Chevrolet Silverado / GMC Sierra. Service manual — part 2867

SCAN TOOL DATA DEFINITIONS

2WD High Indicator Light

This parameter displays On when the transfer case shift control module commands the 2WD
high indicator light On. The scan tool displays On or Off.

4WD High Indicator Light

This parameter displays On when the transfer case shift control module commands the 4WD
high indicator light On. The scan tool displays On or Off.

4WD Low Indicator Light

Mode Switch Return
Voltage

Transfer Case

Data

Volts

Varies

Mode Switch Selected

Transfer Case

Data

Auto 4WD/2 High/4High/4

Low/Neutral

2 High

Mode Switch Supply
Voltage

Transfer Case

Data

Volts

5 Volts

Neutral Indicator Light

Transfer Case

Data

On/Off

Off

Run/Crank

Transfer Case

Data

Active/Inactive

Active

Software Part Number

Transfer Case

Data

GM Part Number

Current Software

Release

Transfer Case Lock

Transfer Case

Data

Engaged/Disengaged

Disengaged

Transfer Case Motor

Transfer Case

Data

Amperage

0 Amps

Transfer Case Position

Transfer Case

Data

Current Transfer Case

Mode or Range

2 High

Trans. Fluid Temp

Transfer Case

Data

Degrees C

Varies

TR Switch Status

Transfer Case

Data

Current Transmission Gear

Park

Vehicle Speed

Transfer Case

Data

km/h

Varies

2008 Chevrolet Silverado 1500

2008 TRANSMISSION Transfer Case - MP 1625/1626-NQF - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &

Silverado

This parameter displays On when the transfer case shift control module commands the 4WD
low indicator light On. The scan tool displays On or Off.

Accessory Status

This parameter displays Not Active, and Active.

ATC Motor Init. Test

This parameter displays Not Initialized, Passed, Failed, or in Progress when the key off
initialization sequence has occurred.

Battery Voltage

This parameter displays the voltage measured by the transfer case shift control module at the
transfer case shift control module battery feed. The scan tool displays a range of 0-25.5
volts.

Front Axle Actuator

This parameter displays the voltage input to the front axle actuator from 0 - 25 volts.

Front Axle Actuator Status

This parameter displays either disengaged or engaged, engaged when the system is in Auto
4WD, 4WD, or 4WD Low modes, and disengaged when the mode is in neutral, or 2WD
mode.

Front Axle Switch

This parameter displays either locked or unlocked depending on the feedback from the front
axle actuator switch, which will be battery voltage when the vehicle is in a 4WD or Auto
4WD mode.

Incremental Impulse Sensor

This parameter displays the direction the incremental sensor is moving as clockwise or
counter clockwise.

Incremental Position Sensor Direction

This parameter displays the pulse width modulated voltage signal being supplied to the

2008 Chevrolet Silverado 1500

2008 TRANSMISSION Transfer Case - MP 1625/1626-NQF - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &

Silverado

incremental sensor via the transfer case control module.

Incremental Position Sensor

This parameter displays the position of the incremental sensor in degrees.

Incremental Position Sensor

This parameter displays the position of the incremental sensor in incremental sensor return
voltage.

Mode Switch Return Voltage

This parameter displays the transfer case shift control switch return voltage from 0-7.5 volts.

Mode Switch Selected

This parameter displays the transfer case shift control switch mode currently selected by the
driver.

Mode Switch Selected

This parameter displays the voltage being supplied to the transfer case shift control switch
by the transfer case control module from 0-7.5 volts.

Neutral Indicator Light

This parameter displays On when the transfer case shift control module commands the
neutral indicator light On. The scan tool displays On or Off.

Run/Crank

This parameter displays the status of the run/crank signal to the transfer case control module
as active or inactive.

Transfer Case Motor

This parameter displays the current draw in amperage that the motor is currently drawing
from the transfer case control module.

Transfer Case Position

2008 Chevrolet Silverado 1500

2008 TRANSMISSION Transfer Case - MP 1625/1626-NQF - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &

Silverado

This parameter displays the current mode the transfer case is in as indicated by the transfer
case control module.

Trans. Fluid Temp.

This parameter displays the transmission fluid temperature in degrees Celsius.

TR Switch Status

This parameter displays the current gear the transmission is in.

Vehicle Speed

This parameter displays vehicle speed in kilometers per hour.

Software Part Number

This parameter displays the numbers or characters assigned to the current version of
software used in the transfer case shift control module. The scan tool displays an
alphanumeric value.

DIAGNOSTIC TROUBLE CODE (DTC) LIST

DTC B0775

Diagnostic Instructions

DTC

Modules

DTC B0775

Electronic Transfer Case

DTC B0780

Electronic Transfer Case

DTC B0785

Electronic Transfer Case

DTC B0790

Electronic Transfer Case

DTC B2725

Electronic Transfer Case

DTC C0306

Electronic Transfer Case

DTC C0379

Electronic Transfer Case

DTC C0387

Electronic Transfer Case

DTC C0396

Electronic Transfer Case

DTC C0550

Electronic Transfer Case

DTC C0569

Electronic Transfer Case

DTC C0896

Electronic Transfer Case

2008 Chevrolet Silverado 1500

2008 TRANSMISSION Transfer Case - MP 1625/1626-NQF - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &

Silverado