Hummer H2. Manual — part 2416

Fig. 4: Transmission Range (TR) Switch Diagram
Courtesy of GENERAL MOTORS CORP.

Circuit Description

The transmission range (TR) switch is part of the park/neutral position and back-up lamp switch assembly and
is externally mounted on the transmission manual shaft. The TR switch is a multi-signal switch. The PCM
supplies ignition voltage to the TR switch on four signal circuits, A, B, C, and P. Each gear selector lever
position grounds one or more of the switch circuits. In order to determine the gear range selected by the driver,
the PCM compares the voltage combinations on the signal circuits to a look up table stored in the PCM
memory. PCM detects the selected gear range by the state change of the switch input. Refer to Transmission
Range Switch Logic table.

Switch input to the PCM is represented on the scan tool as HI and Low. HI indicates an ignition voltage signal.
Low indicates a zero voltage signal. The four parameters represent transmission range switch signal A, B, C and
Parity.

DTC P0706 will set if the PCM detects start-up in a drive range or vehicle speed in the PARK or NEUTRAL
range. DTC P0706 is a type C DTC.

Conditions for Running the DTC

Transmission is in D4.

Conditions for Setting the DTC

Condition 1

The PCM detects DRIVE or REVERSE at vehicle start-up.

Condition 2

The PCM detects PARK or NEUTRAL and the following conditions occur for 10 seconds:

z

TP is 5 percent or greater.

z

Engine torque is greater than 68 N.m (50 lb ft).

z

VSS is 32 km/h (20 mph) or greater.

Action Taken When the DTC Sets

z

The PCM will use TFP Switch to determine gear range.

z

The PCM does not illuminate the malfunction indicator lamp (MIL).

z

The PCM records the operating conditions when the Conditions for Setting the DTC are met. The PCM
stores this information as Failure Records.

z

The PCM stores DTC P0706 in PCM history.

2004 Hummer H2

2004 TRANSMISSION Automatic Transmission - 4L60-E/4L65-E Diagnosis (DTC P0218 To DTC P2771) - Hummer H2

Conditions for Clearing the DTC

z

A scan tool can clear the DTC.

z

The PCM clears the DTC from PCM history if the vehicle completes 40 warm-up cycles without a non-
emission related diagnostic fault occurring.

z

The PCM cancels the DTC default actions when the fault no longer exists and the DTC passes.

Test Description

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

5: By disconnecting the transmission range switch, the ground path of all TR switch circuits would be
removed and the PCM would recognize all circuits as open. The scan tool will display HI for all range
signals.

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

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

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

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

DTC P0706

Step

Action

Value

(s)

Yes

No

1

Did you perform the Diagnostic System
Check - Engine Controls?

-

Go to Step 2

Go to Diagnostic

System Check -

Engine Controls in

Engine Controls -

6.0L (LQ4)

2

1. Install a scan tool.

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, D3, D2 and
D1.

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

-

Go to Intermittent

Conditions in Engine

Controls - 6.0L (LQ4)

Go to Step 3

1. Inspect the PNP switch assembly for the

following:

2004 Hummer H2

2004 TRANSMISSION Automatic Transmission - 4L60-E/4L65-E Diagnosis (DTC P0218 To DTC P2771) - Hummer H2

3

z

Damage

z

Loose or missing mounting
hardware

z

Proper adjustment

Refer to Park/Neutral Position
Switch Replacement .

2. Inspect the shift cable for the following:

z

Damaged or stretched cable

z

Proper adjustment

Refer to Automatic
Transmission Range Selector
Cable Replacement .

Did you find and correct a condition?

-

Go to Step 16

Go to Step 4

4

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 5

5

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 6

Go to Step 10

6

1. Using the DMM and the J 35616 GM

Terminal Test Kit, measure the voltage
from terminal 8 of the TR switch
connector to ground.

2. Measure the voltage from terminal 4 of

the TR switch connector to ground.

3. Measure the voltage from terminal 6 of

the TR switch connector to ground.

4. Measure the voltage from terminal 5 of

the TR switch connector to ground.

Does the voltage measure within the specified
value at all four terminals?

10-12

V

Go to Step 7

Go to Step 11

Connect a fused jumper wire from terminal 5
of the TR switch connector, signal A circuit,

2004 Hummer H2

2004 TRANSMISSION Automatic Transmission - 4L60-E/4L65-E Diagnosis (DTC P0218 To DTC P2771) - Hummer H2

7

to ground while monitoring the scan tool TR
Sw. A/B/C/P parameter.
When the signal A circuit is grounded, do any
other signal circuits indicate LOW?

-

Go to Step 12

Go to Step 8

8

Connect a fused jumper wire from terminal 4
of the TR switch connector, signal B circuit,
to ground while monitoring the scan tool TR
Sw. A/B/C/P parameter.
When the signal B circuit is grounded, do any
other signal circuits indicate LOW?

-

Go to Step 12

Go to Step 9

9

Connect a fused jumper wire from terminal 6
of the TR switch connector, signal C circuit,
to ground while monitoring the scan tool TR
Sw. A/B/C/P parameter.
When the signal C circuit is grounded, do any
other signal circuits indicate LOW?

-

Go to Step 12

Go to Step 14

10

Test the signal circuit or circuits of the TR
switch that did not indicate HI for a short to
ground.
Refer to Testing for Short to Ground and
extxref document="029_body-21"
filetype="sgml" extrefid="i162420">Wiring
Repairs in Wiring Systems.
Did you find and correct the condition?

-

Go to Step 16

Go to Step 15

11

Test the signal circuit or circuits of the TR
switch that did not indicate proper voltage for
an open.
Refer to Testing for Continuity and extxref
document="029_body-21" filetype="sgml"
extrefid="i162420">Wiring Repairs in Wiring
Systems.
Did you find and correct the condition?

-

Go to Step 16

Go to Step 15

12

Test the affected signal circuits of the TR
switch for a shorted together condition.
Refer to Circuit Testing and extxref
document="029_body-21" filetype="sgml"
extrefid="i162420"> Wiring Repairs in
Wiring Systems.
Did you find and correct the condition?

-

Go to Step 16

Go to Step 15

13

Test the ground circuit of the TR switch for an
open.
Refer to Testing for Continuity and extxref
document="029_body-21" filetype="sgml"
extrefid="i162420">Wiring Repairs in Wiring
Systems.
Did you find and correct the condition?

-

Go to Step 16

Go to Step 14

2004 Hummer H2

2004 TRANSMISSION Automatic Transmission - 4L60-E/4L65-E Diagnosis (DTC P0218 To DTC P2771) - Hummer H2