Test D: Unintended ABS Activation

Pinpoint Test D: Unintended ABS Activation
Refer to Vehicle/Diagrams, Vehicle Dynamic Systems for schematic and connector information.

Normal Operation
The wheel speed sensor and sensor ring generate a square wave signal to the ABS module that is proportional to wheel speed. The ABS module compares wheel speed inputs from all wheel speed sensors to determine an impending wheel lockup.





This pinpoint test is intended to diagnose the following:
^ Mismatched tire sizes
^ Improperly inflated tire(s)
^ Wheel speed sensor ring
^ Wheel speed sensor
^ ABS module
^ Incorrect axle ratio configuration in ABS module

D1-D3:

D3 (Continued)-D5:

D5 (Continued)-D8:

D9: