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1998 chevy lumina disable vats system

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1998 Chevy Truck S10/ T10 Blazer 2WD Evaporator Core Service and Repair Manual

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Manual A/C REMOVAL PROCEDURE CAUTION: Refer to Battery Disconnect Caution in Service Precautions. 1. Disconnect the negative battery cable. 2. Remove the right side instrument panel sound insulator. 3. Remove the instrument panel storage compartment. 4. Disconnect the passenger side SIR. 5. Remove the lower right instrument panel mounting bolt. 6. Remove the left and right front speaker grilles. 7. Remove the center instrument panel sound insulator. 8. Remove the left side instrument panel sound insulator. 9. Disconnect the park brake release cable. 10. Remove the knee bolster. 11. Remove the lower left instrument panel mounting bolt. 12. Remove the BCM. 13. Disconnect the driver side SIR. 14. Remove the instrument panel cluster. 15. Remove the radio. 16. Remove the HVAC control assembly. 17. Remove the steering column retaining retaining nuts. 18. Lower the steering column. 19. Remove the instrument panel carrier. 20. Remove the left and right cowl vent grille panels. 21. Disconnect the underhood lamp electrical connector, if equipped. 22. Remove the hood. 23. Remove the VCM. 24. Remove the coolant recovery tank. 25. Remove the heater hoses. 26. Disconnect the electrical connectors from the grille mounted lamps. 27. Remove the right front headlamp assembly. 28. Remove the front bumper. 29. Remove the right wheelhouse panel. 30. Disconnect the radio antenna cable. 31. Disconnect the electrical connector for the horn. 32. Remove the right fender. 33. Remove the evaporator case heat shield, if equipped. 34. Remove the blower motor resistor. 35. Remove the evaporator case bolts and screws. 36. Remove the accumulator. 37. Remove the condenser to the evaporator line fitting. 38. Remove the bolts which retain the evaporator case to the bulkhead. 39. Pull back lightly on the heater case to remove the evaporator case. 40. Remove the evaporator case retaining screws. 41. Disassemble the evaporator case sections, and remove the evaporator core. NOTE: If replacing the evaporator core, remove the expansion (orofice) tube and install it into the new core. INSTALLATION PROCEDURE 1. Install the evaporator core. 2. Assemble the evaporator case sections. 3. Install the evaporator case retaining screws. Tighten to 2.5 N.m (24 in lb) . 4. Install the evaporator core assembly to the vehicle. 5. Install the bolts which retain the evaporator case to the bulkhead. Tighten the bolts to 4.5 N.m (40 lb in) . 6. Install the condenser to the evaporator line fitting. 7. Install the accumulator. 1998 Chevy Truck S10/T10 Blazer 2WD 8. Install the evaporator case bolts and screws. Tighten to 2.5 N.m (24 In in) . 9. Install the blower motor resistor. 10. Install the evaporator case heat shield, if equipped. 11. Install the right fender. 12. Connect the electrical connector for the horn. 13. Install the radio antenna cable. 14. Install the right wheelhouse panel. 15. Install the front bumper. 16. Install the right front headlamp assembly. 17. Connect the electrical connectors to the grille mounted lamps. 18. Install the heater hoses. 19. Install the coolant recovery tank. 20. Install the VCM. 21. Install the hood. 22. Connect the underhood lamp electrical connector, if equipped. 23. Install the left and right cowl vent grille panels. 24. Install the instrument panel carrier. 25. Reposition the the steering column, and install the steering column retaining nuts. 26. Install the HVAC control assembly. 27. Install the radio. 28. Install the instrument panel cluster. 29. Connect the driver side SIR. 30. Install the BCM. 31. Install the lower left instrument panel mounting bolt. 32. Install the knee bolster. 33. Connect the park brake release cable. 34. Install the left side instrument panel sound insulator. 35. Install the center instrument panel sound insulator. 36. Install the left and right front speaker grilles. 37. Install the lower right instrument panel mounting bolt. 38. Connect the passenger side SIR. 39. Install the instrument panel storage compartment. 40. Install the right side instrument panel sound insulator. 41. Connect the negative battery cable. 42. Inspect the system for leaks.

