Hummer H1 Service Manual page 212

____________________________________________
®
Step
1 Perform the Transmission Fluid Checking Proce-
dure.
Fill the reservoir to the suggested level.
Is the fluid level correct?
2 Check for PCM trouble codes, both current and
history.
Are PCM trouble codes present?
3 Perform the Road Test Procedure.
Was the condition Duplicated?
4 Is a harsh or soft shift condition present?
5 Is the vehicle's performance poor?
6 Is the engagement into Drive or Reverse delayed
or missing?
7 Perform the Line Pressure Checking Procedure.
Is the line pressure correct?
8 Inspect the transmission wire harness connectors
and the transmission range switch.
Was the problem found and corrected?
9 Is vibration or noise a concern?
10 Is the fluid leaking?
11 Are other transmission conditions present?
12 Was the condition corrected?
05745159
Functional Test Procedure
Action
Transmission/Transfer Case
Value(s) Yes
Go to step 2
Go to the Diag-
nostic Trouble
Code Charts
Go to step 4
Go to step 7
Go to Torque
converter Clutch
Diagnosis
Go to step 7
Go to step 8
System OK
Refer to Fly-
wheel/Torque
Converter
Vibration test
Locate and
repair leak
Refer to Symp-
tom Diagnosis
Tables
Exit Table
5-13
No
Go to step 3
Go to step 12
Go to step 5
Go to step 6
Go to step 9
Refer to symp-
tom Diagnosis
Tables
Refer to symp-
tom Diagnosis
Tables
Go to step 10
Go to step 11
Go to Step 12
Go to step 1