Test 2A - Right Front Sensor Open (Code 21)

Test 2A: Repairing Code (21) Right Front Sensor Open (Part 1 Of 2):

Test 2A: Reparing Code (21) Right Front Sensor Open (Part 2 Of 2):

NOTE: When connecting or disconnecting connectors and inspecting connectors clean and repair as necessary.

NOTE: After completion of a repair or test then perform Verification Test. Verification Test VER-1A - ABS

NAME OF CODE:
Right Front Sensor Open

SET CONDITION:
The following criteria must be met for this code to be detected.
1. No output signal from any sensor for initial 1.0 second period.
2. Continuously excessive sensor resistance for subsequent 1.0 second period.

THEORY OF OPERATION:
The Controller Antilock Brake (CAB) continuously monitors the wheel speed sensor circuits. The CAB sends a small signal through the sensor circuits. If the CAB does not receive the proper signal back, a Sensor Open code is set.

NOTE: Front wheel speed sensors have a resistance of 1000 to 2500 ohms.

POSSIBLE CAUSES:
- Open circuit in sensor or sensor wiring (including connectors).
- Wheel speed sensor (+) circuit shorted to battery voltage.
- CAB's internal wheel speed sensor IC shorted.

Controller-Antilock Brake Connector:

Controller-Antilock Brake Connector:

Right Front Wheel Speed Sensor Connector:

Controller-Antilock Brake Connector And Wheel Speed Sensor Connector:

Controller-Antilock Brake Connector And Wheel Speed Sensor Connector: