Hummer H2. Manual — part 758

SCAN TOOL OUTPUT CONTROLS

Scan Tool Output Controls

module (PCM)

Does the scan tool communicate
with all control modules?

Go to Step 3

Go to Scan Tool Does Not

Communicate with Class 2

Device in Data Link

Communications

3

Select the display DTCs function
on the scan tool for the following
control modules:

z

Electronic brake control
module (EBCM)

z

Powertrain control module
(PCM)

Does the scan tool display any
DTCs?

Go to Step 4

Go to Symptoms - Anti-lock

Brake System

4

Does the scan tool display any
DTCs which begin with a "U"?

Go to Diagnostic Trouble

Code (DTC) List in Data

Link Communications

Go to Step 5

5

Does the scan tool display DTCs
which begin with a "B"?

Go to Diagnostic Trouble

Code (DTC) List in Body

Control System

Go to Step 6

6

Does the scan tool display DTCs
which begin with a "P"?

Go to Diagnostic Trouble

Code (DTC) List in Engine

Electrical

Go to Diagnostic Trouble Code

(DTC) List

Scan Tool Output

Control

Additional Menu

Selection(s)

Description

Automated Bleed
Procedure

-

Used in order to bleed ABS hydraulics. Refer to ABS
Automated Bleed Procedure .

ABS Warning Lamp

-

Commands the ABS indicator ON and OFF.

LF Inlet Valve
Solenoid

Solenoid Test

Commands the solenoid ON and OFF.

LF Outlet Valve
Solenoid

Solenoid Test

Commands the solenoid ON and OFF.

LR Inlet Valve
Solenoid

Solenoid Test

Commands the solenoid ON and OFF.

LR Outlet Valve
Solenoid

Solenoid Test

Commands the solenoid ON and OFF.

RF Inlet Valve
Solenoid

Solenoid Test

Commands the solenoid ON and OFF.

2004 Hummer H2

2004 BRAKES Anti-Lock Brake System - Hummer H2

SCAN TOOL DATA LIST

The EBCM Scan Tool Data Lists contain all the anti-lock brake system related parameters that are available on
the scan tool. The parameters on the list are arranged in alphabetical order. The "Column" data list shows the
location of the parameter on the scan tool displayed menu selections.

Use the EBCM Scan Tool Data Lists as directed by a diagnostic table or in order to supplement the diagnostic
procedures. Begin all the diagnostic procedures with the ABS Diagnostic Starting Point. Use the EBCM Scan
Tool Data Lists only after the following is determined:

z

There is no published DTC procedure nor published symptom procedure for the customer concern.

OR

z

The DTC or symptom diagnostic procedure indicated by the diagnostic system check does not resolve the
customer concern.

The Typical Data Values are obtained from a properly operating vehicle under the conditions specified in the
first row of the Scan Tool Data List table. Comparison of the parameter values from the suspect vehicle with the
Typical Data Values may reveal the source of the customer concern.

EBCM Scan Tool Data List

RF Outlet Valve
Solenoid

Solenoid Test

Commands the solenoid ON and OFF.

RR Inlet Valve
Solenoid

Solenoid Test

Commands the solenoid ON and OFF.

RR Outlet Valve
Solenoid

Solenoid Test

Commands the solenoid ON and OFF.

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Ignition is ON, engine OFF, and vehicle is stationary

ABS Active

ABS

Yes/No

No

Brake Fluid Level

ABS

OK/Low

OK

Brake Switch

ABS

Applied/Released

Released

DRP Active

ABS

Yes/No

No

DRP Disabled

ABS

Yes/No

No

Front TCS Isolation Solenoid

TCS

Active/Inactive

Inactive

Front TCS Prime Solenoid

TCS

Active/Inactive

Inactive

Ignition Voltage Signal

ABS

Volts

B+

Left Front Wheel Speed

ABS

km/h or mph

0

Left Rear Wheel Speed

ABS

km/h or mph

0

LF Inlet Valve Solenoid

ABS

Active/Inactive

Inactive

LF Outlet Valve Solenoid

ABS

Active/Inactive

Inactive

Longitudinal Accelerometer

TCS

Volts

0

2004 Hummer H2

2004 BRAKES Anti-Lock Brake System - Hummer H2

SCAN TOOL DATA DEFINITIONS

Data Display/Definitions

The Scan Tool Data Display/Definitions contains a brief description of all the ABS/TCS data parameters. The
menus available depend on the number and type of system on the vehicle and are listed below in alphanumeric
order.

z

ABS DATA

z

TCS DATA

ABS Active

The scan tool displays Yes or No. The scan tool will display Yes when the ABS is active and No during
normal vehicle operation.

Brake Fluid Level

The scan tool will display OK/Low depending on the state of the Master Cylinder Fluid Level Switch.

Brake Switch

The scan tool will display Applied or Released depending on the state of the brake switch.

DRP Active

The scan tool will display Yes/No depending on the state of the DRP.

DRP Disabled

Loose Surface Mode (TC2)

TCS

Disabled/Enabled

Disabled

LR Inlet Valve Solenoid

ABS

Active/Inactive

Inactive

LR Outlet Valve Solenoid

ABS

Active/Inactive

Inactive

Pump Motor Relay Command

ABS

On/Off

Off

Rear TCS Isolation Solenoid

TCS

Active/Inactive

Inactive

Rear TCS Prime Solenoid

TCS

Active/Inactive

Inactive

RF Inlet Valve Solenoid

ABS

Active/Inactive

Inactive

RF Outlet Valve Solenoid

ABS

Active/Inactive

Inactive

Right Front Wheel Speed

ABS

km/h or mph

0

RR Inlet Valve Solenoid

ABS

Active/Inactive

Inactive

RR Outlet Valve Solenoid

ABS

Active/Inactive

Inactive

Right Rear Wheel Speed

ABS

km/h or mph

0

Solenoid Valve Relay Command

ABS

On/Off

On

TCS Active

TCS

Yes/No

No

2004 Hummer H2

2004 BRAKES Anti-Lock Brake System - Hummer H2

The scan tool will display Yes/No depending on the state of the DRP.

Front TCS Isolation Solenoid

The scan tool will display Active/Inactive. This displays the commanded state of the solenoid valve.

Front TCS Prime Solenoid

The scan tool will display Active/Inactive. This displays the commanded of the solenoid valve.

Ignition Voltage

The scan tool displays 0-17 Volts. The scan tool displays the level of ignition voltage at the EBCM.

Left Front Wheel Speed

The scan tool displays 0-255 km/h or (0-158 mph). The scan tool displays the actual speed of the left
front wheel.

Left Rear Wheel Speed

The scan tool displays 0-255 km/h or (0-158 mph). The scan tool displays the actual speed of the left rear
wheel.

LF Inlet Valve Solenoid Inactive

The scan tool will display Active or Inactive. The scan tool displays the commanded state of the LF inlet
solenoid valve.

LF Outlet Valve Solenoid Inactive

The scan tool will display Active or Inactive. The scan tool displays the commanded state of the LF outlet
solenoid valve.

Longitudinal Accelerometer Sensor

The scan tool will display Volts. The scan tool displays the longitudinal accelerometer signal received
from the sensor.

Loose Service Mode

The scan tool displays Disabled/Enabled. The scan tool displays the switch state.

LR Inlet Valve Solenoid Inactive

The scan tool displays Active or Inactive. The scan tool displays the commanded state of the LR inlet

2004 Hummer H2

2004 BRAKES Anti-Lock Brake System - Hummer H2