GM Service Manual Online
For 1990-2009 cars only
Table 1: Transfer Case Scan Tool Data Parameters (MF1A)
Table 2: Transfer Case Scan Tool Output Controls (MF1A)

Transfer Case Scan Tool Data Parameters (MF1A)

Parameter

System State

Expected Value

Definition

Operating Conditions: Engine ON

4WD WARN LIGHT

--

OFF

The scan tool displays ON or OFF. OFF if the 4WD indicator light is off and ON if the 4WD indicator light is on.

COOLANT TEMP

--

Varies

The scan tool displays °C or °F. This is the engine coolant temperature.

FL WHEEL SPD

--

Varies

The scan tool displays km/h (mph). This is the actual fly wheel speed.

FR WHEEL SPD

--

Varies

The scan tool displays km/h (mph). This is the front left wheel actual speed.

RL WHEEL SPD

--

Varies

The scan tool displays km/h (mph). This is the rear left wheel actual speed.

RR WHEEL SPD

--

Varies

The scan tool displays km/h (mph). This is the rear right wheel actual speed.

SLC CUR

--

Varies

The scan tool displays Amps. This is the SLC solenoid (4WD linear solenoid) current.

SLIP INDI LIGHT

--

OFF

The scan tool displays ON or OFF. OFF the slip indicator light is off and ON the slip indicator light is on.

STOP LIGHT SW

--

OFF

The scan tool displays ON or OFF. OFF the brake pedal is released and ON the brake pedal is depressed.

Transfer Case Scan Tool Output Controls (MF1A)

Scan Tool Output Control

Description

4WD INDIC

This command allows you to turn the 4WD indicator light On and Off.