Engine Controls - Removal & Installation: Other Chevrolet Suburban X

AIR INDUCTION SYSTEMS

THROTTLE BODY

COMPUTERIZED ENGINE CONTROLS

Note. All vehicles are equipped with a Powertrain Control Module (PCM) for engine control.

ELECTRICALLY ERASABLE PROGRAMMABLE READ-ONLY MEMORY

The Electrically Erasable Programmable Read-Only Memory (EEPROM) is a permanent memory that is part of PCM. EEPROM cannot be replaced. EEPROM contains program and calibration information that PCM uses to control powertrain. If PCM is replaced, ensure NEW PCM software/calibration is correct and is most recent version for vehicle. EEPROM must be programmed when NEW PCM is installed. Program EEPROM using latest software for that specific vehicle. See COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION.

POWERTRAIN CONTROL MODULE

Note. Before replacing PCM, carefully inspect all wiring and control components. Failure to test for short circuits may result in repeated PCM failure due to shorts and Quad-Driver failure. To prevent internal damage to PCM, ensure ignition switch is in OFF position when connecting or disconnecting PCM harness connectors or any electrical components. Inspect PCM connector gaskets and ensure they are installed correctly. PCM connector gaskets prevent contaminants from entering PCM.

1. Ensure ignition is off. Disconnect negative battery cable. Locate PCM at left front corner of engine compartment. (Scheme 32) Release PCM cover from mounting tabs on PCM bracket.
2. Remove PCM cover from PCM. Loosen PCM harness connector bolts. (Scheme 33) Disconnect PCM harness connectors. Release the PCM spring latch. Release PCM mounting tabs. Remove PCM.

Scheme 32

Scheme 33

1. Install PCM to bracket. Ensure PCM mounting tabs are engaged. Secure PCM spring latch. Connect harness connectors to PCM. Tighten PCM harness connector bolts to specification. See «TORQUE SPECIFICATIONS»(ref-159266-S33064853322003112100000) .
2. Install PCM cover. Reconnect negative battery cable. If NEW PCM has been installed, PCM MUST be programmed. See COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION.

Throttle Actuator Control (TAC) module is located in rear of engine compartment, near underhood fuse block. (Scheme 34) Disconnect TAC module harness connectors. Remove TAC module nuts.

Install TAC module and TAC module nuts. Connect TAC module harness connectors.

Scheme 34

CKP SYSTEM VARIATION LEARN PROCEDURE

Note. The Crankshaft Position (CKP) system variation learn procedure is required when the following service procedures have been performed, regardless of whether DTC P0315 is set: CKP sensor replacement. Engine replacement. PCM replacement. Harmonic balancer replacement. Crankshaft replacement. Any engine repairs which disturb the CKP sensor relationship. For additional diagnostic information, see DTC P0315: CRANKSHAFT POSITION SENSOR VARIATION NOT LEARNED under DIAGNOSTIC TESTS in appropriate SELF-DIAGNOSTICS article.

1. Install a scan tool to Data Link Connector (DLC).
2. With a scan tool, monitor the powertrain control module for DTCs. If only DTC P0315 is set, go to next step. If a DTC other than P0315 is set, diagnose that DTC first. See DIAGNOSTIC TROUBLE CODE DEFINITIONS in appropriate SELF-DIAGNOSTICS article.
3. With a scan tool, select the CRANKSHAFT POSITION VARIATION LEARN PROCEDURE.
4. The scan tool instructs you to perform the following: Set parking brake. Block drive wheels. DO NOT apply brake pedal. Observe fuel cut-off for applicable engine. Accelerate to Wide Open Throttle (WOT). Release throttle when fuel cut-off occurs. Engine should not accelerate beyond calibrated RPM value. Release throttle immediately if value is exceeded. Cycle ignition from OFF to ON. Apply and hold brake pedal. Start and idle engine. Turn A/C OFF. Vehicle must remain in Park or Neutral. The scan tool monitors certain component signals to determine if all the conditions are met to continue with the procedure. The scan tool only displays the condition that inhibits the procedure. The scan tool monitors the following components: Crankshaft Position (CKP) sensor activity. If there is a CKP sensor condition, refer to the applicable DTC that set. See DIAGNOSTIC TROUBLE CODE DEFINITIONS in appropriate SELF-DIAGNOSTICS article. Camshaft Position (CMP) sensor activity. If there is a CMP sensor condition, refer to the applicable DTC that set. See DIAGNOSTIC TROUBLE CODE DEFINITIONS in appropriate SELF-DIAGNOSTICS article. Engine Coolant Temperature (ECT). If the engine coolant temperature is not warm enough, idle the engine until the engine coolant temperature reaches the correct temperature.
5. With the scan tool, enable the crankshaft position system variation learn procedure.
6. Slowly increase the engine speed to the RPM that you observed.
7. Immediately release the throttle when fuel cut-off is reached.
8. The scan tool displays Learn Status: Learned this ignition. If the scan tool does NOT display this message and no additional DTCs set, see DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS under SELF-DIAGNOSTIC SYSTEM in appropriate SELF-DIAGNOSTICS article. If a DTC set, see DIAGNOSTIC TROUBLE CODE DEFINITIONS in appropriate SELF-DIAGNOSTICS article.
9. Turn OFF the ignition for 30 seconds after the learn procedure is completed successfully.

