Engine Controls/fuel - 2.4L - Repair Instructions: Other GMC Terrain I

Crankshaft Position System Variation Learn

Note. The Crankshaft Position Variation Learn procedure is also required when the following service procedures have been performed, regardless of whether DTC P0315 is set: An engine replacement An engine control module (ECM) or body control module (BCM) replacement A crankshaft balancer replacement A crankshaft removal and/or replacement A crankshaft position sensor disturbance/removal and/or replacement Any engine repairs which disturb the crankshaft to crankshaft position sensor relationship.

Note. The ECM monitors certain component signals to determine if all the conditions are met to continue with the Crankshaft Position Variation Learn procedure.

1. Ignition ON, observe the DTC information with a scan tool. Verify no other DTCs are set, except DTCs P0300-P0304, or P0315. If DTCs are set, except DTCs P0300-P0304, or P0315, refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(ref-491140-S28645929192012073000000) for further diagnosis.
2. Select the Crankshaft Position Variation Learn Procedure with a scan tool and perform the following: NOTE: Close the hood. NOTE: The engine must be at operating temperature. Block drive wheels. Set parking brake. DO NOT apply brake pedal. Turn the air conditioning (A/C) OFF. When directed, apply and hold brake pedal for the duration of the procedure. Ignition ON, engine running at operating temperature. The vehicle must remain in Park or Neutral. NOTE: While the learn procedure is in progress, release the throttle immediately when the engine starts to decelerate. The engine control is returned to the operator and the engine responds to throttle position after the learn procedure is complete. Accelerate to wide open throttle (WOT) and release when the fuel cut-off occurs.
3. The scan tool displays Learn In Progress.
4. The scan tool displays Learn Successful.
5. If not successful, review the reject reason's on the scan tool and repeat step's 1-3.
6. Verify DTC P0315 ran and passed This Ignition Cycle. If DTC P0315 failed or did not run This Ignition Cycle, or another DTC is present, refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(ref-491140-S28645929192012073000000) for the applicable DTC that set.
7. Once the Crankshaft Position Variation Learn procedure has successfully completed, and in order to store the crankshaft position variation values in the ECM, turn OFF the ignition and verify all vehicle systems are OFF. This may take up to 2 minutes.

Throttle Body Cleaning

Note. Over extended time and mileage, deposits may accumulate on the back of the throttle valve plate. The source of the deposit is exhaust gas recirculation (EGR) gas. Typically these deposits pose no problem. Occasionally the deposit may accumulate to a point where perceived pedal effort or throttle valve movement is effected. This procedure should not be performed on vehicles with mileage under 80 450 km (50, 000 mi).

1. Remove the air cleaner outlet duct resonator. Refer to «Air Cleaner Outlet Resonator Replacement»(ref-491198-S15915678162012073000000) .
2. Inspect the throttle body bore and the throttle valve plate for deposits. You will need to open the throttle valve in order to inspect all surfaces.
3. Clean the throttle body bore and the throttle valve plate using a clean shop towel with GM top engine cleaner, GM P/N 1052626 (Canadian P/N 993026) or ACDelco Carburetor Tune-Up Conditioner, P/N X66-P, or an equivalent product.
4. Install the air cleaner outlet duct resonator. Refer to «Air Cleaner Outlet Resonator Replacement»(ref-491198-S15915678162012073000000) .
5. Perform the Throttle/Idle Learn procedure. Refer to «Throttle/Idle Learn»(ref-491198-S31756319052012073000000) .

Fuel Pressure Relief

1. Disconnect the fuel tank wiring harness to the body wiring harness connector.
2. Start the vehicle and allow the engine to idle until the engine stops. The engine will stop in approximately 20-30 seconds.
3. Turn the ignition OFF.
4. Using a scan tool, verify that there is little to no fuel pressure, if there still is fuel pressure repeat step 2.

Metal Collar Quick Connect Fitting Service

Special Tools

EN-37088-A Fuel Line Disconnect Tool Set

For equivalent regional tools, refer to Special Tools .

Using The Fuel Pump

Using the fuel pump to drain the tank is the easiest procedure if the fuel pump is operable. The fuel can be pumped out with the vehicle on the ground or on a hoist.

On The Ground

1. Relieve the fuel system pressure. Refer to «Fuel Pressure Relief»(ref-491198-S23860166962012073000000) .
2. Disconnect the fuel feed quick connect fitting from the fuel rail. Refer «Metal Collar Quick Connect Fitting Service»(ref-491198-S30425081712012073000000) .
3. Install the 3/8 in. x 1/4 in fitting from the CH 48027 Digital Fuel Pressure Gauge into the fuel feed quick connect fitting.
4. Connect a suitable drain hose to the other end of the adapter and connect the drain hose to a certified fuel handling cart.
5. Connect a scan tool to the vehicle diagnostic connector and turn the ignition ON.
6. Energize the fuel pump using the scan tool.
7. Pump out the fuel until no more than 1/4 tank of fuel remains.

