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Hummer H3. Manual - part 718

2. Measure the voltage from the

signal B circuit of the TR
switch connector to ground.

3. Measure the voltage from the

signal C circuit of the TR
switch connector to ground.

4. Measure the voltage from the

signal P circuit of the TR
switch connector to ground.

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

10-12 V

Go to Step 6

Go to Step

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

Go to Step 12 Go to Step 7

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

Go to Step 12 Go to Step 8

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

Go to Step 12 Go to Step 9

Connect a fused jumper wire from
the TR switch connector, signal
circuit P, to ground while

2007 Hummer H3

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

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

Go to Step 12

Go to Step

Test the signal circuits of the TR
switch that did not indicate HI for a
short to ground. Refer to Circuit
Testing and Wiring Repairs .
Did you find and correct the
condition?

Go to Step 17

Go to Step

Test the signal circuits of the TR
switch that did not indicate proper
voltage for an open. Refer to
Circuit Testing and Wiring
Repairs .
Did you find and correct the
condition?

Go to Step 17

Go to Step

Test the affected signal circuits of
the TR switch for a shorted together
condition. Refer to Circuit Testing
and Wiring Repairs .
Did you find and correct the
condition?

Go to Step 17

Go to Step

Test the ground circuit of the TR
switch for an open. Refer to Circuit
Testing and Wiring Repairs .
Did you find and correct the
condition?

Go to Step 17

Go to Step

Replace the TR switch, this switch
is part of the park/neutral position
switch. Refer to Park/Neutral
Backup Switch Replacement.
Did you complete the replacement?

Go to Step 17

Replace the PCM. Refer to Control
Module References .
Did you complete the replacement?

Go to Step 17

Replace the IPC. Refer to Control

2007 Hummer H3

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

TRANSMISSION FLUID CHECK

This procedure checks the transmission fluid level, as well as the condition of the fluid itself.

Before checking the fluid level, perform the following:

1. Start the engine and park the vehicle on a level surface. Keep the engine running.

2. Apply the parking brake and place the shift lever in PARK (P).

3. Depress the brake pedal and move the shift lever through each gear range, pausing for about

3 seconds in each range. Then, move the shift lever back to PARK (P).

4. Allow the engine to idle 500-800 RPM for at least 1 minute. Slowly release the brake

pedal.

5. Keep the engine running and observe the transmission fluid temperature (TFT) using the

Driver Information Center (DIC) or a scan tool.

6. Using the TFT reading, determine and perform the appropriate check procedure. If the TFT

reading is not within the required temperature ranges, allow the vehicle to cool or operate
the vehicle until the appropriate TFT is reached.

Cold Check Procedure

Module References .
Did you complete the replacement?

Go to Step 17 Go to Step 2

1. Turn ON the ignition, with the

engine OFF.

2. 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?

System OK

Go to Step 2

NOTE:

Always use the proper automatic transmission fluid listed. Using
incorrect automatic transmission fluid may damage the vehicle.

IMPORTANT: Use the cold check procedure only as a reference to

determine if the transmission has enough fluid to be

2007 Hummer H3

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

1. Start the engine and locate the transmission dipstick at the rear of the engine compartment,

on the passenger's side of the vehicle.

2. Flip the handle up and then pull out the dipstick and wipe the dipstick end with a clean rag

or paper towel.

3. Install the dipstick by pushing it back in the dipstick tube all the way, wait three seconds

and then pull it back out again.

4. Keep the dipstick pointing down and check both sides of the dipstick and read the lower

level. Repeat the check procedure to verify the reading.

5. Inspect the color of the fluid on the dipstick. Refer to Fluid Condition Inspection in this

procedure.

6. If the fluid level is below the COLD check line, add only enough fluid as necessary to bring

the level into the COLD line. It does not take much fluid, generally less than one pint
(0.5L). Do not overfill.

7. If the fluid level is in the acceptable range, push the dipstick back in all the way, then flip

the handle down to lock the dipstick in place.

8. Perform a hot check at the first opportunity after the transmission reaches a normal

operating temperature between 82-93°C (180-200°F).

Hot Check Procedure

operated safely until a hot check procedure can be made.
The hot check procedure is the most accurate method to
check the fluid level. Perform the hot check procedure at the
first opportunity.
Use this cold check procedure to check fluid level when the
TFT is between 27-32°C (80-90°F).

IMPORTANT: Always check the fluid level at least twice. Consistent

readings are important to maintaining proper fluid level. If
inconsistent readings are noted, inspect the transmission
vent assembly to ensure it is clean and unclogged.

IMPORTANT: Use this procedure to check the transmission fluid level

when the TFT is between 82-93°C (180-200°F). The ho t check
procedure is the most accurate method to check the fluid
level. The hot check should be performed at the first
opportunity in order to verify the cold check. The fluid level

2007 Hummer H3

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

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