How to bypass the VATS (PASSKey II) system in a late model GM vehicle

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Pontiac 1994-1996 Grand Prix 1992-1999 Bonneville 1993-2002 Firebird/Trans Am/Firehawk Buick 1994-1996 Regal 1992-1999 LeSabre 1991-1996 Park Avenue 1991-1996 Roadmaster Oldsmobile 1994-1997 Cutlass Supreme 1992-1999 Eighty Eight/LSS/Ninety Eight/Regency 1991-1996 Custom Cruiser Wagon Chevrolet 1995-1999 Monte Carlo 1995-2001 Lumina 1993-2002 Camaro 1986(?)-1996 Corvette (C4) Cadillac How to bypass the VATS system in a late model GM vehicle Bullet-Style” solderless connectors Heat Shrink Tubing Resistors of varying values (totalling the resistance measured across the key’s “pellet”) Alright, let’s begin the madness: 1. Take your DMM, set it to measure Ohms (use the 20k setting.) Measure the resistance across the pellet of the ignition key. Place one probe on the silver part of one side of the pellet, and the other probe on the other side. Write this value down. 2. Purchase a resistor or resistors that add up to the value measured in step 1. Radio Shack is a great place to go for the resistors, heat shrink tubing, and the “bullet-style” solderless connectors. 3. Take the 16 ga. wire and cut into 2 four-inch pieces. 4. Strip off approx 1/16″ of insulation off each side of both wire pieces. 5. Put your resistors together in series (or if you’re lucky and have a chip that has a resistance that matches a single resistor) and solder one wire to one end of the resistor(s) and the other wire to the other side. Example: You measure 11.72 on the 20k (k meaning kilo or 1,000) scale. The closest match is 11.801 which is a #15 “chip.” Always remember that resistors have a tolerance of 2%, meaning the resistance value of the “pellet” can be either 2% higher or 2% lower than 11.801 k ohms (11.72 falls in tolerance range.) You will want to aim for 11,801 ohms. So when you go to Radio Shack you want to pick up a 10,000 ohm (10k,) a 1,000 ohm (1k,) and an 800 ohm resistors to wire together in series to achieve the 11.801k ohm value.

1984-1998 Jeep Wagoneer/ Commando/ Cherokee Emission Controls Crankcase Ventilation System (PCV/CCV)

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CCV Fitting See Figures 2 and 3 1. With the engine running, remove the CCV fitting. a. If the fitting is not plugged, a hissing noise will be heard as air passes through the valve. A strong vacuum should also be felt when a finger is placed over the fitting. b. Install the CCV fitting. c. Remove the fresh air hose from the air cleaner assembly and loosely hold a piece of paper over the open end of the hose. After allowing about one minute for the crankcase pressure to reduce, the paper should be sucked against the opening with a noticeable amount of force. 2. Turn the engine OFF . Remove the metered orifice fitting, and check for a plugged condition. A clicking noise should be heard to indicate that the valve mechanism is free. 3. If the crankcase ventilation system meets the tests in Steps 1 and 2 above, no further service is required. If not, the CCV fitting must be cleaned and the system checked again. 4. If Step 1c fails when the CCV fitting is cleaned, it will be necessary to replace the molded vacuum hose with a new one, and to clean the metered orifice port. 5. Clean or replace the engine air cleaner filter element with a new one-for more details, refer to the air cleaner procedure located in General Information & Maintenance. Fig. 2: CCV system diagram for 4.0L engine Fig. 3: CCV system diagram for the 2.5L engine Evaporative Emission Control System OPERATION The evaporative emission control system prevents the release of unburned hydrocarbons, from gasoline or gasoline vapor, into the atmosphere. When pressure in the fuel tank is below 3 psi (20 kPa), the pressure relief/rollover valves open allowing fuel vapors to flow to the evaporative canister where they are absorbed by a charcoal mixture. This prevents excessive pressure buildup in the fuel system. Most canisters are equipped with a calibrated orifice at the inlet to the canister.

