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Hummer H2. Manual - part 2428

Inline 20-Way Connector End View .

Does the resistance measure within the
specified range?

Go to Step 5

Go to Step 4

Does the resistance measure greater than the
specified value?

7 ohm

Go to Step 9

Go to Step 10

Measure the resistance from terminal C of the J
44152 to the transmission case.
Refer to Automatic Transmission Inline 20-
Way Connector End View .
Does the resistance measure greater than the
specified value?

250 K

ohm

Go to Step 6

Go to Step 11

1. Disconnect the J 44152 from the

transmission side of the AT inline 20-
way connector.

2. Reconnect the transmission AT inline 20-

way connector.

3. Disconnect the PCM connector C2.

4. Measure the resistance between PCM

connector terminal C2-6 and terminal
C2-8.

Does the resistance measure within the
specified range?

3-7

ohm

Go to Step 8

Go to Step 7

Does the resistance measure greater than the
specified value?

7 ohm

Go to Step 12

Go to Step 13

Using the DMM and the J 35616 , measure the
resistance from PCM connector terminal C2-6
to ground.
Does the resistance measure greater than the
specified value?

250 K

ohm

Go to Step 17

Go to Step 14

Test the high control circuit and the low control
circuit of the PC solenoid valve for an open
between the AT inline 20-way connector and
the PC solenoid valve.
Refer to Testing for Continuity in Wiring
Systems.
Did you find an open condition?

Go to Step 16

Go to Step 15

Test the high control circuit and the low control
circuit of the PC solenoid valve for a shorted
together condition between the AT inline 20-
way connector and the PC solenoid valve.
Refer to Circuit Testing in Wiring Systems.
Did you find a shorted together condition?

Go to Step 16

Go to Step 15

Test the high control circuit and the low control

2004 Hummer H2

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

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

Go to Step 16

Go to Step 15

Test the high control circuit and the low control
circuit of the PC solenoid valve for an open
between the PCM connector 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 19

Test the high control circuit and the low control
circuit of the PC solenoid valve for a shorted
together condition between the PCM connector
C2 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 and correct the condition?

Go to Step 19

Test the high control circuit and the low control
circuit of the PC 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 19

Replace the PC solenoid valve.
Refer to Valve Body and Pressure Switch
Replacement .
Did you complete the replacement?

Go to Step 19

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

Go to Step 19

Test the high control circuit and the low control
circuit of the PC solenoid for a short to voltage.
Refer to Testing for a Short to Voltage and
extxref document="029_body-21"
filetype="sgml" extrefid="i162420">Wiring

2004 Hummer H2

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

DTC P0751

Repairs in Wiring Systems.
Did you find and correct the condition?

Go to Step 19

Go to Step 18

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

Go to Step 19

Perform the following procedure in order to
verify the repair:

1. Select DTC.

2. Select Clear Info.

3. Start the engine and ensure that the

following condition is met:

The difference between the scan tool PC
Sol. Actual Current and the PC Sol. Ref.
Current is less than 0.16 amp.

4. Select Specific DTC.

5. Enter DTC P0748.

Has the test run and passed?

Go to Step 20

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. 14: 1-2 Shift Solenoid (SS) & 2-3 Shift Solenoid (SS) Valve Fluid 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 1-2 SS valve
is a normally-open exhaust valve that is used with the 2-3 SS valve, in order to allow four different shifting
combinations

When the PCM detects a 2-2-3-3 shift pattern, then DTC P0751 sets. DTC P0751 is a type B DTC.

Conditions for Running the DTC

No TP sensor DTCs P0122 or P0123.

No VSS assembly DTCs P0502 or P0503.

No TCC solenoid valve DTC P0740.

No TCC stuck ON DTC P0742.

No 1-2 SS valve DTC P0753.

No 2-3 SS valve DTC P0758.

No 3-2 SS valve assembly DTC P0785.

No TFP manual valve position switch DTC P1810.

No TCC PWM solenoid valve DTC P2761.

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

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