Hummer H2. Manual — part 2475

Step

Action

(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.

3. Record the DTC Failure Records.

4. Clear the DTC.

5. Select Trans. Fluid Temp. on the scan tool.

6. Drive the vehicle and observe the scan tool

for either of the following conditions:

z

The Trans. Fluid Temp. does not
change more than 2.25°C (4°F) in
409 seconds since startup.

z

The Trans. Fluid Temp. changes
more than 20°C (36°F) in 200
milliseconds 14 times within 7
seconds.

Did either of the conditions occur?

IMPORTANT:

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

-

Go to Step 4

Go to Intermittent

Conditions in

Engine Controls -

6.0L (LQ4)

4

Did the scan tool display a condition in which the
Trans. Fluid Temp. does not change by more than
the specified value in 409 seconds since startup?

2.25°
C (4°

F)

Go to Step 6

Go to Step 5

1. Turn OFF the ignition.

2. Disconnect the AT inline 20-way

connector, additional DTCs may set.

3. Install the J 44152 Jumper Harness (20

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

2004 Hummer H2

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

5

4. Using the J 35616 GM Terminal Test Kit,

connect a test lamp from terminal L to
terminal M of the J 44152 .

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

5. Turn ON the ignition, with the engine OFF.

6. While observing the scan tool display,

move or wiggle the engine wiring harness
from PCM connectors C1 and C2 to the AT
inline 20-way connector.

Does the scan tool Trans. Fluid Temp. change by
more than the specified value?

20°C

(36°F)

Go to Step 7

Go to Step 8

6

1. Turn OFF the ignition.

2. Disconnect the AT inline 20-way

connector.

3. Turn ON the ignition, with the engine OFF.

Does the scan tool display the same condition as
in Step 4?

-

Go to Step 11

Go to Step 10

7

1. Test the signal circuit of the TFT sensor for

an intermittent open or short condition
between the PCM connector C2 and the AT
inline 20-way connector.

2. Test the low reference circuit of the TFT

sensor for an intermittent open or short
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 12

Go to Step 11

8

1. Test the signal circuit of the TFT sensor for

an intermittent open or short condition
between the AT inline 20-way connector
and the TFT sensor.

2. Test the low reference circuit of the TFT

sensor for an intermittent open or short
condition.

-

2004 Hummer H2

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

DTC P0712

Refer to Circuit Testing and extxref
document="029_body-21" filetype="sgml"
extrefid="i162420"> Wiring Repairs in Wiring
Systems.Did you find an intermittent open or
short condition?

Go to Step 9

Go to Step 10

9

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

-

Go to Step 12

-

10

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 12

-

11

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

-

Go to Step 12

-

12

Perform the following procedure in order to verify
the repair:

1. Select DTC.

2. Select Clear Info.

3. Drive the vehicle and ensure that the

following conditions are met:

z

The Trans. Fluid Temp. changes by
more than 2.25°C (4°F) for 11
seconds since startup

z

The Trans. Fluid Temp. does not
change by more than 20°C (36°F)
within 200 milliseconds for a period
of at least 11 seconds

4. Select Specific DTC.

5. Enter DTC P0711.

Has the test run and passed?

-

Go to Step 13

Go to Step 2

13

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

Fig. 6: Automatic Transmission Fluid Temperature (TFT) Sensor
Courtesy of GENERAL MOTORS CORP.

Circuit Description

The automatic transmission fluid temperature (TFT) sensor is part of the automatic transmission fluid pressure
(TFP) manual valve position switch. The TFT sensor is a resistor, or thermistor, which changes value based on
temperature. The sensor has a negative-temperature coefficient. This means that as the temperature increases,
the resistance decreases, and as the temperature decreases, the resistance increases. The powertrain control
module (PCM) supplies a 5-volt reference signal to the sensor on the TFT sensor signal circuit and measures the
voltage drop in the circuit. When the transmission fluid is cold, the sensor resistance is high and the PCM

2004 Hummer H2

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