
TEST ACTION APPLICABILITY
3Note: Leaving the Gas Cap loose could cause this trouble code to set.
To continue testing you will need Miller Tool Kit #6872A and #8382.
NOTE: The Fuel Tank must have 1/2 tank of fuel to perform this test.
Perform Evaporative System Pressure Pump Self Test that is specified on the tester
cover.
Warning: Verify the vehicle fuel tank contains at least 3 gallons of fuel.
Attach the DRB III to the vehicle.
Turn the Key On.
At: ENGINE SYSTEM TESTS select: LEAK DETECTION PUMP TEST.
Read instructions and then press ENTER.
At: LEAK DETECTION PUMP TEST select #3 HOLD PSI.
At the vacuum hose going to the LDP, attach and apply a continuous vacuum (i.e. 209
Hg).
Remove Gas Cap.
Install 8382 on the Gas Cap and on the vehicle.
Attach the supply hose from 6872A to 8382.
Attach the power source from the 6872A, clip to Battery(+) and ground clip to
Battery(-).
On the 6872A set the Pressure/Hold Valve to Open and set the Vent Valve to Closed.
Turn the timer on and watch the gauge.
When the gauge pressure reaches 14 in. H2O, turn the Pressure/Hold Valve to
Closed.
Turn the timer off. Note the time and pressure.
Did pressure drop more than 6 in. H2O (to 8 inches H2O on the gauge) in two
minutes?All
Ye s®Go To 4
No®Go To 5
141
DRIVEABILITY
P-0442 EVAP LEAK MONITOR SMALL LEAK DETECTED ÐContinued
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TEST ACTION APPLICABILITY
4 To continue testing you will need Miller Tool Kit #6872A, #8382 and #6904 Ultrasonic
Leak Detector.
NOTE: The Fuel Tank must have 1/2 tank of fuel to perform this test.
Perform Evaporative System Pressure Pump Self Test that is specified on the tester
cover.
Warning: Verify the vehicle fuel tank contains at least 3 gallons of fuel.
Attach the DRB III to the vehicle.
Turn the Key On.
At: ENGINE SYSTEM TESTS select: LEAK DETECTION PUMP TEST.
Read instructions and then press ENTER.
At: LEAK DETECTION PUMP TEST select #3 HOLD PSI.
At the vacuum hose going to the LDP, attach and apply a continuous vacuum (i.e. 209
Hg).
Remove Gas Cap.
Install 8382 on the Gas Cap and on the vehicle.
Attach the supply hose from 6872A to 8382.
Attach the power source from the 6872A, clip to Battery(+) and ground clip to
Battery(-).
Set Pressure Hold to Open and set Vent to Open.
Turn Pump Timer On.
To prevent noise from interfering with test, move tool #6872 away from vehicle.
Using the Ultrasonic Leak Detector, start listening for leaks at Gas Cap then proceed
to Rollover Valve, Canister, Leak Detection Pump, and Evap Purge Solenoid.
Were any leaks heard with the Ultrasonic Leak Detector?All
Ye s®Repair or replace leaking component.
Perform VERIFICATION TEST VER-6A.
No®Replace Leak Detection Pump.
Perform VERIFICATION TEST VER-6A.
5 At this time, the condition required to set the code is not present.
Using the schematic as a guide, inspect the wiring, connectors and hoses.
Were any problems found?All
Ye s®Repair as necessary.
Perform VERIFICATION TEST VER-6A.
No®Test Complete.
142
DRIVEABILITY
P-0442 EVAP LEAK MONITOR SMALL LEAK DETECTED ÐContinued
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TEST ACTION APPLICABILITY
6 To perform this test you will need Miller Tool Kit #6872A and #6922.
Caution: Refer to safety information.
If disconnected, reconnect the Vacuum Connector at the Purge Solenoid.
Perform Evaporative System Pressure Pump Self Test that is specified on the tester
cover.
Connect the Evap Pressure Pump Supply to Gas Cap Adapter and install on vehicle.
Start Engine.
With the DRB, go to LDP SYSTEM TEST and follow instructions on the screen.
Using Pressure Tool #6872A, set Pressure Hold to Open, and set Vent to Closed.
Turn Pump Timer On.
Allow Pressure Pump to build pressure up to at least 149H2O.
Remove hose at Evap Canister that goes to Purge Solenoid.
Did pressure drop when hose was disconnected?All
Ye s®Repair the pinched hose from the Purge Solenoid to the Evap
Canister.
Perform VERIFICATION TEST VER-6A.
No®Go To 7
7 To perform this test you will need Miller Tool Kit #6872A and #6922.
Caution: Refer to safety information.
Perform Evaporative System Pressure Pump Self Test that is specified on the tester
cover.
Connect the Evap Pressure Pump Supply to Gas Cap Adapter and install on vehicle.
Start Engine.
