Hummer H2. Manual — part 2419

detects high signal voltage. As the fluid temperature warms to a normal operating temperature, the resistance
becomes less and the signal voltage decreases. The PCM uses this information to control shift quality and
torque converter clutch apply.

When the PCM detects a continuous short to ground in the TFT signal circuit or in the TFT sensor, then DTC
P0712 sets. DTC P0712 is a type C DTC.

Conditions for Running the DTC

The ignition is ON.

Conditions for Setting the DTC

The TFT sensor indicates a signal voltage less than 0.25 volts for 10 seconds.

Action Taken When the DTC Sets

z

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

z

The PCM determines a default TFT using one of the following:

1. If any ECT DTCs P0117 or P0118 are set, then the default TFT is equal to 135°C (275°F).

2. If the ECT is 125°C (257°F) or more, then the default TFT is equal to 135°C (275°F).

3. If the engine run time is less than 300 seconds and:

z

No intake air temperature (IAT) DTCs P0112 or P0113 are set and IAT is available, then the
default TFT is equal to IAT.

z

Any IAT DTCs P0112 or P0113 are set or IAT is NOT available, then the default TFT is
equal to 90°C (194°F).

4. If the engine run time is greater than 300 seconds and no IAT DTCs P0112 or P0113 are set and

IAT is available and ECT is between 40 and 125°C (104 and 257°F) and:

z

IAT at startup is less than 15°C (59°F), then the default TFT is equal to the ECT plus 5°C (8°
F).

z

IAT at startup is greater than 35°C (95°F), then the default TFT is equal to the ECT plus 10°
C (16°F).

z

IAT at startup is between 15 and 35°C (59 and 95°F), then the default TFT is equal to the
ECT.

5. If the engine run time is greater than 300 seconds and any IAT DTCs P0112 or P0113 are set or

IAT is NOT available, then the default TFT is equal to the ECT.

6. If the engine run time is greater than 300 seconds and ECT is less than 40°C (104°F) or more, then

the default TFT is equal to 60°C (140°F).

z

The PCM freezes shift adapts from being updated.

z

The PCM records the operating conditions when the Conditions for Setting the DTC are met. The PCM

IMPORTANT: The actions listed below are in order of highest to lowest priority.

2004 Hummer H2

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

stores this information as Failure Records.

z

The PCM stores DTC P0712 in PCM history.

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/or the ignition switch is
OFF long enough in order to power down the PCM.

Diagnostic Aids

z

The scan tool displays the transmission fluid temperature in degrees. After the transmission is operating,
the fluid temperature should rise steadily to a normal operating temperature, then stabilize.

z

Verify the customer's driving habits, trailer towing, etc. Trailer towing should occur in D3.

Test Description

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

3: This step tests for a short to ground condition.

4: This step tests for an internal fault within the transmission by creating an open.

DTC P0712

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

Inspect for correct transmission fluid level.
Refer to Transmission Fluid Checking
Procedure .
Did you perform the fluid checking
procedure?

-

Go to Step 3

Go to Transmission

Fluid Checking

Procedure

3

1. Install a scan tool.

2. Turn ON the ignition, with the engine

OFF.

IMPORTANT:

Before clearing the DTC, use the
scan tool in order to record the
Failure Records. Using the Clear
Info function erases the Failure

0.2 V

2004 Hummer H2

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

3. Record the DTC Failure Records.

4. Clear the DTC.

Does the scan tool displays a TFT Sensor
signal voltage greater than the specified
value?

Records from the PCM.

Go to Intermittent

Conditions in

Engine Controls -

6.0L (LQ4)

Go to Step 4

4

1. Turn OFF the ignition.

2. Disconnect the AT inline 20-way

connector, additional DTCs may set.

3. Turn ON the ignition, with the engine

OFF.

Does the scan tool displays a TFT Sensor
signal voltage greater than the specified
value?

4.92 V

Go to Step 5

Go to Step 7

5

1. Install the J 44152 Jumper Harness

(20 pins) on the transmission side of
the AT inline 20-way connector.

2. Using the DMM and the J 35616 GM

Terminal Test Kit, measure the
resistance between terminals L and M
of the J 44152 .

Refer to Automatic Transmission
Inline 20-Way Connector End
View .

Does the resistance measure within the
specified range?

3088-

3942

ohm at

20°C

(68°F)

159-198

ohm at

100°C

(212°F)

Go to Intermittent

Conditions in

Engine Controls -

6.0L (LQ4)

Go to Step 6

6

Test the signal circuit of the TFT sensor for
a short to ground between the AT inline 20-
way connector and the TFT sensor.
Refer to Testing for Short to Ground in
Wiring Systems.
Did you find a short to ground condition?

-

Go to Step 9

Go to Step 8

7

Test the signal circuit of the TFT sensor for
a short to ground between the PCM
connector C2 and the AT inline 20-way
connector.
Refer to Testing for Short to Ground and
extxref document="029_body-21"
filetype="sgml"

-

2004 Hummer H2

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

DTC P0713

extrefid="i162420">Wiring Repairs in
Wiring Systems.
Did you find and correct the condition?

Go to Step 11

Go to Step 10

8

Replace the TFT sensor, this sensor is part
of the TFP manual valve position switch.
Refer to Valve Body and Pressure Switch
Replacement .
Did you complete the replacement?

-

Go to Step 11

-

9

Replace the AT wiring harness assembly.
Refer to Valve Body and Pressure Switch
Replacement .
Did you complete the replacement?

-

Go to Step 11

-

10

Replace the PCM.
Refer to Powertrain Control Module
(PCM) Replacement in Engine Controls -
6.0L (LQ4).
Did you complete the replacement?

-

Go to Step 11

-

11

Perform the following procedure in order to
verify the repair:

1. Select DTC.

2. Select Clear Info.

3. Turn ON the ignition, with the engine

OFF.

4. Verify that the scan tool indicates a

TFT Sensor signal voltage greater
than 0.2 volts for 10 seconds.

5. Select Specific DTC.

6. Enter DTC P0712.

Has the test run and passed?

-

Go to Step 12

Go to Step 2

12

With the scan tool, observe the stored
information, capture info, and DTC Info.
Does the scan tool display any DTCs that
you have not diagnosed?

-

Go to Diagnostic

Trouble Code

(DTC) List in

Engine Controls -

6.0L (LQ4)

System OK

2004 Hummer H2

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