Engine Controls - 3.4l - Introduction (2 of 2) Chevrolet Equinox I

Temperature vs Resistance

Temperature vs Resistance

Altitude vs Barometric Pressure

Altitude vs Barometric Pressure

Ignition System Specifications

Ignition System Specifications

Fastener Tightening Specifications

Fastener Tightening Specifications

Action Taken When the DTC Sets - Type A

The control module illuminates the malfunction indicator lamp (MIL) when the diagnostic runs and fails.

Action Taken When the DTC Sets - Type B

The control module illuminates the MIL on the second consecutive ignition cycle that the diagnostic runs and fails.

Conditions for Clearing the MIL/DTC - Type A or Type B

1. The control module turns OFF the MIL after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
2. A current DTC Last Test Failed clears when the diagnostic runs and passes.
3. Use a scan tool in order to clear the MIL and the DTC.

Action Taken When the DTC Sets - Type C

1. The control module stores the DTC information into memory when the diagnostic runs and fails.
2. The MIL will not illuminate.
3. The driver information center, if equipped, may display a message.

Conditions for Clearing the DTC - Type C

1. A last test failed, or current DTC, clears when the diagnostic runs and passes.
2. Use a scan tool in order to clear the DTC.

Conditions for Clearing the DTC - Type X

This DTC is available in the PCM software, but has been disabled, or turned OFF. In this case, the diagnostic does not run, no DTCs are stored, and the MIL does not illuminate. Type X DTCs are used primarily for export vehicles that do not require MIL illumination or DTC storing.

Diagnostic Trouble Code (DTC) Type(s)

Diagnostic Trouble Code (DTC) Type(s)

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Engine Controls Schematic Icons

Engine Controls Schematic Icons Icon Icon Definition NOTE: The OBD II symbol is used on the circuit diagrams in order to alert the technician that the circuit is essential for proper OBD II emission control circuit operation. Any circuit which fails and causes the malfunction indicator lamp (MIL) to turn ON, or causes emissions-related component damage, is identified as an OBD II circuit. IMPORTANT: Twisted-pair wires provide an effective shield that helps protect sensitive electronic components from electrical interference. If the wires were covered with shielding, install new shielding. In order to prevent electrical interference from degrading the performance of the connected components, you must maintain the proper specification when making any repairs to the twisted-pair wires shown : The wires must be twisted a minimum of 9 turns per 31 cm (12 in) as measured anywhere along the length of the wires The outside diameter of the twisted wires must not exceed 6.0 mm (0.25 in)

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Powertrain Control Module (PCM) Connector End Views

Powertrain Control Module (PCM) C1 Connector Part Information OEM: 15450304 Service: 88988487 56-Way F (BU) Pin Wire Color Circuit No. Function 1 TN/BK 2500 High Speed GMLAN Serial Data (+) 2 TN 2501 High Speed GMLAN Serial Data (-) 3 - - Not Used 4 GY 2700 5-Volt Reference 5 - - Not Used 6 BN/WH 419 MIL Control 7 TN 5514 Low Reference 8-9 - - Not Used 10 WH 1310 EVAP Canister Vent Solenoid Control 11 - - Not Used 12 TN 2759 Low Reference 13-17 - - Not Used 18 YE 743 Accessory Voltage 19 PK 639 Ignition 1 Voltage 20 RD/WH 1440 Battery Positive Voltage 21 - - Not Used 22 BN 818 VSS Signal 23 YE 447 Starter Relay Coil Control 24 BN 5069 Engine Main Relay Coil Control 25 - - Not Used 26 D-GN 890 Fuel Tank Pressure Sensor Signal 27-30 - - Not Used 31 OG/BK 380 A/C Refrigerant Pressure Sensor Signal 32 L-BU 20 Stop Lamp Supply Voltage 33 D-GN/WH 459 A/C Compressor Clutch Relay Control 34-36 - - Not Used 37 D-GN/WH 465 Fuel Pump Primary Relay Control 38 OG/BK 1786 Transmission Park/Neutral Signal 39-42 - - Not Used 43 PU 1589 Primary Fuel Level Sensor Signal 44 GY 1884 Cruise Control Set/Coast/Resume/Accelerate Switch Signal 45 - - Not Used 46 PU 420 Torque Converter Clutch Brake Switch Signal 47 - - Not Used 48 D-GN 335 Low Speed Cooling Fan Relay Control 49 - - Not Used 50 D-BU 473 High Speed Cooling Fan Relay Control 51-52 - - Not Used 53 GY 2709 Fuel Tank Pressure Sensor 5-Volt Reference 54-56 - - Not Used

Powertrain Control Module (PCM) C2 Connector Part Information OEM: 15450306 Service: 88988489 73-Way F (BK) Pin Wire Color Circuit No. Function 1 BN 1456 Exhaust Gas Recirculation Valve Position Signal 2 TN 800 UART Serial Data 1 3 OG/BK 1061 UART Serial Data 2 4 PK/BK 1746 Fuel Injector Control 3 5 TN 1744 Fuel Injector Control 1 6 L-GN/BK 1745 Fuel Injector Control 2 7 TN/WH 845 Fuel Injector Control 5 8 TN 2753 Exhaust Gas Recirculation Sensor Low Reference 9 YE/BK 846 Fuel Injector Control 6 10 L-BU/BK 844 Fuel Injector Control 4 11 OG/WH 2122 IC 2 Control 12 GY/WH 3113 Heated Oxygen Sensor Heater Low Control Bank 1 Sensor 1 13 OG 1676 Exhaust Gas Recirculation Solenoid Supply Voltage 14 - - Not Used 15 PU 574 Low Reference 16 GY 435 Exhaust Gas Recirculation Solenoid Control 17 - - Not Used 18 L-GN 432 Manifold Absolute Pressure Sensor Signal 19-20 - - Not Used 21 OG 631 Camshaft Sensor 12-Volt Reference 22 L-GN 1867 Crankshaft Position Sensor 12-Volt Reference 23-25 - - Not Used 26 BN/WH 633 Camshaft Position Sensor Signal 27 L-BU/BK 647 Medium Resolution Engine Speed Signal 28-29 - - Not Used 30 OG/BK 469 Manifold Absolute Pressure Sensor Low Reference 31 - - Not Used 32 PK/BK 632 Camshaft Position Sensor Low Reference 33 GY 5047 Exhaust Gas Recirculation 5-Volt Reference 34 GY 2704 5-Volt Reference 35 - - Not Used 36 GY 2303 Knock Sensor Low Reference 2 37 YE 2174 Ignition Control Timing Low Reference 1 38 D-BU 496 Knock Sensor Signal 1 39 BK/WH 1251 Ground 40 GY 1716 Knock Sensor Low Reference 1 41 D-GN/WH 428 EVAP Canister Purge Solenoid Control 42-46 - - Not Used 47 TN/WH 1653 HO2S 1 Low Signal 48 PU/WH 1665 HO2S 1 High Signal 49-52 - - Not Used 53 OG 225 Generator Turn On Signal 54 L-BU 1876 Knock Sensor Signal 2 55 YE 410 Engine Coolant Temperature Sensor Signal 56 BK/WH 1351 Ground 57 TN/BK 231 Oil Pressure Switch Signal 58-60 - - Not Used 61 PU 2121 IC 1 Control 62 - - Not Used 63 L-BU 2123 Ignition Control 3 64-72 - - Not Used 73 BK/WH 451 Ground

Powertrain Control Module (PCM) C3 Connector Part Information OEM: 15450305 Service: 88988488 56-Way F (L-GY) Pin Wire Color Circuit No. Function 1-3 - - Not Used 4 TN/WH 1669 HO2S 2 Low Signal 5 - - Not Used 6 YE 492 Mass Air Flow Sensor Signal 7 - - Not Used 8 GY/WH 3122 HO2S 2 Heater Low Control 9-18 - - Not Used 19 PU/WH 1668 HO2S 2 High Signal 20-25 - - Not Used 26 TN 472 Intake Air Temperature Sensor Signal 27-49 - - Not Used 50 TN 2760 Intake Air Temperature Sensor Low Reference 51-56 - - Not Used

Engine Controls Connector End Views

Accelerator Pedal Position (APP) Sensor Connector Part Information OEM: 15326829 Service: 88953153 6-Way F 150 Sealed Series (BK) Pin Wire Color Circuit No. Function A PU 1272 Low Reference B L-BU 1162 APP Sensor 2 Signal C TN 1274 5-Volt Reference - B D BN 1271 Low Reference E D-BU 1161 APP Sensor 1 Signal F WH/BK 1164 5-Volt Reference - A

Camshaft Position (CMP) Sensor Connector Part Information OEM: 15336065 Service: 15306315 3-Way F GT 150 Series Sealed (BK) Pin Wire Color Circuit No. Function A BN/WH 633 CMP Sensor Signal B BK 632 Low Reference C RD/WH 631 12-Volt Reference

Crankshaft Position (CKP) Sensor Connector Part Information OEM: 15326808 Service: 15306388 3-Way F GT 150 Sealed 4.5 (BK) Pin Wire Color Circuit No. Function A L-GN 1867 12-Volt Reference B PU 574 Low Reference C L-BU/BK 647 Medium Resolution Engine Speed Signal

Engine Coolant Temperature (ECT) Sensor Connector Part Information OEM: 12162194 Service: 88987978 2-Way F Metri-Pack 150.2 Series, Sealed, Pull To Seat (BK) Pin Wire Color Circuit No. Function A OG/BK 469 Low Reference B YE 410 ECT Sensor Signal

Evaporative Emissions (EVAP) Canister Purge Solenoid Connector Part Information OEM: 12052643 Service: 12101858 2-Way F Metri-Pack 150 Series, Sealed (RD) Pin Wire Color Circuit No. Function A PK/BK 5291 Ignition 1 Voltage B D-GN/WH 428 EVAP Canister Purge Solenoid Control

Evaporative Emissions (EVAP) Canister Vent Solenoid Connector Part Information OEM: 12052643 Service: 12101858 2-Way F Metri-Pack Sealed Series (RD) Pin Wire Color Circuit No. Function A PK 1440 Battery Positive Voltage B WH 1310 EVAP Canister Vent Solenoid Control

Exhaust Gas Recirculation (EGR) Valve Connector Part Information OEM: 12186056 Service: 12126477 5-Way F Metri-Pack 150.2 Pull To Seat Sealed Series (BK) Pin Wire Color Circuit No. Function A GY 435 Exhaust Gas Recirculation Solenoid Low Control B TN 2753 Low Reference C BN 1456 Exhaust Gas Recirculation Valve Position Signal D GY 5047 5-Volt Reference E OG 1676 Exhaust Gas Recirculation Solenoid High Control

Fuel Tank Pressure (FTP) Sensor Connector Part Information OEM: 12059595 Service: 88986451 3-Way F 150 Sealed Series (BK) Pin Wire Color Circuit No. Function A BK 2759 Low Reference B D-GN 890 FTP Sensor Signal C GY 2709 5-Volt Reference - A

Fuel Injector 1 Connector Part Information OEM: 15355226 Service: 89046636 2-Way F Metri-Pack 150 Tangless Series Sealed (BK) Pin Wire Color Circuit No. Function A PK 5292 Ignition 1 Voltage B BK 1744 Fuel Injector 1 Control

Fuel Injector 2 Connector Part Information OEM: 15355226 Service: 89046636 2-Way F Metri-Pack 150 Tangless Series Sealed (BK) Pin Wire Color Circuit No. Function A PK 5292 Ignition 1 Voltage B L-GN/BK 1745 Fuel Injector 2 Control

Fuel Injector 3 Connector Part Information OEM: 15355226 Service: 89046636 2-Way F Metri-Pack 150 Tangless Series Sealed (BK) Pin Wire Color Circuit No. Function A PK 5292 Ignition 1 Voltage B PK/BK 1746 Fuel Injector 3 Control

Fuel Injector 4 Connector Part Information OEM: 15355226 Service: 89046636 2-Way F Metri-Pack 150 Tangless Series Sealed (BK) Pin Wire Color Circuit No. Function A PK 5292 Ignition 1 Voltage B L-BU/BK 844 Fuel Injector 4 Control

Fuel Injector 5 Connector Part Information OEM: 15355226 Service: 89046636 2-Way F Metri-Pack 150 Tangless Series Sealed (BK) Pin Wire Color Circuit No. Function A PK 5292 Ignition 1 Voltage B BK/WH 845 Fuel Injector 5 Control

Fuel Injector 6 Connector Part Information OEM: 15355226 Service: 89046636 2-Way F Metri-Pack 150 Tangless Series Sealed (BK) Pin Wire Color Circuit No. Function A PK 5292 Ignition 1 Voltage B YE/BK 846 Fuel Injector 6 Control

Heated Oxygen Sensor (HO2S) 1 Connector Part Information OEM: 12176897 Service: 15305960 4-Way F Metri-Pack 150 Sealed (GY) Pin Wire Color Circuit No. Function A TN/WH 1653 HO2S 1 Low Signal B PU/WH 1665 HO2 1 High Signal C GY/WH 3113 HO2S 1 Heater Low Control D PK/BK 5291 Ignition 1 Voltage

Heated Oxygen Sensor (HO2S) 2 Connector Part Information OEM: 15326423 Service: 15306319 4-Way M Metri-Pack 150 Sealed (GY) Pin Wire Color Circuit No. Function A TN/WH 1669 HO2S 2 Low Signal B PU/WH 1668 HO2S 2 High Signal C GY/WH 3122 HO2S 2 Heater Low Control D PK/BK 5291 Ignition 1 Voltage

Ignition Control Module (ICM) Connector Part Information OEM: 15326829 Service: 88953153 6-Way F 150 Sealed (BK) Pin Wire Color Circuit No. Function A OG/WH 2122 IC 2 Control B PU 2121 IC 1 Control C L-BU 2123 IC 3 Control D YE 2174 Low Reference E BK 450 Ground F PK 39 Ignition 1 Voltage

Knock Sensor (KS) 1 Connector Part Information OEM: 15374222 Service: See Catalog 2-Way F GT 150 SLD (NA) Pin Wire Color Circuit No. Function A D-BU 496 Knock Sensor 1 Signal B GY 1716 Knock Sensor 1 Low Reference

Knock Sensor (KS) 2 Connector Part Information OEM: 15374222 Service: See Catalog 2-Way F GT 150 SLD (NA) Pin Wire Color Circuit No. Function A L-BU 1876 Knock Sensor 2 Signal B GY 2303 Knock Sensor 2 Low Reference

Mass Air Flow (MAF)/Intake Air Temperature (IAT) Sensor Connector Part Information OEM: 15326822 Service: 15326822 5-Way F GT 150 Sealed 4.0 (BK) Pin Wire Color Circuit No. Function A YE 492 Mass Air Flow Sensor Signal B PK/BK 5291 Ignition 1 Voltage C BK/WH 451 Ground D TN 472 Intake Air Temperature Sensor Signal E TN 2760 Low Reference

Manifold Absolute Pressure (MAP) Sensor Connector Part Information OEM: 12129946 Service: 88987997 3-Way F Metri-Pack 150 Series, Sealed (GY) Pin Wire Color Circuit No. Function A OG/BK 469 Low Reference B L-GN 432 MAP Sensor Signal C GY 2704 5-Volt Reference - B

Throttle Actuator Control (TAC) Module Connector Part Information OEM: 15355368 Service: 15355368 20-Way F GT 150 Series SLD (GY) Pin Wire Color Circuit No. Function 1 TN 1274 5-Volt Reference - B 2 PU 1272 Low Reference 3 L-BU 1162 APP Sensor 2 Signal 4 BN 818 VSS Signal 5 - - Not Used 6 L-BU 20 Stop Lamp Switch Signal 7 OG/BK 1061 UART Serial Data 2 8 BK/WH 451 Ground 9-10 - - Not Used 11 D-BU 1161 APP Sensor 1 Signal 12 BN 1271 Low Reference 13 WH/BK 1164 5-Volt Reference - A 14-15 - - Not Used 16 TN 800 UART Serial Data 1 17 BK/WH 451 Ground 18 PK/BK 5290 Ignition 1 Voltage 19-20 - - Not Used

DIAGNOSTIC CODE INDEX

DIAGNOSTIC CODE INDEX

Removal Procedure

1. Using a scan tool, retrieve the percentage of remaining engine oil and the remaining automatic transmission fluid life. Record the remaining engine oil and the remaining automatic transmission fluid life.
2. Remove the powertrain control module (PCM) (1) and PCM bracket (2) from the battery box cover.
3. Remove the PCM bracket (2) from the PCM (1).
4. Disconnect the PCM wire harness (4) from the battery box cover.
5. Disconnect the negative battery cable. Refer to «Battery Negative Cable Disconnect/Connect Procedure»(/chevrolet/equinox/i-2004-2009/remont/charging-system/#battery-charging-system-and-starting-system) in Engine Electrical.
6. Remove the PCM connectors (2) from the PCM (3).
7. Remove the PCM (3) from the vehicle.