Note. Service of the PCM should normally consist of either replacement of the PCM or EEPROM programming. If the diagnostic procedures call for the PCM to be replaced, the PCM should be checked first to see if it is the correct part. If it is, remove the faulty PCM and install the new service PCM. The service PCM EEPROM will not be programmed. DTC P0601 and P0602 indicates the EEPROM is not programmed or has malfunctioned.

Note. Programing Powertrain Control Module requires a compatible scan tool and a Techline® terminal. Procedure uses a Tech 2 scan tool.

Remote Programming

Note. DO NOT program a control module unless you are directed by a service procedure or you are directed by a technical service bulletin. Programming a control module at any other time will not permanently correct a customer's concern.

1. Turn OFF the ignition.
2. Install the Tech 2® to the data link connector (DLC), with the Tech 2® turned OFF.
3. Turn ON Tech 2®. Press ENTER at title screen.
4. Turn ON the ignition, with the engine OFF.
5. Turn OFF all vehicle accessories.
6. Select SERVICE PROGRAMMING SYSTEM at the MAIN MENU.
7. Select REQUEST INFO.
8. Enter the vehicle description by following the on-screen instructions.
9. Verify that the correct VIN is entered on the Tech 2® and select YES.
10. Turn OFF the Tech 2®.
11. Disconnect the Tech 2® from the vehicle.
12. Turn OFF the ignition.
13. Connect the Tech 2® to the terminal.
14. Launch the TIS application at the terminal.
15. Select the SERVICE PROGRAMMING SYSTEM at the main screen.
16. Highlight the following information on the Select Diagnostic Tool and Programming Process Screen: Select DIAGNOSTIC TOOL, then select Tech 2. Select PROGRAMMING PROCESS. Identify whether an existing module is being reprogrammed or a module is being replaced with a new one. Select ECU LOCATION. Select vehicle.
17. Select NEXT.
18. Verify the connections and select NEXT.
19. Verify the VIN and select NEXT.
20. Select the appropriate controller for the vehicle being serviced.
21. Select the type of programming to be performed from the following categories: NORMAL - Used for updating an existing calibration or programming a new controller. VEHICLE CONFIGURATION INDEX (VCI) - Used for updating an existing controller or programming a new controller for newer vehicles whose VINs are not yet in the database. RECONFIGURE - Used to reconfigure a vehicle for changes in tire size and/or axle ratios.
22. Select NEXT.
23. Select the appropriate calibration file for the vehicle being serviced.
24. Select NEXT.
25. Verify your selection on the Summary screen.
26. Select NEXT.
27. Perform the CRANKSHAFT POSITION VARIATION RELEARN PROCEDURE using the SPECIAL FUNCTIONS feature, if applicable.
28. Close the application and return to the TIS APPLICATION SELECTION screen after the download is complete.
29. Turn OFF the Tech 2®.
30. Disconnect the Tech 2® from the terminal.
31. Connect the Tech 2® to the vehicle DLC, with the engine and the Tech 2® OFF.
32. Turn ON the Tech 2®.
33. Press ENTER at the TITLE screen.
34. Turn ON the ignition, with the engine OFF.
35. Select SERVICE PROGRAMMING SYSTEM.
36. Select the PROGRAM ECU function on the Tech 2.
37. Verify the VIN and calibration numbers, select CONTINUE.
38. Follow the on-screen instructions and select CONTINUE.
39. Select CONTINUE and exit the program after the Tech 2 displays PROGRAMMING WAS SUCCESSFUL.
40. Turn OFF the ignition.
41. Turn OFF the Tech 2.
42. Disconnect the Tech 2 from the vehicle.
43. Verify the control module programming was successful. Turn OFF the ignition for 30 seconds.
44. Start the engine. Repeat the Service Programming System procedure if the vehicle does not start or starts but runs rough.

