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Engine Control System & Fuel System - Hybrid (hp2) 6.0l (lz1) - Repair Instructions Cadillac Escalade GMT900

Testing & Diagnostics 4 illustrations ~15130 words

Engine Control Module Replacement

Service of the engine control module (ECM) should consist of either replacement of the ECM or programming of the electrically erasable programmable read only memory (EEPROM). If the diagnostic procedures call for the ECM to be replaced, the replacement ECM should be checked to ensure that the correct part is being used. If the correct part is being used, remove the faulty ECM and install the new service ECM.

CAUTIONTurn the ignition OFF when installing or removing the control module connectors and disconnecting or reconnecting the power to the control module (battery cable, powertrain control module (PCM)/engine control module (ECM)/transaxle control module (TCM) pigtail, control module fuse, jumper cables, etc.) in order to prevent internal control module damage. Control module damage may result when the metal case contacts battery voltage. DO NOT contact the control module metal case with battery voltage when servicing a control module, using battery booster cables, or when charging the vehicle battery. In order to prevent any possible electrostatic discharge damage to the control module, do no touch the connector pins or the soldered components on the circuit board. Remove any debris from around the control module connector surfaces before servicing the control module. Inspect the control module connector gaskets when diagnosing or replacing the control module. Ensure that the gaskets are installed correctly. The gaskets prevent contaminant intrusion into the control module. The replacement control module must be programmed.

Note. It is necessary to record the remaining engine oil life. If the replacement module is not programmed with the remaining engine oil life, the engine oil life will default to 100 percent. If the replacement module is not programmed with the remaining engine oil life, the engine oil will need to be changed at 5 000 km (3,000 mi) from the last oil change.

Removal Procedure

  1. Using a scan tool, retrieve the percentage of remaining engine oil. Record the remaining engine oil life.
  2. Disconnect the negative battery cable. Refer to «Battery Negative Cable Disconnection and Connection»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#battery-charging-system-and-starting-system) .
  3. Disengage the engine wiring harness electrical connector retainers and remove the connectors (2) from the ECM (1).
  4. Disengage the bracket retainer tabs (1) securing the ECM to the bracket.
  5. Remove the ECM (3) from the bracket.

Installation Procedure

  1. Set the bottom of ECM into the ECM bracket tab (2).
  2. Push the ECM (3) in securing the ECM to the bracket.
  3. Position the engine wiring harness electrical connectors and engage the retainers securing the connectors (2) to the ECM (1).
  4. Connect the negative battery cable. Refer to «Battery Negative Cable Disconnection and Connection»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#battery-charging-system-and-starting-system) .
  5. If a NEW ECM was installed, program the ECM. Refer to «Control Module References»(/cadillac/escalade/gmt900-2006-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) .

Crankshaft Position System Variation Learn

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

Note. The ECM monitors certain component signals to determine if all the conditions are met to continue with the crankshaft position System Variation Learn Procedure.

  1. Monitor the engine control module (ECM) for DTCs with a scan tool. If other DTCs are set, except DTC P0315, refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) for the applicable DTC that set.
  2. Select the crankshaft position (CKP) variation learn procedure with a scan tool.
  3. The scan tool instructs you to perform the following: IMPORTANT: Close the hood. IMPORTANT: The engine must be at operating temperature. Block drive wheels. Set parking brake. Apply and hold brake pedal. IMPORTANT: The engine may autostop and will restart as needed. IMPORTANT: The vehicle must remain in PARK. Start the engine.
  4. Enable the CKP System Variation Learn Procedure with a scan tool.
  5. Quickly apply and release the accelerator pedal.
  6. Test in progress.
  7. The scan tool displays Learn Status: Learned this ignition.
  8. Once the Learn Procedure has successfully completed, and in order to store the crankshaft position system variation values in the ECM, turn OFF the ignition and verify all vehicle systems are OFF. This may take up to 2 minutes.

Description

The engine control module (ECM) learns the airflow through the throttle body to ensure the correct idle. The learned airflow values are stored within the ECM. These values are learned to adjust for production variation and will continuously learn during the life of the vehicle to compensate for reduced airflow due to throttle body coking. Anytime the throttle body airflow rate changes, for example due to cleaning or replacing, the values must be relearned.

An engine that had a heavily coked throttle body that has been cleaned or replaced may take several drive cycles to learn out the coking. To accelerate the process, the scan tool has the ability to reset all learned values back to zero. A new ECM will also have values set to zero.

The idle may be unstable or a DTC may set if the learned values do not match the actual airflow.

Conditions for Running the Throttle Learn Procedure

Reset Procedure

  1. DTCs P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0116, P0117, P0118, P0120, P0122, P0123, P0128, P0171, P0172, P0174, P0175, P0201, P0202, P0203, P0204, P0205, P0206, P0220, P0222, P0223, P0300, P0351, P0352, P0353, P0496, P0601, P0604, P0606, P060D, P0641, P0651, P1516, P2101, P2119, P2120, P2122, P2123, P2125, P2127, P2128, P2135, P2138, or P2176 are not set.
  2. Ignition ON, engine OFF.
  3. The vehicle speed sensor (VSS) is 0 km/h (0 mph).

Learn Procedure

  1. DTCs P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0116, P0117, P0118, P0120, P0122, P0123, P0128, P0171, P0172, P0174, P0175, P0201, P0202, P0203, P0204, P0205, P0206, P0220, P0222, P0223, P0300, P0351, P0352, P0353, P0496, P0601, P0604, P0606, P060D, P0641, P0651, P1516, P2101, P2119, P2120, P2122, P2123, P2125, P2127, P2128, P2135, P2138, or P2176 are not set.
  2. The engine speed is between 450-4,000 RPM.
  3. The manifold absolute pressure (MAP) is greater than 5 kPa.
  4. The mass air flow (MAF) is greater than 2 g/s.
  5. The ignition voltage is greater than 10 volts.

Throttle Learn

Reset Procedure (Performed after the throttle body is cleaned or replaced)

  1. Ignition ON, engine OFF, perform the Idle Learn Reset in Module Setup with a scan tool.
  2. Start the engine and monitor the TB Idle Airflow Compensation parameter. The TB Idle Airflow Compensation value should equal 0 percent and the engine should be idling at a normal idle speed.
  3. Clear the DTCs and return to the diagnostic that referred you here.

Learn Procedure (Performed after the ECM is flashed or replaced)

  1. Start and idle the engine for 3 minutes.
  2. With a scan tool, monitor the Desired Idle Speed and the actual Engine Speed.
  3. The ECM will start to learn the new idle cells and Desired Idle Speed should start to decrease.
  4. Ignition OFF for 60 seconds.
  5. Start and idle the engine for 3 minutes.
  6. After the 3 minute run time the engine should be idling normal. NOTE: During the drive cycle the check engine light may come on with idle speed DTCs. If idle speed codes are set, clear codes so the ECM can continue to learn. If the engine idle speed has not been learned the vehicle will need to be driven at speeds above 70 km/h (44 mph) with several decelerations and extended idles.
  7. After the drive cycle, the engine should be idling normally. If the engine idle speed has not been learned, turn OFF the ignition for 60 seconds and repeat step 6.
  8. Once the engine speed has returned to normal, clear DTCs and return to the diagnostic that referred you here.
CAUTIONUse care when handling the coolant sensor. Damage to the coolant sensor will affect the operation of the fuel control system.
  1. Drain the cooling system to a level below the engine cooling temperature (ECT) sensor. Refer to «Cooling System Draining and Filling (Static Fill)»(/cadillac/escalade/gmt900-2006-2014/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-and-filling-static) .
  2. Disconnect the engine wiring harness electrical connector (2) from the ECT sensor (1).
  3. Remove the ECT sensor.
CAUTIONReplacement components must be the correct part number for the application. Components requiring the use of the thread locking compound, lubricants, corrosion inhibitors, or sealants are identified in the service procedure. Some replacement components may come with these coatings already applied. Do not use these coatings on components unless specified. These coatings can affect the final torque, which may affect the operation of the component. Use the correct torque specification when installing components in order to avoid damage.
CAUTIONUse care when handling the coolant sensor. Damage to the coolant sensor will affect the operation of the fuel control system.
  1. If installing the old sensor, coat the threads with sealant GM P/N 12346004 (Canadian P/N 10953480) or equivalent.
  2. Install the ECT sensor. Tighten: Tighten the sensor to 20 N.m (15 lb ft).
  3. Connect the engine wiring harness electrical connector (2) to the ECT sensor (1).
  4. Refill the cooling. Refer to «Cooling System Draining and Filling (Static Fill)»(/cadillac/escalade/gmt900-2006-2014/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-and-filling-static) .

Scheme 33

Scheme 33: Mass Airflow Sensor with Intake Air Temperature Sensor Replacement
Scheme 33: Mass Airflow Sensor with Intake Air Temperature Sensor Replacement
CalloutComponent Name
1Mass Airflow Sensor Screw (Qty: 2) CAUTION: Refer to Fastener Caution . Tighten: 1.5 N.m(13 lb in)
2Mass Airflow Sensor/Intake Air Temperature Sensor Procedure: Disconnect the electrical connector.
CAUTION
Refer to Fastener Caution .
  1. Remove the intake manifold sight shield. Refer to «Upper Intake Manifold Sight Shield Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/mechanical/#engine-mechanical-53l-60l-62l-repair-instructions-on-vehicle) .
  2. Disconnect the engine wiring harness electrical connector (1) from the manifold absolute pressure (MAP) sensor (4).
  3. Remove the MAP sensor retainer.
  4. Remove the MAP sensor.
IMPORTANTLightly coat the MAP sensor seal with clean engine oil before installing the sensor.
  1. Install the MAP sensor.
  2. Install the MAP sensor retainer.
  3. Connect the engine harness wiring electrical connector (4) to the MAP sensor (1).
  4. Install the intake manifold sight shield. Refer to «Upper Intake Manifold Sight Shield Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/mechanical/#engine-mechanical-53l-60l-62l-repair-instructions-on-vehicle) .

Scheme 34

Scheme 34: Barometric Pressure Sensor Replacement
Scheme 34: Barometric Pressure Sensor Replacement
CalloutComponent Name
Preliminary Procedure: Remove the upper intake manifold sight shield. Refer to Upper Intake Manifold Sight Shield Replacement .
1Bolt CAUTION: Refer to Fastener Caution . Tighten: 10 N.m (89 lb in)
2Retainer
3Barometric Pressure Sensor Procedure Disconnect the BARO sensor harness connector. Remove the BARO sensor from the intake manifold.
CAUTION
Refer to Fastener Caution .

Scheme 35

Scheme 35: Throttle Inlet Absolute Pressure Sensor Replacement
Scheme 35: Throttle Inlet Absolute Pressure Sensor Replacement
CalloutComponent Name
1Throttle Inlet Absolute Pressure Sensor Fastener CAUTION: Refer to Fastener Caution . Tighten: 3 N.m(27 lb in)
2Throttle Inlet Absolute Pressure Sensor
CAUTION
Refer to Fastener Caution .
  1. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#general-information__lifting-and-jacking-the-vehicle) .
  2. Unbolt the front propeller shaft from the front differential, if equipped with four wheel drive (4WD). Refer to «Front Propeller Shaft Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/driveshaft-universal-joints/#propeller-shaft-and-universal-joints) .
  3. Remove the connector position assurance (CPA) retainer (4).
  4. Disconnect the engine wiring harness electrical connector (7) from the HO2S.
  5. Remove the HO2S electrical connector clip (6) from the fuel line clip.
  6. Remove the HO2S (1).

Note. A special anti-seize compound is used on the HO2S threads. The compound consists of liquid graphite and glass beads. The graphite tends to burn away, but the glass beads remain, making the sensor easier to remove. New, or service replacement sensors already have the compound applied to the threads. If the sensor is removed from an exhaust component and if for any reason the sensor is to be reinstalled, the threads must have anti-seize compound applied before the reinstallation.

  1. If reinstalling the old sensor, coat the threads with anti-seize compound GM P/N 12377953, or equivalent.
  2. Install the HO2S (1). Tighten: Tighten the sensor to 42 N.m (31 lb ft).
  3. Connect the engine wiring harness electrical connector (7) to the HO2S.
  4. Install the engine wiring harness electrical connector clip (6) to the fuel line clip.
  5. Install the CPA retainer (4).
  6. Install the front propeller shaft to the front differential, if equipped with 4WD. Refer to «Front Propeller Shaft Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/driveshaft-universal-joints/#propeller-shaft-and-universal-joints) .
  7. Lower the vehicle.
  1. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#general-information__lifting-and-jacking-the-vehicle) .
  2. If equipped with 2 wheel drive (2WD) perform the following steps, if equipped with 4 wheel drive (4WD) proceed to step 5.
  3. Remove the connector position assurance (CPA) retainer (2).
  4. Disconnect the HO2S electrical connector (3) from the engine wiring harness electrical connector (5).
  5. Remove the connector position assurance (CPA) retainer (2).
  6. Disconnect the HO2S electrical connector (4) from the engine wiring harness electrical connector (3).
  7. Remove the HO2S (4).