Installation Procedure

1. Install the PCM (3) to the vehicle.
2. Install the PCM connectors (2) to the PCM (3).
3. Connect the negative battery cable. Refer to «Battery Negative Cable Disconnect/Connect Procedure»(/chevrolet/equinox/i-2004-2009/remont/charging-system/#battery-charging-system-and-starting-system) in Engine Electrical.
4. Connect the PCM wire harness (4) to the battery box cover.
5. Install the PCM bracket (2) to the PCM (1).
6. Install the PCM bracket (1) to the battery box cover.
7. Reprogram the PCM. Refer to «Control Module References»(/chevrolet/equinox/i-2004-2009/remont/communication-devices/#computerintegrating-systems__control-module-references) in Computer/Integrating Systems.

CKP System Variation Learn Procedure

1. Install a scan tool.
2. Monitor the PCM for DTCs with a scan tool. If other DTCs are set, except DTC P0315, refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/chevrolet/equinox/i-2004-2009/remont/oem-general-information/#vehicle-dtc-information__diagnostic-trouble-code-dtc-list) for the applicable DTC.
3. With a scan tool, select the CKP variation learn procedure and perform the following: Observe fuel cut-off for applicable engine. Block drive wheels. Set parking brake. DO NOT apply brake pedal. Cycle ignition from OFF to ON. Apply and hold brake pedal for the duration of the procedure. Start and idle engine. Turn the air conditioning (A/C) OFF. The vehicle must remain in Park or Neutral. IMPORTANT: The engine should not accelerate beyond the calibrated fuel cut-off RPM value noted in step 3.1. Release the throttle immediately if the value is exceeded. IMPORTANT: 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).
4. The scan tool displays Learn Status: Learned this ignition. If the scan tool indicates that DTC P0315 ran and passed, the CKP variation learn procedure is complete. If the scan tool indicates DTC P0315 failed or did not run, refer to «DTC P0315»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-dtc-p0220-to-dtc-p0455) . If any other DTCs set, refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/chevrolet/equinox/i-2004-2009/remont/oem-general-information/#vehicle-dtc-information__diagnostic-trouble-code-dtc-list) for the applicable DTC.
5. Turn OFF the ignition for 30 seconds after the learn procedure is completed successfully in order to store the CKP system variation values in the PCM memory.

1. Engine coolant must be drained below the level of the engine coolant temperature (ECT) sensor. Refer to «Draining and Filling Cooling System (Static Fill)»(/chevrolet/equinox/i-2004-2009/remont/cooling-system-mechanical/#engine-cooling-system) or «Draining and Filling Cooling System (GE 47716 Fill)»(/chevrolet/equinox/i-2004-2009/remont/cooling-system-mechanical/#engine-cooling-system) in Engine Cooling.
2. Disconnect the ECT sensor harness connector.
3. Remove the ECT sensor.

1. Apply thread sealant GM P/N 12345382 (Canadian P/N 10953489) or equivalent, to sensor threads.
2. Install the ECT sensor. Tighten: Tighten the engine coolant temperature sensor to 23 N.m (17 lb ft).
3. Connect the ECT sensor harness connector. Push in the connector until a click is heard, then pull back to confirm a positive engagement.
4. Fill engine coolant to proper level. Refer to «Draining and Filling Cooling System (Static Fill)»(/chevrolet/equinox/i-2004-2009/remont/cooling-system-mechanical/#engine-cooling-system) or «Draining and Filling Cooling System (GE 47716 Fill)»(/chevrolet/equinox/i-2004-2009/remont/cooling-system-mechanical/#engine-cooling-system) in Engine Cooling.

1. Remove the air cleaner intake duct. Refer to «Air Cleaner Intake Duct Replacement»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2) .
2. Disconnect the mass air flow (MAF) sensor electrical connector.
3. Remove the screws that retain the MAF to the air cleaner assembly.
4. Remove the MAF from the air cleaner assembly.
5. Remove the MAF to air cleaner assembly seal.

1. Install the seal to the MAF.
2. Install the MAF to the air cleaner assembly.
3. Install the screws that retain the MAF to the air cleaner assembly. Tighten: Tighten the screws to 4 N.m (35 lb in).

1. Disconnect the manifold absolute pressure (MAP) sensor electrical connector.
2. Remove the MAP sensor retaining bolt (3) and bracket (2).
3. Remove the MAP sensor (1) and the MAP sensor port seal if it is still retained in the intake manifold.

1. Install the MAP sensor (1) to the intake manifold.
2. Install the MAP sensor retaining bracket (2) and bolt (3). Tighten: Tighten the bolt to 10 N.m (89 lb in).
3. Connect the MAP sensor electrical connector.

1. Disconnect the HO2S 1 harness connector.
2. Remove the HO2S 1 from the exhaust manifold.

1. Apply a small amount of anti-seize compound to the threads of the HO2S 2.
2. Install the HO2S 1 to the exhaust manifold. Tighten: Tighten the HO2S 1 to 42 N.m (31 lb ft).
3. Connect the HO2S 1 harness connector. Push in the connector until a click is heard and pull back to confirm a positive engagement.

1. Raise the vehicle. Refer to «Lifting and Jacking the Vehicle»(/chevrolet/equinox/i-2004-2009/remont/hoistjack/#general-information) in General Information.
2. Disconnect the HO2S 2 harness connector (3).
3. Use a liquid penetrate before removing the sensor.
4. Remove the HO2S 2 (2) from the exhaust pipe.

1. Apply a small amount of anti-seize compound to the threads of the HO2S 2.
2. Install the HO2S 2 (2). Tighten: Tighten the HO2S 2 to 42 N.m (31 lb ft).
3. Connect the HO2S 2 harness connector (3). Push in the connector until a click is heard, then pull back to confirm a positive engagement.
4. Ensure the HO2S 2 harness pigtail connector is secure to the chassis.

1. Remove the instrument panel left lower closeout panel. Refer to «Closeout/Insulator Panel Replacement - Left»(/chevrolet/equinox/i-2004-2009/remont/gauges-instrument-panels/#instrument-panel-gages-and-console) in Instrument Panel, Gages, and Console.
2. Remove the connector position assurance (CPA) from the accelerator pedal position (APP) sensor connector.
3. Disconnect the APP sensor harness connector.
4. Remove the APP assembly attachment bolts.
5. Remove the APP assembly from the vehicle.

1. Install the upper attachment bolt into the APP assembly.
2. Install the APP assembly into the vehicle.
3. Install the remaining attachment bolts into the APP assembly. Tighten: Tighten the bolts to 25 N.m (18 lb ft).
4. Connect the APP sensor harness connector. Push the connector in until the lock position is felt, then pull back to confirm engagement.
5. Install the CPA to the APP sensor harness connector.
6. Install the instrument panel left lower closeout panel. Refer to «Closeout/Insulator Panel Replacement - Left»(/chevrolet/equinox/i-2004-2009/remont/gauges-instrument-panels/#instrument-panel-gages-and-console) in Instrument Panel, Gages, and Console.

1. Remove the air cleaner intake duct. Refer to «Air Cleaner Intake Duct Replacement»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2) .
2. Remove the heater outlet pipe. Refer to «Heater Pipe Replacement - Outlet»(/chevrolet/equinox/i-2004-2009/remont/cooling-system-mechanical/#engine-cooling-system) in Engine Cooling.
3. Cover the throttle body opening with a shop towel and use the shop air to remove any dirt at the base of the throttle body.
4. Disconnect the TAC module electrical connector (1) by pulling up on the connector lock (2) to release the connector from the TAC module (3).
5. Remove the throttle body bolts (2).
6. Remove the throttle body (1) from the intake manifold
7. Block the intake manifold opening with a clean shop towel to prevent dirt from entering.
8. Remove the throttle body studs ONLY If replacement of stud is necessary.

1. Install the throttle body studs if previously removed. Tighten: Tighten the throttle body stud to 6 N.m (53 lb in).
2. Install the throttle body (1) to the intake manifold
3. Install the throttle body bolts. Tighten: Tighten the throttle body-to-intake manifold bolts to 10N.m (89 lb in).
4. Connect the TAC module electrical connector (1) to the TAC module (3) then press down the connector lock (2) in order to secure the TAC module electrical connector.
5. Install the heater outlet pipe. Refer to «Heater Pipe Replacement - Outlet»(/chevrolet/equinox/i-2004-2009/remont/cooling-system-mechanical/#engine-cooling-system) in Engine Cooling.
6. Install the air cleaner intake duct. Refer to «Air Cleaner Intake Duct Replacement»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2) .

Throttle Body Cleaning Procedure

1. Remove the air intake duct. Refer to «Air Cleaner Intake Duct Replacement»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2) . CAUTION: Turn OFF the ignition before inserting fingers into the throttle bore. Unexpected movement of the throttle blade could cause personal injury. NOTE: Do not insert any tools into the throttle body bore in order to avoid damage to the throttle valve plate.
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. NOTE: Do not use any solvent that contains Methyl Ethyl Ketone (MEK). This solvent may damage fuel system components.
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 AC-Delco Carburetor Tune-Up Conditioner, P/N X66-P, or an equivalent product.
4. Install the air intake duct. Refer to «Air Cleaner Intake Duct Replacement»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2) .

Tools Required

J 34730-1A Fuel Pressure Gage. See Special Tools .

1. Disconnect the negative battery cable. Refer to «Battery Negative Cable Disconnect/Connect Procedure»(/chevrolet/equinox/i-2004-2009/remont/charging-system/#battery-charging-system-and-starting-system) in Engine Electrical.
2. Connect the J 34730-1A to the fuel pressure connection. See «Special Tools»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2__special-tools) . Refer to «Fuel Pressure Gage Installation and Removal»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2) .
3. Install the bleed hose into an approved container and open the valve to bleed the system pressure. The fuel connections are now safe for servicing.
4. Disconnect the fuel pressure gage from the fuel pressure connection. Refer to «Fuel Pressure Gage Installation and Removal»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2) .

J 34730-1A Fuel Pressure Gage. See Special Tools .

Note. Clean all of the following areas before performing any disconnections in order to avoid possible contamination in the system: The fuel pipe connections The hose connections The areas surrounding the connections

1. Install the J 34730-1A to the fuel pressure connection, located on the fuel rail. See «Special Tools»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2__special-tools) .
2. Place the bleed hose of the fuel pressure gage into an approved gasoline container.
3. Open the bleed valve on the fuel pressure gage in order to bleed the air from the gage.
4. Turn ON the ignition, with the engine OFF.
5. Command the fuel pump ON with a scan tool until all of the air is bled out of the gage.
6. Close the bleed valve on the fuel pressure gage.
7. Command the fuel pump ON with a scan tool.
8. Inspect for fuel leaks.

1. Place the fuel pressure gage bleed hose into an approved container and open the bleed valve to bleed fuel system pressure.
2. Place a shop towel under the fuel pressure gage to catch any remaining fuel spillage.
3. Remove the J 34730-1A from fuel pressure connection. See «Special Tools»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2__special-tools) .
4. Drain any fuel remaining in the fuel pressure gage into an approved container.
5. Install the cap on the fuel pressure connection.
6. Place the shop towel in an approved container.

J 37088-A Fuel Line Disconnect Tool Set

1. Relieve the fuel system pressure before servicing any fuel system connection. Refer to the «Fuel Pressure Relief Procedure»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2) .
2. Remove the retainer from the quick-connect fitting.
3. Blow dirt out of the fitting using compressed air.
4. Choose the correct tool from the J 37088-A for the size of the fitting. Insert the tool into the female connector, then push inward in order to release the locking tabs.
5. Pull the connection apart.
6. Use a clean shop towel in order to wipe off the male pipe end.
7. Inspect both ends of the fitting for dirt and burrs. Clean or replace the components as required.

1. Apply a few drops of clean engine oil to the male pipe end.
2. Push both sides of the fitting together in order to snap the retaining tabs into place.
3. Once installed, pull on both sides of the fitting in order to make sure the connection is secure.
4. Install the retainer to the quick-connect fitting.

Scheme 26

1. Relieve the fuel system pressure before servicing any fuel system connection. Refer to the «Fuel Pressure Relief Procedure»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2) .
2. Using compressed air, blow any dirt out of the quick-connect fitting.
3. This step applies to Bartholomew style connectors ONLY. Squeeze the plastic quick connect fitting release tabs.
4. This step applies to Q Release style connectors ONLY. Release the fitting by Pushing the tab toward the other side of the slot in the fitting.
5. This step applies to Squeeze to Release style connectors ONLY. Squeeze where indicated by arrows on both sides of the plastic ring surrounding the quick connect fitting.
6. This step applies to Sliding Retainer style connectors ONLY. Release the fitting by pressing on one side of the release tab causing it to push in slightly. If the tab doesn't move try pressing the tab in from the opposite side. The tab will only move in one direction
7. Pull the connection apart.

1. Apply a few drops of clean engine oil to the male connection end.
2. Push both sides of the quick-connect fitting together in order to cause the retaining feature to snap into place.
3. Once installed, pull on both sides of the quick-connect fitting in order to make sure the connection is secure.

Fuel Tank Draining Procedure

Tools Required

1. J 34730-262 Fuel Pressure/Test Gage Adapter. See «Special Tools»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2__special-tools) .
2. J 42960-2 Fuel Flapper Door Holder. See «Special Tools»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2__special-tools) .
3. J 45004 Fuel Tank Drain Hose. See «Special Tools»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2__special-tools) .

For any operation requiring removal of the fuel tank, there should be no more than 11.4 L (3 gal) of fuel remaining. This minimizes the weight of the assembly and eases handling. The fuel level can be determined by reading the fuel level gage. A reading below 1/4 full indicates that no more than 11.4 L (3 gal) are remaining.

Using The Fuel Pump

Scheme 27

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

On The Ground

1. Relieve the fuel system pressure. Refer to «Fuel Pressure Relief Procedure»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2) .
2. Disconnect the fuel feed line at the fuel rail and install the 3/8 x 1/4 in quick connect from the J 34730-262 into the fuel feed line. See «Special Tools»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2__special-tools) .
3. Connect a suitable drain hose to the other end of the adapter and connect the drain hose into a certified fuel handling cart.
4. Connect the scan tool to the vehicle and turn the ignition ON.
5. Energize the fuel pump using the scan tool. Refer to «Fuel Pump Electrical Circuit Diagnosis»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-troubleshooting-diagnosis) .
6. Pump out the fuel until no more than 1/4 tank remains.

On The Hoist

1. Connect the scan tool to the vehicle diagnostic connector and turn the ignition ON.
2. Relieve the fuel system pressure. Refer to «Fuel Pressure Relief Procedure»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2) .
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 chassis fuel feed line at the fuel tank.
5. Install the 3/8 x 1/4 in quick connect (1) adapter from the J 34730-262 onto the fuel feed line. See «Special Tools»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2__special-tools) .
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. Refer to «Fuel Pump Electrical Circuit Diagnosis»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-troubleshooting-diagnosis) .
8. Pump out the fuel until no more than 1/4 tank 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 filler pipe with the correct type and stiffness of tubing as used with the J 45004 . See Special Tools .

