Otc C0046 Lr Wheel Speed Circuit Range/Performance - GMC chevrolet camaro 2000 Service Manual

Brakes
Antilock Brake System 5-145
OTC C0046 LR Wheel Speed Circuit Range/Performance
LR Wheel
Speed
Sensor
@11
Circuit Description
O.SRED
885
0.8 BLK
B
884
C405C
C405B
D, 01
I
C ~ · · 0.5 RED 885
8f34
5 . A14 C2000
---------- C200A
. 0.5 BU<
884
0.5
RED 885
. 22 ________
.?~
C1
' " -------------r- . . : ; ; _ , - -
-fy. -
.,Electronic.Brake
t
High . · L . .
I Control Module
I · . . . · · · · ow .
l(EBCM)
I
LR Wheel . . . .
I
J.
I
Speed Sensor
~
1 ""-41. . .
~~~
~·· L-----------------------J
~
· Broken locks
~
L2w
519704
The speed sensor used on this vehicle is a single
point magnetic pickup. This sensor produces an
- Improperly formed or damaged terrninals
AC signal that the EBCM uses the frequency from to
calculate the wheel speed.
- Poor terminal-to-wiring connectipns
- Physical damage to the wiring harness
· Conditions for Setting the OTC
! "
The OTC will set if one wheel speed
=
O and the
• The following. conditions may cause an intermittent
malfunction:
)
other WSS are greater than 40 Km/h (25 mph) for
1 oms, or if the EBCM detects a short to ground.
.. The OTC will set if during arive off, one wheel
speed = O, and the other WSS are greater than
12 Km/h (7.5 mph).
Action Taken When the OTC Sets
.. A malfunction OTC stores.
• The ABS/TCS disables.
.. The amber ABS/TCS indicator(s) turn on.
" The Red BRAKE Warning. indicator turns on.
Conditions for Clearing the DTC
• The condition responsible for setting the OTC no
longer exists and the scan tool Clear OTCs
function is used.
o
100
ignition cycles pass with no OTC(s) detected.
Important: After the OTC is cleared by ignition
cycle default, the vehicle must be driven above
12 Km/h (8 mph) for the ABS/TCS indicator(s) to
turn off.
Diagnostic Aids
" It is very important that a thorough inspection of
the wiring and connectors be performed. Failure
to carefully and fully inspect wiring and connectors
may result in misdiagnosis, causing part
replacement with reappearance of the malfunction.
• Thoroughly inspect any circuitry that may be
causing the complaint for the following conditions:
- Backed out terminals
- Improper mating
,... A poor connectio.n
- Rubbed-through .wire insulation
- A broken wire inside the insulation
• If the customer's comments reflect that. the amber
ABS/TCS indicat9r is·on only during moist
environmental conditions (rain, snow, vehicle
wash), inspect all the wheel speed sensor circuitry
for signs otwater intrusion. If the OTC is.not
current, clear all OTCs and simulate the effects of
water intrusion by using the following procedure:
1.
Spray the suspected area'. with a five percent
saltwater solution.
Add two teaspoons of salt to twelve ounces
of. water to make a five··percent.saltwater
solution.
2. Test drive.the vehicle. over various road
surfaces (bumps, turns,, etc.) above
40 km/h (?5 mph) for at least 30 seconds.
3.
If the OTC returns, replace the suspected
harness: ·
~ If an intermittent malfunction exists refer to
Testing for Intermittent andPoor Connections
in
Wiring Systems. ·
Rear Wheel Speed Sensor Resistance
Use the following table that contains resistance values
for the rear wheel speed sensors at varying sensor
temperatures for use in diagnosis. The values
are approximate and should be used as a guideline
for diagnosis. Refer to
ABS Diagnostic Specifications.