Hummer H2. Manual - part 1559

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