2004 Chevrolet Chevy K Silverado – 4WD Evaporative Emission (EVAP) Canister Vent Solenoid Valve Replacement Pickup

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Evaporative Emission (EVAP) Canister Vent Solenoid Valve Replacement Pickup Removal Procedure Important Clean the evaporative emission (EVAP) connections and surrounding areas prior to disconnecting the fittings in order to avoid possible system contamination. 1. Raise and suitably support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information. 2. Remove the harness clip from the canister vent solenoid (CVS) line. 3. Disconnect the CVS electrical connector. 2004 Chevrolet Chevy K Silverado – 4WD 4. If the vehicle is equipped with a 6 ft box, disconnect the EVAP CVS line from the canister. 5. Remove the CVS clip from the frame crossmember. 6. Push in the retainer and remove the CVS from the fuel tank clip. 7. If the vehicle is equipped with a 8 ft box, disconnect the EVAP CVS line from the canister. 8. Remove the CVS clip from the frame crossmember. 9. Push in the retainer and remove the CVS from the fuel tank clip. Installation Procedure 1. If the vehicle is equipped with a 8 ft box, install the CVS to the fuel tank until the clip engages. Important On vehicles equipped with a 8 ft box, the CVS line is routed below the frame crossmember. 2. Install the CVS clip to the frame crossmember. 3. Connect the EVAP CVS line to the canister. 4. If the vehicle is equipped with a 6 ft box, install the CVS to the fuel tank until the clip engages. Important On vehicles equipped with a 6 ft box, the CVS line is routed above the frame crossmember. 5. Install the CVS clip to the frame crossmember. 6. Connect the EVAP CVS line to the canister. 7. Connect the CVS electrical connector. 8. Install the harness clip to the canister vent solenoid (CVS) line. 9. Lower the vehicle.

1998 Chevrolet Chevy K Pickup DTC P1626 Theft Deterrent Fuel Enable Signal Not Received Repair Manual

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An intermittent may be caused by any of the following conditions: Thoroughly check any circuitry that is suspected of causing the intermittent complaint. Refer to Intermittents and Poor Connections Diagnosis in Wiring Systems. If a repair is necessary, refer to Wiring Repairs or Connector Repairs in Wiring Systems. Test Description The number(s) below refer to the step number(s) on the diagnostic table. 2. This test checks if communication can be established between the scan tool and the VTD. If the scan tool cannot communicate with the VTD, refer to Diagnostic System Check – Theft Deterrent in Theft Deterrent. 3. This test checks for any opens in the serial data circuit between the VCM and the VTD. This also checks for any intermittent malfunctions associated with the serial data circuit. 4. This step is to determine if the condition that set the DTC is still present. The engine must be cranked in order to set this DTC. If the condition is present, the engine will start and then stall, indicating the VCM is disabling fuel. 7. Use a scan tool to clear and check for any DTCs in all the modules connected to the Class 2 Serial Data circuit (VCM, VTD, ATC, and BCM). the module itself. After repairing the cause of DTC P1626, clear all DTCs from the systems capable of storing this DTC and DTC U1192. 1 Important: Before clearing the DTCs, use the scan tool Capture Info to save the Freeze Frame and Failure Records for reference. The control module’s data is deleted once the Clear Info function is used. Did you perform the Powertrain On-Board Diagnostic (OBD) System Check? — Go to Step 2 Go to Powertrain On Board Diagnostic (OBD) System Check 2 1. Install the scan tool. 2. Turn ON the ignition leaving the engine OFF. 3. Attempt to establish communications with the VTD (Passlock) Control Module. Does the scan tool communicate with the VTD (Passlock) Control Module? — Go to Step 3 Go to Diagnostic System Check – Theft Deterrent in Theft Deterrent 3 Check the Class 2 Serial Data circuit for the following intermittent conditions: Did you find a problem? • An open in the Class 2 Serial Data circuit between the VCM and the VTD (Passlock) Control Module. • A short to ground. • A short to voltage. • Loose or damaged terminals at the DLC, VCM or the VTD (Passlock) Control Module. — Go to Step 6 Go to Step 4 4 1. Turn OFF the ignition. 2. Connect or install any connectors or components that were disconnected or removed. 3. Clear all DTCs using a scan tool. 4. Turn OFF the ignition for 15 seconds. 5. Attempt to start the engine. Does DTC P1626 reset? — Go to Diagnostic System Check – Theft Deterrent in Theft Deterrent Go to Step 5 5 This DTC is intermittent. Are any additional DTCs stored? — Go to the applicable DTC table Go to Diagnostic Aids 6 Repair the circuit as necessary. Refer to Wiring Repairs or Connector Repairs in Wiring Systems. Is the action complete?