Hummer H1 Service Manual page 316

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Step
1 Was the Powertrain On-Board Diagnostic (OBD) Sys-
tem Check performed?
2 Perform the Transmission Fluid Checking Procedure.
Refer to Line Pressure Check Procedure.
Did you perform the procedure?
3 1. Install the scan tool (Tech 2).
2. With the engine OFF, turn the ignition switch to
the RUN position.
Important: Before clearing the DTCs, use the scan
tool in order to record the Freeze Frame and Failure
Records for reference. The Clear Info function will
erase the data.
3. Record the DTC Freeze Frame and Failure
Records.
4. With the engine idling and at normal operating
temperature, apply the brake pedal.
5. Select each transmission range: D1, D2, D3, D4,
N, R and P.
Does each selected transmission range match the scan
tool TFP Switch A/B/C display? (Refer to the Range
Signal table.)
4 1. Connect the J–21867 Pressure Gauge to the trans-
mission line pressure tap.
2. Perform the Line Pressure Check.
3. Refer to Line Pressure Check Procedure.
4. Is the line pressure within specifications?
5 Drive the vehicle under the following conditions:
• The transmission is in D4.
• The TCC is engaged.
• The APP angle is 12-70%.
At any time is the TCC Slip Speed within the specified
range for 1 second?
6 Drive the vehicle under the following conditions:
• The transmission is in D3.
• Command the TCC ON with the scan tool.
• The APP angle is 12-70%.
At any time is the TCC Slip Speed within the specified
range for 6 seconds?
05745159
DTC P1870 Transmission Component Slip
Action
Transmission/Transfer Case
Value
—
Go to Step 2
—
Go to Step 3
—
Go to Step 4
—
Go to Step 5
140-500 RPM
Go to Step 6
140-500 RPM
Go to Step 8
5-117
Yes No
Go to Power-
train OBD
System Check
Go to Trans-
mission Fluid
Checking Pro-
cedure
Go to DTC
P1810 Pres-
sure Switch
Assembly
Malfunction
Go to the
applicable
System Diag-
nosis Table:
Low Line
Pressure
High Line
Pressure
Go to Diag-
nostic Aids
Go to Step 7