Note. A special anti-seize compound is used on the HO2S threads. The compound consists of liquid graphite and glass beads. The graphite tends to burn away, but the glass beads remain, making the sensor easier to remove. New, or service replacement sensors already have the compound applied to the threads. If the sensor is removed from an exhaust component and if for any reason the sensor is to be reinstalled, the threads must have anti-seize compound applied before the reinstallation.

  1. If reinstalling the old sensor, coat the threads with anti-seize compound GM P/N 12377953, or equivalent.
  2. Install the HO2S (4). Tighten: Tighten the sensor to 42 N.m (31 lb ft).
  3. If equipped with 4WD perform the following steps, if equipped with 2WD proceed to step 6.
  4. Connect the HO2S electrical connector (4) to the engine wiring harness electrical connector (3).
  5. Install the CPA retainer (2).
  6. Connect the HO2S electrical connector (3) to the engine wiring harness electrical connector (5).
  7. Install the CPA retainer (2).
  8. Lower the vehicle.
  1. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#general-information__lifting-and-jacking-the-vehicle) .
  2. Remove the connector position assurance (CPA) retainer (3).
  3. Disconnect the engine wiring harness electrical connector (2) from the HO2S electrical connector (1).
  4. Remove the HO2S clip from the engine wiring harness clip (4).
  5. Remove the HO2S (2).

Note. A special anti-seize compound is used on the HO2S threads. The compound consists of liquid graphite and glass beads. The graphite tends to burn away, but the glass beads remain, making the sensor easier to remove. New, or service replacement sensors already have the compound applied to the threads. If the sensor is removed from an exhaust component and if for any reason the sensor is to be reinstalled, the threads must have anti-seize compound applied before the reinstallation.

  1. If reinstalling the old sensor, coat the threads with anti-seize compound GM P/N 12377953, or equivalent.
  2. Install the HO2S (2). Tighten: Tighten the sensor to 42 N.m (31 lb ft).
  3. Connect the engine wiring harness electrical connector (2) to the HO2S electrical connector (1).
  4. Install the CPA retainer (3).
  5. Install the HO2S clip to the engine wiring harness clip (4).
  6. Lower the vehicle.
  1. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#general-information__lifting-and-jacking-the-vehicle) .
  2. Remove the connector position assurance (CPA) retainer (5).
  3. Disconnect the HO2S electrical connector (7) from the engine wiring harness electrical connector (6).
  4. Remove the HO2S (3).

Note. A special anti-seize compound is used on the HO2S threads. The compound consists of liquid graphite and glass beads. The graphite tends to burn away, but the glass beads remain, making the sensor easier to remove. New, or service replacement sensors already have the compound applied to the threads. If the sensor is removed from an exhaust component and if for any reason the sensor is to be reinstalled, the threads must have anti-seize compound applied before the reinstallation.

  1. If reinstalling the old sensor, coat the threads with anti-seize compound GM P/N 12377953, or equivalent.
  2. Install the HO2S (3). Tighten: Tighten the sensor to 42 N.m (31 lb ft).
  3. Connect the HO2S electrical connector (7) to the engine wiring harness electrical connector (6).
  4. Install the CPA retainer (5).
  5. Lower the vehicle.
CAUTIONHandle the electronic throttle control components carefully. Use cleanliness in order to prevent damage. Do not drop the electronic throttle control components. Do not roughly handle the electronic throttle control components. Do not immerse the electronic throttle control components in cleaning solvents of any type.
  1. Remove the knee bolster. Refer to «Knee Bolster Replacement (Cadillac)»(/cadillac/escalade/gmt900-2006-2014/remont/exteriorinterior-trim/#instrument-panel-trim-and-console-trim) or «Knee Bolster Replacement (Except Cadillac)»(/cadillac/escalade/gmt900-2006-2014/remont/exteriorinterior-trim/#instrument-panel-trim-and-console-trim) .
  2. Push down the small tab and disconnect the accelerator pedal position (APP) sensor electrical connector (1).
  3. Remove the accelerator pedal bolts.
  4. Remove the accelerator pedal.
  1. Position the accelerator pedal to the accelerator pedal bracket.
  2. Install the accelerator pedal bolts. Tighten: Tighten the bolts to 9 N.m (80 lb in).
  3. Connect the APP sensor electrical connector (1).
  4. Connect a scan tool to the diagnostic port in order to test for proper throttle-opening and throttle-closing range.
  5. Operate the accelerator pedal and monitor the throttle angles. The accelerator pedal should operate freely, without binding, between a closed throttle, and a wide open throttle (WOT).
  6. Verify that the vehicle meets the following conditions: The vehicle is not in a reduced engine power mode. The ignition is ON. The engine is OFF.
  7. Install the knee bolster. Refer to «Knee Bolster Replacement (Cadillac)»(/cadillac/escalade/gmt900-2006-2014/remont/exteriorinterior-trim/#instrument-panel-trim-and-console-trim) or «Knee Bolster Replacement (Except Cadillac)»(/cadillac/escalade/gmt900-2006-2014/remont/exteriorinterior-trim/#instrument-panel-trim-and-console-trim) .
  1. Remove the air cleaner outlet duct. Refer to «Air Cleaner Resonator Outlet Duct Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) .
  2. Disconnect the engine wiring harness electrical connector (2) from the electronic throttle control.
  3. Remove the throttle body nuts (507) and bolts (538).
  4. Remove the throttle body (508).
  5. Remove and discard the throttle body gasket (509).
  1. Install a NEW throttle body gasket to the intake manifold. Align the tab of the gasket with the notch in the manifold.
  2. Install the throttle body (508), bolts (538), and nuts (507). Tighten: Tighten the bolts/nuts to 10 N.m (89 lb in).
  3. Connect the engine wiring harness electrical connector (2) to the electronic throttle control.
  4. Install the air cleaner outlet duct. Refer to «Air Cleaner Resonator Outlet Duct Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) .
  5. Connect a scan tool in order to test for proper throttle-opening and throttle-closing range.
  6. Operate the accelerator pedal and monitor the throttle angles. The accelerator pedal should operate freely, without binding, between a closed throttle, and a wide open throttle (WOT).
  7. Verify that the vehicle meets the following conditions: The vehicle is not in a reduced engine power mode. The ignition is ON. The engine is OFF.
  8. Start the engine.
  9. Inspect for coolant leaks.
  10. Perform the throttle learn procedure. Refer to «Throttle/Idle Learn»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-53l-60l-62l-repair-instructions) .

Throttle Body Cleaning

  1. Remove the air cleaner outlet duct. Refer to «Air Cleaner Resonator Outlet Duct Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) .
  2. Inspect the throttle body bore and the throttle plate for deposits. You will need to open the throttle plate in order to inspect all surfaces.
  3. Clean the throttle body bore and the throttle plate using a clean shop towel with GM Top Engine Cleaner, P/N 1052626, or ACDelco Carburetor Tune-Up Conditioner, P/N X66-P, or an equivalent product.
  4. Install the air cleaner outlet duct. Refer to «Air Cleaner Resonator Outlet Duct Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) .
  5. Perform the throttle learn procedure. Refer to «Throttle/Idle Learn»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-53l-60l-62l-repair-instructions) .

Fuel Pressure Relief (Without CH 48027)

  1. If the fuel system requires repair, prevent fuel spillage by removing the fuel pump fuse. Refer to «Electrical Center Identification Views»(/cadillac/escalade/gmt900-2006-2014/remont/electrical-component-locations/#wiring-systems-and-power-management-component-locator-electrical-center-identification-views) .
  2. Loosen the fuel fill cap in order to relieve the fuel tank vapor pressure.
  3. Remove the engine cover, if required.
  4. Remove the fuel rail service port cap.
  5. Wrap a shop towel around the fuel rail service port and using a small flat-bladed tool, depress (open) the fuel rail test port valve.
  6. Remove the shop towel from around the fuel rail service port, and place in an approved gasoline container.
  7. Install the fuel rail service port cap.
  8. Install the engine cover, if required.
  9. Tighten the fuel fill cap.

Special Tools

CH-48027 Digital Pressure Gauge

WARNINGRemove the fuel tank cap and relieve the fuel system pressure before servicing the fuel system in order to reduce the risk of personal injury. After you relieve the fuel system pressure, a small amount of fuel may be released when servicing the fuel lines, the fuel injection pump, or the connections. In order to reduce the risk of personal injury, cover the fuel system components with a shop towel before disconnection. This will catch any fuel that may leak out. Place the towel in an approved container when the disconnection is complete.
  1. Relieve the fuel system pressure. Refer to «Fuel Pressure Relief (Without CH 48027)»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions__fuel-pressure-relief-without-ch-48027) .
  2. Connect the CH-48027-1 (1) to the CH-48027-2 (2).
  3. Remove the shop towel from around the fuel rail service port, and place in an approved gasoline container.
  4. Perform any tests and/or diagnostics as needed. For the proper usage of the CH-48027 , refer to the manufacture's directions.
  1. Relieve the fuel system pressure, if required. Perform the following steps: WARNING: Wrap a shop towel around the fuel pressure connection in order to reduce the risk of fire and personal injury. The towel will absorb any fuel leakage that occurs during the connection of the fuel pressure gauge. Place the towel in an approved container when the connection of the fuel pressure gauge is complete. Wrap a shop towel around the fuel rail service port. Place the hose on the CH-48027-2 (2) into an approved gasoline container. Open the valve on the CH-48027-2 (2) in order to bleed any fuel from the fuel rail. Close the valve on the CH-48027-2 (2). Remove the hose on the CH-48027-2 (2) from the approved gasoline container. Remove the shop towel from around the fuel rail service port, and place in an approved gasoline container.
  2. Disconnect the CH-48027-1 (1) from the CH-48027-2 (2).
  3. Disconnect the CH-48027-2 (2) from the CH-48027-3 (4).
  4. Disconnect the CH-48027-3 (4) from the fuel rail service port.
  5. Install the fuel rail service port cap.
  6. Tighten the fuel fill cap.

J 41769 Fuel Line Quick Disconnect Tool

Disconnect Procedure

  1. Relieve the fuel system pressure. Refer to «Fuel Pressure Relief (Without CH 48027)»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions__fuel-pressure-relief-without-ch-48027) .
  2. Remove the fuel line retainer.
  3. Using compressed air, blow any dirt or debris from around the connection.
  4. Using the correct tool from the J 41769 , insert the tool into the female connector end, then push inward in order to release the quick connect locking tabs.
  5. Pull the fuel line connection apart.
  6. Use a clean shop towel in order to wipe off the male connection end.
  7. Inspect both ends of the fitting for dirt and burrs. Clean or replace the components as required.

Connect Procedure

  1. Apply a few drops of clean engine oil to the male connection end.
  2. Push both sides of the fitting together in order to engage the retaining tabs.
  3. Once installed, pull on both sides of the connection in order to ensure the connection is secure.
  4. Install the fuel line retainer.
  1. Relieve the fuel system pressure. Refer to «Fuel Pressure Relief (Without CH 48027)»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions__fuel-pressure-relief-without-ch-48027) .
  2. Using compressed air, blow any dirt or debris from around the connection.
  3. This step applies to Bartholomew style connector ONLY. Squeeze the plastic quick connect fitting release tabs.
  4. This step applies to Release Tab style connector ONLY. Release the fitting by pushing the tab toward the other side of the slot in the fitting.
  5. This step applies to the Squeeze to Release style connector ONLY. Squeeze where indicated by the arrows shown above on both sides of the plastic ring surrounding the quick connect fitting.
  6. This step applies to the Sliding Retainer style connector ONLY. Release the fitting by pressing on one side of the release tab causing it to push in slightly. If the tab does not move try pressing the tab in from the opposite side. The tab will only move in one direction.
  7. This step applies to the Push Down TI style connector ONLY. Release the fitting by pressing on the tab indicated by the arrow.
  8. 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 connection in order to make sure the connection is secure.
  1. Raise and suitably support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#general-information__lifting-and-jacking-the-vehicle) .
  2. Remove the electronic brake control module (EBCM) shield retainers (2).
  3. Remove the EBCM shield bolts (3) and shield (1).
  4. Disconnect the chassis wiring harness electrical connector (1) from the fuel pump flow control module.
  5. Loosen the fuel pump flow control module bolts (1).
  6. Slide the fuel pump flow control module (2) towards the passenger side of the vehicle.
  7. Remove the fuel pump flow control module from the vehicle.
  1. Position the fuel pump flow control module (2) to the vehicle.
  2. Slide the fuel pump flow control module towards the driver side of the vehicle.
  3. Tighten the fuel pump flow control module bolts (1). Tighten: Tighten the bolts to 9 N.m (80 lb in).
  4. Connect the chassis wiring harness electrical connector (1) to the fuel pump flow control module.
  5. Position the EBCM shield (1) to the underbody and install the EBCM shield bolts (3). Tighten: Tighten the bolts to 20 N.m (15 lb ft).
  6. Install the EBCM shield retainers (2).
  7. Lower the vehicle.
  8. Program the fuel pump flow control module. Refer to «Control Module References»(/cadillac/escalade/gmt900-2006-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) .

