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Engine Control System & Fuel System - 3.6L - Repair Instructions: Other GMC Acadia I

Testing & Diagnostics ~716 words

Idle Learn Procedure

  1. Turn OFF the ignition for 30 seconds.
  2. Turn ON the ignition, with the engine OFF for 60 seconds.
  3. Turn OFF the ignition.
  4. Turn ON the ignition, with the engine OFF.
  5. Clear the DTCs with a scan tool.

Fuel Pressure Relief Procedure

  1. If the fuel system requires repair, prevent fuel spillage by removing the fuel pump fuse. Refer to «Electrical Center Identification Views»(ref-365306-S23234836492010070600000) .
  2. Remove the engine cover, if required.
  3. Loosen the fuel fill cap in order to relieve the fuel tank vapor pressure.
  4. Remove the fuel rail service port cap.
  5. Wrap a shop towel around the fuel rail service port.
  6. Connect the CH-48027-3 (4) to the fuel rail service port.
  7. Connect the CH-48027-2 (2) to the CH-48027-3 (4).
  8. Place the hose on the CH-48027-2 (2) into an approved gasoline container.
  9. Open the valve on the CH-48027-2 (2) in order to bleed any fuel from the fuel rail.
  10. Close the valve on the CH-48027-2 (2).
  11. Remove the hose on the CH-48027-2 (2) from the approved gasoline container.
  12. Disconnect the CH-48027-2 (2) from the CH-48027-3 (4).
  13. Disconnect the CH-48027-3 (4) from the fuel rail service port.
  14. Remove the shop towel from around the fuel rail service port, and place in an approved gasoline container.
  15. Install the fuel rail service port cap.
  16. Install the engine cover, if required.
  17. Tighten the fuel fill cap.

Fuel Pressure Relief (Without CH-48027)

WARNINGRefer to Gasoline/Gasoline Vapors Warning .
WARNINGRemove the fuel tank cap and relieve the fuel system pressure before servicing the fuel system in order to reduce the risk of personal injury. After you relieve the fuel system pressure, a small amount of fuel may be released when servicing the fuel lines, the fuel injection pump, or the connections. In order to reduce the risk of personal injury, cover the fuel system components with a shop towel before disconnection. This will catch any fuel that may leak out. Place the towel in an approved container when the disconnection is complete.
  1. If the fuel system requires repair, prevent fuel spillage by removing the fuel pump fuse. Refer to «Electrical Center Identification Views»(ref-365306-S23234836492010070600000) .
  2. Loosen the fuel fill cap in order to relieve the fuel tank vapor pressure.
  3. Remove the engine cover, if required.
  4. Remove the fuel rail service port cap.
  5. Wrap a shop towel around the fuel rail service port and using a small flat-bladed tool, depress (open) the fuel rail test port valve.
  6. Remove the shop towel from around the fuel rail service port, and place in an approved gasoline container.
  7. Install the fuel rail service port cap.
  8. Install the engine cover, if required.
  9. Tighten the fuel fill cap.

Fuel System Cleaning

IMPORTANTIf the fuel filter is plugged, the fuel tank should be inspected internally and cleaned if necessary.
  1. Remove the fuel tank module. Refer to «Fuel Tank Module Replacement»(ref-365256-S02744259222010070600000) .
  2. Inspect the fuel pump module strainer. Replace the pump module assembly if the fuel strainer is contaminated.
  3. Flush the fuel tank with hot water.
  4. Pour the water out of the fuel sender assembly opening in the fuel tank. Rock the fuel tank in order to be sure that the removal of the water from the fuel tank is complete.
  5. Allow the tank to dry completely before reassembly.
  6. Disconnect the fuel feed pipe at the engine fuel rail. Refer to «Metal Collar Quick Connect Fitting Service»(ref-365256-S06565574212010070600000) .
  7. Clean the fuel pipes by applying air pressure in the opposite direction of the fuel flow.
  8. Connect the fuel feed pipe to the engine fuel rail. Refer to «Metal Collar Quick Connect Fitting Service»(ref-365256-S06565574212010070600000) .
  9. Install the fuel tank module. Refer to «Fuel Tank Module Replacement»(ref-365256-S02744259222010070600000) .

Cleaning Procedure

  1. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(ref-365243-S07204316382010070600000) .
  2. Remove the EVAP canister. Refer to «Evaporative Emission Canister Replacement»(ref-365256-S26911396592010070600000) .
  3. Turn OFF the main valve on the J 41413 .
  4. Disconnect the hose from the diagnostic station pressure regulator.
  5. Using a section of vacuum hose, connect one end onto the EVAP pressure/purge diagnostic station pressure regulator.
  6. Connect the other end of the vacuum hose to the canister side of the purge pipe.
  7. Turn ON the main nitrogen cylinder valve and continue to discharge nitrogen for 15 seconds.
  8. If the nitrogen does not clear the blockage, replace the purge pipe.
  9. Return the EVAP pressure/purge diagnostic station to the stations original condition.
  10. Install a new EVAP canister. Refer to «Evaporative Emission Canister Replacement»(ref-365256-S26911396592010070600000) .
  11. Lower the vehicle.
  12. Install a new EVAP canister purge valve. Refer to «Evaporative Emission Canister Purge Solenoid Valve Replacement»(ref-365256-S32349561682010070600000) .
  13. Return to the diagnostic table that sent you here.

Spark Plug Usage

  1. Ensure that the correct spark plug is installed. An incorrect spark plug causes driveability conditions. Refer to «Ignition System Specifications»(ref-365318-S11731801562010070600000) for the correct spark plug.
  2. Ensure that the spark plug has the correct heat range. An incorrect heat range causes the following conditions: Spark plug fouling - Colder plug Pre-ignition causing spark plug and/or engine damage - Hotter plug

More articles — Engine Control System & Fuel System - 3.6L - Repair Instructions