Hummer H2. Manual — part 2430

z

The engine is not in fuel cutoff.

z

The gear range is D4.

z

The TP angle is greater than 10 percent.

z

The transmission fluid temperature is 20-130°C (68-266°F).

z

The transmission output speed is 150 RPM or greater.

z

The transfer case ratio in 4WD low is 0.9-1.2.

z

The transfer case ratio in 4WD high is 2.6-2.85.

Conditions for Setting the DTC

DTC P0752 sets if both of the following conditions occur twice:

Condition 1

z

The PCM commands second gear for 1 second.

z

The estimated gear ratio is 3.0-3.3.

z

The engine torque is 34-542 N.m (25-400 lb ft).

z

All conditions are met for 2 seconds.

Condition 2

z

The PCM commands third gear for 1 second.

z

The estimated gear ratio is 0.65-0.9.

z

The engine torque is 67-542 N.m (50-400 lb ft).

z

All conditions are met for 3 seconds.

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 4th gear in Hot Mode.

z

The PCM commands D2 line pressure.

z

The PCM inhibits 3-2 downshifts if the vehicle speed is greater than 48 km/h (30 mph) or greater.

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 P0752 in PCM history.

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.

2004 Hummer H2

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

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 fault no longer exists and/or the ignition switch is
OFF long enough in order to power down the PCM.

Diagnostic Aids

z

Verify that the transmission meets the specifications in the Shift Speed table.

z

Other internal transmission failures may cause more than one shift to occur.

z

Refer to the Shift Solenoid Valve State and Gear Ratio table.

Test Description

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

2: This step tests that the PCM commanded all shifts, that all shift solenoid valves responded correctly,
but that all the shifts did not occur.

DTC P0752

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.

5. Drive the vehicle in D4 range under the

following conditions:

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.

-

2004 Hummer H2

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

DTC P0753

Accelerate the vehicle, ensuring that the
PCM commands 1st, 2nd, 3rd and 4th
gears.

Did you detect a 1-1-4-4 shift pattern?

Go to Step 3

Go to Intermittent

Conditions in Engine

Controls - 6.0L (LQ4)

3

Inspect the shift solenoid/hydraulic circuit for
the following conditions:

z

An internal malfunction.

z

Damaged seals on the shift solenoid
valve.

Refer to Shift Solenoid Leak Test .

Did you find and correct the condition?

-

Go to Step 4

-

4

Perform the following procedure in order to
verify the repair:

1. Select DTC.

2. Select Clear Info.

3. Drive the vehicle in D4 range under the

following condition, only if traffic and
road conditions permit:

Hold the throttle at 20% and accelerate
to 88 km/h (55 mph).

4. Select Specific DTC.

5. Enter DTC P0752.

Has the test run and passed?

-

Go to Step 5

Go to Step 2

5

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. 16: 1-2 Shift Solenoid (SS) Valve Diagram
Courtesy of GENERAL MOTORS CORP.

Circuit Description

The 1-2 shift solenoid (SS) valve controls the fluid flow acting on the 1-2 and 3-4 shift valves. The solenoid is a
normally-open exhaust valve. With the 2-3 SS valve, the 1-2 SS valve allows four different shifting
combinations. The solenoid attaches to the control valve body within the transmission. The 1-2 SS valve
receives ignition voltage through the Ignition 0 voltage circuit. The powertrain control module (PCM) controls
the solenoid by providing the ground path on the 1-2 SS valve control circuit.

When the PCM detects a continuous open, short to ground or short to power in the 1-2 SS valve circuit, then
DTC P0753 sets. DTC P0753 is a type B DTC.

Conditions for Running the DTC

2004 Hummer H2

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