Fuel Tank Draining

  1. Loosen the fuel fill cap in order to relieve the fuel tank vapor pressure.
  2. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#general-information__lifting-and-jacking-the-vehicle) .
  3. Loosen the fuel fill hose clamp (1).
  4. Remove the fuel fill hose from the fuel tank.
  5. Insert the hose from the pump devise into the fuel tank.
  6. Using a hand or air operated pump device, drain as much fuel from the tank as possible.

Note. Clean the fuel connections and surrounding areas prior to disconnecting the lines in order to avoid possible contamination.

  1. Remove the fuel fill cap.
  2. Remove the fuel tank filler housing to body TORX® screws (1) and retainer (2).
  3. Remove the spare tire stowage lock cylinder, if necessary.
  4. Remove the spare tire, if necessary.
  5. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#general-information__lifting-and-jacking-the-vehicle) .
  6. Remove the rear axle vent hose clip (1) from the fill pipe.
  7. If necessary, remove the air suspension hose at the fill pipe.
  8. Remove the chassis wiring harness ground bolt (2).
  9. Remove the left rear lamp ground wire (4) and fill pipe ground strap (5) from the frame.
  10. Loosen the fuel fill hose clamp (1).
  11. Remove the fuel fill hose from the fuel tank.
  12. Loosen the fuel fill pipe vent hose clamp (2) at the fuel tank vent valve.
  13. Disconnect the fuel fill pipe vent line quick connect fitting (3) from the evaporative emission (EVAP) canister vent solenoid valve. Refer to «Plastic Collar Quick Connect Fitting Service»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) .
  14. Remove the fuel fill pipe bracket bolts (2, 4).
  15. Cap the fuel tank opening and EVAP vent line in order to prevent fuel/EVAP system contamination.
  16. Remove the fuel fill pipe assembly.
  17. If replacing any serviceable part of the fill pipe assembly proceed to the disassemble procedure, otherwise proceed to the installation procedure.

Disassemble

  1. Fuel tank filler vent hose (1)
  2. Fuel tank fill pipe housing bolts (2)
  3. Fuel tank fill pipe housing (3)
  4. Fuel tank fill hose (4)
  5. Fuel tank fill pipe clip (5)
  6. Fuel tank fill hose clamp (6)
  7. Fuel tank fill hose (7)
  8. Fuel tank fill hose clamp (8)
  9. Evaporative emission hose (9)
  10. Evaporative emission hose clamp (10)

Assemble

  1. Evaporative emission hose clamp (10) Tighten: Tighten the clamp to 2.5 N.m (22 lb in).
  2. Evaporative emission hose (9)
  3. Fuel tank fill hose clamp (8) Tighten: Tighten the clamp to 2.5 N.m (22 lb in).
  4. Fuel tank fill hose (7)
  5. Fuel tank fill hose clamp (6) Tighten: Tighten the clamp to 2.5 N.m (22 lb in).
  6. Fuel tank fill pipe clip (5)
  7. Fuel tank fill hose (4)
  8. Fuel tank fill pipe housing (3)
  9. Fuel tank fill pipe housing bolts (2) Tighten: Tighten the bolts to 2.3 N.m (20 lb in).
  10. Fuel tank filler vent hose (1)
  1. Remove the caps from the fuel tank opening and the EVAP vent line.
  2. Install the fuel fill hose to the fuel tank. Ensure that the notch in the hose is aligned with the notch on the fuel tank.
  3. Install the fuel fill pipe vent hose to the fuel tank vent valve.
  4. Install the tab (1) on the fuel fill pipe to the notch in the frame.
  5. Install the fuel fill pipe bracket bolts (2, 4). Tighten: Tighten the bolt to 12 N.m (106 lb in).
  6. Connect the fuel fill pipe vent line quick connect fitting (3) to the EVAP canister vent solenoid valve. Refer to «Plastic Collar Quick Connect Fitting Service»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) .
  7. Tighten the fuel fill hose clamp (1). Tighten: Tighten the clamp to 2.5 N.m (22 lb in).
  8. Tighten the fuel fill pipe vent hose clamp (2) at the fuel tank vent valve. Tighten: Tighten the clamp to 2.5 N.m (22 lb in).
  9. Position the fill pipe ground strap (5) to the left rear lamp ground wire (4).
  10. Install the rear lamp ground wire (4) and ground strap (5) to the frame. Insert the lamp ground wire anti-rotation tab into the hole in the frame.
  11. Install the chassis wiring harness ground bolt. Tighten: Tighten the bolt to 9 N.m (80 lb in).
  12. If necessary, install the air suspension hose at the fill pipe.
  13. Install the rear axle vent hose clip (1) to the fill pipe.
  14. Lower the vehicle.
  15. Install the fuel tank filler housing to body TORX® screws (1) and retainer (2). Tighten: Tighten the screws to 2.3 N.m (20 lb in).
  16. Install the spare tire, if necessary.
  17. Install the spare tire stowage lock cylinder, if necessary.
  18. Install the fuel fill cap.

J 45722 Fuel Sender Lock Ring Wrench

Note. Clean the fuel and evaporative emission (EVAP) connections and surrounding areas prior to disconnecting the lines in order to avoid possible system contamination.

  1. Relieve the fuel system pressure. Refer to «Fuel Pressure Relief (Without CH 48027)»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions__fuel-pressure-relief-without-ch-48027) .
  2. Drain the fuel tank. Refer to «Fuel Tank Draining»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions__fuel-tank-draining) .
  3. Loosen the fuel fill pipe vent hose clamp (2) at the fuel tank vent valve.
  4. Disconnect the chassis EVAP line quick connect fitting (4) from the fuel tank line. Refer to «Plastic Collar Quick Connect Fitting Service»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) .
  5. Disconnect the fuel tank fuel feed line quick connect fitting (5) from the chassis line. Refer to «Plastic Collar Quick Connect Fitting Service»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) .
  6. Cap the fuel and EVAP lines in order to prevent possible fuel and/or EVAP system contamination.
  7. Disconnect the fuel tank EVAP lines (1) from the EVAP canister. Refer to «Plastic Collar Quick Connect Fitting Service»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) .
  8. Cap the EVAP lines in order to prevent possible EVAP system contamination.
  9. Using an adjustable jack, support the fuel tank.
  10. Remove the fuel tank strap bolts.
  11. Remove the fuel tank straps.
  12. With the aid of an assistant, carefully lower the rear of the fuel tank.
  13. Slide the front of the tank away from the frame.
  14. Lower the fuel tank slightly until the chassis wiring harness electrical connectors can be accessed.
  15. Disengage the chassis wiring harness electrical connector, connector position assurance (CPA) retainer at the module.
  16. Disconnect the chassis wiring harness electrical connectors (1) from the module and the fuel pressure sensor.
  17. Completely lower the fuel tank.
  18. With the aid of an assistant, place the fuel tank in a suitable work area.
  19. If replacing the fuel tank proceed to the next step, otherwise proceed to step 18 in the installation procedure.
  20. Remove the fuel feed line from the retaining feature (2) in the fuel tank.
  21. Open the fuel/EVAP line clip (1) and remove the fuel feed line from the clip.
  22. Disconnect the fuel feed line quick connect fitting at the fuel tank module. Refer to «Plastic Collar Quick Connect Fitting Service»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) .
  23. Remove the fuel feed line from the fuel tank.
  24. Remove the fuel tank shield retainers (2 and 3) and shields (1 and 4).
  25. Remove the EVAP line from the fuel tank clips (2 and 6).
  26. Open the fuel tank clips (1, 3, 4, and 5) and remove the EVAP lines from the clips.
  27. Disconnect the EVAP line quick connect fittings at the fuel tank module and fuel tank vent valve. Refer to «Plastic Collar Quick Connect Fitting Service»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) .
  28. Remove the EVAP lines from the fuel tank.
  29. Using the J 45722 , remove the lock ring.
  30. Carefully lift the module from the fuel tank, enough to access the quick connect fittings (1) under the module cover. Disconnect the quick connect fittings. Refer to «Plastic Collar Quick Connect Fitting Service»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) .
  31. Remove the fuel tank module.
  32. Remove and discard the fuel tank module seal.
  33. Place the lock ring on a flat surface. Measure the clearance between the lock ring and the flat surface using a feeler gauge at 7 points.
  34. If warpage is less than 0.41 mm (0.016 in), the lock ring does not require replacement.
  35. If warpage is greater than 0.41 mm (0.016 in), the lock ring must be replaced.
  1. If the fuel tank was replaced perform the following steps, otherwise proceed to step 18.
  2. Install the NEW fuel tank module seal onto the fuel tank.
  3. Pull the vent lines in the fuel tank up as far as possible for ease of installation.
  4. Position the fuel tank module part way into the fuel tank.
  5. Connect the quick connect fittings (1) to the module cover. Refer to «Plastic Collar Quick Connect Fitting Service»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) .
  6. Install the fuel tank module into the fuel tank.
  7. Place the lock ring into position.
  8. Rotate the lock ring counterclockwise using the J 45722 .
  9. Install the EVAP lines to the fuel tank.
  10. Connect the EVAP line quick connect fittings at the fuel tank module and fuel tank vent valve. Refer to «Plastic Collar Quick Connect Fitting Service»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) .
  11. Install the EVAP lines to the fuel tank clips (1, 3, 4, and 5) and close the clips.
  12. Install the EVAP line to the fuel tank clips (2 and 6).
  13. Install the fuel tank shields (1 and 4) and retainers (2 and 3).
  14. Install the fuel feed line to the fuel tank.
  15. Connect the fuel feed line quick connect fitting at the fuel tank module. Refer to «Plastic Collar Quick Connect Fitting Service»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) .
  16. Install the fuel feed line to the clip (1) and close the clip.
  17. Install the fuel feed line to the retaining feature (2) in the fuel tank.
  18. Place the fuel tank onto a suitable jack.
  19. With the aid of an assistant, partially raise the fuel tank until the electrical connections can be made.
  20. Connect the chassis wiring harness electrical connectors (1) to the fuel tank module and fuel pressure sensor.
  21. Engage the chassis harness electrical connector CPA retainer at the module electrical connector.
  22. Completely raise the fuel tank.
  23. Install the fuel tank straps.
  24. Install the fuel tank strap bolts. Tighten: Tighten the bolts to 40 N.m (30 lb ft).
  25. Remove the adjustable jack from the fuel tank.
  26. Remove the caps from the EVAP lines.
  27. Connect the fuel tank EVAP lines (1) to the EVAP canister. Refer to «Plastic Collar Quick Connect Fitting Service»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) .
  28. Remove the caps from the fuel and EVAP lines.
  29. Connect the chassis EVAP line quick connect fitting (4) to the fuel tank line. Refer to «Plastic Collar Quick Connect Fitting Service»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) .
  30. Connect the fuel tank fuel feed line quick connect fitting (5) to the chassis line. Refer to «Plastic Collar Quick Connect Fitting Service»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) .
  31. Install the fuel fill pipe vent hose to the fuel tank vent valve.
  32. Tighten the fuel fill pipe vent hose clamp (2) at the fuel tank vent valve. Tighten: Tighten the clamp to 2.5 N.m (22 lb in).
  33. Install the fuel fill hose to the fuel tank. Ensure that the notch in the hose is aligned with the notch on the fuel tank.
  34. Tighten the fuel fill hose clamp (1). Tighten: Tighten the clamp to 2.5 N.m (22 lb in).
  35. Lower the vehicle.
  36. Refill the fuel tank.
  37. Install the fuel fill cap.
  38. Connect the negative battery cable. Refer to «Battery Negative Cable Disconnection and Connection»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#battery-charging-system-and-starting-system) .
  39. Use the following procedure in order to inspect for leaks: Turn the ignition ON, with the engine OFF, for 2 seconds. Turn the ignition OFF for 10 seconds. Turn the ignition ON, with the engine OFF. Inspect for fuel leaks.
  40. Install the intake manifold sight shield. Refer to «Upper Intake Manifold Sight Shield Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/mechanical/#engine-mechanical-53l-60l-62l-repair-instructions-on-vehicle) .
  1. Remove the fuel tank. Refer to «Fuel Tank Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) .
  2. Using a slight rocking motion while pulling straight up, remove the fuel tank pressure sensor (1).
  1. Install the fuel tank pressure sensor (1).
  2. Install the fuel tank. Refer to «Fuel Tank Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) .

