evap gmc 1999 jimmy
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Filed Under (Honda) by admin on 05-11-2010
1. 2. 3. 4. Turn the ignition switch ON (II). Clear the DTC with the HDS. Remove the fuel fill cap for 5 seconds , then install it. Start the engine. Hold the engine speed at 3,000 rpm with no load (in Park or neutral) until the radiator fan comes on, then let it idle. Monitor the OBD STATUS for DTC P2422 in the DTCs MENU with the HDS. Does the screen indicate FAILED? YES – Go to step 6. NO – If the screen indicates PASSED, intermittent failure, system is OK at this time. Check for a poor connection or loose terminals at the EVAP canister vent shut valve and ECM/PCM. If the screen indicates NOT COMPLETED, go to step 2 and recheck. Clear the DTC with the HDS. Remove the EVAP canister vent shut valve from the EVAP canister. Connect the 2P connector to the EVAP canister vent shut valve. Turn the ignition switch ON (II). Do the EVAP CVS ON in the INSPECTION MENU with the HDS. 5. 6. 7. 8. 9. 10. 11. Check the EVAP canister vent shut valve (A) operation. Does the valve operate? YES – Check for a blockage in the EVAP canister, then install the EVAP canister vent shut valve, and go to step 14. NO – Go to step 12. 12. Turn the ignition switch OFF. 13. Replace the EVAP canister vent shut valve. 14. Turn the ignition switch ON (II). 15. Reset the ECM/PCM with the HDS. 16. Do the ECM/PCM idle learn procedure. 17. Turn the ignition switch OFF. 18. Remove the fuel fill cap for 5 seconds , then install it. 19. Start the engine. Hold the engine speed at 3,000 rpm with no load (in Park or neutral) until the radiator fan comes on, then let it idle. 20. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES – If DTC P2422 is indicated, check for poor connections or loose terminals at the FTP sensor or the EVAP canister vent shut valve and the ECM/PCM, then go to step 1. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC’s troubleshooting. NO – Go to step 21. 21. Monitor the OBD STATUS for DTC P2422 in the DTCs MENU with the HDS. Does the screen indicate PASSED? YES – Troubleshooting is complete. NO – If the screen indicates FAILED, check for poor connections or loose terminals at the FTP sensor or the EVAP canister vent shut valve and the ECM/PCM, then go to step 1. If the screen indicates NOT COMPLETED, go to step 16 and recheck.
Filed Under (Jeep) by admin on 22-04-2010
The evaporative emission system is designed to prevent the escape of fuel vapors from the fuel system. Leaks in the system, even small ones, can allow fuel vapors to escape into the atmosphere. Government regulations require onboard Testing to make sure that the evaporative (EVAP) system is functioning properly. The leak detection system tests for EVAP system leaks and blockage. It also performs self-diagnostics. During self-diagnostics, the Powertrain Control Module (PCM) first checks the Leak Detection Pump (LDP) for electrical and mechanical faults. If the first checks pass, the PCM then uses the LDP to seal the vent valve and pump air into the system to pressurize it. If a leak is present, the PCM will continue pumping the LDP to replace the air that leaks out. The PCM determines the size of the leak based on how fast/long it must pump the LDP as it tries to maintain pressure in the system. The main purpose of the LDP is to pressurize the fuel system for leak checking. It closes the EVAP system vent to atmospheric pressure so the system can be pressurized for leak Testing. The diaphragm is powered by engine vacuum. It pumps air into the EVAP system to develop a pressure of about 0.25 psi. A reed switch in the LDP allows the PCM to monitor the position of the LDP diaphragm. The PCM uses the reed switch input to monitor how fast the LDP is pumping air into the EVAP system. This allows detection of leaks and blockage.
