Hummer H2. Manual - part 2498

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.

The PCM stores DTC P1810 in PCM history during the second consecutive trip in which the Conditions
for Setting the DTC are met.

Conditions for Clearing the MIL/DTC

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

A scan tool can clear the MIL/DTC.

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

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

Refer to the Transmission Fluid Pressure (TFP) Manual Valve Position Switch Logic table for the
normal range signals and the invalid combinations. On the table, LOW is 0 volts, HI is ignition voltage.

Sediment in the valve body may cause improper operation of the TFP manual valve position switch. If
sediment intrusion is suspected, clean the valve body and replace the TFP manual valve position switch.

Test Description

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

3: This step compares the indicated range signal to the selected manual valve position.

5: This step tests for correct voltage from the PCM to the AT inline 20-way connector.

DTC P1810

Step

Action

Value

(s)

Yes

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)

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

1. Install a scan tool.

2. Turn ON the ignition, with the engine

OFF.

2004 Hummer H2

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

3. Record the DTC Freeze Frame and

Failure Records.

4. Clear the DTC.

5. Start the engine and idle at normal

operating temperature.

6. Apply the brake pedal.

7. Select each transmission range: P, R, N,

D4, D3, D2 and D1.

Does each selected transmission range match
the scan tool TFP Sw. display?

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 Intermittent

Conditions in

Engine Controls -

6.0L (LQ4)

Go to Step 4

1. Turn OFF the ignition.

2. Disconnect the AT inline 20-way

connector, additional DTCs may set.

3. Turn ON the ignition, with the engine

OFF.

Does the scan tool TFP Sw. A/B/C parameter
indicate HI for all range signal states?

Go to Step 5

Go to Step 9

1. Turn OFF the ignition.

2. Install the J 44152 Jumper Harness (20

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

3. Turn ON the ignition, with the engine

OFF.

4. Using the DMM and the J 35616 GM

Terminal Test Kit, measure the voltage
from terminal N of the J 44152 to
ground.

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

5. Measure the voltage from terminal R of

the J 44152 to ground.

10-12

2004 Hummer H2

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

6. Measure the voltage from terminal P of

the J 44152 to ground.

Does the voltage measure within the specified
range at all three terminals?

Go to Step 6

Go to Step 10

Connect a fused jumper wire from terminal N
of the J 44152 , signal circuit A, to ground
while monitoring the scan tool TFP Sw. A/B/C
parameter.
When signal circuit A is grounded, do any
other signal circuits indicate LOW?

Go to Step 11

Go to Step 7

Connect a fused jumper wire from terminal R
of the J 44152 , signal circuit B, to ground
while monitoring the scan tool TFP Sw. A/B/C
parameter.
When signal circuit B is grounded, do any
other signal circuits indicate LOW?

Go to Step 11

Go to Step 8

Connect a fused jumper wire from terminal P
of the J 44152 , signal circuit C, to ground
while monitoring the scan tool TFP Sw. A/B/C
parameter.
When signal circuit C is grounded, do any
other signal circuits indicate LOW?

Go to Step 11

Go to Step 12

Test the signal circuits of the TFP manual valve
position switch that did not indicate HI for a
short to ground between the PCM connector C1
and 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 16

Go to Step 15

Test the signal circuits of the TFP manual valve
position switch that did not indicate ignition
voltage for an open between the PCM
connector C1 and C2 and the AT inline 20-way
connector.
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?

Go to Step 16

Go to Step 15

Test the affected signal circuits of the TFP
manual valve position switch for a shorted
together condition between the PCM connector
C1 and C2 and the AT inline 20-way

2004 Hummer H2

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

connector.
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 16

Go to Step 15

Test the signal circuits of the TFP manual valve
position switch for an open or shorted
condition between the TFP manual valve
position switch and the AT inline 20-way
connector.
Refer to Circuit Testing and extxref
document="029_body-21" filetype="sgml"
extrefid="i162420"> Wiring Repairs in Wiring
Systems.
Did you find a condition?

Go to Step 13

Go to Step 14

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

Go to Step 16

Replace the TFP manual valve position switch.
Refer to Valve Body and Pressure Switch
Replacement .
Did you complete the replacement?

Go to Step 16

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

Go to Step 16

Perform the following procedure in order to
verify the repair:

1. Select DTC.

2. Select Clear Info.

3. Operate the vehicle under the following

conditions:

1. Turn ON the ignition, with the

engine OFF for at least 2 seconds.

2. Start the vehicle and idle for 5

seconds.

3. Drive in D4 until the TCC locks

for 10 seconds.

4. Continue to run the engine for at

least 60 seconds from startup.

4. Select Specific DTC.

2004 Hummer H2

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

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