1. Disconnect the negative battery cable.
2. Open the fuel filler door and remove the gas cap.
3. Insert the J 42960-2 into the fuel filler pipe. See «Special Tools»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2__special-tools) .
4. Insert the J 45004 into the guide funnel and into the fuel filler pipe. See «Special Tools»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2__special-tools) . 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 and the fuel flapper door holder from the fuel filler pipe after draining is complete.

J 45722 Fuel Sender Lock Ring Wrench. See Special Tools .

1. Remove the fuel tank. Refer to «Fuel Tank Replacement (FWD)»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2) or «Fuel Tank Replacement (AWD)»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2) .
2. Remove the secondary fuel pump module. Refer to «Fuel Tank Module Replacement - Secondary»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2) .
3. Disconnect the electrical connectors from the primary fuel pump module and fuel tank pressure sensor.
4. Use the J 45722 and a long breaker-bar in order to unlock the fuel sender lock ring. See «Special Tools»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2__special-tools) . Turn the fuel sender lock ring in a counterclockwise direction.
5. Disconnect the fuel feed and vent lines from the fuel tank. NOTE: To prevent bending of the sending unit float arm during removal, lift the pump module up slightly to disengage the orientation tabs in the tank and rotate the module 45 degrees.
6. Remove the primary fuel pump module assembly.
7. Discard the fuel pump module-to-tank seal.
8. If the fuel level sending unit is being replaced, remove the fuel level sender. Refer to «Fuel Level Sensor Replacement - Primary»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2) .
9. Place the lock ring on a flat surface. Measure the clearance between to lock ring and the flat surface using a feeler gage at 7 points.
10. If the warpage is less than 0.41 mm (0.016 in), the lock ring does not require replacement.
11. If the warpage is greater than 0.41 mm (0.016 in), the lock ring must be replaced.

1. If the fuel level sending unit is being replaced, install the fuel level sending unit onto the new fuel pump. Refer to «Fuel Level Sensor Replacement - Primary»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2) .
2. Insert the new primary fuel pump module assembly with the level sender and the new fuel pump-to-tank seal. Ensure the orientation tabs are aligned.
3. Use the J 45722 in order to install the fuel sender lock ring. See «Special Tools»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2__special-tools) . Turn the fuel sender lock ring in a clockwise direction.
4. Connect the wiring harness to the primary fuel pump module and fuel tank pressure sensor.
5. Install the secondary fuel pump module. Refer to «Fuel Tank Module Replacement - Secondary»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2) .
6. Install the fuel tank. Refer to «Fuel Tank Replacement (FWD)»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2) or «Fuel Tank Replacement (AWD)»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2) .

J39765-A Fuel Sender Lock Ring Tool. See Special Tools .

1. Remove the fuel tank. Refer to «Fuel Tank Replacement (FWD)»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2) or «Fuel Tank Replacement (AWD)»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2) .
2. Disconnect the EVAP vent line quick connect.
3. Use the J39765-A and remove the fuel pump module retaining ring. See «Special Tools»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2__special-tools) .
4. Disconnect the secondary level sensor electrical connector.
5. Disconnect the suction port attaching tube by pressing down on the tab (1).
6. Remove the secondary fuel pump module.
7. Discard the fuel pump module-to-tank seal.
8. If the fuel level sending unit is being replaced as well, remove the fuel level sender. Refer to «Fuel Level Sensor Replacement - Secondary»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2) .

1. If the fuel level sending unit is being replaced, install the fuel level sending unit into the new fuel pump. Refer to «Fuel Level Sensor Replacement - Secondary»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2) .
2. Connect the suction port (1).
3. Insert the new secondary fuel pump module with the level sender and new fuel pump-to-tank seal. Ensure the orientation tabs are aligned.
4. Use the J39765-A to install the fuel pump lock ring. See «Special Tools»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2__special-tools) .
5. Connect the EVAP line quick connect.
6. Install the fuel tank. Refer to «Fuel Tank Replacement (FWD)»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2) or «Fuel Tank Replacement (AWD)»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2) .

1. Ensure that the fuel level in the tank is less than 1/4 full. If necessary, drain the fuel tank to at least this level. Refer to «Fuel Tank Draining Procedure»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2__fuel-tank-draining-procedure) .
2. Relieve the fuel system pressure. Refer to «Fuel Pressure Relief Procedure»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2) .
3. Disconnect the negative battery cable. Refer to «Battery Negative Cable Disconnect/Connect Procedure»(/chevrolet/equinox/i-2004-2009/remont/charging-system/#battery-charging-system-and-starting-system) in Engine Electrical.
4. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/chevrolet/equinox/i-2004-2009/remont/hoistjack/#general-information) in General Information.
5. Remove the exhaust system. Refer to «Exhaust System Replacement»(/chevrolet/equinox/i-2004-2009/remont/exhaust/#engine-exhaust-system) in Engine Exhaust.
6. Remove the evaporative emission (EVAP) canister (4). Refer to «Evaporative Emission (EVAP) Canister Replacement»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2) .
7. Disconnect the chassis fuel supply line (2) from the fuel tank.
8. Disconnect the fuel filler tube, EVAP vent hose, and fresh air hose from the fuel tank.
9. Disconnect the fuel tank electrical connector and remove the electrical connector retainer from the rear frame.
10. Support the fuel tank.
11. Remove the fuel tank strap bolts and fuel tank straps.
12. Lower the fuel tank from the underbody of the vehicle.
13. If replacing the fuel tank, remove the fuel tank module assemblies. Refer to «Fuel Tank Module Replacement - Primary»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2) and «Fuel Tank Module Replacement - Secondary»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2) .

1. If previously removed, install the fuel tank module assemblies. Refer to «Fuel Tank Module Replacement - Primary»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2) and «Fuel Tank Module Replacement - Secondary»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2) .
2. Install the fuel tank heat shield and fuel tank assembly to the vehicle.
3. Install the fuel tank straps and the fuel tank strap-to-body bolts. Tighten: Tighten the bolts to 25 N.m (18 lb ft).
4. Connect the fuel tank electrical connector and install the electrical connector retainer to the rear frame.
5. Connect the EVAP vent, and fresh air hoses to the fuel tank.
6. Connect the fuel filler tube to the fuel tank. Tighten: Tighten the fuel filler tube clamp to 5 N.m (44 lb in).
7. Connect the chassis fuel supply line (2) to the fuel tank.
8. Install the evaporative emission (EVAP) canister (4). Refer to «Evaporative Emission (EVAP) Canister Replacement»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2) .
9. Install the exhaust system. Refer to «Exhaust System Replacement»(/chevrolet/equinox/i-2004-2009/remont/exhaust/#engine-exhaust-system) in Engine Exhaust.
10. Lower the vehicle.
11. Fill the fuel tank with gasoline.
12. Connect the negative battery cable. Refer to «Battery Negative Cable Disconnect/Connect Procedure»(/chevrolet/equinox/i-2004-2009/remont/charging-system/#battery-charging-system-and-starting-system) in Engine Electrical.
13. Prime the fuel system: Cycle the ignition ON for 5 seconds and then OFF for 10 seconds. Repeat the previous step twice. Crank the engine until it starts. The maximum starter motor cranking time is 20 seconds. If the engine does not start, repeat steps 13.1-13.3.

1. Ensure that the fuel level in the tank is less than 1/4 full. If necessary, drain the fuel tank to at least this level. Refer to «Fuel Tank Draining Procedure»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2__fuel-tank-draining-procedure) .
2. Relieve the fuel system pressure. Refer to «Fuel Pressure Relief Procedure»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2) .
3. Disconnect the negative battery cable. Refer to «Battery Negative Cable Disconnect/Connect Procedure»(/chevrolet/equinox/i-2004-2009/remont/charging-system/#battery-charging-system-and-starting-system) in Engine Electrical.
4. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/chevrolet/equinox/i-2004-2009/remont/hoistjack/#general-information) in General Information.
5. Remove the exhaust system. Refer to «Exhaust System Replacement»(/chevrolet/equinox/i-2004-2009/remont/exhaust/#engine-exhaust-system) in Engine Exhaust.
6. Remove the propeller shaft. Refer to «Propeller Shaft Replacement»(/chevrolet/equinox/i-2004-2009/remont/driveshaft-universal-joints/#propeller-shaft-and-universal-joints) in Propeller Shaft.
7. Remove the rear drive module propeller shaft guard (2) mounting bolts (1).
8. Remove the evaporative emission (EVAP) canister (4). Refer to «Evaporative Emission (EVAP) Canister Replacement»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2) .
9. Disconnect the chassis fuel supply line (2) from the fuel tank.
10. Disconnect the fuel filler tube, EVAP vent hose, and fresh air hose from the fuel tank.
11. Disconnect the fuel tank electrical connector and remove the electrical connector retainer from the rear frame.
12. Support the fuel tank.
13. Remove the fuel tank strap bolts and fuel tank straps.
14. Lower the fuel tank from the underbody of the vehicle.
15. If replacing the fuel tank, remove the fuel tank module assemblies. Refer to «Fuel Tank Module Replacement - Primary»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2) and «Fuel Tank Module Replacement - Secondary»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2) .

1. If previously removed, install the fuel tank module assemblies. Refer to «Fuel Tank Module Replacement - Primary»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2) and «Fuel Tank Module Replacement - Secondary»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2) .
2. Install the fuel tank heat shield and fuel tank assembly to the vehicle.
3. Install the fuel tank straps and the fuel tank strap-to-body bolts. Tighten: Tighten the bolts to 25 N.m (18 lb ft).
4. Connect the fuel tank electrical connector and install the electrical connector retainer to the rear frame.
5. Connect the EVAP vent, and fresh air hoses to the fuel tank.
6. Connect the fuel filler tube to the fuel tank. Tighten: Tighten the fuel filler tube clamp to 5 N.m (44 lb in).
7. Connect the chassis fuel supply line (2) to the fuel tank.
8. Install the evaporative emission (EVAP) canister (4). Refer to «Evaporative Emission (EVAP) Canister Replacement»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2) .
9. Install the rear drive module propeller shaft guard (2).
10. Install the rear drive module propeller shaft guard mounting bolts (1). Tighten: Tighten the bolts to 25 N.m (18 lb ft).
11. Install the propeller shaft. Refer to «Propeller Shaft Replacement»(/chevrolet/equinox/i-2004-2009/remont/driveshaft-universal-joints/#propeller-shaft-and-universal-joints) in Propeller Shaft.
12. Install the exhaust system. Refer to «Exhaust System Replacement»(/chevrolet/equinox/i-2004-2009/remont/exhaust/#engine-exhaust-system) in Engine Exhaust.
13. Lower the vehicle.
14. Fill the fuel tank with gasoline.
15. Connect the negative battery cable. Refer to «Battery Negative Cable Disconnect/Connect Procedure»(/chevrolet/equinox/i-2004-2009/remont/charging-system/#battery-charging-system-and-starting-system) in Engine Electrical.
16. Prime the fuel system: Cycle the ignition ON for 5 seconds and then OFF for 10 seconds. Repeat the previous step twice. Crank the engine until it starts. The maximum starter motor cranking time is 20 seconds. If the engine does not start, repeat steps 13.1-13.3.

1. Remove the fuel tank. Refer to «Fuel Tank Replacement (FWD)»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2) or «Fuel Tank Replacement (AWD)»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2) .
2. Disconnect the fuel pump module harness electrical connector from the fuel tank pressure sensor.
3. Position 2 flat-bladed screwdrivers, one on each side of the sensor, near the vacuum port.
4. Carefully use the screwdrivers to lift and release the sensor from the fuel pump module.

1. Install the fuel tank pressure sensor to the fuel pump module assembly. Ensure that the sensor grommet is fully seated to the pump module.
2. Connect the pump module electrical connector to the fuel tank pressure sensor.
3. Install the fuel tank. Refer to «Fuel Tank Replacement (FWD)»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2) or «Fuel Tank Replacement (AWD)»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2) .

1. Remove the fuel tank. Refer to «Fuel Tank Replacement (FWD)»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2) or «Fuel Tank Replacement (AWD)»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2) .
2. Remove the fuel pump module. Refer to «Fuel Tank Module Replacement - Primary»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2) .
3. Disconnect the fuel level sender unit and float electrical connector from the underside of the top of the pump module.
4. Release the retaining tabs (1, 2) and remove the level sensor by sliding up.

1. Install the fuel level sender unit and float onto the fuel pump module. Make sure that the sender cap snaps into place (1, 2).
2. Connect the fuel level sender unit and float electrical connector.
3. Install the fuel pump module into the fuel tank. Refer to «Fuel Tank Module Replacement - Primary»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2) .
4. Install the fuel tank. Refer to «Fuel Tank Replacement (FWD)»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2) or «Fuel Tank Replacement (AWD)»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2) .

1. Remove the fuel tank. Refer to «Fuel Tank Replacement (FWD)»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2) or «Fuel Tank Replacement (AWD)»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2) .
2. Remove the fuel pump module. Refer to «Fuel Tank Module Replacement - Secondary»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2) .
3. Disconnect the fuel level sender unit and the float electrical connector.
4. Release the retaining tabs and remove the level sensor by sliding up.

1. Install the fuel level sender unit and float onto the fuel pump module. Make sure that the sender cap snaps into place.
2. Connect the fuel level sender unit and the float electrical connector.
3. Install the fuel pump module into the fuel tank. Refer to «Fuel Tank Module Replacement - Secondary»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2) .
4. Install the fuel tank. Refer to «Fuel Tank Replacement (FWD)»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2) or «Fuel Tank Replacement (AWD)»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2) .

1. Ensure that the fuel level in the tank is less than 1/4 full. If necessary, drain the fuel tank to at least this level. Refer to «Fuel Tank Draining Procedure»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2__fuel-tank-draining-procedure) .
2. Remove the fuel filler cap.
3. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/chevrolet/equinox/i-2004-2009/remont/hoistjack/#general-information) in General Information.
4. Remove the right rear wheel and tire. Refer to «Tire and Wheel Removal and Installation»(/chevrolet/equinox/i-2004-2009/remont/wheel-tire-system/#tires-and-wheels) in Tires and Wheels.
5. Remove the right rear wheelhouse inner liner. Refer to «Wheelhouse Liner Panel Replacement - Rear»(/chevrolet/equinox/i-2004-2009/remont/exterior-body-panels/#body-rear-end) in Body Rear End.
6. Loosen the fuel filler tube hose clamp.
7. Disconnect the fuel filler tube, the fuel filler vent tube, and the fresh air hose from the fuel tank.
8. Remove the fuel filler tube bracket bolts (2).
9. Remove the fuel filler tube (1) from the vehicle.
10. Remove the closeout grommet.
11. Separate the fresh air hose from the fuel filler tube.

1. Attach the fresh air hose to the fuel filler tube.
2. Install the closeout grommet.
3. Position the fuel filler tube (1) to the vehicle.
4. Position the fuel filler tube to the closeout grommet (1).
5. Install the fuel filler tube bracket bolts (2). Tighten: Tighten the bolt to 12 N.m (106 lb in).
6. Position the filler tube-to-fuel tank connecting hose and hose clamp. Tighten: Tighten the clamp to 5 N.m (44 lb in).
7. Connect the fuel filler vent tube and fresh air hose.
8. Install the inner wheelhouse liner. Refer to «Wheelhouse Liner Panel Replacement - Rear»(/chevrolet/equinox/i-2004-2009/remont/exterior-body-panels/#body-rear-end) in Body Front End.
9. Install the wheel and tire. Refer to «Tire and Wheel Removal and Installation»(/chevrolet/equinox/i-2004-2009/remont/wheel-tire-system/#tires-and-wheels) in Tires and Wheels.
10. Lower the vehicle from the hoist.
11. Install the fuel filler cap.
12. Perform the Service Bay Diagnostic Test for the EVAP emission system using the scan tool. This test will verify the integrity of the vapor handling areas of the fuel system.

