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Lexus RX300 (MCU15). Service manual - part 245

F02098

GL2

GL1

VGS

GGND

Front

Rearward

(+)

(–)

Forward

DI–212

–

DIAGNOSTICS

ABS & BA & TRC & VSC SYSTEM

LEXUS RX300 (RM785E)

DECELERATION SENSOR CHECK

(a)

Connect 3 dry batteries of 1.5 V in series.

(b)

Connect VGS terminal to the batteries’ positive (+) termi-
nal, and GGND terminal to the batteries’ negative (–) ter-
minal, apply about 4.5 V between VGS – GGND termi-
nals.

NOTICE:

When inspecting deceleration sensor, remove it with
the bracket together. Do not remove the sensor from
the bracket. When replacing deceleration sensor, re-
place the sensor with it assembled to the bracket as-
sembly.

Do not apply voltage of 6 V or more to terminals VGS
and GGND.

(c)

Check the output voltage of GL1 and GL2 terminals.

Symbols

Condition

Standard Value

GL1

Horizontal

About 2.3 V

GL1

Lean forward

0.4 V – about 2.3 V

GL1

Lean rearward

About 2.3 V – 4.1 V

GL2

Horizontal

About 2.3 V

GL2

Lean forward

About 2.3 V – 4.1 v

GL2

Lean rearward

0.4 V – about 2.3 V

HINT:

If the sensor is tilted too much it may show the wrong val-
ue.

If dropped, the sensor should be replaced with a new one.

The sensor removed from the vehicle should not be
placed upside down.

DI0WA–10

–

DIAGNOSTICS

ABS & BA & TRC & VSC SYSTEM

DI–213

LEXUS RX300 (RM785E)

DIAGNOSTIC TROUBLE CODE CHART

NOTICE:
Before replacing or removing the part, turn the ignition switch OFF.
HINT:

Using SST 09843–18040, connect the terminals Tc and CG of DLC3.

If any abnormality is not found when inspecting parts, inspect the ECU.

If a malfunction code is displayed during the DTC check, check the circuit listed for that code. For de-
tails of each code, turn to the page referred to under the ”See page” for respective ”DTC No.” in the
DTC chart.

DTC chart of ABS:

DTC No.

(See Page)

Detection Item

Trouble Area

C0200 / 31*

(DI–222)

Right front wheel speed sensor signal malfunction

C0205 / 32*

(DI–222)

Left front wheel speed sensor signal malfunction

S Right front, left front, right rear and left rear speed sensor

C0210 / 33*

(DI–222)

Right rear wheel speed sensor signal malfunction

S Each speed sensor circuit

S Sensor rotor

C0215 / 34*

(DI–222)

Left rear wheel speed sensor signal malfunction

C0226 / 21

(DI–229)

Open or short circuit of brake actuator solenoid circuit (SFR

circuit)

S Brake actuator

S SFRR or SFRH circuit

C0236 / 22

(DI–229)

Open or short circuit of brake actuator solenoid circuit (SFL

circuit)

S Brake actuator

S SFLR or SFLH circuit

C0246 / 23

(DI–229)

Open or short circuit of brake actuator solenoid circuit (SRR

circuit)

S Brake actuator

S SRRR or SRRH circuit

C0256 / 24

(DI–229)

Open or short circuit of brake actuator solenoid circuit (SRL

circuit)

S Brake actuator

S SRLR or SRLH circuit

C0273 / 13*

(DI–233)

Open or short circuit of ABS motor relay circuit

S ABS motor relay

C0274 / 14

(DI–233)

B+ short circuit of ABS motor relay circuit

ABS motor relay

S ABS motor relay circuit

C0278 / 11

(DI–237)

Open or short circuit of ABS solenoid relay circuit

S ABS solenoid relay

C0279 / 12

(DI–237)

B+ short circuit of ABS solenoid relay circuit

ABS solenoid relay

S ABS solenoid relay circuit

C1225 / 25

(DI–229)

Open or short circuit of brake actuator solenoid circuit (SMC1

or SMC2 circuit)

S Brake actuator

S SMC1 or SMC2 circuit

C1226 / 26

(DI–229)

Open or short circuit of brake actuator solenoid circuit (SMV1

or SMV2 circuit)

S Brake actuator

S SMV1 or SMV2 circuit

C1227 / 27

(DI–229)

Open or short circuit of brake actuator solenoid circuit (SRC1

or SRC2 circuit)

S Brake actuator

S SRC1 or SRC2 circuit

C1235 / 35

(DI–222)

Foreign matter is attached on the tip of the right front sensor

C1236 / 36

(DI–222)

