Hummer H2. Manual — part 1659

1

Did you perform the Diagnostic System Check-Engine
Controls?

Go to Step 2

Go to Diagnostic

System Check -

Engine Controls

2

1. Turn the nitrogen/smoke valve to nitrogen.

2. Connect the nitrogen/smoke hose to the 0.5 mm (0.20

in) test orifice on the bottom-front of the J 41413-200
Evaporative Emissions System Tester (EEST).

3. Activate the J 41413-200 with the remote switch.

4. Align the red flag on the flow meter with the floating

indicator. De-activate the J 41413-200 with the remote
switch.

5. Install the J 41415-40 Fuel Tank Cap Adapter or GE-

41415-50 Fuel Tank Cap Adapter to the fuel fill pipe.

6. Remove the nitrogen/smoke hose from the test orifice

and install the hose onto the J 41415-40 or GE-41415-
50 .

7. Turn ON the ignition, with the engine OFF.

8. Command the evaporative emissions (EVAP) canister

vent solenoid valve closed with a scan tool.

9. Introduce nitrogen and fill the EVAP system until the

floating stabilizes with the remote switch.

10. Compare the flow meter's stable floating indicator

position to the red flag.

Is the floating indicator below the red flag?

IMPORTANT:

Larger volume fuel tanks and/or those with lower fuel
levels may require several minutes for the floating
indicator to stabilize.

Go to Diagnostic

Aids

Go to Step 3

1. Turn OFF the ignition.

2. Connect the J 41413-200 power supply clips to a

known good 12-volt source.

3. Install the J 41415-40 orGE-41415-50 to the fuel fill

pipe.

4. Connect the J 41413-200 nitrogen/smoke supply hose

to the J 41415-40 or GE-41415-50 .

IMPORTANT:

Ensure that the vehicle underbody temperature is similar
to the ambient temperature and allow the surrounding air
to stabilize before starting the diagnostic procedure.
System flow will be less with higher temperatures.

2004 Hummer H2

2004 ENGINE PERFORMANCE Engine Controls Diagnosis (DTC P0171/P0174 To DTC P0507 (TAC)) - 4.8L, 5.3L, and

6.0L - Hummer H2

3

5. Turn ON the ignition, with the engine OFF.

6. Command the EVAP canister vent solenoid valve

closed with a scan tool.

7. Turn the nitrogen/smoke valve on the J 41413-200

control panel to SMOKE.

8. Use the remote switch to introduce smoke into the

EVAP system.

9. Use the J 41413-VLV EVAP Service Port Vent

Fitting to open the EVAP service port.

10. Remove the J 41413-VLV once smoke is observed.

11. Continue to introduce smoke into the EVAP system

for an additional 60 seconds.

12. Inspect the entire EVAP system for exiting smoke

with the J 41413-SPT High Intensity White Light.

13. Continue to introduce smoke at 15 second intervals

until the leak source has been located.

Did you locate and repair a leak source?

Go to Step 5

Go to Step 4

4

1. Disconnect the J 41415-40 or GE-41415-50 from the

fuel fill pipe.

2. Install the fuel fill cap to the fuel fill pipe.

3. Connect the J 41413-200 nitrogen/smoke supply hose

to the EVAP service port.

4. Use the remote switch to introduce smoke into the

EVAP system.

5. Inspect the entire EVAP system for exiting smoke

with the J 41413-SPT .

6. Continue to introduce smoke at 15 second intervals

until the leak source has been located.

Did you locate and repair a leak source?

Go to Step 5

Go to Diagnostic

Aids

1. Turn the nitrogen/smoke valve to nitrogen.

2. Connect the nitrogen/smoke hose to the 0.50 mm (0.20

in) test orifice on the bottom-front of the J 41413-
200 .

3. Use the remote switch to activate the J 41413-200 .

4. Align the red flag on the flow meter with the floating

IMPORTANT:

Larger volume fuel tanks and/or those with lower fuel
levels may require several minutes for the floating
indicator to stabilize.

