C0245

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Part 2 Of 2:

CIRCUIT DESCRIPTION
The speed sensors used on the front of this vehicle are multiple pole and the rear uses a single pole magnetic pickup. This sensor produces an AC signal that the Electronic Brake Traction Control Module (EBTCM) uses the frequency from to calculate the wheel speed.

CONDITIONS FOR SETTING THE DTC
^ The Electronic Brake Traction Control Module (EBTCM) detects a deviation between the left and right rear wheel speeds of greater than 6 Km/h (3.75 mph) at a vehicle speed of less than 10O Km/h (62 mph) on vehicles equipped with Traction Control System (TCS).
^ EBCM/EBTCM detects a deviation between the left and right front wheel speeds of greater than 1OKm/h (6.25 mph) at a vehicle speed of less than 10O Km/h (62 mph).
^ The EBTCM detects a deviation between the left and right rear wheel speeds of greater than 6 percent of the vehicle speed at greater than 100 Km/h (62 mph) on vehicles equipped with TCS.
^ The EBCM/EBTCM detects a deviation between the left and right front wheel speeds of greater than 4 Km/h plus 6 percent of the vehicle speed at greater than 100 Km/h (62 mph).

This Diagnostic Trouble Code (DTC) will set when the EBCM/EBTCM cannot specifically identify which Wheel Speed Sensor (WSS) is causing the malfunction. If the EBCM/EBTCM can identify the specific WSS causing the malfunction, DTC C0245 will become a history DTC, and the DTC associated with the sensor (DTC C0036, DTC C0041, DTC C0046, DTC C0051, or DTC C0056) will be set concurrent with DTC C0245.

ACTION TAKEN WHEN THE DTC SETS
^ A malfunction Diagnostic Trouble Code (DTC) stores.
^ The Antilock Brake System/Traction Control System (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 Diagnostic Trouble Code (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
- Rubbed-through wire insulation
- A broken wire inside the insulation

^ If the customer's comments reflect that the amber Antilock Brake System/Traction Control System (ABS/TCS) indicator is on only during moist environmental conditions (rain, snow, vehicle wash), inspect all the Wheel Speed Sensor (WSS) circuitry for signs of water intrusion. If the Diagnostic Trouble Code (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 Diagnostic Trouble Code (DTC) C0245 is a history code, this step checks if a specific Wheel Speed Circuit Malfunction DTC is set concurrently with DTC C0245.
7. This step checks if the Wheel Speed Sensor (WSS) harness is routed in close proximity to the spark plug wires.
9. In this step, if the scan tool can record any erroneous wheel speed sensor signals, diagnose that sensor(s) first.