Hummer H2. Manual — part 2490

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:

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

Did you detect a 4-3-3-4 shift pattern?

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 Diagnostic

Aids

3

1. Inspect the shift solenoid/hydraulic circuit

for the following conditions:

z

Debris or chips in the AFL oil
passage.

z

Debris or chips restricting oil flow
in passage #29 of the case or
through the spacer plate gasket into
the valve body.

z

A cracked 2-3 shift solenoid.

z

A 2-3 shift valve which is stuck or
hung up in the valve body bore.

z

A 2-3 shuttle valve which is stuck or
hung up in its bore.

z

Damaged seals on the shift solenoid
valves.

Refer to Shift Solenoid Leak Test .

2. Clean and inspect the related valves, bores

and the valve body for debris or
contamination.

-

-

2004 Hummer H2

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

DTC P0757

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 40% and accelerate to
64 km/h (40 mph).

4. Select Specific DTC.

5. Enter DTC P0756.

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. 18: 1-2 Shift Solenoid (SS) & 2-3 Shift Solenoid (SS) Valve Fluid Diagram
Courtesy of GENERAL MOTORS CORP.

Circuit Description

The 2-3 shift solenoid (SS) valve controls the fluid flow acting on the 2-3 shift valves. The 2-3 SS valve is a
normally-open exhaust valve that is used with the 1-2 SS valve in order to allow four different shifting
combinations.

When the PCM detects a 1-2-2-1 shift pattern, then DTC P0757 sets. DTC P0757 is a type A DTC.

Conditions for Running the DTC

z

No TP sensor DTCs P0122 or P0123.

z

No VSS assembly DTCs P0502 or P0503.

z

No TCC solenoid valve DTC P0740.

z

No TCC stuck ON DTC P0742.

z

No 1-2 SS valve DTC P0753.

z

No 2-3 SS valve DTC P0758.

z

No 3-2 SS valve assembly DTC P0785.

z

No TFP manual valve position switch DTC P1810.

z

No TCC PWM solenoid valve DTC P2761.

z

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

2004 Hummer H2

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

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 P0757 sets if both of the following conditions occur:

Condition 1

z

The PCM commands third gear for 1 second.

z

The estimated gear ratio is 1.6-1.8.

z

The engine torque is 36-368 N.m (50-500 lb ft).

z

All conditions are met for 2 seconds.

Condition 2

z

The PCM commands fourth gear for 1 second.

z

The estimated gear ratio is 1.8-3.3.

z

The engine torque is 0-295 N.m (50-400 lb ft).

z

All conditions are met for 2 seconds.

Action Taken When the DTC Sets

z

The PCM illuminates the malfunction indicator lamp (MIL).

z

The PCM commands third gear only.

z

The PCM commands maximum line pressure.

z

The PCM inhibits TCC engagement.

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 P0757 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.

z

A scan tool can clear the MIL/DTC.

2004 Hummer H2

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