Hummer H1 Service Manual page 217

5-18 Transmission/Transfer Case
Step
16 Clear TRANS ADAPT.
Is the proceedure complete?
17 Add new fluid.
Is the proceedure complete?
18 Change the fluid and the filter.
Is the procedure complete?
19 Clear TRANS ADAPT.
Is the procedure complete?
20 Is the fluid level satisfactory? If not, correct as
needed.
21 Perform the Functional Test Procedure.
Is the functional test completed?
SCAN TOOL DIAGNOSIS
NOTE: The Tech 1 Scan Tool (Figure 5-20) checks function of
the solenoids, sensors, and PCM. The scan tool connector is
attached to the vehicle data link connector (Figure 5-21).The
vehicle requires use of a VIM (Vehicle Interface Mod ule), part
number 7000041.
The scan tool provides data on individual circuits, or on all the
related electrical components in snap shot mode.
The PCM memory and circuits are interrogated by the scan tool.
The tool reads diagnostic trouble codes (DTC) and displays fault
and performance parameters.
Figure 5-20: Tech 1 Scan Tool
_____________________________________________
Transmission Fluid Checking Procedure
Action
S05-008
Value(s)
DATA LINK
CONNECTOR
Figure 5-21: Data Link Connector
Transmission Warning Lamps
All Hummer vehicles are equipped with a malfunction indica-
tor light (check engine) and a check throttle light. The purpose
of the lights is to alert the driver when a transmission/engine,
or electronic accelerator pedal circuit fault has occurred.
The warning lights are in circuit with the PCM, which controls
light operation. The lights are illuminated for a few seconds at
startup as part of a bulb check and circuit self test routine. The
only other time illumination occurs, is when a system compo-
nent or circuit fault occurs.
Yes No
Go to step 17
Go to step 20
Go to step 10
Go to step 20
Go to step 21
System is OK
I.P.
COURTESY LIGHT
HARNESS
I.P. CLOSEOUT PANEL
(SHOWN DETACHED)
®