Actron CP9087 Service Manual page 58

Section 2
2-50
Testing Sensors
Observe all safety precautions (see page ii) - engine
may start or backfire.
Note: Some computer systems will store a trouble
code in memory (and turn on the "Check Engine"
light) if engine is cranked with sensor disconnected.
Ignore or erase the code after testing. Refer to
vehicle service manual.
– Wheel Speed sensor: Raise wheel off ground. Use
jack stands and observe all safety precautions (see
TEST
page ii). Give the wheel a quick spin in either
direction to test.
Good sensor - TEST lights flicker or stay ON during
testing. Position and range of TEST light activity
varies with sensor type.
Bad sensor - TEST lights OFF during testing.
9) Testing is complete.
Set RANGE switch to POWER OFF and remove all test
leads.