Note. Do not attempt to repair the engine fuel feed pipe or the engine fuel return pipe. Replace a damaged engine fuel feed pipe or the engine fuel return pipe.

1. Remove the exhaust crossover pipe. Refer to «Exhaust Crossover Pipe Replacement»(/chevrolet/equinox/i-2004-2009/remont/exhaust/#engine-exhaust-system) in Engine Exhaust.
2. Relieve the fuel system pressure. Refer to «Fuel Pressure Relief Procedure»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2) .
3. Remove the 2 nuts securing the fuel hose/pipe to the engine and transaxle.
4. Remove the fuel hose/pipe retainers from the threaded studs on the engine and transaxle.
5. Clean all engine fuel pipe connections and areas surrounding the engine fuel pipe connections before disconnecting the engine fuel pipe connections to avoid possible contamination of the fuel system.
6. Disconnect the engine compartment fuel hose/pipe (2) from the chassis fuel hose/pipe (3). Refer to «Quick Connect Fitting(s) Service (Metal Collar)»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2) .
7. Cap the fuel hose/pipes to prevent contamination and fuel leakage.
8. Disconnect the engine compartment fuel hose/pipe (1) from the fuel rail (4). Refer to «Quick Connect Fitting(s) Service (Metal Collar)»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2)
9. Cap the fuel hose/pipes to prevent contamination and fuel leakage.
10. Remove the fuel hose/pipe from the fuel pipe retainer (2).

1. Position the fuel hose/pipe to the engine.
2. Install the fuel hose/pipe retainers to the threaded studs on the engine and transaxle.
3. Install the 2 nuts securing the fuel hose/pipe to the engine and transaxle. Tighten: Tighten the nuts to 28 N.m (21 lb ft).
4. Install the fuel hose/pipe to the fuel pipe retainer (2).
5. Remove the caps from the fuel pipes.
6. Connect the engine compartment fuel hose/pipe (1) to the fuel rail (4). Refer to «Quick Connect Fitting(s) Service (Metal Collar)»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2)
7. Remove the caps from the fuel pipes.
8. Connect the engine compartment fuel hose/pipe (2) to the chassis fuel hose/pipe (3). Refer to «Quick Connect Fitting(s) Service (Metal Collar)»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2) .
9. Install the exhaust crossover pipe. Refer to «Exhaust Crossover Pipe Replacement»(/chevrolet/equinox/i-2004-2009/remont/exhaust/#engine-exhaust-system) in Engine Exhaust.
10. Prime the fuel system. Cycle the ignition ON for 5 seconds and then OFF for 10 seconds. Repeat step 7.1 twice. Crank the engine until it starts. The maximum starter motor cranking time is 20 seconds. If the engine does not start, repeat steps 7.1-7.4.
11. Run the engine and check for fuel system leaks.

Note. Fuel/Vapor lines cannot be spliced or repaired. The line must be replaced (if damaged) with the same type of line.

1. Relieve the fuel system pressure. Refer to «Fuel Pressure Relief Procedure»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2) .
2. Disconnect the negative battery terminal. Refer to «Battery Negative Cable Disconnect/Connect Procedure»(/chevrolet/equinox/i-2004-2009/remont/charging-system/#battery-charging-system-and-starting-system) in Engine Electrical.
3. Disconnect the engine compartment fuel hose/pipe (2) from the chassis fuel hose/pipe (3). Refer to «Quick Connect Fitting(s) Service (Metal Collar)»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2) .
4. Cap the fuel hose/pipes to prevent contamination and fuel leakage.
5. Raise the vehicle. Refer to «Lifting and Jacking the Vehicle»(/chevrolet/equinox/i-2004-2009/remont/hoistjack/#general-information) in General Information.
6. Disconnect the chassis fuel hose/pipe (2) from the fuel tank. Refer to «Quick Connect Fitting(s) Service (Metal Collar)»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2)
7. Cap the fuel hose/pipes to prevent contamination and fuel leakage.
8. Release the pipe retainers (1) from the vehicle underbody.
9. Remove the fuel hose/pipe from the pipe retainers.
10. Remove the fuel hose/pipe from the vehicle.

1. Install the fuel hose/pipe to the vehicle.
2. Install the fuel hose/pipe from the pipe retainers.
3. Attach the pipe retainers (1) to the vehicle underbody.
4. Remove the caps from the fuel pipes.
5. Connect the chassis fuel hose/pipe (2) to the fuel tank. Refer to «Quick Connect Fitting(s) Service (Metal Collar)»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2)
6. Lower the vehicle from the hoist.
7. Remove the caps from the fuel pipes.
8. Connect the engine compartment fuel hose/pipe (2) to the chassis fuel hose/pipe (3). Refer to «Quick Connect Fitting(s) Service (Metal Collar)»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2) .
9. Connect the negative battery terminal. Refer to «Battery Negative Cable Disconnect/Connect Procedure»(/chevrolet/equinox/i-2004-2009/remont/charging-system/#battery-charging-system-and-starting-system) in Engine Electrical.
10. Prime the fuel system. Cycle the ignition ON for 5 seconds and then OFF for 10 seconds. Repeat cycling twice. Crank the engine until it starts. The maximum starter motor cranking time is 20 seconds. If the engine does not start, repeat steps.
11. Run the engine and check the system for leaks.

Fuel System Cleaning

1. Remove the fuel tank. Refer to «Fuel Tank Replacement (FWD)»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2) or «Fuel Tank Replacement (AWD)»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2) .
2. Remove the fuel sender assembly. Refer to «Fuel Tank Module Replacement - Primary»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2) .
3. Inspect the fuel sender strainer. Replace a contaminated strainer and inspect the fuel pump.
4. Inspect the fuel pump inlet for dirt and debris. Replace the fuel pump if you find dirt or debris in the fuel pump inlet.
5. Flush the fuel tank with hot water.
6. 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.
7. Install the fuel sender assembly. Refer to «Fuel Tank Module Replacement - Primary»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2) .
8. Install the fuel tank. Refer to «Fuel Tank Replacement (FWD)»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2) or «Fuel Tank Replacement (AWD)»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2) .

1. Relieve the fuel system pressure. Refer to «Fuel Pressure Relief Procedure»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2) .
2. Remove the upper intake manifold. Refer to «Intake Manifold Replacement - Upper»(ref-239708-S31057660522006080100000) in Engine Mechanical.
3. Disconnect the engine fuel feed pipe (1) at the fuel rail (4). Refer to «Quick Connect Fitting(s) Service (Metal Collar)»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2) .
4. Disconnect the main fuel injector harness electrical connector.
5. Disconnect the coolant temperature sensor and camshaft position sensor electrical connectors
6. Disconnect the electrical connectors from the fuel injectors.
7. Remove the fuel rail retaining bolts (2).
8. Remove the fuel rail assembly (1).
9. Remove the injector O-ring seal from the spray tip end of each injector.
10. If removing the fuel injectors from the fuel rail is necessary. Refer to «Fuel Injector Replacement»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2) .

Note. Use care when servicing the fuel system components, especially the fuel injector electrical connectors, the fuel injector tips, and the injector O-rings. Plug the inlet and the outlet ports of the fuel rail in order to prevent contamination. Do not use compressed air to clean the fuel rail assembly as this may damage the fuel rail components. Do not immerse the fuel rail assembly in a solvent bath in order to prevent damage to the fuel rail assembly.

1. If the fuel injectors were removed from the fuel rail. Refer to «Fuel Injector Replacement»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2) .
2. Lubricate the fuel injector O-rings using GM P/N 12345616, (Canadian P/N 993182)
3. Install the fuel injector nozzles into the lower intake manifold injector bores.
4. Press on the fuel rail (1) using the palms of both hands until the fuel injectors are fully seated.
5. Install the fuel rail attaching bolts (2). Tighten: Tighten the bolt to 10 N.m (89 lb in).
6. Install the injector electrical harness to the fuel rail.
7. Apply lubricant to the fuel injector electrical connectors. GM P/N 12377900, (Canadian P/N 10953529).
8. Connect the fuel injector electrical connectors.
9. Connect the coolant temperature sensor and camshaft position sensor electrical connectors
10. Connect the main fuel injector electrical harness connector.
11. Connect the fuel feed pipe (1) at the fuel rail (4). Refer to «Quick Connect Fitting(s) Service (Metal Collar)»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2) .
12. Install the upper intake manifold. Refer to «Intake Manifold Replacement - Upper»(ref-239708-S31057660522006080100000) in Engine Mechanical.
13. Connect the negative battery cable.
14. Inspect for fuel leaks. Turn ON the ignition for 2 seconds. Turn OFF the ignition for 10 seconds. Turn ON the ignition. Inspect for fuel leaks.

Fuel Injector Cleaning Procedure

Tools Required

1. J 37287 Fuel Line Shut-Off Adapters. See «Special Tools»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2__special-tools) .
2. J 35800-A Fuel Injector Cleaner
3. J 42873-1 3/8 Fuel Line Shut-Off Valve
4. J 42873-2 5/16 Return Pipe Shut-Off Valve
5. J 42964-1 3/8 Fuel Pipe Shut-Off Valve
6. J 42964-2 5/16 Fuel Pipe Shut-Off Valve

Note. GM Top-Engine Cleaner is the only injector cleaning agent recommended. Do not use other cleaning agents, as they may contain methanol which can damage fuel system components. Under NO circumstances should the top engine cleaner be added to the vehicles fuel tank, as it may damage the fuel pump and other system components. Do not exceed a 10 percent cleaning solution concentration. Higher concentrations may damage fuel system components. Testing has demonstrated that exceeding the 10 percent cleaning solution concentration does not improve the effectiveness of this procedure.

1. Obtain J 35800-A (2).
2. For US dealers, empty 2 pre-measured GM Top-Engine Cleaner containers, 24 ml (0.812 oz) each, GM P/N 12346535, into the J 35800-A .
3. For Canadian dealers, measure and dispense 48 ml (1.62 oz) of Top-Engine Cleaner, Canadian P/N 992872, into the J 35800-A .
4. If you are using any other brand of tank you will need a total of 96 ml (3.24 oz) of Top-Engine Cleaner mixed with 864 ml (29.16 oz) of regular unleaded gasoline.
5. Fill the injector cleaning tank with regular unleaded gasoline. Be sure to follow all additional instructions provided with the tool.
6. Electrically disable the vehicle fuel pump by removing the fuel pump relay and disconnecting the oil pressure switch connector, if equipped.
7. Disconnect the fuel feed and return line, if equipped, at the fuel rail. Plug the fuel feed and return line, if equipped, coming off the fuel rail with J 37287 , or J 42964-1 , and J 42964-2 or J 42873-1 , and J 42873-2 as appropriate for the fuel system.
8. Connect the J 35800-A to the vehicle fuel rail.
9. Pressurize the J 35800-A to 510 kPa (75 psi).
10. Start and idle the engine until it stalls due to lack of fuel. This should take approximately 15-20 minutes.
11. Disconnect J 35800-A from the fuel rail.
12. Reconnect the vehicle fuel pump relay and oil pressure switch connector, if equipped.
13. Remove J 37287 or J 42964-1 , and J 42964-2 or J 42873-1 , and J 42873-2 and reconnect the vehicle fuel feed and return lines.
14. Start and idle the vehicle for an additional 2 minutes to ensure residual injector cleaner is flushed from the fuel rail and fuel lines.
15. Repeat steps 1-5 of the Injector Balance Test, and record the fuel pressure drop from each injector.
16. Subtract the lowest fuel pressure drop from the highest fuel pressure drop. If the value is 15 kPa (2 psi) or less, no additional action is required. If the value is greater than 15 kPa (2 psi), replace the injector with the lowest fuel pressure drop.
17. Add one ounce of Port Fuel Injector Cleaner, GM P/N 12345104 (Canadian P/N 10953467), to the vehicle fuel tank for each gallon of gasoline estimated to be in the fuel tank. Instruct the customer to add the reminder of the bottle of Port Fuel Injector Cleaner to the vehicle fuel tank at the next fill-up.
18. Advise the customer to change brands of fuel and to add GM Port Fuel Injector Cleaner every 5 000 km (3,000 mi). GM Port Fuel Injector Cleaner contains the same additives that the fuel companies are removing from the fuel to reduce costs. Regular use of GM Port Fuel Injector Cleaner should keep the customer from having to repeat the injector cleaning procedure.
19. Road test the vehicle to verify that the customer concern has been corrected.

Note. Use care in removing the fuel injectors in order to prevent damage to the fuel injector electrical connector pins or the fuel injector nozzles. Do not immerse the fuel injector in any type of cleaner. The fuel injector is an electrical component and may be damaged by this cleaning method.

1. Remove the fuel rail. Refer to «Fuel Rail Assembly Replacement»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2) .
2. Remove the fuel injector retaining clip (1).
3. Remove the fuel injector (3) from the fuel rail.
4. Remove the fuel injector upper O-ring (2).
5. Remove the fuel injector lower O-ring (4).

1. Install the fuel injector upper O-ring (2).
2. Install the fuel injector lower O-ring (4).
3. Lubricate the fuel injector upper O-ring (2) using GM P/N 12345616 (Canadian P/N 993182).
4. Install the fuel injector (3) to the fuel rail.
5. Install the fuel injector retaining clip (1).
6. Install the fuel rail. Refer to «Fuel Rail Assembly Replacement»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2) .

1. Turn OFF the ignition.
2. Disconnect the evaporative emission (EVAP) canister purge solenoid valve electrical connector.
3. Disconnect the EVAP canister purge solenoid valve hose/pipe.
4. Remove the EVAP canister purge solenoid valve retaining bolt (2).
5. Remove the EVAP canister purge solenoid valve (1) from the intake manifold.

1. Position the EVAP canister purge solenoid valve (1) on the intake manifold.
2. install the EVAP canister purge solenoid valve bolt (2). Tighten: Tighten the EVAP canister purge valve retaining bolt to 10 N.m (89 lb in).
3. Connect the EVAP canister purge solenoid valve hose/pipe.
4. Connect the EVAP canister purge solenoid valve electrical connector.

1. Remove the evaporative emission (EVAP) canister from the vehicle. Refer to «Evaporative Emission (EVAP) Canister Replacement»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2) .
2. Rotate the EVAP canister vent valve counterclockwise to release from the locked position.
3. Remove the vent valve from the EVAP canister.

1. Insert the EVAP canister vent solenoid valve into the EVAP canister, with the valve aligned to the released position.
2. Rotate vent valve clockwise to secure into the locked position.
3. Install the EVAP canister to the vehicle. Refer to «Evaporative Emission (EVAP) Canister Replacement»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2) .

1. Remove the generator. Refer to «Generator Replacement»(/chevrolet/equinox/i-2004-2009/remont/charging-system/#battery-charging-system-and-starting-system) in Engine Electrical.
2. Remove the nuts (1) securing the evaporative emission (EVAP) hose/pipe (2) to the strut tower.
3. Disconnect the EVAP purge hose/pipe (2) from the purge solenoid. Refer to «Quick Connect Fitting(s) Service (Plastic Collar)»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2) .
4. Disconnect the engine EVAP purge hose/pipe from the chassis EVAP purge hose/pipe. Refer to «Quick Connect Fitting(s) Service (Plastic Collar)»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2) .
5. Cap or plug both the engine and chassis EVAP purge hose/pipes to prevent contamination.
6. Remove the EVAP hose/pipe (2) from the retainer (3).
7. Remove the EVAP hose/pipe (2) from the vehicle.