Off-Board Remote Programming

Note. The Off-Board Programming Adapter Kit (J 41207-C) is required when a module must be programmed without having the vehicle present. The adapter allows the module to be turned ON and communicate with the scan tool.

1. Obtain the Vehicle Identification Number (VIN) of the vehicle for which the module is being programmed.
2. Launch the TIS application at the terminal.
3. Select the SERVICE PROGRAMMING SYSTEM.
4. Highlight the following information on the Select Diagnostic Tool and Programming Process Screen: Select DIAGNOSTIC TOOL, then select Tech 2. Select PROGRAMMING PROCESS. Identify whether an existing module is being reprogrammed or a module is being replaced with a new one. Select ECU LOCATION. Select OFF-BOARD PROGRAMMING ADAPTER.
5. Select NEXT.
6. Follow the directions on the Preparing for Communication screen for connecting the following components: The control module. The Off-Board Programming Adapter (OBPA). Refer to the TIS users guide for a listing of the OBPA. The Tech 2.
7. Select the SERVICE PROGRAMMING REQUEST INFORMATION function on the Tech 2.
8. Follow the Tech 2 instructions to obtain the module data and security information.
9. After the Tech 2 has received the data from the module, exit the Request Info mode.
10. Disconnect the Tech 2 from the OBPA.
11. Turn OFF the Tech 2.
12. Connect the Tech 2 to the terminal.
13. Turn ON the Tech 2.
14. Select NEXT at the terminal after the Tech 2 start-up screen appears.
15. Enter the VIN of the vehicle that will be receiving the control module.
16. Select NEXT.
17. Select the type of programming to be performed from the following categories: NORMAL - Used for updating an existing calibration or programming a new controller. VEHICLE CONFIGURATION INDEX (VCI) - Used for updating an existing controller or programming a new controller for newer vehicles whose VINs are not yet in the database. RECONFIGURE - Used to reconfigure a vehicle for changes in tire size and/or axle ratios.
18. Select NEXT.
19. Select a calibration on the Calibration Selection screen, if necessary.
20. Ensure all the desired folder tabs have a green check mark.
21. Select NEXT.
22. Verify the current and the selected calibration of the control module on the Summary screen.
23. Select NEXT.
24. Select OK.
25. On model year 1996 and newer controllers, a Crankshaft Position (CKP) relearn procedure box may appear. Select OK.
26. Follow the on-screen instructions, if any, when the Program Controller/Programming Complete screen appears.
27. Select CLOSE.
28. Turn OFF the Tech 2.
29. Disconnect the Tech 2 from the terminal.
30. Connect the Tech 2 to the OBPA.
31. Turn ON the Tech 2.
32. Select Enter at the title screen.
33. Select the SERVICE PROGRAMMING SYSTEM at the Main Menu.
34. Select the PROGRAM ECU function.
35. Select CONTINUE.
36. Follow the on-screen instructions.
37. Select Continue.
38. Select EXIT when the programming is complete.
39. Turn OFF the OBPA.
40. Turn OFF the Tech 2.
41. Disconnect the OBPA from the Tech 2 and the control module.

Off-Board Pass-Thru Programming

Note. The Off-Board Programming Adapter Kit (J 41207-C) is required when a module must be programmed without having the vehicle present. The adapter allows the module to be turned ON and communicate with the scan tool.

