Download DTC P0442 Evaporative Emission (EVAP) System Small Leak Detected Refer to Engine Controls Routing Diagram, EVAP Control System Overview . System Description This DTC tests the evaporative emission (EVAP) system for a small leak. The control module monitors the fuel tank pressure (FTP) sensor signal to determine the vacuum decay rate. At an appropriate time, the control module turns the EVAP canister purge valve ON and the EVAP vent valve ON. This allows the engine to draw a vacuum on the EVAP system. At a calibrated time, or vacuum level, the control module turns the EVAP canister purge valve OFF, sealing the system, and monitors the FTP sensor input in order to determine the EVAP system vacuum decay. If the control module detects a leak larger than a calibrated amount, this DTC sets. The following table illustrates the relationship between the ON and OFF states, and the Open or Closed states of the EVAP canister purge and vent valves.… Read More

Download Models: 2002 and Prior Passenger Cars and Light Duty Trucks with Non-Enhanced and Enhanced EVAP Systems. Non-Enhanced EVAP System Diagnostic Procedure 1. Pinch off or plug the EVAP vapor line to seal the EVAP system. 2. Connect the EEST red battery clip to the positive (+) battery terminal. Connect the black battery clip to chassis ground. 3. Install the appropriate fuel fill cap adapter to the fuel fill pipe. Refer to the Service Information for the appropriate fuel fill cap adapter part number. 4. Connect the EEST’s nitrogen/smoke supply hose and vehicle fuel fill cap to the adapter. 5. Turn the nitrogen/smoke valve on the EEST control panel to SMOKE. 6. Use the remote switch to introduce smoke into the EVAP system for 60 seconds. Important: Additional smoke may need to be introduced at 15-second intervals until the leak source has been located. 7. Inspect the entire EVAP system for exiting smoke using the high intensity white light (J 41413-SPT).… Read More

Download odels: 1995-1996 Buick Roadmaster 1995-1999 Buick LeSabre 1995-2004 Buick Century, Regal 1995-2005 Buick Park Avenue 1996-1999 Buick Riviera, Skylark 2004-2005 Buick Rainier 1995-1999 Chevrolet Lumina, Monte Carlo, Fullsize Pickup Models (Old Style) 1995-2005 Chevrolet Blazer 1996 Chevrolet Lumina APV 1996-1999 Chevrolet Cavalier 1996-2000 Chevrolet Express Van 1996-2002 Chevrolet Astro Van 1997-2002 Chevrolet Camaro 1997-2003 Chevrolet Malibu 1997-2005 Chevrolet Corvette, Venture 2000-2005 Chevrolet Silverado 2002-2005 Chevrolet Avalanche, TrailBlazer, TrailBlazer EXT 2003-2005 Chevrolet SSR 2004-2005 Chevrolet Classic, Colorado 1995-1999 GMC Fullsize Pickup Models (Old Style) 1995-2002 GMC Jimmy 1996-2000 GMC Savana Van 1996-2002 GMC Safari Van 2000-2005 GMC Sierra 2002-2005 GMC Envoy, Envoy XL 2004-2005 GMC Canyon, Envoy XUV 1995-1999 Oldsmobile Aurora, Eighty Eight 1995-1997 Oldsmobile Cutlass Supreme 1999-2004 Oldsmobile Alero 1998-2002 Oldsmobile Intrigue 1995-1996 Oldsmobile Ninety Eight 1996-1999 Oldsmobile Achieva 1996-2004 Oldsmobile Bravada, Silhouette 1995-1999 Pontiac Bonneville, Sunfire 1995-2002 Pontiac Firebird 1995-2005 Pontiac Grand Prix 1996-1997 Pontiac Trans Sport 1996-2000 Pontiac Grand Am 1997-2005 Pontiac Montana 2003-2005 HUMMER H2.… Read More

Download 2004 Chevrolet Chevy Suburban – 4WD | Avalanche, Escalade, Suburban, Tahoe, Yukon (VIN C/K) Service Manual. Information on Gradual Coolant Loss Over Time with No Evidence of Leak Found. Models: 2004-2006 Buick Rainier 2001-2006 Cadillac Escalade Models 2001-2006 Chevrolet Avalanche, Blazer, Silverado, Suburban, Tahoe, TrailBlazer Models 2001-2006 GMC Envoy, Jimmy, Sierra, Yukon Models 2001-2004 Oldsmobile Bravada 2005-2006 Saab 9-7X with 4.8L or 5.3L VORTEC® GEN III, GEN IV V8 Engine (VINs V, T, M, B, Z – – RPOs LR4, LM7, LH6, L33, L59) Some vehicles may experience a gradual coolant loss over time. A very low percentage of cylinder head(s) manufactured with an embossed Castech logo may develop a porosity crack in a very specific area. Inspect the cylinder head assembly to determine if the casting was manufactured by Castech. This can be accomplished by inspecting for their casting logo located on top of the intake port, under the rocker arm support rail and in the spring deck cavity portion of the cylinder head.… Read More

Download IF YOU CONFIRM: A MIL “ON” with one or more of the following DTC(s) stored: • P0442 / P0448 / P0455 / P0456 / P1446 AND • EVAP Vent Control S/V is stuck open or will not seal when operated/closed. ACTIONS: 1. Replace the EVAP Vent Control S/V. 2. Install the Filter Kit (refer to the Service Procedure in this bulletin). 3. Clear any DTCs stored in the ECM. SERVICE PROCEDURE Replace Vent Control Valve 1. Replace the EVAP Vent Control S/V. • Refer to section EC in the Service Manual for replacement information. Install Filter Kit 1. Remove the spare tire. 2. Remove the EVAP canister mounting bolt (see Figure 1). • The canister will drop about 3 inches which will give you working room at the top. 3. Disconnect the vent hose (see Figure 1). 4. Reach above the EVAP canister and disconnect the vent hose at the vent control valve and remove the hose (see Figure 2).… Read More

Download 1. Turn OFF the ignition. 2. Raise the vehicle. Refer to Lifting and Jacking the Vehicle in General Information. 3. Disconnect the electrical connector. 4. Remove the EVAP vent valve bracket bolt. 5. Remove the EVAP vent valve from the bracket. 6. Disconnect the vent hose from the EVAP vent valve. 7. Remove the EVAP vent valve. Installation Procedure 1. Install the EVAP vent valve on bracket. 2. Connect the vent hose. Canister vent hose should be routed below the fuel tank fill and vent hoses. Notice Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener.… Read More