terminals
- Skid control ECU (Brake booster with master cylinder assembly)
INF Code: 212, 213, 214, 215, 216, 217, 218, 219, 220, 221, 222, 223
- Open or short in wire harness
- Improperly connected connector, deformation or corrosion of terminals
- Brake pedal stroke sensor assembly

C1346

Abnormal Learning of Stroke Sensor Zero Point

Detected only during Test Mode.

Brake pedal stroke sensor assembly
Brake pedal stroke sensor assembly circuit

C1392

Zero Point Calibration of Stroke Sensor undone

Zero point calibration of brake pedal stroke sensor assembly is unfinished.

Brake pedal stroke sensor zero point calibration incomplete (Initialization and calibration of linear solenoid valve incomplete)
Skid control ECU (Brake booster with master cylinder assembly)

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

When replacing the skid control ECU (brake booster with master cylinder assembly) or brake pedal stroke sensor assembly, perform initialization and calibration of the linear solenoid valve.

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HINT:

Check the condition of each related circuit connector before troubleshooting.

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PROCEDURE

1.	CHECK BRAKE PEDAL

(a) Check that the brake pedal and the brake pedal stroke sensor assembly are properly installed and that the pedal can be depressed normally.

(b) Check and adjust the brake pedal height.

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2.	CHECK HARNESS AND CONNECTOR (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY - BRAKE PEDAL STROKE SENSOR ASSEMBLY)

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

(b) Disconnect the A57 skid control ECU (brake booster with master cylinder assembly) connector.

(d) Check both the connector case and the terminal 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
A57-39 (VCSK) - A53-3 (VCSK)	Always	Below 1 Ω
A57-39 (VCSK) or A53-3 (VCSK) - Body ground	Always	10 kΩ or higher
A57-41 (SKG) - A53-1 (SKG)	Always	Below 1 Ω
A57-41 (SKG) or A53-1 (SKG) - Body ground	Always	10 kΩ or higher
A57-42 (SKS) - A53-4 (SKS1)	Always	Below 1 Ω
A57-42 (SKS) or A53-4 (SKS1) - Body ground	Always	10 kΩ or higher
A57-40 (SKS2) - A53-2 (SKS2)	Always	Below 1 Ω
A57-40 (SKS2) or A53-2 (SKS2) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

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

(a) Reconnect the A57 skid control ECU (brake booster with master cylinder assembly) connector.

*a	Front view of wire harness connector (to Brake Pedal Stroke Sensor Assembly)

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

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
A53-3 (VCSK) - A53-1 (SKG)	Power switch on (IG)	4.84 to 5.16 V

REPLACE BRAKE PEDAL STROKE SENSOR ASSEMBLY

REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY

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