Filed Under (Ford) by admin on 27-04-2010
FORD: 1990-1997 THUNDERBIRD 1990-1999 MUSTANG, TAURUS SHO 1991-1999 CROWN VICTORIA, ESCORT, TAURUS 1992-1994 TEMPO 1993-1997 PROBE 1995-1999 CONTOUR 1990 BRONCO II 1990-1997 AEROSTAR 1990-1999 RANGER 1991-1999 EXPLORER 1994-1996 BRONCO 1994-1997 F SUPER DUTY, F-250 HD 1994-1999 ECONOLINE, F-150, F-250 LD, F-350 1995-1999 WINDSTAR 1997-1999 EXPEDITION 1999 F-250 HD, SUPER DUTY F SERIES
LINCOLN: 1991-1999 CONTINENTAL, TOWN CAR 1993-1998 MARK VIII 1998-1999 NAVIGATOR
MERCURY: 1990-1997 COUGAR 1991-1999 GRAND MARQUIS, SABLE, TRACER 1992-1994 TOPAZ 1995-1999 MYSTIQUE 1997-1999 MOUNTAINEER
ISSUE SERVICE TIP
This TSB article is a diagnostic procedure to address vehicles that exhibit lean driveability MASS AIR FLOW (MAF) DISCUSSION symptoms and may or may not have any Diagnostic MAF sensors can get contaminated from a variety Trouble Codes (DTCs) stored in memory. of sources: dirt, oil, silicon, spider webs, potting
compound from the sensor itself, etc. When a MAF sensor gets contaminated, it skews the transfer Follow the diagnostic procedures described in the function such that the sensor over-estimates air flow following Service Tip. The revised diagnostic at idle (causes the fuel system to go rich) and procedure is a more accurate means of diagnosing under-estimates air flow at high air flows (causes
the symptoms. fuel system to go lean). This means Long Term Fuel Trims will learn lean (negative) corrections at idle and learn rich (positive) corrections at higher air flows.
Filed Under (GM) by admin on 04-06-2010
Models: 2008-2009 Chevrolet Colorado, TrailBlazer 2008-2009 GMC Canyon, Envoy 2008-2009 HUMMER H3, H3T 2008-2009 Saab 9-7X All Equipped With Engine RPOs LLR, LLV, LL8 Please Refer to GMVIS Condition Some customers may comment that the malfunction indicator lamp (MIL) is illuminated. Some customers may also comment that the engine runs rough. The technician may find DTCs P0300, P0301, P0302, P0303, P0304, P0305, or P0306 set as current or in history, depending on which engine the vehicle is equipped with. Upon further examination, the technician may observe evidence of water intrusion into the spark plug recess area. Cause This condition may be caused by an engine being exposed to a large quantity of water, which may result in some of the water seeping down past the vented threads of an ignition coil bolt, then flowing through the vent opening that is located in the bottom of the related ignition coil bolt hole, and collecting in the spark plug recess area. Correction Important: DO NOT reprogram or replace the engine control module (ECM) for this condition. If evidence of water intrusion in the spark plug recess area/s is not observed, then refer to the appropriate DTC procedures in SI.
Filed Under (Mazda) by admin on 18-04-2010
APPLICABLE MODEL(S)/VINS All 1999 Protege (1.6L) with VINs lower than JM1 BJ222* X0 140057. All 1999 – 2000 Miata with (1.8L) VINs lower than JM1 NB353* Y0 155947. DESCRIPTION A rattling noise may be heard from the engine when depressing the clutch or when revving the engine in neutral. In extreme cases, customers may experience noise at all times. This concern can be caused by improperly machined number 4 main cap of cylinder blocks which may result in premature wear of the thrust bearing. Customers having this concern should have their vehicle repaired using the following procedure
1. Verify customer concern. 2. Using a dial indicator, measure and record the crankshaft end play as shown (Protege). Rotate the crankshaft 180o, and again measure and record the crankshaft end play. – If end play is 0.3mm or more, proceed to STEP 3. – If end play is still less then 0.3mm, refer to the Work- shop Manual for further diagnostics. 3. Replace the applicable part per the Workshop Manual: • Protege – Short Engine • Miata – Partial Engine Note • Completely clean any parts that will be reused. 4. Verify the repair.