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Hummer H2. Manual - part 2440

Did you find and correct the condition?

Go to Step 13

Go to Step 12

Inspect 3-4 clutch assembly for the following
conditions:

Worn clutch plates

Porosity in the 3-4 clutch piston

Damaged 3-4 clutch piston

Missing 3-4 clutch inner and outer seals

Cut 3-4 clutch inner and outer seals

Damaged 3-4 clutch inner and outer seals

Damaged 3-4 clutch spring assembly

Damaged 3-4 clutch apply ring

Damaged piston seal grooves

Plugged orifice cup plug

Missing orifice cup plug

Refer to 3-4 Clutch Assemble and extxref
document="029_Transmission-Transaxle-02"
filetype="sgml" extrefid="i7905">3-4 Clutch Plate
Travel Check in the 4L60-E section of the
Transmission Unit Repair Manual.
Did you find and correct the condition?

Go to Step 13

Go to Intermittent

Conditions in

Engine Controls -

6.0L (LQ4)

1. Change the AT fluid and filter.

2. Inspect for correct transmission fluid level.

Refer to Transmission Fluid Checking
Procedure .

3. Add new AT fluid as necessary.

4. Using the scan tool, perform the Clear TAPS

function.

Did you complete the above procedure?

IMPORTANT:

The Clear TAPS function will clear all adapt
cells. This may affect transmission
performance. The PCM will update the
transmission adapt cell values as the
vehicle is driven.

Go to Step 14

Perform the following procedure in order to verify

2004 Hummer H2

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

DTC P1810

the repair:

1. Select DTC.

2. Select Clear Info.

3. Operate the vehicle under the following

conditions:

Drive the vehicle in D4, with the TCC
ON, and a throttle position of 20-99%.

Ensure that the scan tool TCC Slip
Speed is -20 to +50 RPM for at least 7
seconds.

4. Select Specific DTC.

5. Enter DTC P0894.

Has the test run and passed?

Go to Step 15

Go to Step 2

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. 22: Automatic Transmission Fluid Pressure (TFP) Manual Valve Position Switch Diagram
Courtesy of GENERAL MOTORS CORP.

Circuit Description

The automatic transmission fluid pressure (TFP) manual valve position switch consists of five pressure
switches, two normally-closed and three normally-open, and a transmission fluid temperature (TFT) sensor
combined into one unit. The combined unit mounts on the valve body. The powertrain control module (PCM)
supplies ignition voltage for each range signal. By grounding one or more of these circuits through various
combinations of the pressure switches, the PCM detects which manual valve position you select. The PCM
compares the actual voltage combination of the switches to a TFP manual valve position switch combination
chart stored in memory.

The TFP manual valve position switch cannot distinguish between PARK and NEUTRAL because the
monitored valve body pressures are identical. With the engine OFF and the ignition switch in the ON position,
the TFP manual valve position switch indicates PARK/NEUTRAL. Disconnecting the AT inline 20-way
connector removes the ground potential for the three range signals to the PCM. In this case, with the engine
OFF, and the ignition switch in the ON position, D2 will be indicated.

When the PCM detects an invalid state of the TFP manual valve position switch circuit by deciphering the TFP
manual valve position switch inputs, then DTC P1810 sets. DTC P1810 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

No VSS assembly DTCs P0502 or P0503.

The system voltage is 10-18 volts.

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

The engine is not in fuel cutoff.

The engine torque is 54-542 N.m (40-400 lb ft).

The engine vacuum is 0-105 kPa (0-15 psi).

Conditions for Setting the DTC

DTC P1810 sets if any of the following conditions occurs:

Condition 1

The PCM detects an invalid TFP manual valve position switch state for 60 seconds.

Condition 2

The engine speed is less than 80 RPM for 0.1 second;

then the engine speed is 80-550 RPM for 0.07 second;

then the engine speed is greater than 550 RPM.

The vehicle speed is less than 3 km/h (2 mph).

The PCM detects a gear range of D2, D4 or REVERSE during an engine start.

All conditions met for 5 seconds.

Condition 3

The TP angle is 10-50 percent.

The PCM commands fourth gear.

The TCC is locked ON.

The speed ratio is 0.6-0.75.

The PCM detects a gear range of PARK or NEUTRAL when the vehicle is operating in D4.

All conditions met for 10 seconds.

Action Taken When the DTC Sets

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

The PCM commands D2 line pressure.

The PCM commands a D4 shift pattern.

The PCM freezes transmission adapt functions.

2004 Hummer H2

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

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