1. Launch the TIS application at the terminal.
2. Select the SERVICE PROGRAMMING SYSTEM.
3. Highlight the following information on the Select Diagnostic Tool and Programming Process Screen: Select DIAGNOSTIC TOOL, then select PASS-THRU. Select PROGRAMMING PROCESS. Identify whether an existing module is being reprogrammed or a module is being replaced with a new one. Select ECU LOCATION. Select OFF-BOARD PROGRAMMING ADAPTER.
4. Select NEXT.
5. Complete all terminal-directed data at the Preparing for Communication/Determine Vehicle screen until NEXT is highlighted.
6. Select NEXT.
7. Follow the on-screen instructions for connecting the following components: The control module. The Off-Board Programming Adapter (OBPA). Refer to the TIS users guide for a listing of the OBPA. The Tech 2.
8. Select NEXT.
9. Pass-Thru displays the VIN stored in the control module. If a new control module is being programmed, enter the correct VIN of the vehicle.
10. Select NEXT.
11. Select the appropriate options if the Options screen appears.
12. Select NEXT.
13. Select the type of programming to be performed from the following categories: NORMAL - Used for updating an existing calibration or programming a new controller. VEHICLE CONFIGURATION INDEX (VCI) - Used for updating an existing controller or programming a new controller for newer vehicles whose VINs are not yet in the database. RECONFIGURE - Used to reconfigure a vehicle for changes in tire size and/or axle ratios.
14. Select NEXT.
15. Select a calibration on the Calibration Selection screen, if necessary.
16. Ensure all the desired folder tabs have a green check mark.
17. Select NEXT.
18. Verify the current and the selected calibration of the control module on the Summary screen.
19. Select NEXT.
20. Select OK.
21. On model year 1996 and newer controllers, a Crankshaft Position (CKP) relearn procedure box may appear. Select OK.
22. Follow the on-screen instructions, if any, when the Program Controller/Programming Complete screen appears.
23. Select CLOSE.
24. Turn OFF the OBPA.
25. Turn OFF the Tech 2.
26. Disconnect the OBPA from the Tech 2 and the control module.

Pass-Thru Programming

Note. Pass-Thru programming allows the scan tool to remain connected to the terminal and to the vehicle throughout the programming process. The vehicle must be in close proximity to the terminal while using Pass-Thru.

1. Launch the TIS application at the terminal.
2. Select the SERVICE PROGRAMMING SYSTEM.
3. Highlight the following information on the Select Diagnostic Tool and Programming Process Screen: Select DIAGNOSTIC TOOL, then select PASS-THRU. Select PROGRAMMING PROCESS. Identify whether an existing module is being reprogrammed or a module is being replaced with a new one. Select ECU LOCATION. Select VEHICLE.
4. Select NEXT.
5. Complete all terminal-directed data on the Preparing for Communication/Determine Vehicle screen until NEXT is highlighted.
6. Select NEXT.
7. Follow the instructions on the Preparing for Communication screen.
8. Select NEXT.
9. Verify the VIN on the VALIDATE VEHICLE IDENTIFICATION NUMBER screen.
10. Select NEXT.
11. If an option screen appears, verify the vehicle configuration and/or RPO information.
12. Select NEXT.
13. Highlight the appropriate control module and programming type on the SUPPORTED CONTROLLERS screen.
14. Select NEXT.
15. Select the proper calibrations on the CALIBRATION SELECTION screen.
16. Ensure all the folder tabs have a green check mark.
17. Select NEXT.
18. Verify the current calibrations with the selected calibrations.
19. Select NEXT.
20. The TRANSFER DATA screen will appear until the progress bar reaches 100 percent. This may take up to 30 minutes.
21. Complete all of the terminal-directed data on the PROGRAMMING COMPLETE screen.
22. Turn OFF the Tech 2.
23. Disconnect the Tech 2® from the vehicle.

ACCELERATOR PEDAL POSITION SENSOR

Note. Handle the electronic throttle control components carefully. Use cleanliness in order to prevent damage. DO NOT drop the electronic throttle control components. DO NOT roughly handle the electronic throttle control components. DO NOT immerse the electronic throttle control components in cleaning solvents of any type.

Turn ignition off. Remove hush panel under left side of instrument panel. Disconnect Accelerator Pedal Position (APP) sensor harness connector. APP sensor is located behind accelerator pedal. (Scheme 35) Reposition carpet as necessary to access lower APP sensor retaining bolt. Remove 2 APP sensor retaining bolts. Remove APP sensor.

Install APP sensor. Tighten 2 APP sensor retaining bolts to specification. See TORQUE SPECIFICATIONS . To complete installation, reverse removal procedure.

Scheme 35

ENGINE COOLANT TEMPERATURE SENSOR

1. Turn ignition off. Disconnect negative battery cable. Drain coolant below level of Engine Coolant Temperature (ECT) sensor into a suitable container. Disconnect ECT sensor harness connector.
2. On 4.8L, 5.3L and 6.0L models, ECT sensor is located on left side of engine, near front of exhaust manifold. (Scheme 36)
3. On 8.1L models, ECT sensor is located on right side of engine, near middle of cylinder head. (Scheme 37) On all models, remove ECT sensor.

