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 three sets of menus. The menus available depend on the number and type of systems on the vehicle and are listed below:

ABS Data:

A brief description of all ABS/ETS/TCS data parameters available on the The scan tool are listed below:

Left Front Wheel Speed: The The scan tool displays: Km/h / MPH--Display shows actual wheel speed

Right Front Wheel Speed: The The scan tool displays: Km/h / MPH--Display shows actual wheel speed

Left Rear Wheel Speed: The The scan tool displays: Km/h / MPH--Display shows actual wheel speed

Right Rear Wheel Speed: The The scan tool displays: Km/h / MPH--Display shows actual wheel speed

Engine Speed: The The scan tool displays: 0-10200 RPM--This is essentially a digital tachometer display

Brake Switch: The The scan tool displays: Applied/Released--This parameter indicates the state of the brake switch

Valve Relay State: The The scan tool displays: On/Off--This parameter indicates the state of the valve relay

Pump Monitor State: The The scan tool displays: On/Off--This parameter indicates the state of the return pump relay

TCS Switch State: The The scan tool displays: On/Off--This parameter indicates the state of the traction control switch

ETS Data:

A brief description of all ETS data parameters available on the The scan tool are listed below:

Engine Speed: The scan tool displays: 0-10200 RPM--This is essentially a digital tachometer display

Vehicle Speed: The scan tool displays: Km/h / MPH--Display shows actual vehicle speed

EBTCM to PCM Requested Torque: The scan tool displays: -100 to 510N·m--This parameter represents the requested engine torque from the EBCTM to the PCM

PCM to EBTCM Delivered Torque: The scan tool displays: -100 to 510N·m--This parameter represents the delivered engine torque from the PCM to the EBTCM

PCM Torque Reduction: The scan tool displays: Active/Inactive--This parameter indicates whether the PCM is actively reducing engine torque

PCM Inhibit of ETS: The scan tool displays: Yes/No--This parameter indicates if the PCM is temporally inhibiting ETS because of high catalytic converter temperature or the engine coolant temperature is outside the normal range

ETS Status EBTCM: The scan tool displays: Inable/Disable-- This parameter indicates the state of the ETS based on if the operator has disabled ETC by pressing the TRAC switch, or if the ETS is disabled because of a malfunction

ETS Status PCM: The scan tool displays: Inable/Disable--This parameter indicates if the PCM is permanently inhibiting ETC because the PCM has set a DTC(s) that turns on the CHECK ENGINE indicator

ETS State EBTCM: The scan tool displays: Active/Inactive--This parameter indicates if the ETS is currently in a ETS event or not

TCS Data:

A brief description of all TCS data parameters available on the The scan tool are listed below:

Engine Speed: The scan tool displays: 0-10200 RPM--This is essentially a digital tachometer display

Vehicle Speed: The scan tool displays: Km/h / MPH--Display shows actual vehicle speed

EBTCM to PCM Requested Torque: The scan tool displays: -100 to 510N·m--This parameter represents the requested engine torque from the EBCTM to the PCM

PCM to EBTCM Delivered Torque: The scan tool displays: -100 to 510N·m--This parameter represents the delivered engine torque from the PCM to the EBTCM

PCM Torque Reduction: The scan tool displays: -Active/Inactive--This parameter indicates whether the PCM is actively reducing engine torque

PCM Inhibit of TCS: The scan tool displays: Yes/No--This parameter indicates if the PCM is temporarily inhibiting TCS because of high catalytic converter temperature or the engine coolant temperature is outside the normal range

TCS Status EBTCM: The scan tool displays: Inable/Disable-- This parameter indicates the state of the TCS based on if the operator has disabled TCS by pressing the TRAC switch, or if the TCS is disabled because of a malfunction

TCS Status PCM: The scan tool displays: Inable/Disable--This parameter indicates if the PCM is permanently inhibiting TCS because the PCM has set a DTC(s) that turns on the CHECK ENGINE indicator

TCS State EBTCM: The scan tool displays: Active/Inactive--This parameter indicates if the TCS is currently in a TCS event or not

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.

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. In a vehicle equipped with ABS/TCS, the Special Functions are grouped as following:

ABS

TCS

In a vehicle equipped with ABS/ETS, the Special Functions are as follows:

ABS/ETS

The Special Functions are detailed below.

Lamp Test

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.

Automated Test

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.

Solenoid Tests (Inlet Valves)

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.

Solenoid Tests (Outlet Valves)

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.

Traction Control System Test

This test runs the pump motor and the applicable solenoid valves to apply fluid pressure to the front 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 front wheel by hand, they should not move, due to the pump motor running and applying pressure to the front wheels.