With the DRB, go to LDP SYSTEM TEST and follow instructions on the screen.
Using Pressure Tool #6872A, set Pressure Hold to Open, and set Vent to Closed.
Turn Pump Timer On.
Allow Pressure Pump to build pressure up to at least 149H2O.
Remove hose at Evap Canister that goes to Fuel Tank.
Did pressure drop when hose was disconnected?All
Ye s®Replace the Evaporative Canister.
Perform VERIFICATION TEST VER-6A.
No®Repair the pinched hose from the Gas Tank to the Evap Canister.
Perform VERIFICATION TEST VER-6A.
202
DRIVEABILITY
P-1486 EVAP LEAK MONITOR PINCHED HOSE FOUND ÐContinued
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TEST ACTION APPLICABILITY
4 Ignition Off
Warning: The Fuel System must be opened and may be under high pressure.
Release the fuel pressure.
Remove the Fuel Pressure Gauge from the Fuel Rail.
Adjust a shop air hose to 40 psi.
Remove the Fuel Filter.
Using shop air, inspect the Fuel Filter passage by attempting to blow air through
inlet.
Is the Fuel Filter restricted?All
Ye s®Replace the Fuel Filter.
Perform Powertrain Verification Test VER-2A.
No®Replace the Fuel Pump and Regulator Assembly.
Perform Powertrain Verification Test VER-2A.
5 Ignition Off.
Warning: The Fuel System must be opened and may be under high pressure.
Release the Fuel Pressure.
Connect a Fuel Pressure Gauge to test port.
Ignition On, Engine Not Running.
With the DRB, actuate Fuel System. Fuel Pressure should be 43 to 53 psi for Gasoline
Engines and 50 to 60 psi for Flexible Fuel Vehicle.
Record the Fuel Pressure reading.
Is the Fuel Pressure above the specification?ENGINE - 2.4L I-4
DOHC and/or EN-
GINE - 3.3L V6
and/or ENGINE -
3.3L V6 FFV and/or
ENGINE - 3.8L V6
Ye s®Go To 6
No®Go To 8
6 Ignition Off
Warning: The Fuel System must be opened and may be under high pressure.
Release the fuel pressure.
Remove the Fuel Pressure Gauge from the Fuel Rail.
Remove the Fuel Return Line between the Fuel Tank and Filter.
Adjust a shop air hose to 40 psi.
Using shop air, inspect the Fuel Line by attempting to blow air through it.
Is the Fuel Return Line restricted?All
Ye s®Replace the Fuel Return Line.
Perform Powertrain Verification Test VER-2A.
No®Go To 7
7 If there are no potential causes remaining, the Fuel Pressure Regulator is assumed
to be defective.
View repair options.All
Repair
Replace the Fuel Pressure Regulator.
Perform Powertrain Verification Test VER-2A.
238
DRIVEABILITY
* CHECKING FUEL DELIVERY ÐContinued
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TEST ACTION APPLICABILITY
1Note: Ensure the SKIM has proper communication and that there are no
SKIM DTC's present before continuing.
Ignition Off.
Ensure the Throttle Cables are not holding the Throttle open.
Is the Throttle held open?ENGINE - 3.0L V6
Ye s®Repair condition that holds the Throttle Body open.
Perform Powertrain Verification Test VER-1A.
No®Go To 2
2 Ignition On, Engine Not Running
With the DRB, actuate the Fuel System and check for Fuel Pump operation at the
Fuel Tank.
Is the Fuel Pump operating?ENGINE - 3.0L V6
Ye s®Go To 3
No®Go To 13
3 Ignition On, Engine Not Running
With DRB, read Throttle Position Sensor voltage.
Is the voltage above 1.5 volts?ENGINE - 3.0L V6
Ye s®Disconnect the TP Sensor Conn. Replace Throttle Position Sensor.
Perform Powertrain Verification Test VER-1A.
No®Go To 4
4 Ignition Off.
Warning: The Fuel System must be opened and may be under high pressure.
Relieve Fuel pressure.
Install a Fuel Pressure Gauge to the Fuel Rail.
Note: The Fuel Tank must be at least 1/4 full for the following tests.
Ignition On, Engine Not Running.
With the DRB, actuate the Fuel System.
Read the Fuel Pressure Gauge.
Fuel pressure should be 43 to 53 psi for Gasoline.
Is the Fuel pressure above the specification ?ENGINE - 3.0L V6
Ye s®Go To 5
No®Go To 8
5 Ignition Off.
Warning: The Fuel System must be opened and may be under high pressure.
Release the Fuel pressure.
Inspect Fuel Filter for a restriction.
Is there a restriction?ENGINE - 3.0L V6
Ye s®Replace the Fuel Filter.
Perform Powertrain Verification Test VER-1A.