2004 Hummer H2

2004 ENGINE PERFORMANCE Engine Controls Diagnosis (DTC P0171/P0174 To DTC P0507 (TAC)) - 4.8L, 5.3L, and

6.0L - Hummer H2

DTC P0443

Circuit Description

An ignition voltage is supplied directly to the evaporative emission (EVAP) canister purge solenoid valve. The
EVAP canister purge solenoid valve is pulse width modulated (PWM). The scan tool displays the amount of
ON time as a percentage. The control module monitors the status of the driver. The control module controls the
EVAP canister purge solenoid valve ON time by grounding the control circuit via an internal switch called a
driver. If the control module detects an incorrect voltage for the commanded state of the driver, this DTC sets.

Conditions for Running the DTC

z

The engine speed is more than 400 RPM.

z

The system voltage is between 6-18 volts.

Conditions for Setting the DTC

z

The control module detects that the commanded state of the driver and the actual state of the control
circuit do not match.

z

The above conditions are present for a minimum of 5 seconds.

Action Taken When the DTC Sets

z

The control module illuminates the malfunction indicator lamp (MIL) on the second consecutive ignition
cycle that the diagnostic runs and fails.

5

indicator. Use the remote switch to de-activate the J
41413-200 .

5. Install the J 41415-40 or GE-41415-50 to the fuel fill

pipe.

6. Remove the nitrogen/smoke hose from the test orifice

and install the hose onto the J 41415-40 or GE-41415-
50 .

7. Turn ON the ignition, with the engine OFF.

8. Command the EVAP canister vent solenoid valve

closed with a scan tool.

9. Use the remote switch to introduce nitrogen and fill

the EVAP system until the floating stabilizes.

10. Compare the flow meter's stable floating indicator

position to the red flag.

Is the floating indicator below the red flag?

Go to Step 6

Go to Step 2

6

Observe the Capture Info with a scan tool.
Are there any DTCs that have not been diagnosed?

Go to Diagnostic

Trouble Code

(DTC) List

System OK

2004 Hummer H2

2004 ENGINE PERFORMANCE Engine Controls Diagnosis (DTC P0171/P0174 To DTC P0507 (TAC)) - 4.8L, 5.3L, and

6.0L - Hummer H2

z

The control module records the operating conditions at the time the diagnostic fails. The first time the
diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic
reports a failure on the second consecutive ignition cycle, the control module records the operating
conditions at the time of the failure. The control module writes the operating conditions to the Freeze
Frame and updates the Failure Records.

Conditions for Clearing the MIL/DTC

z

The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles
that the diagnostic runs and does not fail.

z

A current DTC, Last Test Failed, clears when the diagnostic runs and passes.

z

A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other
emission related diagnostic.

z

Clear the MIL and the DTC with a scan tool.

Test Description

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

2: This step tests if the concern is active. The EVAP canister purge solenoid valve is PWM. You should
hear a clicking sound when the EVAP canister purge solenoid valve is commanded to 50 percent. The
clicking sound should stop when the EVAP canister purge solenoid valve is commanded to 0 percent. The
rate at which the valve cycles should increase when the commanded state is increased, and decrease when
the commanded state is decreased.

5: This step verifies that the control module is providing ground to the EVAP canister purge solenoid
valve.

6: This step tests if a ground is constantly being applied to the EVAP canister purge solenoid valve.

DTC P0443

Step

Action

Yes

No

Schematic Reference:Engine Controls Schematics
Connector End View Reference:Engine Controls Connector End Views or Powertrain Control
Module (PCM) Connector End Views

1

Did you perform the Diagnostic System Check - Engine
Controls?

Go to Step 2

Go to Diagnostic

System Check -

Engine Controls

2

1. Turn ON the ignition, with the engine OFF.

2. Command the evaporative emission (EVAP)

canister purge solenoid valve to 50 percent, then to 0
percent with a scan tool.

Does the EVAP canister purge solenoid valve respond to
the commanded state?

Go to Step 3

Go to Step 4

1. Observe the Freeze Frame/Failure Records for this

2004 Hummer H2

2004 ENGINE PERFORMANCE Engine Controls Diagnosis (DTC P0171/P0174 To DTC P0507 (TAC)) - 4.8L, 5.3L, and

6.0L - Hummer H2