GMC chervolet camaro 1999 Service Manual page 693

5-218 Antilock Brake System
Action Taken When the DTC Sets
• A malfunction DTC stores.
• The Assrrcs disables.
• The amber ABSrrcs indicator(s) turn on.
• The Red BRAKE Warning indicator turn 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 DTCs 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
• The following conditions may cause an intermittent
malfunction:
- A poor connection
Brakes
• If the customer's comments reflect that the amber
ABSrrcs indicator is on only during moist
environmental conditions (rain, snow, vehicle
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
Troubleshooting Procedures Cell 4 in Electrical
Diagnosis for further diagnosis.
Test Description
The numbers below refer to step numbers on the
diagnostic table.
2. If DTC C0245 is a history code, this step checks if
a specific Wheel Speed Circuit Malfunction OTC
is set concurrently with OTC C0245.
7. This step checks if the wheel speed sensor
harness is routed in close proximity to the spark
plug wires.
9. In this step, if the scan tool can record any
- Rubbed-through wire insulation erroneous wheel speed sensor signals, diagnose
- A broken wire inside the insulation that sensor(s) first.
DTC C0245 Wheel Speed Sensor Frequency Error
Step
Action
Value(s) Yes No
Go to ABS
1
Was the Diagnostic System Check performed?
-
Go to Step2 Diagnostic
System Check
Is the following DTC(s) set concurrently with a history
DTC C0245?
• DTC C0036
2
• DTC C0041
-
Go to DTC Table Go to Step3
• DTC C0046
• DTC C0051
• DTC C0056
3
Inspect the WSS for physical damage.
-
Go to Step 4 Go to Step5
Is physical damage of the WSS evident?
4
Replace the WSS.
-
Go to Step 14
-
Is the replacement complete?
5
Inspect the jumper harness for physical damage.
-
Go to Step 6 Go to Step 7
Is physical damage of the jumper harness evident?
6
Replace the jumper harness.
-
Go to Step 14
-
Is the replacement complete?
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