GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2002 🢒 Yukon Denali 🢒 Brakes 🢒 Antilock Brake System 🢒 DTC C0288 or C088

Circuit Description

The EBCM supplies a reference voltage of 5 volts to the yaw rate sensor/lateral accelerometer and the master cylinder pressure sensor. The sensor supply voltage is monitored via an internal feedback circuit to the EBCM microprocessor.

Conditions for Running the DTC

The ignition is ON.

Conditions for Setting the DTC

The EBCM detects that the sensor supply voltage is less than 4.75 volts or greater than 5.25 volts for 200 milliseconds.

Action Taken When the DTC Sets
    • The EBCM disables the VSES.
    • The EBCM discontinues the output of the 5-volt reference signal to the external sensors.
    • The message center displays the SERVICE STABILITY SYSTEM message.

Conditions for Clearing the DTC

The conditions for setting the DTC are no longer present and you use the scan tool Clear DTCs function.

Diagnostic Aids

Thoroughly inspect connections or circuitry that may cause an intermittent malfunction. Refer to the following:

    •  Testing for Electrical Intermittents
    •  Testing for Intermittent Conditions and Poor Connections
    •  Wiring Repairs
    •  Connector Repairs

Test Description

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

  1. This step tests for a shorted master cylinder pressure sensor.

    2.

  2. This step tests for a shorted yaw rate sensor/lateral accelerometer.

Step

Action

Yes

No

Schematic Reference: Antilock Brake System Schematics

1

Did you perform the ABS Diagnostic System Check?

Go to Step 2

Go to Diagnostic System Check - ABS

2

Use a scan tool in order to clear the DTCs.

Does the DTC reset?

Go to Step 3

Go to Diagnostic Aids

3

  1. Turn OFF the ignition.
  2. Disconnect the master cylinder pressure sensor harness connector. Refer to Brake Fluid Pressure Sensor Replacement .
  3. Turn ON the ignition.
  4. Use a scan tool in order to clear the DTC.

Does the DTC reset?

Go to Step 4

Go to Step 7

4

  1. Turn OFF the ignition.
  2. Reconnect the master cylinder pressure sensor harness connector.
  3. Disconnect the yaw rate sensor/lateral accelerometer harness connector. Refer to Vehicle Yaw Sensor with Vehicle Lateral Accelerometer Replacement .
  4. Turn ON the ignition.

Does the DTC reset?

Go to Step 5

Go to Step 8

5
  1. Turn OFF the ignition.
  2. Disconnect from the EBCM, the harness connector containing both 5-volt reference circuits.
  3. Test each 5-volt reference circuit for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 10

Go to Step 6

6
  1. Turn ON the ignition.
  2. Test each 5-volt reference circuit for a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 10

Go to Step 9

7

Replace the master cylinder pressure sensor. Refer to Brake Fluid Pressure Sensor Replacement .

Did you complete the replacement?

Go to Step 10

--

8

Replace the yaw rate sensor/lateral accelerometer. Refer to Vehicle Yaw Sensor with Vehicle Lateral Accelerometer Replacement .

Did you complete the replacement?

Go to Step 10

--

9

Important: Following EBCM replacement, use the scan tool to perform the Tire Size Calibration procedure.

Replace the EBCM. Refer to Electronic Brake Control Module Replacement .

Did you complete the replacement?

Go to Step 10

--

10
  1. Use the scan tool in order to clear the DTCs.
  2. 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