Hummer H2. Manual — part 2481

z

The engine speed is greater than 450 RPM for 5 seconds.

z

The engine is not in fuel cutoff.

Conditions for Setting the DTC

DTC P0740 sets if one of the following conditions occurs for 5 seconds:

Condition 1

The PCM commands the solenoid ON and the voltage feedback remains high, B+.

Condition 2

The PCM commands the solenoid OFF and the voltage feedback remains low, 0 volt.

Action Taken When the DTC Sets

z

The PCM illuminates the malfunction indicator lamp (MIL) during the second consecutive trip in which
the Conditions for Setting the DTC are met.

z

The PCM inhibits TCC engagement.

z

The PCM inhibits 4th gear if the transmission is in hot mode.

z

The PCM freezes transmission adapt functions.

z

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

z

The PCM stores DTC P0740 in PCM history during the second consecutive trip in which the Conditions
for Setting the DTC are met.

Conditions for Clearing the MIL/DTC

z

The PCM turns OFF the MIL during the third consecutive trip in which the diagnostic test runs and
passes.

z

A scan tool can clear the MIL/DTC.

z

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

z

The PCM cancels the DTC default actions when the ignition switch is OFF long enough in order to power
down the PCM.

Diagnostic Aids

With the TCC engaged, the TCC slip speed should be -20 to +50 RPM.

Test Description

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

2004 Hummer H2

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

4: This step tests for voltage to the solenoid.

5: This step tests the ability of the PCM and wiring to control the ground circuit.

7: This step tests the resistance of the TCC solenoid valve and the automatic transmission (AT) wiring
harness assembly.

DTC P0740

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. Record the DTC Freeze Frame and Failure

Records.

4. Clear the DTC.

Are any of the following DTCs also set?

z

P0753

z

P0758

z

P0785

z

P2761

IMPORTANT:

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

-

Go to Step 3

Go to Step 4

3

Inspect the IGN 0 fuse for an open.
Refer to Circuit Protection - Fuses in Wiring
Systems.
Is the fuse open?

-

Go to Step 9

Go to Step 4

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

2004 Hummer H2

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

4

connector.

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

5. Using the J 35616 GM Terminal Test Kit,

connect a test lamp from terminal E of the J
44152 to ground.

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

Does the test lamp illuminate?

-

Go to Step 5

Go to Step 12

5

1. Connect the test lamp from terminal E to

terminal T of the J 44152 .

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

2. Use the scan tool in order to command the TCC

solenoid valve ON and OFF three times.

Does the test lamp turn ON and OFF with each
command?

-

Go to Step 7

Go to Step 6

6

Is the test lamp always ON?

-

Go to Step 13

Go to Step 14

7

1. Install the J 44152 on the transmission side of

the AT inline 20-way connector.

2. Using the DMM and the J 35616 , measure the

resistance between terminals T and E of the J
44152 .

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

Does the resistance measure within the specified
range?

21-33

ohm

Go to Step 8

Go to Step 15

8

1. Measure the resistance from terminal E of the J

44152 to ground.

2. Measure the resistance from terminal T of the J

44152 to ground.

Do both readings measure greater than the specified
value?

250 K

ohm

Go to

Intermittent

Conditions in

Engine Controls -

6.0L (LQ4)

Go to Step 15

IMPORTANT:

The condition that affects this circuit may exist in
other connecting branches of the circuit. Refer to
Power Distribution Schematics in Wiring Systems

2004 Hummer H2

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

9

Test the Ignition 0 voltage circuit of the TCC solenoid
valve for a short to ground between the fuse block
and the AT inline 20-way connector.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?

for complete circuit distribution.

-

Go to Step 17

Go to Step 10

10

Test the Ignition 1 voltage circuit of the TCC solenoid
valve for a short to ground between the AT inline 20-
way connector and the TCC solenoid valve.Refer to
Testing for Short to Ground in Wiring Systems.Did
you find a short to ground condition?

IMPORTANT:

The condition that affects this circuit may exist in
other connecting branches of the circuit. Refer to
Power Distribution Schematics in Wiring Systems
for complete circuit distribution.

-

Go to Step 15

Go to Step 11

11

1. Test each solenoid for a short to ground.

2. Replace the faulty solenoid as necessary.

Did you complete the replacement?

-

Go to Step 17

-

12

Test the Ignition 0 voltage circuit of the TCC solenoid
valve 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?

IMPORTANT:

The condition that affects this circuit may exist in
other connecting branches of the circuit. Refer to
Power Distribution Schematics in Wiring Systems
for complete circuit distribution.

-

Go to Step 17

-

13

Test the control circuit of the TCC solenoid valve 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"
extrefid="i162420">Wiring Repairs in Wiring
Systems.
Did you find and correct the condition?

-

Go to Step 17

Go to Step 16

Test the control circuit of the TCC solenoid valve for

2004 Hummer H2

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