1. Install the EVAP hose/pipe (2) to the vehicle.
2. Install the EVAP hose/pipe (2) to the retainer (3).
3. Remove the caps or plugs from both the engine and chassis EVAP purge hose/pipes.
4. Connect the engine EVAP purge hose/pipe to the chassis EVAP purge hose/pipe. Refer to «Quick Connect Fitting(s) Service (Plastic Collar)»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2) .
5. Connect the EVAP purge hose/pipe (2) to the purge solenoid. Refer to «Quick Connect Fitting(s) Service (Plastic Collar)»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2) .
6. Install the nuts (1) securing the evaporative emission EVAP hose/pipe (2) to the strut tower. Tighten: Tighten the nuts to 10 N.m (89 lb in).
7. Install the generator. Refer to «Generator Replacement»(/chevrolet/equinox/i-2004-2009/remont/charging-system/#battery-charging-system-and-starting-system) in Engine Electrical.

Note. Fuel/Vapor lines cannot be spliced or repaired. The line must be replaced (if damaged) with the same type of line.

1. Disconnect the engine evaporative emission (EVAP) purge hose/pipe from the chassis EVAP purge hose/pipe. Refer to «Quick Connect Fitting(s) Service (Plastic Collar)»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2) .
2. Cap or plug both the engine and chassis EVAP purge hose/pipes to prevent contamination.
3. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/chevrolet/equinox/i-2004-2009/remont/hoistjack/#general-information) in General Information.
4. Disconnect the EVAP purge hose/pipe from the EVAP canister. Refer to «Quick Connect Fitting(s) Service (Plastic Collar)»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2) .
5. Cap or plug both the EVAP purge hose/pipe and canister to prevent contamination.
6. Release the pipe retainers (1) from the vehicle underbody.
7. Remove the purge pipe from the pipe retainers.
8. Remove the purge pipe from the vehicle.

1. Position the purge pipe to the vehicle.
2. Install the purge pipe to the pipe retainers.
3. Secure the pipe retainers (1) to the vehicle underbody.
4. Remove the caps or plugs from both the EVAP purge hose/pipe and canister.
5. Connect the EVAP purge hose/pipe to the EVAP canister. Refer to «Quick Connect Fitting(s) Service (Plastic Collar)»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2) .
6. Lower the vehicle.
7. Remove the caps or plugs from both the engine and chassis EVAP purge hose/pipes.
8. Connect the engine EVAP purge hose/pipe to the chassis EVAP purge hose/pipe. Refer to «Quick Connect Fitting(s) Service (Plastic Collar)»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2) .

1. Raise the vehicle on a hoist. Refer to «Lifting and Jacking the Vehicle»(/chevrolet/equinox/i-2004-2009/remont/hoistjack/#general-information) in General Information.
2. Disconnect the EVAP canister fresh air hose/pipe from the fuel tank fresh air hose/pipe (2).
3. Disconnect the EVAP canister vent hose/pipe from the EVAP canister.
4. Disconnect the EVAP canister purge hose/pipe (1) from the EVAP canister.
5. Remove the EVAP canister-to-underbody nuts (3).
6. Lower the EVAP canister (4).
7. Disconnect the EVAP vent solenoid electrical connector (1).
8. Remove the EVAP canister (4) from the vehicle.

1. Connect the EVAP vent solenoid electrical connector (1).
2. Install the EVAP canister (4) to the underbody of the vehicle.
3. Install the EVAP canister-to-underbody nuts (3). Tighten: Tighten the nuts to 9 N.m (80 lb in).
4. Connect the EVAP canister purge hose/pipe (1) to the EVAP canister (4).
5. Connect the EVAP canister vent hose/pipe (3) to the EVAP canister.
6. Connect the EVAP canister fresh air hose/pipe to the fuel tank fresh air hose/pipe (2).
7. Lower the vehicle.

1. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/chevrolet/equinox/i-2004-2009/remont/hoistjack/#general-information) in General Information.
2. Remove the EVAP canister from the vehicle. Refer to «Evaporative Emission (EVAP) Canister Replacement»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2) .
3. Carefully release the canister filter cover rear retaining tabs.
4. Carefully release the canister filter cover forward retaining tabs and remove the cover from the EVAP canister.
5. Discard the EVAP canister filter cover.
6. Remove the filter from the canister and discard the filter.
7. Clean the inside of the EVAP canister filter housing with a clean shop towel.

1. Install a NEW filter to the canister filter housing.
2. Install a NEW EVAP filter cover to the EVAP canister.
3. Install the EVAP canister to the vehicle. Refer to «Evaporative Emission (EVAP) Canister Replacement»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2) .
4. Lower the vehicle.

J 41413 EVAP Pressure and Purge Station. See Special Tools .

Inspection Procedure

Note. Refer to Clean, Dry, Low Pressure Gas Source Notice in Cautions and Notices.

1. Turn OFF the ignition.
2. Remove the EVAP canister purge valve. Refer to «Evaporative Emission (EVAP) Canister Purge Solenoid Valve Replacement»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2) .
3. Lightly tap the EVAP canister purge valve on a hard surface.
4. Inspect for carbon particles exiting either of the vacuum ports. If no carbon particles were detected, but a blockage was detected during a diagnostic procedure, install the original EVAP canister purge valve. Continue with the cleaning procedure. If carbon particles are found during the inspection procedure, continue with the cleaning procedure. If a diagnostic procedure directed you to replace the EVAP canister purge valve and no carbon particles were detected, replace the EVAP canister purge valve. Return to the published service procedure.

Cleaning Procedure

1. Raise the vehicle. Refer to «Lifting and Jacking the Vehicle»(/chevrolet/equinox/i-2004-2009/remont/hoistjack/#general-information) in General Information.
2. Remove the EVAP canister. Refer to «Evaporative Emission (EVAP) Canister Replacement»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2) .
3. Turn OFF the main valve on the J 41413 . See «Special Tools»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2__special-tools) .
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 (EVAP) Canister Replacement»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2) .
11. Lower the vehicle.
12. Install a new EVAP canister purge valve. Refer to «Evaporative Emission (EVAP) Canister Purge Solenoid Valve Replacement»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2) .
13. Return to the diagnostic table that sent you here.

1. Remove the injector sight shield. Refer to «Fuel Injector Sight Shield Replacement»(ref-239708-S25503173132006080100000) in Engine Mechanical - 3.4L.
2. Disconnect the spark plug wires. Note the position from which the wires are removed.
3. Disconnect the ignition coil/control module electrical connectors.
4. Remove the 4 bolts securing the ignition coil/control module to the ignition control module bracket.
5. Remove the ignition coil/control module.

1. Install the ignition coil/control module to the ignition control module bracket.
2. Install the 4 bolts securing the ignition coil/control module to the ignition control module bracket. Tighten: Tighten the bolts to 4.5 N.m (40 lb in).
3. Connect the ignition coil/control module electrical connectors.
4. Connect the spark plug wires.
5. Install the injector sight shield. Refer to «Fuel Injector Sight Shield Replacement»(ref-239708-S25503173132006080100000) in Engine Mechanical - 3.4L.

1. Remove the injector sight shield. Refer to «Fuel Injector Sight Shield Replacement»(ref-239708-S25503173132006080100000) in Engine Mechanical - 3.4L.
2. Disconnect the ignition coil/control module electrical connectors.
3. Remove the spark plug wire retainer (1) from the ignition control module bracket.
4. Remove the 4 bolts securing the ignition coil/control module to the ignition control module bracket.
5. Position the ignition coil/control module aside out of the way.
6. Remove the bolt (3) from the fuel injector wire harness bracket (4) and positive crankcase ventilation (PCV) valve fresh air tube retainer.
7. Remove the engine wire harness retainers from the ignition control module bracket studs (5).
8. Remove the nut (1) retaining the heater outlet pipe.
9. Lift pipe up slightly to gain access for the removal of the 2 ignition control module bracket bolts.
10. Remove the ignition control module bracket bolts (2).
11. Remove the ignition control module bracket nuts (6).
12. Remove the ignition control module bracket.

1. Install the ignition control module bracket.
2. Install the ignition control module bracket nuts (6). Tighten: Tighten the nuts to 25 N.m (18 lb ft).
3. Install the ignition control module bracket bolts (2). Tighten: Tighten the bolts to 25 N.m (18 lb ft).
4. Install the nut (1) retaining the heater outlet pipe. Tighten: Tighten the nut to 25 N.m (18 lb ft).
5. Install the engine wire harness retainers to the ignition control module bracket studs (5).
6. Install the bolt (3) from the fuel injector wire harness bracket (4) and PCV valve fresh air tube retainer. Tighten: Tighten the bolts to 5 N.m (44 lb in).
7. Install the ignition coil/control module to the ignition control module bracket.
8. Install the 4 bolts securing the ignition coil/control module to the ignition control module bracket. Tighten: Tighten the bolts to 4.5 N.m (40 lb in).
9. Install the spark plug wire retainer (1) to the ignition control module bracket.
10. Connect the ignition coil/control module electrical connectors.
11. Install the injector sight shield. Refer to «Fuel Injector Sight Shield Replacement»(ref-239708-S25503173132006080100000) in Engine Mechanical - 3.4L.

Spark Plug Wire Inspection

Spark plug wire integrity is vital for proper engine operation. A thorough inspection will be necessary to accurately identify conditions that may affect engine operation. Refer to the list below for items to be inspected.

1. Inspect for correct routing of the spark plug wires. Improper routing may cause cross-firing.
2. Inspect each wire for any signs of cracks or splits in the wire.
3. Inspect each boot for the following conditions: Tearing Piercing Arcing Carbon tracking Corroded terminal

If corrosion, carbon tracking, or arcing are indicated on a spark plug wire boot or terminal, both the wire and the component connected to the wire should be replaced.

1. Remove the injector sight shield. Refer to «Fuel Injector Sight Shield Replacement»(ref-239708-S25503173132006080100000) in Engine Mechanical - 3.4L.
2. Remove the spark plug wires (1) from the left side spark plugs.
3. Remove the spark plug wires from the retaining clips (2).
4. Remove the spark plug wires (1) from the right side spark plugs.
5. Remove the spark plug wires from the retaining clips (2).
6. Remove the spark plug wires from the ignition coil/control module.
7. Remove the spark plug wires from the engine.
8. If you are replacing the spark plug wires, transfer any of the following components: Boot heat shields Spark plug wire conduit Spark plug wire retaining clips

1. Install the spark plug wires (1) to the ignition coil/control module.
2. Install the spark plug wires (1) to the right side spark plugs.
3. Install the spark plug wires to the retaining clips (2).
4. Install the spark plug wires (1) to the left side spark plugs.
5. Install the spark plug wires to the retaining clips (2).
6. Install the injector sight shield. Refer to «Fuel Injector Sight Shield Replacement»(ref-239708-S25503173132006080100000) in Engine Mechanical - 3.4L.

Spark Plug Usage

1. Ensure that the correct spark plug is installed. An incorrect spark plug causes driveability conditions. Refer to «Ignition System Specifications»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2__ignition-system-specifications) 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

Spark Plug Inspection

1. Inspect the terminal post (1) for damage. Inspect for a bent or broken terminal post (1). Test for a loose terminal post (1) by twisting and pulling the post. The terminal post (1) should NOT move.
2. Inspect the insulator (2) for flashover or carbon tracking, soot. This is caused by the electrical charge traveling across the insulator (2) between the terminal post (1) and ground. Inspect for the following conditions: Inspect the spark plug boot for damage. Inspect the spark plug recess area of the cylinder head for moisture, such as oil, coolant, or water. A spark plug boot that is saturated causes arcing to ground.
3. Inspect the insulator (2) for cracks. All or part of the electrical charge may arc through the crack instead of the electrodes (3, 4).
4. Inspect for evidence of improper arcing. Measure the gap between the center electrode (4) and the side electrode (3) terminals. Refer to «Ignition System Specifications»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2__ignition-system-specifications) . An excessively wide electrode gap can prevent correct spark plug operation. Inspect for the correct spark plug torque. Refer to «Fastener Tightening Specifications»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2__fastener-tightening-specifications) . Insufficient torque can prevent correct spark plug operation. An over torqued spark plug, causes the insulator (2) to crack. Inspect for signs of tracking that occurred near the insulator tip instead of the center electrode (4). Inspect for a broken or worn side electrode (3). Inspect for a broken, worn, or loose center electrode (4) by shaking the spark plug. A rattling sound indicates internal damage. A loose center electrode (4) reduces the spark intensity. Inspect for bridged electrodes (3, 4). Deposits on the electrodes (3, 4) reduce or eliminates the gap. Inspect for worn or missing platinum pads on the electrodes (3, 4), if equipped. Inspect for excessive fouling.
5. Inspect the spark plug recess area of the cylinder head for debris. Dirty or damaged threads can cause the spark plug not to seat correctly during installation.

Spark Plug Visual Inspection

1. Normal operation-Brown to grayish-tan with small amounts of white powdery deposits are normal combustion by-products from fuels with additives.
2. Carbon fouled-Dry, fluffy, black carbon or soot caused by the following conditions: Rich fuel mixtures Leaking fuel injectors Excessive fuel pressure Restricted air filter element Incorrect combustion Reduced ignition system voltage output Weak coils Worn ignition wires Incorrect spark plug gap Excessive idling or slow speeds under light loads can keep spark plug temperatures so low that normal combustion deposits may not burn off.
3. Deposit fouling-Oil, coolant, or additives that include substances such as silicone, very white coating, reduces the spark intensity. Most powdery deposits will not effect spark intensity unless they form into a glazing over the electrode.

Note. Observe the following service precautions: Allow the engine to cool before removing the spark plugs. Attempting to remove spark plugs from a hot engine can cause the spark plugs to seize. This can damage the cylinder head threads. Clean the spark plug recess area before removing the spark plug. Failure to do so can result in engine damage due to dirt or foreign material entering the cylinder head, or in contamination of the cylinder head threads. Contaminated threads may prevent proper seating of the new spark plug. Use only the spark plugs specified for use in the vehicle. Do not install spark plugs that are either hotter or colder than those specified for the vehicle. Installing spark plugs of another type can severely damage the engine.

1. Remove the spark plug wires from the spark plugs. Refer to «Spark Plug Wire Replacement»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2) .
2. Remove the spark plugs (1) from the cylinder head.

1. Gap the spark plugs to the specifications. Refer to «Ignition System Specifications»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2__ignition-system-specifications) .
2. Install the spark plugs to the cylinder head. Tighten: Tighten the spark plugs to 15 N.m (11 lb ft).
3. Install the spark plug wires to the spark plugs. Refer to «Spark Plug Wire Replacement»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2) .

1. Raise the vehicle. Refer to «Lifting and Jacking the Vehicle»(/chevrolet/equinox/i-2004-2009/remont/hoistjack/#general-information) in General Information.
2. Disconnect the crankshaft position (CKP) sensor electrical connector.
3. Remove the CKP sensor nut (2).
4. Remove the CKP sensor (1) from the engine.
5. Inspect for wear, cracks, or leakage if the CKP sensor is being reused.

1. Lubricate the O-ring with clean engine oil. Replace the O-rings if damaged.
2. Install the CKP sensor (1) to the block.
3. Install the CKP sensor nut (1). Tighten: Tighten the nut to 11 N.m (97 lb in).
4. Connect the CKP sensor electrical connector.
5. Lower the vehicle.

1. Disconnect the camshaft position (CMP) sensor electrical connector.
2. Remove the CMP sensor bolt.
3. Remove the CMP sensor.
4. Inspect the CMP sensor O-rings for wear, cracks, or leakage if the sensor is being reused. Replace the O-rings if damaged.

1. Lubricate the CMP sensor O-rings with clean engine oil.
2. Install the CMP sensor.
3. Install the CMP sensor bolt. Tighten: Tighten the bolt to 10 N.m (89 lb in).
4. Connect the CMP sensor electrical connector.

1. Raise the vehicle. Refer to «Lifting and Jacking the Vehicle»(/chevrolet/equinox/i-2004-2009/remont/hoistjack/#general-information) in General Information.
2. Disconnect the knock sensor (KS) electrical connector.
3. Remove the KS bolt.
4. Remove the KS.