J 45722 Fuel Sender Lock Ring Wrench

  1. Remove the fuel tank. Refer to «Fuel Tank Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) .
  2. Disconnect fuel and evaporative emission (EVAP) lines from the fuel tank module. Refer to «Plastic Collar Quick Connect Fitting Service»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) .
  3. Using the J 45722 and a long breaker bar, rotate the ring clockwise unlocking the fuel tank module lock ring.
  4. Remove the lock ring.
  5. Carefully lift the module from the fuel tank enough to access the quick connect fittings (1) under the module cover. Disconnect the quick connect fittings. Refer to «Plastic Collar Quick Connect Fitting Service»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) .
  6. Remove the fuel tank module.
  7. Remove and discard the fuel tank module seal.
  8. Place the lock ring on a flat surface. Measure the clearance between the lock ring and the flat surface using a feeler gauge at 7 points.
  9. If warpage is less than 0.41 mm (0.016 in), the lock ring does not require replacement.
  10. If warpage is greater than 0.41 mm (0.016 in), the lock ring must be replaced.
  1. Install the NEW fuel tank module seal onto the fuel tank.
  2. Pull the vent lines in the fuel tank up as far as possible for ease of installation.
  3. Position the fuel tank module part way into the fuel tank.
  4. Connect the quick connect fittings (1) to the module cover. Refer to «Plastic Collar Quick Connect Fitting Service»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) .
  5. Install the fuel tank module into the fuel tank.
  6. Place the lock ring into position.
  7. Rotate the lock ring counterclockwise using the J 45722 until fully seated.
  8. Connect the fuel and EVAP lines to the fuel tank module. Refer to «Plastic Collar Quick Connect Fitting Service»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) .
  9. Install the fuel tank. Refer to «Fuel Tank Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) .
  1. Remove the fuel tank module. Refer to «Fuel Tank Fuel Pump Module Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) .
  2. Using a small pick like tool, push in the retainer (1) in order to disengage the electrical connector.
  3. Remove the fuel level sensor electrical connector from the module cover.
  4. Push the level sensor locking tangs (2) in towards the inside of the module bucket.
  5. Slide the fuel level sensor up.
  6. Remove the fuel level sensor from the module.
  1. Install the fuel level sensor to the module.
  2. Position and slide the fuel level sensor down.
  3. Ensure that the level sensor tangs (2) are engaged at the bucket.
  4. Install the fuel level sensor electrical connector to the module cover.
  5. Ensure that the retainer (1) engaged the module cover.
  6. Install the fuel tank module. Refer to «Fuel Tank Fuel Pump Module Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) .

Note. Clean all fuel and evaporative emission (EVAP) lines connections and surrounding areas prior to disconnecting the lines in order to avoid possible fuel and/or EVAP system contamination.

  1. Remove the intake manifold sight shield. Refer to «Upper Intake Manifold Sight Shield Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/mechanical/#engine-mechanical-53l-60l-62l-repair-instructions-on-vehicle) .
  2. Relieve the fuel system pressure. Refer to the «Fuel Pressure Relief (Without CH 48027)»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions__fuel-pressure-relief-without-ch-48027) .
  3. Disconnect the engine evaporative emission (EVAP) line (1) quick connect fitting from the chassis EVAP line. Refer to «Plastic Collar Quick Connect Fitting Service»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) .
  4. Disconnect the fuel feed line quick connect fitting (2) from the fuel rail. Refer to «Metal Collar Quick Connect Fitting Service»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) .
  5. Cap the fuel rail and EVAP pipes.
  6. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#general-information__lifting-and-jacking-the-vehicle) .
  7. Remove the transfer case. Refer to «Transfer Case Assembly Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/transfer-case/#transfer-case-bw-4485-nr3) or «Transfer Case Assembly Replacement»(ref-364539-S24625579642010063000000) .
  8. Disconnect the chassis wiring harness electrical connector (1) from the fuel pressure sensor (2).
  9. Remove the engine wiring harness clip (4) from the fuel pipe bracket (3).
  10. Remove the transmission and the fuel pipe bracket nut from the bellhousing stud.
  11. Remove the fuel line clip from the bracket on the automatic transmission.
  12. If equipped with 4-wheel drive (4WD), remove the fuel hose/pipe clip from the bracket on the transfer case.
  13. Disconnect the range selector cable from the transmission range selector lever. Refer to «Range Selector Lever Cable Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/automatic-trans/#automatic-transmission-6l456l506l806l90-repair-instructions-on-vehicle) .
  14. Remove the hybrid brake pressure modulator valve. Refer to «Brake Pressure Modulator Valve Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/anti-locktraction-control/#antilock-brake-system-hybrid-hp2-with-electronic-brake-distribution-vehicle-stability-system) .
  15. Remove the fuel line bracket bolt (3).
  16. Disconnect the chassis EVAP line quick connect fitting (4) from the fuel tank line. Refer to «Plastic Collar Quick Connect Fitting Service»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) .
  17. Disconnect the fuel tank fuel feed line quick connect fitting (5) from the chassis line. Refer to «Plastic Collar Quick Connect Fitting Service»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) .
  18. Cap the fuel and EVAP lines in order to prevent possible fuel and/or EVAP system contamination.
  19. Remove the fuel/EVAP line clips from the frame and crossmember.
  20. Remove the fuel line bracket locator tab from the frame.
  21. Remove the fuel/EVAP lines from the vehicle.
  1. Install the fuel/EVAP lines to the vehicle.
  2. Install the fuel line bracket locator tab to the frame.
  3. Install the fuel/EVAP line clips to the frame and crossmember.
  4. Install the fuel line bracket bolt (3). Tighten: Tighten the bolt to 12 N.m (106 lb in).
  5. Remove the caps from the fuel and EVAP lines.
  6. Connect the chassis EVAP line quick connect fitting (4) to the fuel tank line. Refer to «Plastic Collar Quick Connect Fitting Service»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) .
  7. Connect the fuel tank fuel feed line quick connect fitting (5) to the chassis line. Refer to «Plastic Collar Quick Connect Fitting Service»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) .
  8. If equipped with 4WD, install the fuel hose/pipe clip to the bracket on the transfer case.
  9. Install the fuel line clip to the bracket on the automatic transmission.
  10. Install the fuel pipe bracket nut to the bellhousing stud. Tighten: Tighten the nut to 20 N.m (15 lb ft).
  11. Install the hybrid brake pressure modulator valve. Refer to «Brake Pressure Modulator Valve Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/anti-locktraction-control/#antilock-brake-system-hybrid-hp2-with-electronic-brake-distribution-vehicle-stability-system) .
  12. Install the transfer case. Refer to «Transfer Case Assembly Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/transfer-case/#transfer-case-bw-4485-nr3) or «Transfer Case Assembly Replacement»(ref-364539-S24625579642010063000000) .
  13. Connect the chassis wiring harness electrical connector (1) to the fuel pressure sensor (2).
  14. Connect the engine wiring harness clip (4) to the fuel pipe bracket (3).
  15. Lower the vehicle.
  16. Remove the caps from the fuel rail and EVAP line.
  17. Connect the engine EVAP line (1) quick connect fitting to the chassis EVAP line. Refer to «Plastic Collar Quick Connect Fitting Service»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) .
  18. Connect the fuel feed line quick connect fitting (2) to the fuel rail. Refer to «Metal Collar Quick Connect Fitting Service»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) .
  19. Install the fuel fill cap.
  20. Connect the negative battery cable. Refer to «Battery Negative Cable Disconnection and Connection»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#battery-charging-system-and-starting-system) .
  21. Use the following procedure in order to inspect for leaks: Turn the ignition ON, with the engine OFF, for 2 seconds. Turn the ignition OFF for 10 seconds. Turn the ignition ON, with the engine OFF. Inspect for fuel leaks.
  22. Install the intake manifold sight shield. Refer to «Upper Intake Manifold Sight Shield Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/mechanical/#engine-mechanical-53l-60l-62l-repair-instructions-on-vehicle) .
  1. If equipped with 4 wheel drive (4WD), remove the front propeller shaft. Refer to «Front Propeller Shaft Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/driveshaft-universal-joints/#propeller-shaft-and-universal-joints) .
  2. Disconnect the chassis wiring harness electrical connector (1) from the fuel pressure sensor (2).
  3. Wrap a shop towel around the fuel pressure sensor fitting in order to absorb any fuel that may leak out.
  4. Remove the fuel pressure sensor (1) from the fuel line.
  5. Remove and discard the fuel pressure sensor O-ring seal (2).
  1. Lubricate a NEW fuel pressure sensor O-ring seal with clean engine oil.
  2. Install the NEW fuel pressure sensor O-ring seal (2) onto the fuel line fitting.
  3. Wrap a shop towel around the fuel pressure sensor fitting in order to absorb any fuel that may leak out.
  4. Install the fuel pressure sensor (1) to the fuel line. Tighten: Tighten the sensor to 15 N.m (11 lb ft).
  5. Connect the chassis wiring harness electrical connector (1) to the fuel pressure sensor (2).
  6. Lower the vehicle.
  7. Use the following procedure in order to inspect for leaks: Turn the ignition ON, with the engine OFF, for 2 seconds. Turn the ignition OFF for 10 seconds. Turn the ignition ON, with the engine OFF. Inspect for fuel leaks.
  8. If equipped with 4WD, install the front propeller shaft. Refer to «Front Propeller Shaft Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/driveshaft-universal-joints/#propeller-shaft-and-universal-joints) .
IMPORTANTClean the fuel feed line connection and surrounding area prior to disconnecting the fitting in order to avoid possible fuel system contamination.
  1. Remove the fuel tank. Refer to «Fuel Tank Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) .
  2. Remove the fuel feed line from the retaining feature (2) in the fuel tank.
  3. Open the fuel/evaporative emission (EVAP) line clip (1) and remove the fuel feed line from the clip.
  4. Disconnect the fuel feed line quick connect fitting at the fuel tank module. Refer to «Plastic Collar Quick Connect Fitting Service»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) .
  5. Remove the fuel feed line from the fuel tank.
  6. Cap the fuel feed port on the fuel tank module in order to prevent possible fuel system contamination.
  1. Install the fuel feed line to the fuel tank.
  2. Remove the cap from the fuel feed port on the fuel tank module.
  3. Connect the fuel feed line quick connect fitting at the fuel tank module. Refer to «Plastic Collar Quick Connect Fitting Service»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) .
  4. Install the fuel feed line to the clip (1) and close the clip.
  5. Install the fuel feed line to the retaining feature (2) in the fuel tank.
  6. Install the fuel tank. Refer to «Fuel Tank Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) .