On The Hoist

1. Connect a scan tool to the vehicle diagnostic connector and turn the ignition ON.
2. Relieve the fuel system pressure. Refer to «Fuel Pressure Relief»(ref-491198-S23860166962012073000000) .
3. Raise the vehicle on a hoist to a comfortable working height, keeping the scan tool outside of the vehicle and accessible from under the car.
4. Disconnect the fuel tank fuel feed line quick connect fitting from the chassis fuel feed pipe. Refer «Plastic Collar Quick Connect Fitting Service»(ref-491198-S03222845352012073000000) .
5. Install the 3/8 in. x 1/4 in fitting from the CH 48027 Digital Fuel Pressure Gauge into the fuel feed quick connect fitting.
6. Connect a suitable drain hose to the other end of the adapter and connect the drain hose to a certified fuel handling cart.
7. Energize the fuel pump using the scan tool.
8. Pump out the fuel until no more than 1/4 tank of fuel remains.

Siphoning The Fuel Tank

If the fuel pump is inoperative, the tank can be drained by siphoning from the tank. A suitable means is through the fuel fill pipe with the correct type and stiffness of tubing as used with the CH 45004 Fuel Tank Drain Hose.

1. Disconnect the negative battery cable. Refer to «Battery Negative Cable Disconnection and Connection»(ref-491171-S06136050852012073000000) .
2. Open the fuel fill door and remove the gas cap.
3. Insert the siphon hose guide/funnel into the fuel fill pipe opening.
4. Insert the hose into the guide funnel and into the fuel fill pipe. Some resistance may be encountered when the tip of the siphon hose reaches the inlet check valve. Repeated probing may be necessary to slide the hose tip through the check valve cage.
5. Begin the fuel siphoning process. Place the fuel into an approved fuel container.
6. Remove the siphon hose from the fuel fill pipe after draining is complete.

Fuel System Cleaning

Special Tools

SA9127E-7 Fuel Pressure/Flow Adapter

After it is determined that the fuel system is contaminated, the following procedure to clean it is recommended.

1. Place the vehicle on a hoist and open the hood.
2. Disconnect the negative battery cable. Refer to «Battery Negative Cable Disconnection and Connection»(ref-491171-S06136050852012073000000) .
3. Remove the fuel tank. Refer to «Fuel Tank Replacement (AWD)»(ref-491198-S08323556402012073000000) , «Fuel Tank Replacement (FWD)»(ref-491198-S42031062462012073000000) .
4. Disconnect the fuel feed line at the fuel rail. Refer to «Metal Collar Quick Connect Fitting Service»(ref-491198-S30425081712012073000000) .
5. With compressed air, blow out the fuel feed. Catch the fuel in a container at the opposite end of the line.
6. Remove the fuel tank modules. Refer to «Fuel Tank Fuel Pump Module Replacement»(ref-491198-S41527592242012073000000) , and/or «Fuel Tank Fuel Pump Module Replacement - Secondary (With Out)»(ref-491198-S02698973362012073000000) .
7. Inspect the inlet filter on the primary pump. If plugged or damaged, the fuel pump module must be replaced.
8. Flush the tank with hot water for at least 6 minutes. Invert and drain. All metal chips/debris must be removed from the tank prior to installation.
9. Install the fuel pump modules to the fuel tank using a new fuel pump seal. Do not connect the fuel feed line to the new filter.
10. Install the fuel tank to the vehicle.
11. Connect the fuel line to the fuel rail. Refer to «Metal Collar Quick Connect Fitting Service»(ref-491198-S30425081712012073000000) .
12. Put at least 22.7 liters (6 gallons) of clean fuel into the fuel tank.
13. Connect the negative battery cable. Refer to «Battery Negative Cable Disconnection and Connection»(ref-491171-S06136050852012073000000) .
14. Connect a scan tool to the vehicle and turn the ignition ON.
15. Raise the vehicle on a hoist and install the male quick connect adapter SA9127E-7 fuel pressure/flow adapter into the fuel feed line.
16. Install the drain hose to the adapter and place the other end in an approved container.
17. Energize the fuel pump with the scan tool for 1-2 minutes. Refer to Energizing the Fuel Pump. This will pump about 1.9 liters (2 quarts) of fuel and purge any debris in the fuel pump.
18. Disconnect the fuel drain hose adapter at the fuel feed line and connect the fuel line to the fuel filter.
19. Energize the fuel pump and check all connections for leaks.
20. De-energize the pump, lower the vehicle, and start the engine.

Evaporative Emission System Cleaning

Special Tools

J 41413-200 Evaporative Emissions System Tester

For equivalent regional tools, refer to Special Tools .

Cleaning Procedure

1. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(ref-491131-S06536846302012073000000) .
2. Remove the EVAP canister. Refer to «Evaporative Emission Canister Replacement»(ref-491199-S05278807032012073000000) .
3. Turn OFF the main valve on the J 41413-200 tester.
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-491199-S05278807032012073000000) .
11. Lower the vehicle.
12. Install a new EVAP canister purge valve. Refer to «Evaporative Emission Canister Purge Solenoid Valve Replacement»(ref-491199-S07238671062012073000000) .
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 the Electronic Parts Catalog.
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