1. Install the KS to engine block.
2. Install the KS bolt. Tighten: Tighten the bolt to 25 N.m (18 lb ft).
3. Connect the KS electrical connector.
4. Lower the vehicle.

1. Remove the exhaust gas recirculation (EGR) pipe (4). Refer to «Exhaust Gas Recirculation (EGR) Pipe Replacement»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2) .
2. Disconnect the EGR valve electrical connector.
3. Remove the EGR valve bolts (2).
4. Remove the EGR valve (1).
5. Remove the EGR valve gasket.
6. Clean the EGR valve mating surface.

1. Install the EGR valve (1) with a new gasket to the intake manifold.
2. Install the EGR valve bolts (2). Tighten: Tighten the bolts to 30 N.m (22 lb ft).
3. Connect the EGR valve electrical connector.
4. Install the EGR pipe (4). Refer to «Exhaust Gas Recirculation (EGR) Pipe Replacement»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2) .

1. Remove the injector sight shield. Refer to «Fuel Injector Sight Shield Replacement»(ref-239708-S25503173132006080100000) in Engine Mechanical - 3.4L.
2. Remove the bolt (3) retaining the exhaust gas recirculation (EGR) pipe (4) to the EGR valve (1).
3. Remove the 2 bolts (5) securing the EGR pipe (4) to the exhaust manifold.
4. Remove the EGR pipe (4).
5. Remove the EGR pipe to exhaust manifold gasket.

1. Install the EGR pipe to exhaust manifold gasket.
2. Install the EGR pipe (4).
3. Install the 2 bolts (5) that secure the EGR pipe (4) to exhaust manifold. Tighten: Tighten the bolts to 10 N.m (89 lb in).
4. Install the bolt (3) the secures the EGR pipe (4) bolt to the EGR valve (1). Tighten: Tighten the bolt to 30 N.m (22 lb ft).
5. Install the injector sight shield. Refer to «Fuel Injector Sight Shield Replacement»(ref-239708-S25503173132006080100000) in Engine Mechanical - 3.4L.

Exhaust Gas Recirculation (EGR) System Cleaning

Proper EGR system service consists of the following steps

1. Remove, clean and inspect the EGR pipe. Refer to «Exhaust Gas Recirculation (EGR) Pipe Replacement»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2) .
2. Remove, clean and inspect the EGR valve. Refer to «Exhaust Gas Recirculation (EGR) Valve Replacement»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2) .
3. The EGR valve can be inspected for deposits and cleaned using the following procedure: While holding the EGR valve base in your hand, try to rotate the connector housing. Replace the valve that exhibits looseness. Inspect the EGR valve pintle and seat for deposits. Use a cloth or other suitable soft device to remove deposits. Remove all loose particles. If deposits are such that pintle/base interface cannot be cleaned adequately to allow the pintle to seal against the seat, replace the valve. Damage to the EGR valve base will occur if cleaned with solvents, sharp tools, wire brush, wheel or sand blasting. Cleaning by these methods is not recommended.
4. Install the EGR valve. Refer to «Exhaust Gas Recirculation (EGR) Valve Replacement»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2) .
5. Install the EGR pipe. Refer to «Exhaust Gas Recirculation (EGR) Pipe Replacement»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2) .

1. Loosen the clamps at both ends of the air cleaner intake duct.
2. Remove the positive crankcase ventilation (PCV) fresh air pipe from the air cleaner intake duct.
3. Remove the air cleaner intake duct from the mass air flow (MAF) sensor and throttle body.

1. Install the air cleaner intake duct to the MAF sensor and throttle body.
2. Install the PCV fresh air pipe to the air cleaner intake duct.
3. Tighten the clamps at both ends of the air cleaner intake duct. Tighten: Tighten the clamps to 4 N.m (35 lb in).

1. Remove the air cleaner intake duct. Refer to «Air Cleaner Intake Duct Replacement»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2) .
2. Disconnect the mass air flow (MAF) sensor electrical connector.
3. Release the clamps (2) on the side of the air cleaner assembly.
4. Remove the air cleaner assembly lid (1) by tilting to release the lid from the lower housing.
5. Remove the air cleaner element (2) from the lower housing (1).

1. Install the air cleaner element (2) into the lower housing (1).
2. Install the air cleaner assembly lid (1) by first engaging the hinge then lower the cover into the closed position.
3. Fasten the clamps (2) on the side of the air cleaner assembly.
4. Connect the MAF sensor electrical connector.
5. Install the air cleaner intake duct. Refer to «Air Cleaner Intake Duct Replacement»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2) .

1. Remove the air cleaner intake duct. Refer to «Air Cleaner Intake Duct Replacement»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2) .
2. Disconnect the mass air flow (MAF) sensor electrical connector.
3. Remove the air cleaner assembly bolt (2).
4. Remove the air cleaner assembly (1).
5. If replacing the air cleaner assembly, remove the MAF sensor. Refer to «Mass Air Flow (MAF) Sensor Replacement»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2) .

1. If the air cleaner assembly (1) was replaced, install the MAF sensor. Refer to «Mass Air Flow (MAF) Sensor Replacement»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2) .
2. Install the air cleaner assembly (1) by inserting the two rubber alignment grommets into the radiator core support behind the right headlight.
3. Install the air cleaner assembly attachment bolt (2). Tighten: Tighten the bolt to 10 N.m (89 lb in).
4. Connect the MAF sensor electrical connector.
5. Install the air cleaner intake duct. Refer to «Air Cleaner Intake Duct Replacement»(/chevrolet/equinox/i-2004-2009/remont/testing-diagnostics/#engine-controls-34l-introduction-2-of-2) .

Powertrain Control Module (PCM) Description

The powertrain control module (PCM) interacts with many emission related components and systems, and monitors emission related components and systems for deterioration. OBD II diagnostics monitor the system performance and a diagnostic trouble code (DTC) sets if the system performance degrades.

The malfunction indicator lamp (MIL) operation and the DTC storage are dictated by the DTC type. A DTC is ranked as a Type A or Type B if the DTC is emissions related. Type C is a non-emissions related DTC.

The PCM is in the engine compartment. The PCM is the control center of the engine controls system. The PCM controls the following components

1. The fuel injection system
2. The ignition system
3. The emission control systems
4. The on-board diagnostics
5. The A/C and fan systems

The PCM constantly monitors the information from various sensors and other inputs, and controls the systems that affect the vehicle performance and the emissions. The PCM also performs diagnostic tests on various parts of the system. The PCM can recognize operational problems and alert the driver via the MIL. When the PCM detects a malfunction, it stores a DTC. The condition is identified by the particular DTC that is set. This aids the technician in making repairs.

PCM Function

The powertrain control module (PCM) can supply 5 volts or 12 volts to the various sensors or switches. This is done through pull-up resistors to the regulated power supplies within the control module. In some cases, even an ordinary shop voltmeter will not give an accurate reading because the resistance is too low. Therefore, a DMM with at least 10 megaohms input impedance is required in order to ensure accurate voltage readings.

The PCM controls the output circuits by controlling the ground or the power feed circuit through the transistors or a device called an output driver module.

EEPROM

The electronically erasable programmable read only memory (EEPROM) is a permanent memory that is physically part of the control module. The EEPROM contains program and calibration information that the powertrain control module (PCM) needs in order to control the powertrain operation.

Special equipment, as well as the correct program and calibration for the vehicle, are required in order to reprogram the control module.

Data Link Connector (DLC)

The data link connector (DLC) is a 16-pin connector that provides the technician a means of accessing communication data for aid in the diagnosis. This connector allows the technician to use a scan tool in order to monitor the various parameters, and display the DTC information. The DLC is located inside of the drivers compartment, underneath the dash.

Malfunction Indicator Lamp (MIL) Operation

The malfunction indicator lamp (MIL) is located in the instrument panel cluster. The MIL will display as either SERVICE ENGINE SOON or one of the following symbols when commanded ON

Scheme 28

Scheme 29

The MIL indicates that an emissions related fault has occurred and vehicle service is required. The following is a list of the modes of operation for the MIL

1. The MIL illuminates when the ignition is turned ON, with the engine OFF. This is a bulb test to ensure that the MIL is able to illuminate.
2. The MIL turns OFF after the engine is started if a diagnostic fault is not present.
3. The MIL remains illuminated after the engine is started if the control module detects a fault. A DTC is stored any time the control module illuminates the MIL due to an emissions related fault. The MIL turns OFF after 3 consecutive ignition cycles in which a Test Passed has been reported for the diagnostic test that originally caused the MIL to illuminate.
4. The MIL flashes if the control module detects a misfire condition which could damage the catalytic converter.
5. When the MIL is illuminated and the engine stalls, the MIL will remain illuminated as long as the ignition is ON.
6. When the MIL is not illuminated and the engine stalls, the MIL will not illuminate until the ignition is cycled OFF and then ON.

PCM Service Precautions

The powertrain control module (PCM), by design, can withstand the normal current draws that are associated with the vehicle operations. However, care must be used in order to avoid overloading any of these circuits. When testing for opens or shorts, do not ground or apply voltage to any of the PCM circuits unless the diagnostic procedure instructs you to do so. These circuits should only be tested with a DMM.

Emissions Diagnosis For State I/M Programs

This OBD II equipped vehicle is designed to diagnose any conditions that could lead to excessive levels of the following emissions

1. Hydrocarbons (HC)
2. Carbon monoxide (CO)
3. Oxides of nitrogen (NOx)
4. Evaporative emission (EVAP) system losses

Should this vehicles on-board diagnostic system, powertrain control module (PCM), detect a condition that could result in excessive emissions, the PCM turns ON the malfunction indicator lamp (MIL) and stores a DTC that is associated with the condition.

Aftermarket (Add-On) Electrical And Vacuum Equipment

Note. Do not attach add-on vacuum operated equipment to this vehicle. The use of add-on vacuum equipment may result in damage to vehicle components or systems.

Note. Connect any add-on electrically operated equipment to the vehicle's electrical system at the battery (power and ground) in order to prevent damage to the vehicle.

Aftermarket, add-on, electrical and vacuum equipment is defined as any equipment installed on a vehicle after leaving the factory that connects to the vehicles electrical or vacuum systems. No allowances have been made in the vehicle design for this type of equipment.

Add-on electrical equipment, even when installed to these strict guidelines, may still cause the powertrain system to malfunction. This may also include equipment not connected to the vehicle electrical system, such as portable telephones and radios. Therefore, the first step in diagnosing any powertrain condition is to eliminate all of the aftermarket electrical equipment from the vehicle. After this is done, if the problem still exists, the problem may be diagnosed in the normal manner.

Electrostatic Discharge (ESD) Damage

The electronic components that are used in the control systems are often designed to carry very low voltage. The electronic components are susceptible to damage caused by electrostatic discharge. Less than 100 volts of static electricity can cause damage to some electronic components. By comparison, it takes as much as 4,000 volts for a person to even feel the effect of a static discharge.

There are several ways for a person to become statically charged. The most common methods of charging are by friction and by induction. An example of charging by friction is a person sliding across a car seat.

Charging by induction occurs when a person with well insulated shoes stands near a highly charged object and momentarily touches ground. Charges of the same polarity are drained off leaving the person highly charged with the opposite polarity. Static charges can cause damage, therefore, it is important to use care when handling and testing electronic components.

Emissions Control Information Label

The underhood Vehicle Emissions Control Information Label contains important emission specifications and setting procedures. In the upper left corner is the exhaust emission information. This identifies the year, the manufacturing division of the engine, the displacement of the engine in liters, the class of the vehicle, and type of fuel metering system. There is also an illustrated emission components and vacuum hose schematic.

This label is located in the engine compartment of every General Motors vehicle. If the label has been removed, it can be ordered from GM service parts operations (GMSPO).

Underhood Inspection

Perform a careful underhood inspection when performing any diagnostic procedure or diagnosing the cause of an emission test failure. This can often lead to repairing a condition without further steps. Use the following guidelines when performing an inspection

1. Inspect all of the vacuum hoses for correct routing, pinches, cuts, or disconnects.
2. Inspect any hoses that are difficult to see.
3. Inspect all of the wires in the engine compartment for the following conditions: Burned or chafed spots Pinched wires Contact with sharp edges Contact with hot exhaust manifolds

Basic Knowledge Required

Note. Lack of basic knowledge of this powertrain when performing diagnostic procedures could result in incorrect diagnostic performance or damage to powertrain components. Do not attempt to diagnose a powertrain problem without this basic knowledge.

A basic understanding of hand tools is necessary in order to effectively use this section of the Service Manual.

You must be familiar with some of the basics of engine operation and electrical diagnosis in order to use this section of the service manual.

1. Basic electrical circuits-You should have an understanding of basic electricity and know the meaning of voltage (volts), current (amps), and resistance (ohms). You should understand what happens in a circuit with an open or a shorted wire, and you should be able to identify a shorted or open circuit by using a DMM. You should be able to read and understand a wiring diagram.
2. Use of digital multimeter-You should be familiar with the DMM, particularly the essential tool. You should be able to use the meter in order to measure the voltage (volts), the resistance (ohms), the current (amps), intermittents (min/max), and frequency (Hertz).
3. Use of circuit testing tools-You should not use a test lamp to diagnose the engine controls system unless you are specifically instructed to do so. You should know how to the use jumper wires in order to test the components and allow the DMM readings without damaging the terminals. You should know how to use the J 35616 connector test adapter kit and use the kit whenever the diagnostic procedures call for front probing any connector.

Fuel System Overview

The Fuel System is a returnless on-demand design. The fuel pressure regulator is a part of the primary fuel tank module, eliminating the need for a return pipe from the engine. A returnless Fuel System reduces the internal temperature of the fuel tank by not returning hot fuel from the engine to the fuel tank. Reducing the internal temperature of the fuel tank results in lower evaporative emissions.

An electric turbine style fuel pump attaches to the primary fuel tank module inside the fuel tank. The fuel pump supplies high pressure fuel through the fuel filter, past the fuel pressure regulator, and through the fuel feed pipe to the Fuel Injection System. The fuel pressure regulator has a T-joint that diverts the needed fuel to the fuel rail with the unused fuel dropping back into the reservoir of the primary fuel tank module. The primary fuel tank module contains a reverse flow check valve. The check valve and the fuel pressure regulator maintain fuel pressure in the fuel feed pipe and the fuel rail in order to prevent long cranking times.

The primary fuel tank module also contains a primary jet pump and a secondary jet pump. Fuel pump flow loss, caused by vapor expulsion in the pump inlet chamber, is diverted to the primary jet pump and the secondary jet pump through a restrictive orifice located on the pump cover. The primary jet pump fills the reservoir of the primary fuel tank module. The secondary jet pump creates a venturi action which causes the fuel to be drawn from the secondary side of the fuel tank, through the fuel transfer pipe, to the primary side of the fuel tank.

Scheme 30

The fuel tank stores the fuel supply. The fuel tank is located in the rear of the vehicle. The fuel tank is held in place by 2 metal straps that attach to the under body of the vehicle. The fuel tank is molded from high-density polyethylene.

In order to provide space for a driveshaft though the center area of the tank, the fuel tank is a saddle configuration. Because of the saddle shape of the tank two fuel tank modules are required. The primary fuel tank module is located on the right side of the tank. The secondary fuel tank module is located on the left side of the tank.

Scheme 31

The fuel fill pipe has a built-in restrictor in order to prevent refueling with leaded fuel.

Fuel Filler Cap

Note. If a fuel tank filler cap requires replacement, use only a fuel tank filler cap with the same features. Failure to use the correct fuel tank filler cap can result in a serious malfunction of the fuel and EVAP system.

The fuel fill pipe has a tethered fuel filler cap. A torque-limiting device prevents the cap from being over-tightened. To install the cap, turn the cap clockwise until you hear audible clicks. This indicates that the cap is correctly torqued and fully seated. A fuel filler cap that is not fully seated may cause a malfunction in the Emission System.