Fuel System Cleaning

IMPORTANTOnly use oil free compressed air to blow out the fuel pipes.
  1. Disconnect the negative battery cable. Refer to «Battery Negative Cable Disconnection and Connection»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#battery-charging-system-and-starting-system) .
  2. Remove the fuel tank module. Refer to «Fuel Tank Fuel Pump Module Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) .
  3. Inspect the fuel tank module strainer, if equipped. If the strainer is contaminated replace the fuel tank module.
  4. Inspect the fuel tank module inlet for dirt and debris. Replace the fuel tank module 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 module opening. Rock the tank to be sure that removal of the water from the tank is complete.
  7. Remove the fuel rail. Refer to «Fuel Injection Fuel Rail Assembly Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) .
  8. Drain the fuel from the fuel rail. It will be necessary to remove the fuel injectors from the fuel rail to properly clear all debris from the fuel rail and fuel injectors. Refer to «Fuel Injector Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) .
  9. Use light shop air to remove any debris from the fuel rail and injectors.
  10. Use light shop air in the opposite direction of the fuel flow in order to remove any debris from the fuel lines. Catch any fuel from the fuel lines with an approved gasoline container.
  11. Install the fuel injectors to the fuel rail. Refer to «Fuel Injector Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) .
  12. Install the fuel rail. Refer to «Fuel Injection Fuel Rail Assembly Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) .
  13. Install the fuel tank module. Refer to «Fuel Tank Fuel Pump Module Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) .
  14. Refill the fuel tank.
  15. Install the fuel fill cap.
  16. Connect the negative battery cable. Refer to «Battery Negative Cable Disconnection and Connection»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#battery-charging-system-and-starting-system) .
  17. Purge the fuel tank module. Disconnect the fuel feed line quick connect fitting from the fuel tank to the chassis line. Refer to «Plastic Collar Quick Connect Fitting Service»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-53l-60l-62l-repair-instructions) . Connect a length of hose to the fuel feed pipe. Insert the other end of the hose into an empty 3.8 liter (1 gallon) approved gasoline container. Add 23 liters (6 gallons) of clean fuel into the fuel tank. Turn on the fuel pump using the scan tool until 2 liters (1/2 gallon) of fuel flows into the fuel container.
  18. Inspect for leaks. Turn the ignition switch ON for 2 seconds. Turn the ignition switch OFF for 10 seconds. Turn the ignition switch ON. Inspect for fuel leaks.

Note. An 8-digit identification number is located on the fuel rail. Refer to this identification number when servicing or when part replacement is required.

  1. Remove the air cleaner outlet duct. Refer to «Air Cleaner Resonator Outlet Duct Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) .
  2. Relieve the fuel system pressure. Refer to «Fuel Pressure Relief (Without CH 48027)»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions__fuel-pressure-relief-without-ch-48027) .
  3. Remove the engine wiring harness bracket nut (1).
  4. Disconnect the engine wiring harness electrical connector (2) from the evaporative emission (EVAP) purge solenoid (3).
  5. Disconnect the engine wiring harness electrical connector (1) from the manifold absolute pressure (MAP) sensor (4).
  6. Remove the connector position assurance (CPA) retainer (2).
  7. Disconnect the engine wiring harness electrical connector (1) from the ignition coil main electrical connector.
  8. Disconnect the engine wiring harness electrical connectors (3) from the fuel injectors, perform the following: Mark the connectors to their corresponding injectors to ensure correct reassembly. Pull the CPA retainer on the connector up 1 click. Push the tab on the connector in. Disconnect the fuel injector electrical connector.
  9. Remove the engine wiring harness clip (4) from the ignition coil bracket stud.
  10. Remove the CPA retainer.
  11. Disconnect the engine wiring harness electrical connector (1) from the ignition coil main electrical connector.
  12. Disconnect the engine wiring harness electrical connector (2) from the electronic throttle control.
  13. Disconnect the engine wiring harness electrical connectors (5) from the fuel injectors, perform the following: Mark the connectors to their corresponding injectors to ensure correct reassembly. Pull the CPA retainer on the connector up 1 click. Push the tab on the connector in. Disconnect the fuel injector electrical connector.
  14. Remove the engine wiring harness clip (4) from the ignition coil bracket stud.
  15. Remove the heater hose bracket nut (2) and bracket (1). Reposition the bracket out of the way. Hoses shown removed for clarity.
  16. Remove the engine wiring harness clip bolt (4).
  17. Gather the branches of the engine wiring harness and reposition the aside.
  18. Remove the positive crankcase ventilation (PCV) hose.
  19. Disconnect the chassis fuel feed pipe (2) quick connect fitting from the fuel rail. Refer to «Metal Collar Quick Connect Fitting Service»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) .
  20. Disconnect the EVAP tube quick connect fitting at the intake manifold. Refer to «Plastic Collar Quick Connect Fitting Service»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) .
  21. Disconnect the chassis EVAP tube quick connect fitting at the EVAP canister purge solenoid. Refer to «Plastic Collar Quick Connect Fitting Service»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) .
  22. Disengage the retainer securing the EVAP canister purge solenoid to the fuel rail.
  23. Remove the EVAP tube and purge solenoid.
  24. Remove the fuel rail bolts.
  25. Remove the fuel rail assembly.
  26. Remove the fuel injector retainers (1).
  27. Remove the fuel injectors (3) from the fuel rail.
  28. Remove and discard the fuel injector upper and lower O-ring seals (2 and 4).
  1. Lubricate the NEW fuel injector O-ring seals with clean engine oil.
  2. Install the NEW fuel injector upper and lower O-ring seals (2 and 4) onto the injectors.
  3. Install the fuel injectors (3) into the fuel rails.
  4. Install the fuel injector retainers (1).
  5. Ensure the fuel injector lower O-ring seals are adequately lubricated, if not lubricate the fuel injector lower O-ring seals with clean engine oil.
  6. Position the fuel rail onto the intake manifold.
  7. Firmly push down on both the centers of the left and right fuel rails, until the rails are fully seated against the intake manifold.
  8. Install the fuel rail bolts. Tighten: Tighten the bolts to 10 N.m (89 lb in).
  9. Install the EVAP tube and purge solenoid.
  10. Install the EVAP canister purge solenoid to the fuel rail bracket and engage the retainer.
  11. Connect the chassis EVAP tube quick connect fitting at the EVAP canister purge solenoid. Refer to «Plastic Collar Quick Connect Fitting Service»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) .
  12. Connect the EVAP tube quick connect fitting at the intake manifold. Refer to «Plastic Collar Quick Connect Fitting Service»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) .
  13. Connect the chassis fuel feed pipe (2) quick connect fitting to the fuel rail. Refer to «Metal Collar Quick Connect Fitting Service»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) .
  14. Install the PCV hose.
  15. Gather the branches of the engine wiring harness and position over the top of the engine.
  16. Position the engine wiring harness clip and install the clip bolt (4). Tighten: Tighten the bolt to 9 N.m (80 lb in).
  17. Position and install the heater hose bracket (1) to the ignition coil bracket stud. Hoses shown removed for clarity.
  18. Install the heater hose bracket nut (2). Tighten: Tighten the nut to 9 N.m (80 lb in).
  19. Connect the engine wiring harness electrical connector (1) to the ignition coil main electrical connector.
  20. Install the CPA retainer.
  21. Connect the engine wiring harness electrical connector (2) to the electronic throttle control.
  22. Connect the engine wiring harness electrical connectors (5) to the fuel injectors, perform the following: Ensure that the CPA retainer is pulled out 1 click. Connect the electrical connectors to their corresponding injectors. Push the CPA retainer in 1 click. Ensure that the connector is secured.
  23. Install the engine wiring harness clip (4) to the ignition coil bracket stud.
  24. Connect the engine wiring harness electrical connector (1) to the ignition coil main electrical connector.
  25. Install the CPA retainer (2).
  26. Connect the engine wiring harness electrical connectors (3) to the fuel injectors, perform the following: Ensure that the CPA retainer is pulled out 1 click. Connect the electrical connectors to their corresponding injectors. Push the CPA retainer in 1 click. Ensure that the connector is secured.
  27. Install the engine wiring harness clip (4) to the ignition coil bracket stud.
  28. Connect the engine wiring harness electrical connector (1) to the MAP sensor (4).
  29. Connect the engine wiring harness electrical connector (2) to the EVAP purge solenoid (3).
  30. Install the engine wiring harness bracket nut (1). Tighten: Tighten the nut to 5 N.m (44 lb in).
  31. Connect the negative battery cable. Refer to «Battery Negative Cable Disconnection and Connection»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#battery-charging-system-and-starting-system) .
  32. Use the following procedure in order to inspect for leaks: Turn the ignition ON, with the engine OFF for 2 seconds. Turn the ignition OFF for 10 seconds. Turn the ignition ON, with the engine OFF. Inspect for leaks.
  33. Install the air cleaner outlet duct. Refer to «Air Cleaner Resonator Outlet Duct Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-53l-60l-62l-repair-instructions) .

Fuel Injector Cleaning

Special Tools

  1. J 37287 Fuel Line Shut-Off Adapters
  2. J 35800-A Fuel Injector Cleaner
  3. J 42873-1 3/8 Fuel Line Shut-Off Valve. See «Special Tools»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-special-tools-equipment) .
  4. J 42873-2 5/16 Return Pipe Shut-Off Valve. See «Special Tools»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-special-tools-equipment) .
  5. J 42964-1 3/8 Fuel Pipe Shut-Off Valve. See «Special Tools»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-special-tools-equipment) .
  6. J 42964-2 5/16 Fuel Pipe Shut-Off Valve. See «Special Tools»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-special-tools-equipment) .
CAUTIONGM Upper Engine and Fuel Injector 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 GM Upper Engine and Fuel Injector Cleaner be added to the vehicle fuel tank, as it may damage the fuel pump and other system components. Do not exceed the recommended cleaning solution concentration. Higher concentrations may damage fuel system components. Testing has demonstrated that exceeding the recommended cleaning solution concentration does not improve the effectiveness of this procedure.

Note. Vehicles with less than 160 km (100 mi) on the odometer should not have the injectors cleaned. These vehicles should have the injectors replaced.

  1. Obtain J 35800-A (2).
  2. For 4, 5, and 6 cylinder engines, empty two of the 30 ml (1 oz) reservoirs of the GM Upper Engine and Fuel Injector Cleaner twin reservoir container into the J 35800-A , injector cleaning tank, then add 420 ml (14 oz) of regular unleaded gasoline. If you are using any other brand of cleaning tank, you will need a total of 60 ml (2 oz) of GM Upper Engine and Fuel Injector Cleaner mixed with 420 ml (14 oz) of regular unleaded gasoline.
  3. For 8 cylinder engines, empty two of the 30 ml (1 oz) reservoirs of the GM Upper Engine and Fuel Injector Cleaner twin reservoir container into the J 35800-A , injector cleaning tank, then add 420 ml (14 oz) of regular unleaded gasoline. If you are using any other brand of cleaning tank, you will need a total of 60 ml (2 oz) of GM Upper Engine and Fuel Injector Cleaner mixed with 420 ml (14 oz) of regular unleaded gasoline. This procedure will need to be repeated for an 8 cylinder engine. The 8 cylinder engines receive 960 ml total fluid-120 ml (4 oz) of GM Upper Engine and Fuel Injector Cleaner and 840 ml (28 oz) of gasoline.
  4. Fill the injector cleaning tank with regular unleaded gasoline. Be sure to follow all additional instructions provided with the tool.
  5. Electrically disable the vehicle fuel pump by removing the fuel pump relay and disconnecting the oil pressure switch connector, if equipped.
  6. 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. See «Special Tools»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-special-tools-equipment) .
  7. Connect the J 35800-A to the vehicle fuel rail.
  8. Pressurize the J 35800-A to 510 kPa (75 psi).
  9. Start and idle the engine until it stalls due to lack of fuel. This should take approximately 15-20 minutes.
  10. Turn the ignition to the OFF position.
  11. Injectors should be flow-tested at this point. If further cleaning is needed, a repeat of the above procedure should be done. When the injector restriction returns to zero, proceed to step 12.
  12. Disconnect the J 35800-A from the fuel rail.
  13. Reconnect the vehicle fuel pump relay and oil pressure switch connector, if equipped.
  14. Remove the 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. See «Special Tools»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-special-tools-equipment) .
  15. Start and idle the vehicle for an additional two minutes to ensure residual injector cleaner is flushed from the fuel rail and fuel lines.
  16. Pour the entire contents of GM Fuel System Treatment Plus, GM P/N 88861011 (Canadian P/N 88861012) into a nearly empty tank and advise the customer to refuel with up to 76 L (20 gal) of fuel.
  17. Advise the customer to use only a Top Tier Detergent gasoline and to add a bottle of GM Fuel System Treatment Plus to the fuel tank at every oil change. Regular use of GM Fuel System Treatment Plus should keep the customer from having to repeat the injector cleaning procedure.
  18. Road test the vehicle to verify that the customer concern has been corrected.
CAUTIONUse 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.

Note. An 8-digit identification number is located on the fuel rail. Refer to this identification number when servicing or when part replacement is required. The engine oil may be contaminated with fuel if the fuel injectors are leaking.

