C1277

DTC C1277/77 Abnormal Change in Output Signal of Rear Speed Sensor RH (Test Mode DTC)

DESCRIPTION

DTC Detection Condition (Part 1):

DTC Detection Condition (Part 2):

The speed sensor detects wheel speed and transmits the appropriate signals to the ECU. These signals are used for control of the ABS control system. Each of the front and rear rotors has 48 serrations.

When the rotors rotate, the magnetic field generated by the permanent magnet in the speed sensor induces AC voltage. Since the frequency of this AC voltage changes in direct proportion to the speed of the rotor, the frequency is used by the ECU to detect the speed of each wheel.

DTCs C1273/73, C1274/74, C1277/77 and C1278/78 can be deleted when the speed sensor sends a vehicle speed signal or the test mode ends. DTCs C1273/73, C1274/74, C1277/77 and C1278/78 are out put only in the test mode.

Wiring Diagram:

Step 1:

Step 2-3:

Step 4:

Step 5-6:

Step 6(Continued)-9:

INSPECTION PROCEDURE