Scheme 32

The primary fuel tank module is located inside of the right side of the fuel tank. The primary fuel tank module consists of the following major components

1. The fuel level sensor (4)
2. The fuel pump and reservoir assembly
3. The fuel strainer
4. The primary jet pump
5. The secondary jet pump
6. The fill limiter vent valve (6)
7. The fuel pressure sensor (1)
8. The fuel filter (3)
9. The fuel pressure regulator (5)
10. The fuel transfer pipe (2)

Scheme 33

The secondary fuel tank module is located inside of the left side of the fuel tank. The secondary fuel tank module consists of the following major components

1. The fuel level sensor (1)
2. The fuel pick-up (2)

Fuel Level Sensor

The fuel level sensor consists of a float, a wire float arm, and a ceramic resistor card. The position of the float arm indicates the fuel level. The fuel level sensor contains a variable resistor which changes resistance in correspondence with the position of the float arm. The control module sends the fuel level information via the CAN serial data to the body control module (BCM). The instrument panel cluster (IPC) displays the fuel level as determined by the BCM. This information is used for the IPC fuel gage and the low fuel warning indicator, if applicable. The control module also monitors the fuel level input for various diagnostics.

Scheme 34

The fuel pump (2) is mounted in the primary fuel tank module reservoir. The fuel pump is an electric high-pressure pump. Fuel is pumped to the fuel injection system at a specified flow and pressure. The fuel pump delivers a constant flow of fuel to the engine even during low fuel conditions and aggressive vehicle maneuvers. The control module controls the electric fuel pump operation through a fuel pump relay.

Scheme 35

The primary jet pump (1) is located in the primary fuel tank module. Fuel pump flow loss, caused by vapor expulsion in the pump inlet chamber, is diverted to the primary jet pump and the secondary jet pump (2) through a restrictive orifice located on the pump cover. The primary jet pump fills the reservoir of the primary fuel tank module.

Scheme 36

The secondary jet pump (1) creates a venturi action which causes the fuel to be drawn from the secondary side of the fuel tank, through the transfer pipe, to the primary side of the fuel tank.

Fuel Strainer

The fuel strainer attaches to the lower end of the primary fuel tank module. The fuel strainer is made of woven plastic. The functions of the fuel strainer are to filter contaminants and to wick fuel. The fuel strainer normally requires no maintenance. Fuel stoppage at this point indicates that the fuel tank contains an abnormal amount of sediment or contamination.

Fuel Filter

The fuel filter (1) is located in the primary fuel tank module. The paper filter element traps particles in the fuel that may damage the fuel injection system. The filter housing is made to withstand maximum fuel system pressure, exposure to fuel additives, and changes in temperature.

Fuel Pressure Regulator

The fuel pressure regulator is integrated into the fuel filter cover on the primary fuel tank module. The fuel pressure regulator uses a spring with a preset tension and a stainless steel ball inserted into a precision ground seat in order to regulate fuel pressure. This type of fuel pressure regulator is not serviceable.

Fuel Feed Pipes

The fuel feed pipe carries fuel from the fuel tank to the fuel injection system. The fuel pipe consists of 3 sections

1. The rear fuel pipe is located from the top of the fuel tank to the chassis fuel pipe. The rear fuel pipe is constructed of nylon.
2. The chassis fuel pipe is located under the vehicle and connects the rear fuel pipe to the engine compartment fuel pipe. The chassis fuel pipe is constructed of steel with a section of rubber hose.
3. The engine compartment fuel pipe connects the chassis fuel feed pipe to the fuel rail. The engine compartment fuel pipe is constructed of steel.

Nylon Fuel Pipes

Nylon pipes are constructed to withstand maximum fuel system pressure, exposure to fuel additives, and changes in temperature. The following 2 sizes of nylon pipes are used

1. 9.53 mm (3/8 in) ID for the fuel feed
2. 12.7 mm (1/2 in) ID for the vent

Heat resistant rubber hose or corrugated plastic conduit protect the sections of the pipes that are exposed to chafing, high temperature, or vibration.

Nylon fuel pipes are somewhat flexible and can be formed around gradual turns under the vehicle. However, if nylon fuel pipes are forced into sharp bends, the pipes kink and restrict the fuel flow. Also, once exposed to fuel, nylon pipes may become stiffer and are more likely to kink if bent too far. Take special care when working on a vehicle with nylon fuel pipes.

Quick-Connect Fittings

Quick-connect fittings provide a simplified means of installing and connecting fuel system components. The fittings consist of a unique female connector and a compatible male pipe end. O-rings, located inside the female connector, provide the fuel seal. Integral locking tabs inside the female connector hold the fittings together.

Fuel Pipe O-rings

O-rings seal the threaded connections in the fuel system. The fuel system O-ring seals are made of special material. Service the O-ring seals with the correct service part.

Scheme 37

The on-board refueling vapor recovery (ORVR) system is an on-board vehicle system designed to recover fuel vapors during the vehicle refueling operation. Instead of allowing fuel vapors to escape to the atmosphere the ORVR system transports the vapor to the evaporative emission (EVAP) canister for use by the engine. The flow of liquid fuel down the fuel filler neck provides a liquid seal that prevents fuel vapor from leaving the fuel system. The ORVR system architecture varies from platform to platform. Some of the items listed below are optional depending on the platform application. The following is a list of all the ORVR system components with a brief description of their operation

1. The EVAP canister (1). The EVAP canister receives and stores refueling vapor from the fuel system. The EVAP canister releases the fuel vapor to the engine through the EVAP control system.
2. The vapor lines (2). The vapor lines transport fuel vapor from the fuel tank assembly to the EVAP canister.
3. The vapor recirculation line (3), if equipped. The vapor recirculation line transports fuel vapor from the fuel tank to the top of the fuel filler pipe during refueling in order to reduce the fuel vapor at the canister. The vapor recirculation line can be located inside the fuel filler pipe or outside of the fuel filler pipe.
4. The variable orifice valve (4), if equipped. The variable orifice valve regulates the amount of vapor allowed to enter the vapor recirculation line.
5. The fuel filler pipe (5). The fuel filler pipe carries fuel from the fuel dispensing nozzle to the fuel tank.
6. The check valve (6). The check valve limits fuel spitback from the fuel tank during the refueling operation by allowing fuel flow only into the fuel tank. The check valve is located at the bottom of the fuel filler pipe or in the fuel tank filler neck.
7. The fuel sender assembly (7). The fuel sender assembly pumps fuel to the engine from the fuel tank.
8. The fill limiter vent valve (8). The fill limiter vent valve is located in the fuel tank and acts as a shut-off valve. The fill limiter vent valve performs the following functions: Controls the fuel tank fill level by closing the primary vent of the fuel tank. Prevents liquid fuel from exiting the fuel tank through the vapor line and entering the EVAP canister. Provides fuel-spillage protection in the event of a vehicle rollover by closing the vapor path from the tank to the EVAP canister.
9. The pressure/vacuum relief valve (9), if equipped. The pressure/vacuum relief valve provides venting of excessive fuel tank pressure or vacuum. The pressure/vacuum relief valve is located in the fuel filler neck on a plastic fuel tank and in the fill limiter vent valve on a steel fuel tank.

Fuel Rail Assembly

The fuel rail assembly attaches to the engine intake manifold. The fuel rail assembly performs the following functions

1. Positions the injectors in the intake manifold
2. Distributes fuel evenly to the injectors
3. Integrates the fuel pulse dampener into the fuel metering system

Scheme 38

The fuel injector assembly is a solenoid device controlled by the control module that meters pressurized fuel to a single engine cylinder. The control module energizes the high-impedance, 12 ohm, injector solenoid (4) to open a normally closed ball valve (1). This allows fuel to flow into the top of the injector, past the ball valve, and through a director plate (3) at the injector outlet. The director plate has machined holes that control the fuel flow, generating a spray of finely atomized fuel at the injector tip. Fuel from the injector tip is directed at the intake valve, causing the fuel to become further atomized and vaporized before entering the combustion chamber. This fine atomization improves fuel economy and emissions.

Fuel Metering Modes of Operation

The control module monitors voltages from several sensors in order to determine how much fuel to give the engine. The control module controls the amount of fuel delivered to the engine by changing the fuel injector pulse width. The fuel is delivered under one of several modes.

Starting Mode

When the ignition is first turned ON, the control module energizes the fuel pump relay for 2 seconds. This allows the fuel pump to build pressure in the fuel system. The control module calculates the air/fuel ratio based on inputs from the engine coolant temperature (ECT), manifold absolute pressure (MAP), and throttle position (TP) sensors. The system stays in starting mode until the engine speed reaches a predetermined RPM.

Clear Flood Mode

If the engine floods, clear the engine by pressing the accelerator pedal down to the floor and then crank the engine. When the TP sensor is at wide open throttle (WOT), the control module reduces the fuel injector pulse width in order to increase the air to fuel ratio. The control module holds this injector rate as long as the throttle stays wide open and the engine speed is below a predetermined RPM. If the throttle is not held wide open, the control module returns to the starting mode.

Run Mode

The run mode has 2 conditions called Open Loop and Closed Loop. When the engine is first started and the engine speed is above a predetermined RPM, the system begins Open Loop operation. The control module ignores the signal from the heated oxygen sensor (HO2S). The control module calculates the air/fuel ratio based on inputs from the ECT, MAP, and TP sensors. The system stays in Open Loop until meeting the following conditions

1. The HO2S has varying voltage output, showing that the HO2S is hot enough to operate properly.
2. The ECT sensor is above a specified temperature.
3. A specific amount of time has elapsed after starting the engine.

Specific values for the above conditions exist for this engine, and are stored in the electrically erasable programmable read-only memory (EEPROM). The system begins Closed Loop operation after reaching these values. In Closed Loop, the control module calculates the air/fuel ratio, injector ON time, based upon the signal from various sensors, but mainly from the HO2S. This allows the air/fuel ratio to stay very close to 14.7:1.

Acceleration Mode

When the driver pushes on the accelerator pedal, air flow into the cylinders increases rapidly. To prevent possible hesitation, the control module increases the pulse width to the injectors to provide extra fuel during acceleration. This is also known as power enrichment. The control module determines the amount of fuel required based upon the TP, the ECT, the MAP, and the engine speed.

Deceleration Mode

When the driver releases the accelerator pedal, air flow into the engine is reduced. The control module monitors the corresponding changes in the TP and the MAP. The control module shuts OFF fuel completely if the deceleration is very rapid, or for long periods, such as long, closed-throttle coast-down. The fuel shuts OFF in order to prevent damage to the catalytic converters.

Battery Voltage Correction Mode

When the battery voltage is low, the control module compensates for the weak spark delivered by the ignition system in the following ways

1. Increasing the amount of fuel delivered
2. Increasing the idle RPM
3. Increasing the ignition dwell time

Fuel Cutoff Mode

The control module cuts OFF fuel from the fuel injectors when the following conditions are met in order to protect the powertrain from damage and improve driveability

1. The ignition is OFF. This prevents engine run-on.
2. The ignition is ON but there is no ignition reference signal. This prevents flooding or backfiring.
3. The engine speed is too high, above red line.
4. The vehicle speed is too high, above rated tire speed.
5. During an extended, high speed, closed throttle coast down-This reduces emissions and increases engine braking.
6. During extended deceleration, in order to prevent damage to the catalytic converters

Fuel Trim

The control module controls the air/fuel metering system in order to provide the best possible combination of driveability, fuel economy, and emission control. The control module monitors the HO2S signal voltage while in Closed Loop and regulates the fuel delivery by adjusting the pulse width of the injectors based on this signal. The ideal fuel trim (FT) values are around 0 percent for both short and long term FT. A positive FT value indicates the control module is adding fuel in order to compensate for a lean condition by increasing the pulse width. A negative FT value indicates that the control module is reducing the amount of fuel in order to compensate for a rich condition by decreasing the pulse width. A change made to the fuel delivery changes the long and short term FT values. The short term FT values change rapidly in response to the HO2S signal voltage. These changes fine tune the engine fueling. The long term FT makes coarse adjustments to fueling in order to re-center and restore control to short term FT. A scan tool can be used to monitor the short and long term FT values. The long term FT diagnostic is based on an average of several of the long term speed load learn cells. The control module selects the cells based on the engine speed and engine load. If the control module detects an excessively lean or rich condition, the control module will set a FT DTC.

EVAP System Operation

The evaporative emission (EVAP) control system limits fuel vapors from escaping into the atmosphere. Fuel tank vapors are allowed to move from the fuel tank, due to pressure in the tank, through the vapor pipe, into the EVAP canister. Carbon in the canister absorbs and stores the fuel vapors. Excess pressure is vented through the vent line and EVAP vent valve to atmosphere. The EVAP canister stores the fuel vapors until the engine is able to use them. At an appropriate time, the control module will command the EVAP purge valve ON, open, allowing engine vacuum to be applied to the EVAP canister. With the EVAP vent valve OFF, open, fresh air will be drawn through the valve and vent line to the EVAP canister. Fresh air is drawn through the canister, pulling fuel vapors from the carbon. The air/fuel vapor mixture continues through the EVAP purge pipe and EVAP purge valve into the intake manifold to be consumed during normal combustion. The control module uses several tests to determine if the EVAP system is leaking.

Large Leak Test

This tests for large leaks and blockages in the evaporative emission (EVAP) system. The control module will command the EVAP vent valve ON, closed, and command the EVAP purge valve ON, open, with the engine running, allowing engine vacuum into the EVAP system. The control module monitors the fuel tank pressure (FTP) sensor voltage to verify that the system is able to reach a predetermined level of vacuum within a set amount of time. The control module then commands the EVAP purge valve OFF, closed, sealing the system and monitors the vacuum level for decay. If the control module does not detect that the predetermined vacuum level was achieved, or the vacuum decay rate is more than a calibrated level on 2 consecutive tests, DTC P0455 sets.

Small Leak Test

The engine off natural vacuum, (EONV), diagnostic is the small leak detection diagnostic for the evaporative emission (EVAP) system. The EONV diagnostic monitors the EVAP system pressure or vacuum with the key OFF. The EONV utilizes the temperature changes and the resulting naturally occurring vacuum or pressure in the fuel tank immediately following a drive cycle. When the vehicle is driven, the temperature in the fuel tank rises. When the vehicle is parked with the engine OFF and key OFF, the temperature in the fuel tank will continue to rise for a period of time, and then begin to decrease. The EONV diagnostic relies on this temperature change, and the corresponding pressure change to determine if an EVAP system leak is present. The EONV diagnostic is designed to detect leaks as small as 0.51 mm (0.020 in). The diagnostic can determine if a small leak is present based on vacuum or pressure readings in the EVAP system. When the EVAP system is sealed a finite amount of pressure or vacuum will be observed. When a 0.51 mm (0.020 in) leak is present, little or no pressure or vacuum is observed. If the test reports a failing value, DTC P0442 will set.

Canister Vent Restriction Test

If the evaporative emission (EVAP) vent system is restricted, fuel vapors will not be properly purged from the EVAP canister. The control module tests this by commanding the EVAP purge valve ON, open; and commanding the EVAP vent valve OFF, open; and monitoring the fuel tank pressure (FTP) sensor for an increase in vacuum. If vacuum increases more than a calibrated value, DTC P0446 sets.

Purge Valve Leak Test

If the evaporative emission (EVAP) purge valve does not seal properly, fuel vapors could enter the engine at an undesired time, causing driveability concerns. The control module tests for this by commanding the EVAP purge valve OFF, closed; and vent valve ON, closed; sealing the system, and monitoring the fuel tank pressure (FTP) for an increase in vacuum. If the control module detects that EVAP system vacuum increases above a calibrated value, DTC P0496 sets.

EVAP System Components

The evaporative emission (EVAP) system consists of the following components

EVAP Canister

The canister is filled with carbon pellets used to absorb and store fuel vapors. Fuel vapor is stored in the canister until the control module determines that the vapor can be consumed in the normal combustion process.