  1. Remove the air cleaner outlet duct. Refer to «Air Cleaner Resonator Outlet Duct Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) .
  2. Relieve the fuel system pressure. Refer to «Fuel Pressure Relief (Without CH 48027)»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions__fuel-pressure-relief-without-ch-48027) .
  3. Remove the engine wiring harness bracket nut (1).
  4. Disconnect the engine wiring harness electrical connector (2) from the evaporative emission (EVAP) purge solenoid (3).
  5. Disconnect the engine wiring harness electrical connector (1) from the manifold absolute pressure (MAP) sensor (4).
  6. Remove the connector position assurance (CPA) retainer (2).
  7. Disconnect the engine wiring harness electrical connector (1) from the ignition coil main electrical connector.
  8. Disconnect the engine wiring harness electrical connectors (3) from the fuel injectors, perform the following: Mark the connectors to their corresponding injectors to ensure correct reassembly. Pull the CPA retainer on the connector up 1 click. Push the tab on the connector in. Disconnect the fuel injector electrical connector.
  9. Remove the engine wiring harness clip (4) from the ignition coil bracket stud.
  10. Remove the CPA retainer.
  11. Disconnect the engine wiring harness electrical connector (1) from the ignition coil main electrical connector.
  12. Disconnect the engine wiring harness electrical connector (2) from the electronic throttle control.
  13. Disconnect the engine wiring harness electrical connectors (5) from the fuel injectors, perform the following: Mark the connectors to their corresponding injectors to ensure correct reassembly. Pull the CPA retainer on the connector up 1 click. Push the tab on the connector in. Disconnect the fuel injector electrical connector.
  14. Remove the engine wiring harness clip (4) from the ignition coil bracket stud.
  15. Remove the heater hose bracket nut (2) and bracket (1). Reposition the bracket out of the way. Hoses shown removed for clarity.
  16. Remove the engine wiring harness clip bolt (4) from the generator bracket.
  17. Gather the branches of the engine wiring harness and reposition the aside.
  18. Remove the positive crankcase ventilation (PCV) hose.
  19. Disconnect the chassis fuel feed pipe (2) quick connect fitting from the fuel rail. Refer to «Metal Collar Quick Connect Fitting Service»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) .
  20. Disconnect the EVAP tube quick connect fitting at the intake manifold. Refer to «Plastic Collar Quick Connect Fitting Service»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) .
  21. Disconnect the chassis EVAP tube quick connect fitting at the EVAP canister purge solenoid. Refer to «Plastic Collar Quick Connect Fitting Service»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) .
  22. Disengage the retainer securing the EVAP canister purge solenoid to the fuel rail.
  23. Remove the EVAP tube and purge solenoid.
  24. Remove the fuel rail bolts.
  25. Remove the fuel rail assembly.
  26. Remove the fuel injector retainers (1).
  27. Remove the fuel injectors (3) from the fuel rail.
  28. Remove and discard the fuel injector upper and lower O-ring seals (2 and 4).
  1. Lubricate the NEW fuel injector O-ring seals with clean engine oil.
  2. Install the NEW fuel injector upper and lower O-ring seals (2 and 4) onto the injectors.
  3. Install the fuel injectors (3) into the fuel rails.
  4. Install the fuel injector retainers (1).
  5. Ensure the fuel injector lower O-ring seals are adequately lubricated, if not lubricate the fuel injector lower O-ring seals with clean engine oil.
  6. Position the fuel rail onto the intake manifold.
  7. Firmly push down on both the centers of the left and right fuel rails, until the rails are fully seated against the intake manifold.
  8. Install the fuel rail bolts. Tighten: Tighten the bolts to 10 N.m (89 lb in).
  9. Install the EVAP tube and purge solenoid.
  10. Install the EVAP canister purge solenoid to the fuel rail bracket and engage the retainer.
  11. Connect the chassis EVAP tube quick connect fitting at the EVAP canister purge solenoid. Refer to «Plastic Collar Quick Connect Fitting Service»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) .
  12. Connect the EVAP tube quick connect fitting at the intake manifold. Refer to «Plastic Collar Quick Connect Fitting Service»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) .
  13. Connect the chassis fuel feed pipe (2) quick connect fitting to the fuel rail. Refer to «Metal Collar Quick Connect Fitting Service»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) .
  14. Install the PCV hose.
  15. Gather the branches of the engine wiring harness and position over the top of the engine.
  16. Position the engine wiring harness clip to the generator bracket and install the clip bolt (4). Tighten: Tighten the bolt to 9 N.m (80 lb in).
  17. Position and install the heater hose bracket (1) to the ignition coil bracket stud. Hoses shown removed for clarity.
  18. Install the heater hose bracket nut (2). Tighten: Tighten the nut to 9 N.m (80 lb in).
  19. Connect the engine wiring harness electrical connector (1) to the ignition coil main electrical connector.
  20. Install the CPA retainer.
  21. Connect the engine wiring harness electrical connector (2) to the electronic throttle control.
  22. Connect the engine wiring harness electrical connectors (5) to the fuel injectors, perform the following: Ensure that the CPA retainer is pulled out 1 click. Connect the electrical connectors to their corresponding injectors. Push the CPA retainer in 1 click. Ensure that the connector is secured.
  23. Install the engine wiring harness clip (4) to the ignition coil bracket stud.
  24. Connect the engine wiring harness electrical connector (1) to the ignition coil main electrical connector.
  25. Install the CPA retainer (2).
  26. Connect the engine wiring harness electrical connectors (3) to the fuel injectors, perform the following: Ensure that the CPA retainer is pulled out 1 click. Connect the electrical connectors to their corresponding injectors. Push the CPA retainer in 1 click. Ensure that the connector is secured.
  27. Install the engine wiring harness clip (4) to the ignition coil bracket stud.
  28. Connect the engine wiring harness electrical connector (1) to the MAP sensor (4).
  29. Connect the engine wiring harness electrical connector (2) to the EVAP purge solenoid (3).
  30. Install the engine wiring harness bracket nut (1). Tighten: Tighten the nut to 5 N.m (44 lb in).
  31. Connect the negative battery cable. Refer to «Battery Negative Cable Disconnection and Connection»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#battery-charging-system-and-starting-system) .
  32. Use the following procedure in order to inspect for leaks: Turn the ignition ON, with the engine OFF for 2 seconds. Turn the ignition OFF for 10 seconds. Turn the ignition ON, with the engine OFF. Inspect for leaks.
  33. Install the air cleaner outlet duct. Refer to «Air Cleaner Resonator Outlet Duct Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-53l-60l-62l-repair-instructions) .
IMPORTANTClean all evaporative emission (EVAP) line connections and surrounding areas prior to disconnecting, in order to avoid possible EVAP system contamination.
  1. Remove the intake manifold sight shield. Refer to «Upper Intake Manifold Sight Shield Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/mechanical/#engine-mechanical-53l-60l-62l-repair-instructions-on-vehicle) .
  2. Disconnect the EVAP line quick connect fitting from the EVAP canister purge solenoid. Refer to «Plastic Collar Quick Connect Fitting Service»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) .
  3. Disconnect the engine wiring harness electrical connector (2) from the EVAP canister purge solenoid (3).
  4. Disconnect the chassis EVAP line quick connect fitting from the EVAP canister purge solenoid. Refer to «Plastic Collar Quick Connect Fitting Service»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) .
  5. Disengage the retainer securing the EVAP canister purge solenoid to the fuel rail.
  6. Remove the EVAP canister purge solenoid.
  1. Install the EVAP canister purge solenoid.
  2. Install the EVAP canister purge solenoid to the fuel rail and engage the retainer.
  3. Connect the engine wiring harness electrical connector (2) to the EVAP canister purge solenoid (3).
  4. Connect the chassis EVAP line quick connect fitting to the EVAP canister purge solenoid. Refer to «Plastic Collar Quick Connect Fitting Service»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) .
  5. Connect the EVAP line quick connect fitting to the EVAP canister purge solenoid. Refer to «Plastic Collar Quick Connect Fitting Service»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) .
  6. Install the intake manifold sight shield. Refer to «Upper Intake Manifold Sight Shield Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/mechanical/#engine-mechanical-53l-60l-62l-repair-instructions-on-vehicle) .
IMPORTANTClean all evaporative emission (EVAP) line connections and surrounding areas prior to disconnecting, in order to avoid possible EVAP system contamination.
  1. Raise and suitably support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#general-information__lifting-and-jacking-the-vehicle) .
  2. Disconnect the chassis wiring harness electrical connector (1) from the EVAP canister vent solenoid.
  3. Disconnect the fuel fill pipe vent pipe quick connect fitting (2) from the EVAP canister vent solenoid. Refer to «Plastic Collar Quick Connect Fitting Service»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) .
  4. Disconnect the EVAP canister vent solenoid line quick connect fitting (1) from the auxiliary EVAP canister. Refer to «Plastic Collar Quick Connect Fitting Service»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) .
  5. Disengage the retainer (1) securing the EVAP canister vent solenoid to the bracket.
  6. Remove the EVAP canister vent solenoid (2).
  1. Install the EVAP canister vent solenoid (2).
  2. Slide the EVAP canister vent solenoid onto the bracket until the retainer (1) engages the clip.
  3. Connect the EVAP canister vent solenoid line quick connect fitting (1) to the auxiliary EVAP canister. Refer to «Plastic Collar Quick Connect Fitting Service»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) .
  4. Connect the fuel fill pipe vent pipe quick connect fitting (2) to the EVAP canister vent solenoid. Refer to «Plastic Collar Quick Connect Fitting Service»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) .
  5. Connect the chassis wiring harness electrical connector (1) to the EVAP canister vent solenoid.
  6. Lower the vehicle.
IMPORTANTClean the evaporative emission (EVAP) line connections and surrounding areas prior to disconnecting the fittings in order to avoid possible EVAP system contamination.
  1. Raise and suitably support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#general-information__lifting-and-jacking-the-vehicle) .
  2. Disconnect the EVAP pipe quick connect fitting from the auxiliary EVAP canister. (Body shown removed for clarity). Refer to «Plastic Collar Quick Connect Fitting Service»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) .
  3. Disconnect the EVAP pipe quick connect fitting from the EVAP canister. Refer to «Plastic Collar Quick Connect Fitting Service»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) .
  4. Remove the EVAP pipe clip (2) from the frame crossmember.
  5. Remove the EVAP pipe clip (1) from the rear brake front pipes.
  6. Remove the EVAP pipe (3) from the vehicle.
  1. Install the EVAP pipe (3) to the vehicle.
  2. Connect the EVAP pipe quick connect fitting to the EVAP canister. Refer to «Plastic Collar Quick Connect Fitting Service»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) .
  3. Connect the EVAP pipe quick connect fitting to the auxiliary EVAP canister. Refer to «Plastic Collar Quick Connect Fitting Service»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) .
  4. Install the EVAP pipe clip (1) to the rear brake front pipes.
  5. Install the EVAP pipe clip (2) to the frame crossmember.
  6. Lower the vehicle.
IMPORTANTClean all evaporative emission (EVAP) line connections and surrounding areas prior to disconnecting the fittings in order to avoid possible system contamination.
  1. Remove the air cleaner outlet duct. Refer to «Air Cleaner Resonator Outlet Duct Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) .
  2. Disconnect the EVAP line quick connect fitting at the intake manifold. Refer to «Plastic Collar Quick Connect Fitting Service»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) .
  3. Disconnect the EVAP line quick connect fitting at the EVAP canister purge solenoid. Refer to «Plastic Collar Quick Connect Fitting Service»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) .
  1. Connect the EVAP line quick connect fitting at the EVAP canister purge solenoid. Refer to «Plastic Collar Quick Connect Fitting Service»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) .
  2. Connect the EVAP line quick connect fitting at the intake manifold. Refer to «Plastic Collar Quick Connect Fitting Service»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) .
  3. Install the air cleaner outlet duct. Refer to «Air Cleaner Resonator Outlet Duct Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) .

Note. Clean all fuel and evaporative emission (EVAP) lines connections and surrounding areas prior to disconnecting the lines in order to avoid possible fuel and/or EVAP system contamination.