Scheme 36

Scheme 37

1. Whenever ECT sensor is removed, coat threads with Sealer (12346004) before reinstallation. Install ECT sensor into engine and tighten to specification. See «TORQUE SPECIFICATIONS»(ref-159266-S33064853322003112100000) .
2. Reconnect harness connector to ECT sensor. Reconnect negative battery cable. Fill and bleed cooling system.

FUEL COMPOSITION SENSOR

Note. Fuel composition sensor is only used on models equipped with a flex-fuel 5.3L (RPO code L59).

MASS AIRFLOW SENSOR

1. Loosen hose clamps on both ends of air inlet tube. (Scheme 38) Remove upper radiator hose clip from air inlet tube. Remove air inlet tube.
2. Disconnect MAF sensor harness connector. Loosen MAF sensor-to-air cleaner hose clamp. Pull MAF sensor from air cleaner assembly.

To install, reverse removal procedure. Ensure arrow on MAF sensor is pointing away from air cleaner. Tighten MAF sensor hose clamps and air inlet tube hose clamp to specification. See TORQUE SPECIFICATIONS .

Scheme 38

OXYGEN SENSORS

Note. On 8.1L models, it may be necessary to lower the exhaust system to gain sufficient access to a HO2S and/or HO2S harness connector. Front Heated Oxygen Sensors (HO2S1, bank 1 and HO2S2, bank 1) are located in the exhaust pipes, below the respective exhaust manifold. (Scheme 39) Rear Heated Oxygen Sensors (HO2S1, bank 2 and HO2S2, bank 2) are mounted in the exhaust pipes, behind the respective catalytic converter. Oxygen sensors are equipped with a permanent pigtail which must remain intact when removing sensor.

1. Turn ignition off. Raise and support vehicle. Ensure oxygen sensor is free of contaminants. DO NOT use cleaning solvents of any type. Oxygen sensor may be difficult to remove when engine temperature is less than 120°F (48°C). Excessive removal force may damage threads in exhaust pipe.
2. Disconnect harness connector from appropriate HO2S. Carefully remove HO2S from exhaust pipe using Oxygen Sensor Tool (J-39194-B).

1. Whenever oxygen sensor is removed, coat threads with anti-seize compound (5613695) before reinstallation. New oxygen sensors already have this compound applied to threads.
2. Install oxygen sensor into exhaust pipe using Oxygen Sensor Tool (J-39194-B). Tighten oxygen sensor to specification. See «TORQUE SPECIFICATIONS»(ref-159266-S33064853322003112100000) . Reconnect harness connector to oxygen sensor. Lower vehicle. Test system.

Scheme 39

THROTTLE POSITION SENSOR

Throttle Position (TP) sensor is not serviceable separately. Throttle body and TP sensor must be serviced as a complete assembly. See THROTTLE BODY under AIR INDUCTION SYSTEMS.

FUEL SYSTEM PRESSURE RELEASE

Loosen retaining bolt on intake manifold sight shield at top of engine. Remove intake manifold sight shield from top of engine. Disconnect negative battery cable. Loosen fuel filler cap. Install Fuel Pressure Gauge (J-34730-1A) on fuel pressure connector of fuel rail. Wrap a shop towel around pressure connection when installing fuel pressure gauge to absorb fuel leakage. Place gauge bleed hose in container. Open bleed valve to release fuel pressure.

FUEL LINE DISCONNECT FITTINGS

Note. Fuel line disconnect fittings may contain metal or plastic collar. see scheme 27and see scheme 28. Determine type of disconnect fitting used and use proper procedure for type of disconnect fitting being serviced.

For removal and installation, see FUEL COMPOSITION SENSOR under SENSORS & SWITCHES.

1. Release fuel pressure. See «FUEL SYSTEM PRESSURE RELEASE»(ref-159266-S31486978192003112100000). Raise and support vehicle.
2. Before removal, clean fuel filter connections with a spray type engine cleaner, such as GM X-30A. DO NOT use any solvent that contains Methyl Ethyl Ketone (MEK). Solvents containing MEK may damage fuel system components.
3. Using a flare nut wrench and backup wrench, loosen the fuel lines from the fuel filter. (Scheme 40) Remove the fuel filter outlet line from the retainer and reposition the line out of the way.
4. Slide fuel filter from fuel filter bracket. Drain any remaining fuel into an approved container. Inspect fuel line "O" rings for cuts, nicks, swelling or distortion. Replace "O" rings as necessary.