EVAP Purge Valve

The EVAP purge valve controls the flow of vapors from the EVAP system to the intake manifold. This normally closed valve is pulse width modulated (PWM) by the control module to precisely control the flow of fuel vapor to the engine. The valve will also be opened during some portions of the EVAP testing, allowing engine vacuum to enter the EVAP system.

EVAP Vent Valve

The EVAP vent valve controls fresh airflow into the EVAP canister. The valve is normally open. The control module will command the valve closed during some EVAP tests, allowing the system to be tested for leaks.

Fuel Tank Pressure Sensor

The fuel tank pressure (FTP) sensor measures the difference between the pressure or vacuum in the fuel tank and outside air pressure. The control module provides a 5-volt reference and a ground to the FTP sensor. The FTP sensor provides a signal voltage back to the control module that can vary between 0.1-4.9 volts. As FTP increases, FTP sensor voltage decreases, high pressure, = low voltage. As FTP decreases, FTP sensor voltage increases low pressure or vacuum = high voltage.

EVAP Service Port

The EVAP service port is located in the EVAP purge pipe between the EVAP purge valve and the EVAP canister. The service port is identified by a green colored cap.

Electronic Ignition (EI) System Operation

The electronic ignition (EI) system produces and controls the high energy secondary spark. This spark ignites the compressed air/fuel mixture at precisely the correct time, providing optimal performance, fuel economy, and control of exhaust emissions. The powertrain control module (PCM) primarily collects information from the crankshaft position (CKP) and camshaft position (CMP) sensors to control the sequence, dwell, and timing of the spark.

Crankshaft Reluctor Wheel

The crankshaft reluctor wheel is mounted in the middle of the crankshaft. The wheel is comprised of three 120 degree segments. Each segment represents a pair of cylinders at top dead center (TDC), and is further divided into six 20-degree segments. Within each 20-degree segment is a notch of 2 different sizes. Each 120 degree segment has a unique pattern of notches. This is known as pulse width encoding. This pulse width encoding pattern allows the powertrain control module (PCM) to quickly recognize which pair of cylinders are at TDC. The reluctor wheel is also a dual track, or mirror image, design. This means there is an additional wheel pressed against the first wheel with a gap of equal size to each notch of the mating wheel. When one sensing element of the crankshaft position (CKP) sensor is reading a notch, the other is reading a set of teeth. The resulting signals are then converted into a digital square wave output by the circuitry within the CKP sensor.

Crankshaft Position (CKP) Sensor

The crankshaft position (CKP) sensor is a 3-wire sensor based on the magneto resistive principle. A magneto resistive sensor uses 2 magnetic pickups between a permanent magnet. As an element such as a reluctor wheel passes the magnets, the resulting change in the magnetic field is used by the sensor electronics to produce a digital output pulse. The CKP sensor returns a digital ON/OFF pulse 24 times per crankshaft revolution. The pulse width encoding pattern is used to synchronize the coil firing sequence with the crankshaft position. The CKP sensor is used for ignition timing, fuel injector timing, misfire diagnostics, and tachometer display. The powertrain control module (PCM) supplies a 12-volt reference, a low reference, and a medium resolution engine speed signal circuit to the CKP sensor.

Camshaft Position (CMP) Sensor

The camshaft position (CMP) sensor signal is a digital ON/OFF pulse output once per revolution of the camshaft. The CMP sensor does not directly affect the operation of the ignition system. The CMP sensor information is used by the powertrain control module (PCM) to determine the position of the valve train relative to the crankshaft position. By monitoring the CMP and crankshaft position (CKP) signals, the PCM can accurately time the operation of the fuel injectors. The PCM supplies the sensor with a 12-volt reference circuit, a low reference circuit, and a signal circuit.

Knock Sensor (KS)

The knock sensor (KS) system enables the control module to control the ignition timing for the best possible performance while protecting the engine from potentially damaging levels of detonation. The control module uses the KS system to test for abnormal engine noise that may indicate detonation, also known as spark knock.

The KS system uses one or 2 flat response 2-wire sensors. The sensor uses piezo-electric crystal technology that produces an AC voltage signal of varying amplitude and frequency based on the engine vibration or noise level. The amplitude and frequency are dependent upon the level of knock that the KS detects. The control module receives the KS signal through a signal circuit. The KS ground is supplied by the control module through a low reference circuit.

The control module learns a minimum noise level, or background noise, at idle from the KS and uses calibrated values for the rest of the RPM range. The control module uses the minimum noise level to calculate a noise channel. A normal KS signal will ride within the noise channel. As engine speed and load change, the noise channel upper and lower parameters will change to accommodate the normal KS signal, keeping the signal within the channel. In order to determine which cylinders are knocking, the control module only uses KS signal information when each cylinder is near top dead center (TDC) of the firing stroke. If knock is present, the signal will range outside of the noise channel.

If the control module has determined that knock is present, it will retard the ignition timing to attempt to eliminate the knock. The control module will always try to work back to a zero compensation level, or no spark retard. An abnormal KS signal will stay outside of the noise channel or will not be present. KS diagnostics are calibrated to detect faults with the KS circuitry inside the control module, the KS wiring, or the KS voltage output. Some diagnostics are also calibrated to detect constant noise from an outside influence such as a loose/damaged component or excessive engine mechanical noise.

Ignition Control Module (ICM)/Coils

There are 3 dual-tower ignition coils that are part of the ignition control module (ICM). The ICM contains coil driver circuits that command the coils to operate. The ICM has the following circuits

1. An ignition voltage circuit
2. A ground circuit
3. An IC 1 control circuit for the 1-4 ignition coil
4. An IC 2 control circuit for the 2-5 ignition coil
5. An IC 3 control circuit for the 3-6 ignition coil
6. A low reference circuit

The powertrain control module (PCM) controls each dual-tower ignition coil by transmitting timing pulses on the ignition control (IC) circuit to the ICM for the proper coil to enable a spark event.

The spark plugs are connected to each coil tower by spark plug wires. The spark plug wires conduct the spark energy from the coil to the spark plug. The spark plug electrode is tipped with platinum for long wear and higher efficiency.

Powertrain Control Module (PCM)

The powertrain control module (PCM) controls all ignition system functions, and constantly corrects the basic spark timing. The PCM monitors information from various sensor inputs that include the following

1. The throttle position (TP) sensor
2. The engine coolant temperature (ECT) sensor
3. The mass air flow (MAF) sensor
4. The intake air temperature (IAT) sensor
5. The vehicle speed sensor (VSS)
6. The transmission gear position or range information sensors
7. The engine knock sensor (KS)

Modes of Operation

There is one normal mode of operation with the spark under powertrain control module (PCM) control. If the crankshaft position (CKP) pulses are lost, the engine will not run. The loss of a camshaft position (CMP) signal may result in a longer crank time since the PCM cannot determine which stroke the pistons are on. Diagnostic trouble codes are available to accurately diagnose the ignition system with a scan tool.

Purpose

The throttle actuator control (TAC) system delivers improved throttle response and greater reliability and eliminates the need for mechanical cable. The TAC system performs the following functions

1. Accelerator pedal position (APP) sensing
2. Throttle positioning to meet driver and engine demands
3. Throttle position sensing
4. Internal diagnostics
5. Cruise control functions
6. Manage TAC electrical power consumption

The TAC system includes the following components

1. The APP sensors
2. The throttle body assembly
3. The powertrain control module (PCM)

Accelerator Pedal Position (APP) Sensor

The accelerator pedal contains 2 individual accelerator pedal position (APP) sensors within the assembly. The APP sensors 1 and 2 are potentiometer type sensors each with 3 circuits

1. A 5-volt reference circuit
2. A low reference circuit
3. A signal circuit

The APP sensors are used to determine the pedal angle. The powertrain control module (PCM) provides each APP sensor with a 5-volt reference circuit and a low reference circuit. The APP sensors provide the PCM with signal voltage proportional to the pedal movement. Both APP sensor signal voltages are low at rest position and increase as the pedal is applied.

Throttle Body Assembly

The throttle assembly contains the following components

1. The throttle blade
2. The throttle actuator motor
3. The throttle position (TP) sensor 1 and 2
4. The throttle actuator control (TAC) module

The throttle body functions similar to a conventional throttle body with the following exceptions

1. There is no longer an idle air control (IAC) motor and associated air passages.
2. An electric motor opens and closes the throttle valve.
3. The TAC module is located within the throttle body assembly.
4. The throttle blade is spring loaded in both directions and the default position is slightly open.
5. There are 2 individual TP sensors within the throttle body assembly.

The TP sensors are used to determine the throttle plate angle. The TP sensors provide the powertrain control module (PCM) with a signal voltage proportional to throttle plate movement. Both TP sensor signal voltages are low at closed throttle and increase as the throttle opens.

Throttle Actuator Control Module

The throttle actuator control (TAC) module is the control center for the TAC system. The TAC system uses electronically erasable programmable read only memory (EEPROM) and is self-diagnosing. The TAC module provides diagnostic information to the powertrain control module (PCM) through a dedicated serial data line. The TAC achieves throttle positioning by providing a pulse width modulated (PWM) voltage to the TAC motor as directed by the PCM. The TAC module is not serviced and should be replaced with the throttle body assembly.

Powertrain Control Module

The powertrain control module (PCM) determines the drivers intent and then calculates the appropriate throttle response. This information is sent to the throttle actuator control (TAC) module through a dedicated serial data line.

Normal Mode

During the operation of the throttle actuator control (TAC) system, several modes or functions are considered normal. The following modes may be entered during normal operation

1. Minimum pedal value-At key-up, the powertrain control module (PCM) updates the learned minimum pedal value.
2. Minimum throttle position (TP) values-At key-up, the PCM updates the learned minimum throttle position value. In order to learn the minimum throttle position value, the throttle blade is moved to the closed position.
3. Ice break mode-If the throttle is not able to reach a predetermined minimum throttle position, the ice break mode is entered. During the ice break mode, the PCM commands the maximum pulse width several times to the throttle actuator motor in the closing direction.
4. Battery saver mode-After a predetermined time without engine RPM, the PCM commands the battery saver mode. During the battery saver mode, the TAC module removes the voltage from the motor control circuits, which removes the current draw used to maintain the idle position and allows the throttle to return to the spring loaded default position.

Reduced Engine Power Mode

When the PCM detects a condition with the TAC system, the PCM may enter a reduced engine power mode. Reduced engine power may cause one or more of the following conditions

1. Acceleration limiting-The PCM will continue to use the accelerator pedal for throttle control, however the vehicle acceleration is limited.
2. Limited throttle mode-The PCM will continue to use the accelerator pedal for throttle control however the maximum throttle opening is limited.
3. Throttle default mode-The PCM will turn off the throttle actuator motor and the throttle will return to the spring loaded default position.
4. Forced idle mode-The PCM will perform the following actions: Limit engine speed to idle by positioning the throttle, or by controlling the fuel and spark if the throttle is turned off. Ignore the accelerator pedal input.
5. Engine shutdown mode-The PCM will disable fuel and de-energize the throttle actuator.

Exhaust Gas Recirculation (EGR) System

The exhaust gas recirculation (EGR) system is used to reduce the amount of nitrogen oxide (NOx) emission levels caused by combustion temperatures exceeding 816°C (1,500°F). It does this by introducing small amounts of exhaust gas back into the combustion chamber. The exhaust gas absorbs a portion of the thermal energy produced by the combustion process and thus decreases combustion temperature. The EGR system will only operate under specific temperature, barometric pressure (BARO) and engine load conditions in order to prevent driveability concerns and to increase engine performance.

Scheme 39

The linear exhaust gas recirculation (EGR) valve consists of the following

1. The EGR valve position sensor
2. The EGR valve position sensor cap
3. The bobbin and coil assembly
4. The valve pintle
5. The primary pole piece
6. The armature sleeve
7. The armature and base assembly
8. The exhaust gas inlet port
9. The exhaust gas outlet port

Linear EGR Control

The linear exhaust gas recirculation (EGR) valve is controlled by a high side driver within the powertrain control module (PCM). This high side driver uses a 12-volt pulse width modulated (PWM) signal. The ground path for the EGR valve is completed by turning in a separate driver within the PCM. The PCM calculates the amount of EGR needed based on the following inputs

1. The engine coolant temperature (ECT) sensor
2. The intake air temperature (IAT) sensor
3. The barometric pressure (BARO)
4. The manifold absolute pressure (MAP) sensor
5. The throttle position (TP) sensor
6. The mass air flow (MAF) sensor

EGR Diagnostics

The powertrain control module (PCM) tests the exhaust gas recirculation (EGR) flow during deceleration by momentarily commanding the EGR valve to open while monitoring the signal of the manifold absolute pressure (MAP) sensor. When the EGR valve is opened, the PCM will expect to see a predetermined increase in MAP. If the expected increase in MAP is not detected, the PCM records the amount of MAP difference that was detected and adjusts a calibrated fail counter towards a calibrated fail threshold level. When the fail counter exceeds the fail threshold level, the PCM will set a DTC.

Normally, the PCM will only allow one EGR Flow Test Count during an ignition cycle. To aid in verifying a repair, the PCM allows 18 EGR Flow Test Counts during the first ignition cycle following a code clear or a battery disconnect. Between 9-18 EGR Flow Test Counts should be sufficient for the PCM to determine adequate EGR flow and pass the EGR flow test. If the PCM detects an EGR flow error, a DTC will set.

The PCM monitors the position of the EGR valve pintle via the EGR position sensor. If the PCM detects a calibrated variance between the Desired EGR Position parameter and the EGR Position Sensor parameter, actual position, for a calibrated amount of time a DTC will set.

The PCM also monitors the EGR solenoid high control circuit and the EGR solenoid low control circuit for electrical faults. If an EGR control circuit fault is detected for a calibrated amount of time a DTC will set.

Special Tools

Special Tools Illustration Tool Number/ Description GE 41415-50 Fuel Tank Cap Adapter J 26792 HEI Spark Tester J 34730-1A Fuel Pressure Gage J-34730-262 Fuel Pressure Test Gage Adapter J 35616 GM-Approved Terminal Test Kit J 37088-A Fuel Line Disconnect Tool Set J 37287 Fuel Line Shut-Off Adapters J 38522 Variable Signal Generator J 39765-A Fuel Sender Lock Ring Tool J 41413 EVAP Pressure and Purge Station J 41413-200 Evaporative Emissions System Tester (EEST) J 41413-SPT High Intensity White Light J 41413-VLV EVAP Service Port Vent Fitting J 41415-40 Fuel Tank Cap Adapter J 42960-2 Fuel Flapper Door Holder J 44175 Fuel Composition Tester J 45004 Fuel Tank Drain Hose J 45722 Fuel Sender Lock Ring Wrench

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Scheme 50

Scheme 51

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Scheme 55

See also:
• DTC P0016
• DTC P0220
• DTC P0496
• DTC U0107
• Battery Negative Cable Disconnect/Connect Procedure
• Control Module References
• Diagnostic Trouble Code (DTC) List - Vehicle
• Draining and Filling Cooling System (Static Fill)
• Component Fastener Tightening Notice
• Fastener Notice
• Lifting and Jacking the Vehicle
• Closeout/Insulator Panel Replacement - Left
• Gasoline/Gasoline Vapors Caution
• Fuel and Evaporative Emission (EVAP) Hose/Pipe Connection Cleaning Notice
• Safety Glasses Caution
• Relieving Fuel Pressure Caution
• Fuel Pipe Fitting Caution
• Fuel Pump Electrical Circuit Diagnosis
• Exhaust System Replacement
• Propeller Shaft Replacement
• Tire and Wheel Removal and Installation
• Wheelhouse Liner Panel Replacement - Rear
• Air Cleaner Intake Duct Replacement
• Special Tools
• Fuel Tank Draining Procedure
• Ignition System Specifications
• Fastener Tightening Specifications