  1. Remove the intake manifold sight shield. Refer to «Upper Intake Manifold Sight Shield Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/mechanical/#engine-mechanical-53l-60l-62l-repair-instructions-on-vehicle) .
  2. Relieve the fuel system pressure. Refer to the «Fuel Pressure Relief (Without CH 48027)»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions__fuel-pressure-relief-without-ch-48027) .
  3. Disconnect the EVAP line (1) quick connect fitting from the chassis EVAP line. Refer to «Plastic Collar Quick Connect Fitting Service»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) .
  4. Disconnect the fuel feed line quick connect fitting (2) from the fuel rail. Refer to «Metal Collar Quick Connect Fitting Service»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) .
  5. Cap the fuel rail and EVAP pipes.
  6. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#general-information__lifting-and-jacking-the-vehicle) .
  7. Remove the transfer case. Refer to «Transfer Case Assembly Replacement»(ref-364539-S24625579642010063000000) .
  8. Disconnect the chassis wiring harness electrical connector (1) from the fuel pressure sensor (2).
  9. Disconnect the engine wiring harness clip (4) from the fuel pipe bracket (3).
  10. Lower the transmission and remove the fuel pipe bracket nut from the bellhousing stud.
  11. Remove the fuel line clip from the bracket on the automatic transmission.
  12. If equipped with 4-wheel drive (4WD), remove the fuel hose/pipe clip from the bracket on the transfer case.
  13. Disconnect the range selector cable from the transmission range selector. Refer to «Range Selector Lever Cable Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/automatic-trans/#automatic-transmission-6l456l506l806l90-repair-instructions-on-vehicle) .
  14. Remove the hybrid brake pressure modulator valve. Refer to «Brake Pressure Modulator Valve Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/anti-locktraction-control/#antilock-brake-system-hybrid-hp2-with-electronic-brake-distribution-vehicle-stability-system) .
  15. Remove the fuel line bracket bolt (3).
  16. Disconnect the chassis EVAP line quick connect fitting (4) from the fuel tank line. Refer to «Plastic Collar Quick Connect Fitting Service»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) .
  17. Disconnect the fuel tank fuel feed line quick connect fitting (5) from the chassis line. Refer to «Plastic Collar Quick Connect Fitting Service»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) .
  18. Cap the fuel and EVAP lines in order to prevent possible fuel and/or EVAP system contamination.
  19. Remove the fuel/EVAP line clips from the frame and crossmember.
  20. Remove the fuel line bracket locator tab from the frame.
  21. Remove the fuel/EVAP lines from the vehicle.
  1. Install the fuel/EVAP lines to the vehicle.
  2. Install the fuel line bracket locator tab to the frame.
  3. Install the fuel/EVAP line clips to the frame and crossmember.
  4. Install the fuel line bracket bolt (3). Tighten: Tighten the bolt to 12 N.m (106 lb in).
  5. Remove the caps from the fuel and EVAP lines.
  6. Connect the chassis EVAP line quick connect fitting (4) to the fuel tank line. Refer to «Plastic Collar Quick Connect Fitting Service»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) .
  7. Connect the fuel tank fuel feed line quick connect fitting (5) to the chassis line. Refer to «Plastic Collar Quick Connect Fitting Service»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) .
  8. If equipped with 4WD, install the fuel hose/pipe clip to the bracket on the transfer case.
  9. Install the fuel line clip to the bracket on the automatic transmission.
  10. Install the fuel pipe bracket nut to the bellhousing stud. Tighten: Tighten the nut to 20 N.m (15 lb ft).
  11. Install the hybrid brake pressure modulator valve. Refer to «Brake Pressure Modulator Valve Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/anti-locktraction-control/#antilock-brake-system-hybrid-hp2-with-electronic-brake-distribution-vehicle-stability-system) .
  12. Install the transfer case. Refer to «Transfer Case Assembly Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/transfer-case/#transfer-case-bw-4485-nr3) for the BW 4485-NP3 transfer case or «Transfer Case Assembly Replacement»(ref-364539-S24625579642010063000000) for the MP 3023/3024-NQH transfer case.
  13. Connect the chassis wiring harness electrical connector (1) to the fuel pressure sensor (2).
  14. Connect the engine wiring harness clip (4) to the fuel pipe bracket (3).
  15. Lower the vehicle.
  16. Remove the caps from the fuel rail and EVAP line.
  17. Disconnect the EVAP line (1) quick connect fitting from the chassis EVAP line. Refer to «Plastic Collar Quick Connect Fitting Service»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) .
  18. Disconnect the fuel feed line quick connect fitting (2) from the fuel rail. Refer to «Metal Collar Quick Connect Fitting Service»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) .
  19. Install the fuel fill cap.
  20. Connect the negative battery cable. Refer to «Battery Negative Cable Disconnection and Connection»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#battery-charging-system-and-starting-system) .
  21. Use the following procedure in order to inspect for leaks: Turn the ignition ON, with the engine OFF, for 2 seconds. Turn the ignition OFF for 10 seconds. Turn the ignition ON, with the engine OFF. Inspect for fuel leaks.
  22. Install the intake manifold sight shield. Refer to «Upper Intake Manifold Sight Shield Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/mechanical/#engine-mechanical-53l-60l-62l-repair-instructions-on-vehicle) .
IMPORTANTClean the evaporative emission (EVAP) line connections and surrounding areas prior to disconnecting the fittings in order to avoid possible EVAP system contamination.
  1. Remove the fuel tank. Refer to «Fuel Tank Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) .
  2. Remove the fuel tank shield retainers (2, and 3) and shields (1, and 4).
  3. Remove the EVAP lines from the fuel tank clips (2, and 6).
  4. Open the fuel tank clips (1, 3, 4, and 5) and remove the EVAP lines from the clips.
  5. Disconnect the EVAP line quick connect fittings at the fuel tank module and vent valve. Refer to «Plastic Collar Quick Connect Fitting Service»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) .
  6. Remove the EVAP lines from the fuel tank.
  1. Install the EVAP lines to the fuel tank.
  2. Connect the EVAP line quick connect fittings at the fuel tank module and vent valve. Refer to «Plastic Collar Quick Connect Fitting Service»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) .
  3. Install the EVAP lines to the fuel tank clips (1, 3, 4, and 5) and close the clips.
  4. Install the EVAP lines to the fuel tank clips (2, and 6).
  5. Install the fuel tank shields (1, and 4) and retainers (2, and 3).
  6. Install the fuel tank. Refer to «Fuel Tank Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) .

Note. Clean all evaporative emission (EVAP) line connections and surrounding areas prior to disconnecting, in order to avoid possible EVAP system contamination.

  1. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#general-information__lifting-and-jacking-the-vehicle) .
  2. Disconnect the fuel tank EVAP line quick connect fitting (3) from the EVAP canister. Refer to «Plastic Collar Quick Connect Fitting Service»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) .
  3. Disconnect the fuel tank EVAP line quick connect fitting (2) from the EVAP canister. Refer to «Plastic Collar Quick Connect Fitting Service»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) .
  4. Disconnect the EVAP pipe quick connecting fitting (1) from the EVAP canister. Refer to «Plastic Collar Quick Connect Fitting Service»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) .
  5. Remove the EVAP canister bracket bolts (1).
  6. Remove the EVAP canister assembly (2) from the tab on the frame bracket.
  7. Remove the EVAP canister bolt (1).
  8. Remove the EVAP canister (2) from the bracket (3).
  1. Install the EVAP canister (2) to the bracket (3).
  2. Install the EVAP canister bolt (1). Tighten: Tighten the bolt to 25 N.m (18 lb ft).
  3. Position and install the EVAP canister assembly (2) to the fame bracket tab.
  4. Install the EVAP canister bolts (1). Tighten: Tighten the bolts to 25 N.m (18 lb ft).
  5. Connect the EVAP pipe quick connecting fitting (1) to the EVAP canister. Refer to «Plastic Collar Quick Connect Fitting Service»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) .
  6. Connect the fuel tank EVAP line quick connect fitting (2) to the EVAP canister. Refer to «Plastic Collar Quick Connect Fitting Service»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) .
  7. Connect the fuel tank EVAP line quick connect fitting (3) to the EVAP canister. Refer to «Plastic Collar Quick Connect Fitting Service»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) .
  8. Lower the vehicle.
IMPORTANTClean the evaporative emission (EVAP) line connections and surrounding areas prior to disconnecting the fittings in order to avoid possible EVAP system contamination.
  1. Remove the EVAP canister vent solenoid valve. Refer to «Evaporative Emission Canister Vent Solenoid Valve Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) .
  2. Disconnect the EVAP pipe quick connect fitting (3) from the auxiliary EVAP canister. Refer to «Plastic Collar Quick Connect Fitting Service»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) .
  3. Remove the auxiliary EVAP canister nuts (1).
  4. Remove the auxiliary EVAP canister (1) from the vehicle.
  1. Install the auxiliary EVAP canister (1) to the vehicle.
  2. Install the auxiliary EVAP canister nuts (1).
  3. Connect the EVAP pipe quick connect fitting (3) to the auxiliary EVAP canister. Refer to «Plastic Collar Quick Connect Fitting Service»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) .
  4. Install the EVAP canister vent solenoid valve. Refer to «Evaporative Emission Canister Vent Solenoid Valve Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) .

Tools Required

J 41413-200 Evaporative Emissions System Tester (EEST)

Inspection Procedure

IMPORTANTDo not perform this procedure unless instructed by an evaporative emission (EVAP) diagnostic.
  1. Turn OFF the ignition.
  2. Remove the EVAP canister purge solenoid valve. Refer to «Evaporative Emission Canister Purge Solenoid Valve Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) .
  3. Lightly tap the EVAP canister purge solenoid valve on a clean hard surface.
  4. Inspect for carbon particles exiting either of the vacuum ports. If no carbon particles are found reinstall the EVAP canister purge solenoid valve and continue with the EVAP cleaning procedure. Refer to «Evaporative Emission Canister Purge Solenoid Valve Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) . If carbon particles are found during the inspection procedure, replace the EVAP canister purge solenoid valve and continue with the EVAP cleaning procedure. Refer to «Evaporative Emission Canister Purge Solenoid Valve Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) . If you were instructed to replace the EVAP canister purge solenoid valve, and no carbon particles are found, return to the EVAP diagnostic procedure. Do not perform the EVAP cleaning procedure.

EVAP Cleaning Procedure

  1. Remove the EVAP canister. Refer to «Evaporative Emission Canister Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) .
  2. Turn OFF the main valve on the J 41413-200 .
  3. Disconnect the hose from the diagnostic station pressure regulator.
  4. Using a section of vacuum hose, connect one end to the diagnostic station pressure regulator.
  5. Connect the other end of the vacuum hose to the canister side of the purge pipe.
  6. Turn ON the main nitrogen cylinder valve and continue to discharge nitrogen for 15 seconds.
  7. If the nitrogen does not dislodge the carbon particles, replace the purge pipe.
  8. Return the EVAP pressure/purge diagnostic station to the stations original condition.
  9. Install a new EVAP canister. Refer to «Evaporative Emission Canister Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) .
  10. Connect all previously disconnected EVAP pipe connectors.
  11. Lower the vehicle.
  12. Continue with the published service manual diagnostic DTC procedure.
  1. Remove the intake manifold sight shield, as required. Refer to «Upper Intake Manifold Sight Shield Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/mechanical/#engine-mechanical-53l-60l-62l-repair-instructions-on-vehicle) .
  2. If replacing one of the rear 2 ignitions coils on the right side perform steps 3 through 13, otherwise proceed to step 14.
  3. Perform the service disconnect. Refer to «High Voltage Disabling»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-energy-storage-system__high-voltage-disabling) .
  4. Disconnect the engine wiring harness electrical connector (3) from the drive motor generator power inverter module cover.
  5. Loosen the drive motor generator power inverter module cover bolt (1).
  6. Remove the drive motor generator power inverter module cover (2).
  7. Remove the generator control module 3 phase cable clip nut (1).
  8. Remove the generator control module 3 phase cable clip from the engine bracket (2).
  9. Reposition the generator control module 3 phase cables out of the way.
  10. Remove the right wheelhouse liner. Refer to «Front Wheelhouse Liner Replacement - Right Side»(/cadillac/escalade/gmt900-2006-2014/remont/frames-subframes-crossmembers/#frame-and-underbody) .
  11. Working through the wheel opening, remove the engine bracket bolts (2).
  12. Lower the vehicle.
  13. Remove the engine bracket nut (1) from the ignition coil bracket stud and remove the bracket (3).
  14. Disconnect the ignition coil wiring harness electrical connector (1) from the ignition coil.
  15. Remove the spark plug wire from the ignition coil. Twist the spark plug wire boot a 1/2 turn. Pull only on the boot in order to remove the wire from the ignition coil.
  16. Remove the ignition coil bolts.
  17. Remove the ignition coil from the bracket.
  18. There are 2 different manufacturers for the ignition coils and coil brackets. They are as follows
  19. The Melco® (1) ignition coil is a square design.
  20. The Delphi® (2) ignition coil is a round design.
  21. The Melco® ignition coil bracket (1) is a square design.
  22. The Delphi® ignition coil bracket (2) is a round design.
  1. Position the ignition coil to the ignition coil bracket.
  2. Install the ignition coil bolts. Tighten: Tighten the bolts to 10 N.m (89 lb in).
  3. Install the spark plug wire to the ignition coil.
  4. Inspect the spark plug wire for proper installation: Push sideways on each boot in order the inspect the seating. Reinstall any loose boot.
  5. Connect the ignition coil wiring harness electrical connector (1) to the ignition coil.
  6. If replacing one of the rear 2 ignitions coils on the right side perform steps 7 through 16, otherwise proceed to step 17.
  7. Install the engine bracket (3) to the ignition coil bracket stud and install nut (1). Tighten: Tighten the nut to 9 N.m (80 lb in).
  8. Raise the vehicle half way.
  9. Working through the wheel opening, install the engine bracket bolts (2). Tighten: Tighten the bolts to 50 N.m (37 lb ft).
  10. Install the right wheelhouse liner. Refer to «Front Wheelhouse Liner Replacement - Right Side»(/cadillac/escalade/gmt900-2006-2014/remont/frames-subframes-crossmembers/#frame-and-underbody) .
  11. Position the generator control module 3 phase cables to the bracket channel.
  12. Install the generator control module 3 phase cable clip to the tab (3) on the engine bracket (2).
  13. Install the generator control module 3 phase cable clip nut (1). Tighten: Tighten the nut to 9 N.m (80 lb in).
  14. Install the drive motor generator power inverter module cover (2).
  15. Tighten the drive motor generator power inverter module cover bolt (1). Tighten: Tighten the bolt to 1.5 N.m (13 lb in).
  16. Connect the engine wiring harness electrical connector (3) to the drive motor generator power inverter module cover.
  17. Install the intake manifold sight shield, as required. Refer to «Upper Intake Manifold Sight Shield Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/mechanical/#engine-mechanical-53l-60l-62l-repair-instructions-on-vehicle) .
  18. Perform the service reconnect. Refer to «High Voltage Enabling»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-energy-storage-system__high-voltage-enabling) .

