Speed Sensor Check When Using Intelligent Tester

(a) Check the backward signal.

(1) Drive the vehicle in reverse for more than 1 second at 2 mph (3 km/h) or higher. HINT:

Drive the vehicle in reverse and check the speed sensor signal. Note that the signal check cannot be completed if the vehicle speed is 28 mph (45 km/h) or more.

Blinking Pattern in TEST MODE

(b) Check the forward signal.

(1) Drive the vehicle straight forward.

Accelerate the vehicle to a speed of 28 mph (45 km/h) or higher for several seconds and check that the ABS warning light goes off. HINT:

The signal check may not be completed if the vehicle has its wheels spun or the steering wheel turned during this check.

(c) Stop the vehicle. NOTICE:

• Before performing the speed sensor signal check, complete the acceleration sensor and master cylinder pressure sensor checks.

• The speed sensor signal check may not be completed if the speed sensor signal check is started while turning the steering wheel or spinning the wheels.

• After the ABS warning light goes off and if the vehicle speed exceeds 50 mph (80 km/h), a signal check code will be stored again. Decelerate or stop the vehicle before the speed reaches 50 mph (80 km/h).

• If the signal check has not been completed, the ABS warning light blinks while driving and the ABS system does not operate.

HINT:

When the signal check has been completed, the ABS warning light goes off while driving and blinks in the test mode pattern while stationary.

(d) Check the VSC sensor.

(1) Check that the VSC warning light is blinking in TEST MODE and perform the check. 6. YAW RATE SENSOR CHECK (WHEN USING INTELLIGENT TESTER:)

(a) Check the VSC warning light is blinking in TEST MODE.

(b) Check the zero point voltage of the yaw rate sensor. (1) Keep the vehicle in a stationary condition on a level surface for 1 second or more.

(c) Check the output of the yaw rate sensor and the direction of the steering angle sensor.

(1) Move the shift lever to the D position and drive the vehicle at a speed of approximately 3 mph (5 km/h), turn the steering wheel either to the left or right 90° or more until the vehicle makes a 180° turn.

(2) Stop the vehicle and move the shift lever to the P position. Check that the skid control buzzer sounds for 3 seconds.

HINT:

• If the skid control buzzer sounds, the signal check is completed normally.

Blinking Pattern in TEST MODE

ABS sensor:

• If the skid control buzzer does not sound, check the skid control buzzer circuit (See page BC-229), then perform the signal check again.

• If the skid control buzzer still does not sound, there is a malfunction in the yaw rate sensor, so check the DTC.

• Make a 180° turn. At the end of the turn, the direction of the vehicle should be within 180° +- 5° of its start position.

• Do not turn the ignition switch off while turning.

• Do not move the shift lever to the P position while turning, but change in the vehicle speed, stopping, or driving in reverse is possible.

• Complete the turn within 20 seconds.

7. END OF SENSOR CHECK (WHEN USING INTELLIGENT TESTER:)

(a) If the sensor check is completed, the ABS warning light blinks (test mode) when the vehicle stops and the ABS warning light is off when the vehicle is driving.

NOTICE:

• When the yaw rate sensor, acceleration sensor, speed sensor and master cylinder pressure sensor checks are completed, the sensor check is completed.

• If the sensor check is not completed, the ABS warning light blinks even while the vehicle is driving and the ABS does not operate.

8. READ DTC OF SIGNAL CHECK FUNCTION (WHEN USING INTELLIGENT TESTER:)

(a) Read the DTC(s) by following the tester screen.

NOTICE:

• If only the DTCs are displayed, repair the malfunction area and clear the DTCs.

• If the DTCs or test mode codes (DTC of signal check function) are displayed, repair the malfunction area, clear the DTCs and perform the test mode inspection.

HINT:

See the list of DTC.

9. DTC OF TEST MODE FUNCTION (SIGNAL CHECK) (WHEN USING INTELLIGENT TESTER:)

Code No.

Diagnosis

Trouble Area

C1271/71

Low output voltage of right front speed sensor

• Right front speed sensor

• Sensor installation

• Sensor rotor

C1272/72

Low output voltage of left front speed sensor

• Left front speed sensor

• Sensor installation

• Sensor rotor

Code No.

Diagnosis

Trouble Area

C1273/73

Low output voltage of right rear speed sensor

• Right rear speed sensor

• Sensor installation

• Sensor rotor

C1274/74

Low output voltage of left rear speed sensor

• Left rear speed sensor

• Sensor installation

• Sensor rotor

C1275/75

Abnormal change in output voltage of right front speed sensor

Right front sensor rotor

C1276/76

Abnormal change in output voltage of left front speed sensor

Left front speed sensor rotor

C1277/77

Abnormal change in output voltage of right rear speed sensor

Right rear sensor rotor

C1278/78

Abnormal change in output voltage of left rear speed sensor

Left rear speed sensor rotor

C1279/79

Acceleration sensor is faulty

• Yaw rate (acceleration) sensor

• Sensor installation

C1281/81

Master cylinder pressure sensor output signal is faulty

• Master cylinder pressure sensor

• Stop light switch

VSC sensor:

Code No.

Diagnosis

Trouble Area

CG371/71

Yaw rate sensor output signal is malfunction

Yaw rate sensor

HINT:

• The codes in this table are output only in test mode (SIGNAL CHECK).

• See the Trouble Area in the table to proceed with troubleshooting.

• After troubleshooting is completed, check that no DTCs are output.

Do It Yourself Car Diagnosis

Do It Yourself Car Diagnosis

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