Foreign matter is attached on the tip of the left front sensor

S Right front, left front, right rear, left rear speed sensor

C1238 / 38

(DI–222)

Foreign matter is attached on the tip of the right rear sensor

Right front, left front, right rear, left rear s eed sensor

S Speed sensor rotor

C1239 / 39

(DI–222)

Foreign matter is attached on the tip of the left rear sensor

DI–214

–

DIAGNOSTICS

ABS & BA & TRC & VSC SYSTEM

LEXUS RX300 (RM785E)

C1241 / 41

(DI–263)

Low battery voltage or abnormally high battery voltage

S Battery

S Charging system

S Power source circuit

C1243 / 43*

(DI–267)

Malfunction in deceleration sensor (abnormal constant output)

S Deceleration sensor

S Wire harness for deceleration sensor system

C1244 / 44

(DI–269)

Open or short circuit of deceleration sensor circuit

S Deceleration sensor

S Deceleration sensor circuit

C1245 / 45*

(DI–267)

Malfunction in deceleration sensor

S Deceleration sensor

S Wire harness for deceleration sensor system

C1246 / 46*

(DI–271)

Malfunction in master cylinder pressure sensor

S Master cylinder pressure sensor

S Master cylinder pressure sensor circuit

C1249 / 49

(DI–274)

Open circuit of stop light switch circuit

Stop light switch circuit

C1251 / 51*

(DI–277)

Pump motor is locked

Open circuit of pump motor circuit

ABS pump motor

Always ON

(DI–281)

Malfunction in skid control ECU

S Battery

S Charging system

S Power source circuit

S Skid control ECU

*1: These DTC will not affect to cancel the ABS warning light by repairing the trouble area, so perform
the following operations.
(1)

Drive the vehicle at 20 km/h (12 mph) for 30 seconds or more and check that the ABS warning
light goes off.

(2)

Clear the DTC (See page DI–205).

*2: These DTC will not affect to cancel the ABS warning light by repairing the trouble area, so perform
the following operations.
(1)

Keep the vehicle in the stationary condition for 5 seconds or more and depress the brake pedal
lightly 2 or 3 times.

(2)

Driving the vehicle at the vehicle speed 50 km/h (31 mph) and keep depressing the brake pedal
strongly for about 3 seconds.

(3)

Repeat the above operation 3 times or more and check that the ABS warning light goes off.

(4)

Clear the DTC (See page DI–205).

HINT:
There is a case that hand–held tester cannot be used when ABS warning light is always on.
DTC chart of VSC:

DTC No.

(See page)

Detection Item

Trouble Area

C1201 / 51

(DI–242)

Engine and ECT ECU system malfunction

Engine control system

C1202 / 52

(DI–243)

Brake fluid level low

Open circuit of brake fluid level warning switch circuit

S Brake fluid level

S Brake fluid level warning switch

S Brake fluid level warning switch circuit

C1203 / 53

(DI–245)

Engine and ETC ECU communication circuit malfunction

S TRC+ or TRC– circuit

S ENG+ or ENG– circuit

S Engine and ECT ECU

C1207 / 37

(DI–247)

Malfunction in neutral start switch

S Neutral start switch

S Neutral start switch (Park/Reverse range circuit)

C1210 / 36

(DI–250)

Zero point calibration of yaw rate sensor undone

S Yaw rate sensor

S Yaw rate sensor circuit

S P range switch circuit

–

DIAGNOSTICS

ABS & BA & TRC & VSC SYSTEM

DI–215

LEXUS RX300 (RM785E)

C1223 / 43

(DI–252)

Malfunction in ABS control system

ABS control system

C1224 / 44

(DI–253)

Open or short circuit of NE signal circuit

S NEO circuit

S Engine and ECT ECU

C1231 / 31

(DI–255)

Malfunction in steering angle sensor

S Steering angle sensor

S Steering angle sensor circuit

C1232 / 32

(DI–258)

Malfunction in deceleration sensor

S Deceleration sensor

S Deceleration sensor circuit

C1233 / 33

(DI–260)

Open or short circuit of yaw rate sensor circuit

S Yaw rate sensor

C1234 / 34

(DI–260)

Malfunction in yaw rate sensor

Yaw rate sensor

S Yaw rate sensor circuit

C1335 / 35

(DI–279)

Malfunction in steering angle sensor communication circuit

Steering angle sensor circuit

Always ON

(DI–284)

Malfunction in skid control ECU

Open circuit of VSC warning indicator circuit

S Power source circuit

S Charging system

S VSC warning indicator circuit

S Skid control ECU

HINT:
There is a case that hand–held tester cannot be used when VSC warning indicator is always on.

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