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Hummer H3. Manual - part 717

No Drive

No engine braking

Shift selector indicator does not match
transmission gear range

Lack of power or hesitation

Refer to No Drive in Drive Range.

Refer to No Overrun Braking -
Manual 3-2-1.

Refer to Range Selector Displays
Incorrect Range.

Refer to Lack of Power or Hesitation.

Shift Quality (Feel) Diagnosis:
This category contains the following topic:

Harsh, soft or slipping shifts

Harsh, soft or delayed engagement

Shift shudder, flare or tie-up

Refer to Harsh Shifts.

Refer to Slipping or Harsh 1-2 Shift.

Refer to No 2-3 Shift or 2-3 Shift
Slips, Rough or Hunting.

Refer to No 3-4 Shift, Slips or Rough
3-4 Shift.

Refer to Harsh Garage Shift.

Refer to Delay in Drive and Reverse.

Refer to 3-2 Flare or Tie-Up.

Shift Pattern:
This category contains the following topics:

One forward gear only

Two forward gears only

Gear missing or slipping

No upshift or slipping upshift

No downshifts

Non-First gear start

Refer to First Gear Range Only - No
Upshift.

Refer to Third Gear Only.

Refer to Second/Third Gear Only or
First/Fourth Gears Only.

Refer to Slips in First Gear.

Refer to Slipping or Harsh 1-2 Shift.

Refer to No 2-3 Shift or 2-3 Shift
Slips, Rough or Hunting.

Refer to No 3-4 Shift, Slips or Rough
3-4 Shift.

Refer to No Part Throttle or Delayed
Downshifts.

Refer to Second Gear Start.

Shift Speed Diagnosis:
This category contains the following topic:
Inaccurate or inconsistent shift points

Refer to Inaccurate Shift Points.

Torque Converter Diagnosis:
This category contains the following topics:

Refer to Torque Converter Diagnosis.

2007 Hummer H3

2007 TRANSMISSION Automatic Transmission - 4L60-E/4L65-E/4L70-E - H3

RANGE SELECTOR DISPLAYS INCORRECT RANGE

Fig. 1: Transmission Range (TR) Switch Circuit Schematic
Courtesy of GENERAL MOTORS CORP.

Torque converter diagnosis

TCC does not apply

TCC does not release

TCC apply/release quality

Refer to No Torque Converter
Clutch Apply (300 RPM Slip).

Refer to No Torque Converter
Clutch Release.

Refer to Torque Converter Clutch
Shudder.

Indicator On or Message Center Displays
Message:
This category contains the following topics:
Message Center displays "change trans fluid"

Refer to Transmission Component and
System Description.

If symptom is not found

Refer to Transmission Fluid Check.

Refer to Road Test.

Refer to Line Pressure Check.

2007 Hummer H3

2007 TRANSMISSION Automatic Transmission - 4L60-E/4L65-E/4L70-E - H3

Circuit Description

The transmission range (TR) switch is part of the park/neutral position (PNP) and back-up lamp
switch assembly, which is externally mounted on the transmission manual shaft. The TR switch
contains four internal switches that indicate the transmission gear range selector lever position.
The powertrain control module (PCM) supplies ignition voltage to each switch circuit. As the
gear range selector lever is moved, the state of each switch may change, causing the circuit to
open or close. An open circuit or switch indicates a high voltage signal. A closed circuit or switch
indicates a low voltage signal. The PCM detects the selected gear range by deciphering the
combination of the voltage signals. The PCM compares the actual voltage combination of the
switch signals to a TR switch combination chart stored in memory.

Diagnostic Aids

Refer to the Transmission Range Switch Logic table for valid combinations of switch signal
circuits A, B, C and Parity. On the table, HI indicates an ignition voltage signal. LOW indicates a
zero voltage signal.

Test Description

The numbers below refer to the step numbers on the diagnostic table.

4: By disconnecting the TR switch, the ground path of all TR switch circuits is removed and
the PCM should recognize all circuits as open. The scan tool should display HI for all range
signal states.

5: This step tests the TR switch wiring for an open or the lack of the signal voltage from the
PCM.

6: This step tests the TR switch wiring and the PCM by providing a ground path through a
fused jumper wire. When grounded, the scan tool range signal states should change to LOW.

7: This step tests the TR switch wiring and the PCM by providing a ground path through a
fused jumper wire. When grounded, the scan tool range signal states should change to LOW.

8: This step tests the TR switch wiring and the PCM by providing a ground path through a
fused jumper wire. When grounded, the scan tool range signal states should change to LOW.

9: This step tests the TR switch wiring and the PCM by providing a ground path through a
fused jumper wire. When grounded, the scan tool range signal states should change to LOW.

Range Selector Displays Incorrect Range

Step

Action

Values

Yes

1. Install a scan tool.

2007 Hummer H3

2007 TRANSMISSION Automatic Transmission - 4L60-E/4L65-E/4L70-E - H3

2. Turn ON the ignition, with the

engine OFF.

3. Select TR Sw. on the scan

tool.

4. With the scan tool, observe the

TR Sw. display while selecting
each transmission range: P, R,
N, D4, D3, D2 and D1.

Does each selected transmission
range match the scan tool TR Sw.
display?

Go to Step 2 Go to Step 3

Observe the instrument panel cluster
(IPC) gear range display while
selecting each transmission range: P,
R, N, D4, D3, D2, D1.
Does each selected transmission
range match the IPC display?

Go to Testing

for

Intermittent

Conditions

and Poor

Connections

Go to Step

With the scan tool, observe the TR
Sw. A/B/C/P display.
Does the scan tool TR Sw. A/B/C/P
parameter indicate HI for all range
signal states?

Go to Step 13 Go to Step 4

1. Turn OFF the ignition.

2. Disconnect the TR switch

connector.

3. Turn ON the ignition, with the

engine OFF.

Does the scan tool TR Sw. A/B/C/P
parameter indicate HI for all range
signal states?

Go to Step 5

Go to Step

1. Using the DMM and the J

35616 Terminal Test Kit,
measure the voltage from the
signal A circuit of the TR
switch connector to ground.

2007 Hummer H3

2007 TRANSMISSION Automatic Transmission - 4L60-E/4L65-E/4L70-E - H3

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