Refer to the Scan Tool Manual for complete information on scan tool diagnostics.

Diagnostic Trouble Codes (DTC)

The Diagnostic Trouble Codes (DTC) function has three modes that are described below:

Data Display

The Data Display function contains a list of ABS and TCS data parameters. A brief description of all ABS/TCS data parameters available on the scan tool are listed below:

Snapshot

In this test mode, the scan tool captures the data listed in the data displays before and after a snapshot triggering condition which may or may not set a DTC.

ABS Programming

Replacement EBTCMs require coding to be programmed in to the EBTCM memory. Program the EBTCM if a new EBTCM is installed in a vehicle. If a EBTCM is installed without being programmed, DTC C0551 (Option Configuration Error) will be set and Traction Control will be disabled. The programming is performed with the scan tool. When ABS Programming is performed with the scan tool, the engine type and the transmission type are coded into the EBTCM memory. The EBTCM requires the engine and transmission coding for TCS operation.

Special Functions

In this test mode, the scan tool can be used to perform functional tests on the ABS/TCS which help verify proper operation. Malfunction conditions can be further identified by testing and observing the test results. DTCs must be cleared before any tests in Special Functions can be performed. The Special Functions are listed below:

The Special Functions are detailed below.

This test allows activation of the following indicators:

The Lamp Test aids in diagnosing indicator malfunctions. The test allows the operator to flash the indicator on and off manually.

The Automated Test cycles each valve solenoid and the pump motor (as well as the necessary relays) to check component operation. If a malfunction is detected, the EBTCM will set DTC(s), which will be displayed upon completion of the test. Perform the test as follows:

1. Ignition OFF.
2. Install the scan tool.
3. Turn ignition to RUN.
4. Select the scan tool's Special Functions.
5. Select the Automated Test.
6. Run the Automated Test.
7. Note any DTCs set.

The Solenoid Test for inlet valves activates the selected wheel circuit Inlet valve placing it in the pressure hold position. When in the pressure hold position, the valve will not allow master cylinder pressure to be delivered to the hydraulic wheel circuit. This is done under ABS operating conditions because the EBTCM has determined that the wheel is moving too slowly, so it holds additional master cylinder pressure from it in an attempt to allow it to rotate at an appropriate speed. The scan tool commands the valve to close, which should allow the technician to spin the wheel even though an assistant is applying pressure to the brake pedal. Perform the test as follows:

1. Ignition OFF.
2. Install the scan tool.
3. Turn ignition to RUN.
4. Raise vehicle such that wheels are about 6 inches off the floor with the transmission in neutral.
5. Select the scan tool's Special Functions.
6. Select Solenoid Test. Have an assistant command Hold Pressure with the scan tool.
7. Have the assistant press and hold the brake pedal.
8. Attempt to move the wheel being tested by hand; it should move even though the assistant is applying pressure to the brake pedal. The wheels may be difficult to turn by hand, but can be moved if the system is working properly.

The Solenoid Test for outlet valves activates the selected hydraulic wheel circuit valves, placing them in the pressure release position. When in the pressure release position, the valve will allow wheel caliper pressure to be returned to the master cylinder circuit. This is done under ABS operating conditions because the EBTCM has determined that the wheel is moving too slowly, and holding additional master cylinder pressure from it has not allowed it to rotate at an appropriate speed. The scan tool commands the valves to these positions which should allow the technician to spin the wheel even though an assistant is applying pressure to the brake pedal. Perform the test as follows:

1. Ignition OFF.
2. Install the scan tool.
3. Turn ignition to RUN.
4. Raise vehicle such that wheels are about 6 inches off the floor with the transmission in neutral.
5. Have an assistant press and hold the brake pedal.
6. Select the scan tools Special Functions.
7. Select Solenoid Test. Have the assistant command Release Pressure with the scan tool.
8. Attempt to move the wheel being tested by hand; it should move even though the assistant is applying pressure to the brake pedal. The wheels may be difficult to turn by hand, but can be moved if the system is working properly.

This test runs the pump motor and the applicable solenoid valves to apply fluid pressure to the rear wheel circuits.

Perform the test as follows (this test does NOT require an assistant):

1. Ignition OFF.
2. Install the scan tool.
3. Turn ignition to RUN.
4. Raise vehicle so that wheels are about 6 inches off the floor with the transmission in neutral.
5. Select the scan tools Special Functions.
6. Select TCS Test.
7. Command the TCS Test on with the scan tool. The pump motor will turn on for approximately 25 seconds.
8. Attempt to move each rear wheel by hand, they should not move, due to the pump motor running and applying pressure to the rear wheels.