No®Go To 6
279
STARTING
* CHECKING THE FUEL SYSTEM ÐContinued
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TEST ACTION APPLICABILITY
6 Ignition Off.
Warning: The Fuel System must be opened and may be under high pressure.
Release the Fuel pressure.
Inspect Fuel Filter for a restriction.
Is there a restriction?ENGINE - 3.0L V6
Ye s®Go To 7
No®Replace the Fuel Pressure Regulator.
Perform Powertrain Verification Test VER-1A.
7 Ignition Off.
Warning: The Fuel System must be opened and may be under high pressure.
Release the Fuel pressure.
Inspect Fuel Return Tube for restriction between fuel Filter and Fuel Pump Module.
Is there a restriction?ENGINE - 3.0L V6
Ye s®Replace restricted Fuel Tube.
Perform Powertrain Verification Test VER-1A.
No®Test Complete.
8 Ignition Off.
Warning: The Fuel System must be opened and may be under high pressure.
Relieve Fuel pressure.
Tee-In a Fuel Pressure Gauge into the Fuel Hose using tool #6433.
Note: The Fuel Tank must be at least 1/4 full for the following tests.
Ignition On, Engine Not Running.
With the DRB, actuate the Fuel System.
Read the Fuel Pressure Gauge.
Fuel pressure should be 43 to 53 psi for Gasoline.
Is the Fuel pressure below the specification ?ENGINE - 3.0L V6
Ye s®Go To 9
No®Test Complete.
9 Ignition Off.
Warning: The Fuel System must be opened and may be under high pressure.
Release Fuel pressure.
Remove adapter 6631 and reinstall Fuel Line.
Install adapter 6631 between Fuel Pump and Fuel Filter.
Connect Fuel Pressure Gauge to adapter 6631.
Key on.
With the DRB, actuate Fuel System.
Is the fuel pressure at least 2 psi higher than the previous reading?ENGINE - 3.0L V6
Ye s®Replace the Fuel Filter.
Perform Powertrain Verification Test VER-1A.
No®Go To 10
280
STARTING
* CHECKING THE FUEL SYSTEM ÐContinued
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TEST ACTION APPLICABILITY
24 Ignition Off.
Warning: The Fuel System must be opened and may be under high pressure.
Release the Fuel pressure.
Inspect Fuel Return Tube for restriction between fuel Filter and Fuel Pump Module.
Is there a restriction ?ENGINE - 2.0L,
2.4L I-4 DOHC
and/or ENGINE -
3.3L V6 FFV and/or
ENGINE - 3.3L V6
and/or ENGINE -
3.8L V6
Ye s®Replace restricted Fuel Tube.
Perform Powertrain Verification Test VER-1A.
No®Test Complete.
25 Ignition Off.
Warning: The Fuel System must be opened and may be under high pressure.
Relieve Fuel pressure.
Tee-In a Fuel Pressure Gauge into the Fuel Hose using tool #6433.
Note: The Fuel Tank must be at least 1/4 full for the following tests.
Ignition On, Engine Not Running.
With the DRB, actuate the Fuel System.
Read the Fuel Pressure Gauge.
Fuel pressure should be 43 to 53 PSI for Gasoline, 50 to 60 PSI for (E85) Ethanol.
Is the Fuel pressure below the specification ?ENGINE - 2.0L,
2.4L I-4 DOHC
and/or ENGINE -
3.3L V6 FFV and/or
ENGINE - 3.3L V6
and/or ENGINE -
3.8L V6
Ye s®Go To 26
No®Test Complete.
26 Ignition Off.
Warning: The Fuel System must be opened and may be under high pressure.
Release Fuel pressure.
Remove adapter 6631 and reinstall Fuel Line.
Install adapter 6631 between Fuel Pump and Fuel Filter.
Connect Fuel Pressure Gauge to adapter 6631.
Key On.
With the DRB, actuate Fuel System.
Is the fuel pressure at least 2 psi higher than the previous reading?ENGINE - 2.0L,
2.4L I-4 DOHC
and/or ENGINE -
3.3L V6 FFV and/or
ENGINE - 3.3L V6
and/or ENGINE -
3.8L V6
Ye s®Replace the Fuel Filter.
Perform Powertrain Verification Test VER-1A.
No®Go To 27
27 Ignition Off.
Warning: The Fuel System must be opened and may be under high pressure.
Release Fuel pressure.
Remove the Fuel Pump Module.
Inspect the Fuel Pump Inlet Strainer.
Is the Inlet Strainer plugged?ENGINE - 2.0L,
2.4L I-4 DOHC
and/or ENGINE -
3.3L V6 FFV and/or
ENGINE - 3.3L V6
and/or ENGINE -
3.8L V6
Ye s®Replace the Fuel Inlet Strainer.
Perform Powertrain Verification Test VER-1A.
No®Go To 28
284
STARTING
* CHECKING THE FUEL SYSTEM ÐContinued
ProCarManuals.com