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HOMESERVICE MANUALSCHEVROLET2006CHEVY EXPRESS G2500, VAN CARGO, 6.6 2REPAIR AND DIAGNOSISBRAKESANTILOCK BRAKE SYSTEM WITH TRACTION CONTROL SYSTEM & STABILITY CONTROL SYSTEMDIAGNOSTIC INFORMATION AND PROCEDURESDTC C0186TEST DESCRIPTION
2006 Chevrolet Chevy Express G2500, Van Cargo, 6.6 2

Test Description

2006 Chevrolet Chevy Express G2500, Van Cargo, 6.6 2SECTION Test Description

The numbers below refer to the step numbers on the diagnostic table.

  1. 3:  This step tests the sensor circuitry in the high voltage range.
  2. 4:  This step tests the sensor circuitry in the low voltage range.
DTC C0186

Step Action Values Yes No
Schematic Reference: ABS Schematics 
Connector End View Reference: ABS Connector End Views 
IMPORTANT: If DTC C0292 is set, diagnose C0292 before proceeding with diagnostics for C0186.
If DTC C0196 is set, diagnose C0196 before proceeding with diagnostics for C0186.
Always use connector test adapters when performing tests to avoid damage to delicate connector terminals.
Do not turn OFF the ignition during this diagnostic procedure unless the step in the table instructs you to do so. The scan tool may display some incorrect data if the ignition is cycled.
1 Did you perform the ABS Diagnostic System Check - Vehicle? - Go to Step 2  Go to Diagnostic System Check - Vehicle
2
  1. Use the scan tool to clear the DTCs.
  2. Turn OFF the ignition for 5 seconds.
  3. Turn ON the ignition.
  4. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text.
Does the DTC reset?		 - Go to Step 3  Go to Diagnostic Aids
3 
  1. Turn OFF the ignition.
  2. Disconnect the yaw rate sensor/lateral accelerometer harness connector. Refer to Yaw Rate Sensor/Lateral Accelerometer Replacement .
  3. Turn ON the ignition.
  4. Select the vehicle stability enhancement system (VSES) Data Display function on the scan tool.
  5. Connect a 3-amp fused jumper wire between the yaw rate sensor/lateral accelerometer 5-volt reference circuit and the lateral accelerometer signal circuit. Refer to Using Fused Jumper Wires .
  6. Observe the Lateral Accelerometer Sensor Input on the scan tool.
Is the Lateral Accelerometer Sensor Input voltage greater than the specified value?		 4.4 V Go to Step 4  Go to Step 5 
4 
  1. Remove the fused jumper wire from the yaw rate sensor/lateral accelerometer harness connector.
  2. Observe the Lateral Accelerometer Sensor Input on the scan tool.
Is the Lateral Accelerometer Sensor Input voltage less than the specified value?		 0.6 V Go to Step 6  Go to Step 9 
5 Test the lateral accelerometer signal circuit for the following conditions:
  • An open
  • A high resistance
  • A short to ground

Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 10  Go to Step 7 
6
  1. Inspect for poor connections at the harness connector of the yaw rate sensor/lateral accelerometer. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .
  2. Ensure the yaw rate sensor/lateral accelerometer is mounted securely and that the mounting bracket is not bent or otherwise damaged.
Did you find and correct the condition?		 - Go to Step 10  Go to Step 8 
7 Inspect for poor connections at the harness connector of the electronic brake control module (EBCM). Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .
Did you find and correct the condition?		 - Go to Step 10  Go to Step 9 
8
IMPORTANT: The Yaw Rate Reference Table Reset Procedure must be performed when you are instructed to do so during the Yaw Rate Sensor/Lateral Accelerometer Replacement procedure.
Replace the yaw rate sensor/lateral accelerometer. Refer to Yaw Rate Sensor/Lateral Accelerometer Replacement .Did you complete the replacement?		 - Go to Step 10  -
9
IMPORTANT: Following EBCM replacement, perform the set-up procedure for the EBCM and perform the Yaw Rate Reference Table Reset Procedure. Use the scan tool to perform the Tire Size Calibration procedure.
Replace the EBCM. Refer to Control Module References .Did you complete the replacement?		 - Go to Step 10  -
10
  1. Use the scan tool Clear All Class 2 DTCs function to clear all of the DTCs from all modules.
  2. Turn OFF the ignition for 5 seconds.
  3. Turn ON the ignition.
  4. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text.
Does the DTC reset?		 - Go to Step 3  System OK
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.