Otc C0055 Rear Wheel Speed Circuit Malfunction - GMC chevrolet camaro 2000 Service Manual

5-154 Antilock Brake System
Brakes
DTC C0055 Rear Wheel Speed Circuit Malfunction
Rear
0.5WHT
Wheel
885
Speed
@
II
Sensor
0.5 BLK
A
884
Circuit Description
The speed sensor used on this vehicle is a single
point magnetic pickup. This sensor produces an
AC signal that the EBCM uses the frequency from to
calculate the wheel speed.
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• The following conditions may cause an intermittent
malfunction:
- A poor connection
- Rubbed-through wire insulation
- A broken wire inside the insulation
• If the customer's comments reflect that the amber
(
Conditions for Setting the DTC
The DTC c.an be set any time the ignition is in the
RUN position and the EBCM detects an open or
ABS indicator is on only during moist (
environmental conditions (rain, snow, vehicle .
a short to voltage.
Action Taken When the DTC Sets
• A malfunction DTC stores.
• The ABS disables.
• The amber ABS indicator turns on.
• The Red BRAKE Warning indicator turns on.
Conditions for Clearing the DTC
• The condition responsible for setting the DTC no
longer exists and the scan tool Clear DTCs
function is used.
• 100 ignition cycles pass with no DTC(s) detected.
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
- Broken locks
- Improperly formed or damaged terminals
- Poor terminal-to-wiring connections
- Physical damage to the wiring harness
wash), inspect all the wheel speed sensor circuitry
for signs of water intrusion. If the DTC is not
current, clear all DTCs 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 (25 mph) for at least 30 seconds.
3.
If the DTC returns, replace the suspected
harness.
• If an intermittent malfunction exists refer to
Testing for Intermittent and Poor 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.
Test Description
The numbers below refer to step numbers on the
diagnostic table.
6. This step checks for an open in the WSS or
WSS CKT.
13. Checks for a short to voltage in the WSS CKT.
15. Checks for a short to voltage in the WSS CKT.