Hummer H1 (2006+). Manual - part 112
OBD-292
On-Board Diagnostics
_____________________________________________
Inspect for the presence of an add-on engine power package. When engine horsepower or torque is increased over factory rating, a
shift flare condition may occur.
Step
Action
Value(s)
Yes
No
1
NOTE: Before clearing DTC(s) use the scan tool “Capture info”
to record Freeze Frame and Failure Records for reference, as data
will be lost when “Clear Info” function is used
Was the “On-Board Diagnostic (OBD) System Check” per-
formed?
Go to step 2.
Go to OBD Sys-
tem Check.
2
Measure the transmission fluid level. Refer to Transmission Fluid
Checking Procedure.
Is the transmission fluid level correct?
Go to Step 3
Go to Transmis-
sion Fluid
Checking Proce-
dure
3
1.
Install the scan tool.
2.
Start the engine.
NOTE:
• Before clearing the DTC, use the scan tool in order to
record the Freeze Frame and Failure Records for refer-
ence. The Clear Info function will erase the data.
• This diagnostic table should only be used if the DTC is
currently failing. If the DTC is not active, refer to Test-
ing for Intermittent Conditions and Poor Connections
in Wiring Systems until the DTC becomes active.
3.
Record the DTC Freeze Frame and Failure Records.
4.
Clear the DTC.
5.
Using the scan tool, measure ignition voltage.
Is voltage within the specified range?
9-18 Volts
Go to Step 4
Go to DTC
P0562 for low
voltage or DTC
P0563 for high
voltage
4
1.
Start the engine.
2.
Drive the vehicle under normal operating conditions.
3.
Using the scan tool, monitor engine, turbine and output
speed sensor readings.
Is speed sensor data erratic?
Go to the appro-
priate speed sen-
sor DTC
Go to Step 5
5
1.
Connect a 2,000 kPa (300 psi) pressure gage to the line pres-
sure tap.
2.
Use the scan tool in clutch test mode, to cycle through all
transmission ranges with the engine at idle and vehicle
brakes applied. Record line pressure in each range.
Was the line pressure low in a specific range or in ranges where
the same clutch was applied?
Go to Low Main
Line Pressure in
All Ranges
Go to Step 6
6
Conduct a clutch test for all forward ranges. Refer to Clutch Test
Did turbine speed remain at zero in all ranges?
Go to Diagnos-
tic Aids
Go to Step 7
7
1.
Remove the transmission oil pan. Refer to Automatic Trans-
mission Fluid/Filter Replacement.
2.
Inspect for signs of clutch failure.
Are there signs of a clutch failure?
Go to Step 8
Go to Step 9