Scheme 40

To install, reverse removal procedure. Tighten fuel line fittings to specification. See TORQUE SPECIFICATIONS . Turn ignition switch to ON position for 2 seconds. Turn ignition switch to OFF position for 10 seconds. Turn ignition switch to ON position. Check for fuel leaks. Repair as necessary.

FUEL TANK PRESSURE SENSOR

For removal and installation, see FUEL TANK PRESSURE SENSOR under SENSORS & SWITCHES.

See OXYGEN SENSORS under SENSORS & SWITCHES.

For removal and installation, see THROTTLE BODY under AIR INDUCTION SYSTEMS.

CAMSHAFT POSITION SENSOR

For removal and installation, see CAMSHAFT POSITION SENSOR under SENSORS & SWITCHES.

CRANKSHAFT POSITION SENSOR

For removal and installation, see CRANKSHAFT POSITION SENSOR under SENSORS & SWITCHES.

Note. Number in parenthesis refer to numbers in illustrations.

Note. There are 2 different manufacturers for the spark plug wire, ignition coils and coil brackets. They are as follows: The Melco® ignition coil is a square design (1). The Delphi® ignition coil is a round design (2). (Scheme 41)and (Scheme 42).

1. Turn ignition off. Disconnect negative battery cable. On 4.8L, 5.3L and 6.0L models, loosen retaining bolt on intake manifold sight shield at top of engine. see scheme 1 Remove intake manifold sight shield from top of engine.
2. On all models, remove spark plug wire(s) from appropriate ignition coil(s). Disconnect harness connector(s) from appropriate ignition coil(s). Remove retaining bolts from appropriate ignition coil(s). Remove ignition coil(s) from engine.
3. To install, reverse removal procedure. Tighten fasteners to specification. See «TORQUE SPECIFICATIONS»(ref-159266-S33064853322003112100000).

Scheme 41

Scheme 42

KNOCK SENSORS

For removal and installation, see KNOCK SENSORS under SENSORS & SWITCHES.

Remove the spark plug wire. See SPARK PLUG WIRES . Loosen the spark plug 1 or 2 turns. Brush or using compressed air, blow away any dirt from around the spark plug. Remove the spark plug. If removing more than one plug, place each plug in a tray marked with the corresponding cylinder number.

Correctly position the spark plug washer. Inspect the spark plug gap. Adjust the gap as needed. Spark plug gap should be 0.060" (1.524 mm). Hand start the spark plug in the corresponding cylinder. Tighten the spark plug to specification. See TORQUE SPECIFICATIONS . Install the spark plug wire.

Note. Number in parenthesis refer to numbers in illustrations.

Note. There are 2 different manufacturers for the spark plug wire, ignition coils and coil brackets. They are as follows: The Melco® spark plug wire will have a blue foil mark on it, and the wire is 5.70" (145 mm) in length from cable seal to cable seal (1). The Delphi® spark plug wire will have a white foil mark on it, and the wire is 4.30" (110 mm) in length cable seal to cable seal (2). (Scheme 43)

To remove the spark plug wire from the ignition coil and the spark plug, twist the spark plug wire boot a 1/2 turn. Pull only on the boot in order to remove the wire from the spark plug. To install, reverse removal procedure.

Scheme 43

EVAP CANISTER PURGE SOLENOID

For removal and installation, see EVAP CANISTER PURGE SOLENOID under SOLENOIDS.

EVAP CANISTER VENT VALVE

For removal and installation, see EVAP CANISTER VENT VALVE under SOLENOIDS.

Cleaning Procedure

1. Remove EVAP canister. See «EVAP CANISTER»(ref-159266-S28017555192003112100000) . Turn main valve to OFF position on EVAP Pressure/Purge Diagnostic Station. Disconnect hose from EVAP Pressure/Purge Diagnostic Station pressure regulator. Using a section of vacuum hose, connect one end to EVAP Pressure/Purge Diagnostic Station pressure regulator. Connect other end of vacuum hose to EVAP canister side of purge pipe.
2. Turn main nitrogen cylinder valve to ON and continue to discharge nitrogen for 15 seconds. If the nitrogen does not dislodge the carbon particles, replace the purge pipe. Replace EVAP canister. Continue with DTC test.