Test 27A

Wheel Speed Sensor Circuit:

NOTE: You must perform Test 1A, before proceeding with this test.

INTERMITTENT WSS SIGNAL (ALL WHEELS)
When Its Monitored
The test is conducted during periods of acceleration.

Set Condition
The Controller Antilock Brake (CAB) monitors each individual wheel speed sensor for acceleration rates. The trouble code is stored when an unrealistic acceleration rate is monitored on any wheel for over 110 ms.

NOTE: The loss of continuity on any wheel speed sensor can cause this code to be stored.

Possible Causes:
^ Failed CAB
^ Intermittent open circuit of any wheel speed sensor
^ Wheel speed sensor harnesses damaged

PROCEDURE
1. If any other wheel speed sensor diagnostic trouble codes are present, repair them before proceeding with this test.
2. Refer to the trouble code list below and perform the indicated test.

Test List
^ Intermittent CAB WSS Signal Test 27B

NOTE: Perform Test 20A in addition to any other repairs made in Test 27B.

^ Intermittent RR Wheel Speed Sensor Signal Test 27C

^ Intermittent LR Wheel Speed Sensor Signal Test 27C

^ Intermittent RF Wheel Speed Sensor Signal Test 27C

^ Intermittent LF Wheel Speed Sensor Signal Test 27C