Spark Plug Wire Inspection

Spark plug wire integrity is vital for proper engine operation. A thorough inspection is necessary to accurately identify conditions that may affect engine operation. Inspect for the following conditions

  1. Correct routing of the spark plug wires, Incorrect routing may cause cross firing.
  2. Any signs of cracks or splits in the wires.
  3. Inspect each boot for any of 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, replace the wire and the component connected to the wire.

  1. If replacing the right side spark plug wire(s), remove the right front wheelhouse liner. Refer to «Front Wheelhouse Liner Replacement - Right Side»(/cadillac/escalade/gmt900-2006-2014/remont/frames-subframes-crossmembers/#frame-and-underbody) , and remove the right side plug wire(s) through the wheel opening.
  2. Remove the spark plug wire from the spark plug. Twist the spark plug wire boot a 1/2 turn. Pull only on the boot in order to remove the wire from the spark plug.
  3. Remove the spark plug wire from the ignition coil. Twist the spark plug wire boot a 1/2 turn. Pull only on the boot in order to remove the wire from the ignition coil.
  1. Install the spark plug wire to the ignition coil.
  2. Install the spark plug wire to the spark plug.
  3. Inspect the spark plug wire for proper installation: Push sideways on each boot in order to inspect the seating. Reinstall any loose boot.
  4. If the right side spark plug wire(s) was replaced, install the right front wheelhouse liner. Refer to «Front Wheelhouse Liner Replacement - Right Side»(/cadillac/escalade/gmt900-2006-2014/remont/frames-subframes-crossmembers/#frame-and-underbody) .

Spark Plug Inspection

  1. Verify that the correct spark plug is installed. An incorrect spark plug causes driveability conditions. Refer to «Ignition System Specifications»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-53l-60l-62l-specifications__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, replace with a colder plug Pre-ignition causing spark plug and/or engine damage , replace with a hotter plug
  3. 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.
  4. Inspect the insulator (2) for flashover or carbon tracking, or 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 will cause arcing to ground.
  5. Inspect the insulator (2) for cracks. All or part of the electrical charge may arc through the crack instead of the electrodes (3, 4).
  6. Inspect for evidence of improper arcing. Measure the gap between the center electrode (4) and the side electrode (3). Refer to «Ignition System Specifications»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-53l-60l-62l-specifications__ignition-system-specifications) . An excessively wide electrode gap can prevent correct spark plug operation. Inspect for the correct spark plug torque. Refer to «Ignition System Specifications»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-53l-60l-62l-specifications__ignition-system-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.
  7. 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.

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 ignition 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 plug intensity. Most powdery deposits will not affect spark plug intensity unless they form into a glazing over the electrode.
  1. If replacing the right side spark plug(s), remove the right front wheelhouse liner. Refer to «Front Wheelhouse Liner Replacement - Right Side»(/cadillac/escalade/gmt900-2006-2014/remont/frames-subframes-crossmembers/#frame-and-underbody) , and remove the right side plug(s) through the wheel opening.
  2. If replacing the right side spark plug(s), perform the service disconnect. Refer to «High Voltage Disabling»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-energy-storage-system__high-voltage-disabling) .
  3. Remove the spark plug wire from the spark plug. Twist the spark plug wire boot a 1/2 turn. Pull only on the boot in order to remove the wire from the spark plug.
  4. Brush or using compressed air, blow away any dirt from around the spark plug.
  5. Remove the spark plug. If removing more than one plug, place each plug in a tray marked with the corresponding cylinder number.
  1. Correctly position the spark plug washer.
  2. Inspect the spark plug gap. Adjust the gap as needed. Refer to «Ignition System Specifications»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-53l-60l-62l-specifications__ignition-system-specifications)
  3. Hand start the spark plug in the corresponding cylinder.
  4. Tighten the spark plug. Tighten: Tighten the plug to 15 N.m (11 lb ft).
  5. Install the spark plug wire to the spark plug.
  6. Inspect the spark plug wire for proper installation: Push sideways on each boot in order to inspect the seating. Reinstall any loose boot.
  7. If a right side spark plug(s) was replaced, install the right front wheelhouse liner. Refer to «Front Wheelhouse Liner Replacement - Right Side»(/cadillac/escalade/gmt900-2006-2014/remont/frames-subframes-crossmembers/#frame-and-underbody) .
  8. If a right side spark plug(s) was replaced, perform the service reconnect. Refer to «High Voltage Enabling»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-energy-storage-system__high-voltage-enabling) .

Note. Perform the Crankshaft Position System Variation Learn whenever the crankshaft position sensor is removed or replaced.

  1. Raise and suitably support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#general-information__lifting-and-jacking-the-vehicle) .
  2. Reposition the engine wiring harness sleeve (2).
  3. Disconnect the engine wiring harness electrical connector (1) from the crankshaft position (CKP) sensor.
  4. Clean the area around the CKP sensor before removal in order to avoid debris from entering the engine.
  5. Remove the CKP sensor bolt.
  6. Remove the CKP sensor.
  1. Install the CKP sensor.
  2. Install the CKP sensor bolt. Tighten: Tighten the bolt to 25 N.m (18 lb ft).
  3. Connect the engine wiring harness electrical connector (1) to the CKP sensor.
  4. Position the engine wiring harness sleeve (2) over the CKP sensor electrical connection.
  5. Lower the vehicle.
  6. Perform the CKP system variation learn procedure. Refer to «Crankshaft Position System Variation Learn»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-53l-60l-62l-repair-instructions__crankshaft-position-system-variation-learn) .

Note. Clean the area around the camshaft position (CMP) sensor before removal in order to prevent debris from entering the engine.

  1. Raise and suitably support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#general-information__lifting-and-jacking-the-vehicle) .
  2. Remove the engine shield. Refer to «Engine Shield Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/frames-subframes-crossmembers/#frame-and-underbody) .
  3. Disconnect the engine wiring harness electrical connector (3) from the CMP sensor wire harness.
  4. Disconnect the CMP sensor wire harness electrical connector (1) from the CMP actuator magnet.
  5. Working through the crankshaft balancer opening, loosen the CMP sensor wire harness bolt (1) 2 turns using a box wrench.
  6. Remove the 2 remaining CMP sensor wire harness bolts (1).
  7. Lower the vehicle.
  8. Using a small flat bladed tool, disengage the CMP sensor wire harness electrical connector retainer (1) from the CMP sensor.
  9. Remove the CMP sensor wire harness (1).
  10. Remove the CMP sensor (1) and O-ring seal (2).
  1. Inspect the CMP O-ring seal (2) for cuts or damage. If the seal is not damaged, it may be reused.
  2. Lubricate the O-ring seal with clean engine oil.
  3. Install the O-ring seal onto the sensor.
  4. Instal the CMP sensor (1) to the front cover.
  5. Install the CMP sensor wire harness (1).
  6. Connect the CMP sensor wire harness electrical connector, ensure that the retainer (1) fully engages the CMP sensor.
  7. Raise and suitably support the vehicle.
  8. Install the 2 rear CMP sensor wire harness bolts (1). Tighten: Tighten the bolt to 12 N.m (106 lb in).
  9. Working through the crankshaft balancer opening, tighten the CMP sensor wire harness bolt (1) using a box wrench.
  10. Connect the CMP sensor wire harness electrical connector (1) to the CMP actuator magnet.
  11. Connect the engine wiring harness electrical connector (3) to the CMP sensor wire harness.
  12. Install the engine shield. Refer to «Engine Shield Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/frames-subframes-crossmembers/#frame-and-underbody) .
  1. If equipped with 4WD, remove the left front wheelhouse liner. Refer to «Front Wheelhouse Liner Replacement - Left Side»(/cadillac/escalade/gmt900-2006-2014/remont/frames-subframes-crossmembers/#frame-and-underbody__front-wheelhouse-liner-replacement-left) .
  2. Remove the left front wheel and tire. Refer to «Tire and Wheel Removal and Installation»(/cadillac/escalade/gmt900-2006-2014/remont/wheel-tire-system/#tires-wheels__tire-and-wheel-removal-and-installation) .
  3. Working through the wheel well opening, reposition the engine wiring harness sleeve (3).
  4. Disconnect the engine wiring harness electrical connector (4) from knock sensor.
  5. Remove the knock sensor bolt (739) and knock sensor (718).
  1. Position the knock sensor (718) to the engine block and install the knock sensor bolt (739). Tighten the bolt to 25 N.m (18 lb ft).
  2. Connect the engine wiring harness electrical connector (4) to knock sensor.
  3. Position the engine wiring harness sleeve (3) over the knock sensor electrical connection.
  4. Install the left front wheel and tire. Refer to «Tire and Wheel Removal and Installation»(/cadillac/escalade/gmt900-2006-2014/remont/wheel-tire-system/#tires-wheels__tire-and-wheel-removal-and-installation) .
  5. If removed, install the left front wheelhouse liner. Refer to «Front Wheelhouse Liner Replacement - Left Side»(/cadillac/escalade/gmt900-2006-2014/remont/frames-subframes-crossmembers/#frame-and-underbody__front-wheelhouse-liner-replacement-left) .
  1. If equipped with 4WD, remove the right front wheelhouse liner. Refer to «Front Wheelhouse Liner Replacement - Right Side»(/cadillac/escalade/gmt900-2006-2014/remont/frames-subframes-crossmembers/#frame-and-underbody) .
  2. Remove the right front wheel and tire. Refer to «Tire and Wheel Removal and Installation»(/cadillac/escalade/gmt900-2006-2014/remont/wheel-tire-system/#tires-wheels__tire-and-wheel-removal-and-installation) .
  3. Working through the wheel well opening, disconnect the engine wiring harness electrical connector (3) from knock sensor.
  4. Remove the knock sensor bolt (739) and knock sensor (718).
  1. Position the knock sensor (718) to the engine block and install the knock sensor bolt (739). Tighten the bolt to 25 N.m (18 lb ft).
  2. Connect the engine wiring harness electrical connector (3) to knock sensor.
  3. Install the right front wheel and tire. Refer to «Tire and Wheel Removal and Installation»(/cadillac/escalade/gmt900-2006-2014/remont/wheel-tire-system/#tires-wheels__tire-and-wheel-removal-and-installation) .
  4. If removed, install the right front wheelhouse liner. Refer to «Front Wheelhouse Liner Replacement - Right Side»(/cadillac/escalade/gmt900-2006-2014/remont/frames-subframes-crossmembers/#frame-and-underbody) .

Scheme 36

Scheme 36: Air Cleaner Element Replacement
Scheme 36: Air Cleaner Element Replacement
CalloutComponent Name
1Air Filter Housing Fastener (Qty: 4) CAUTION: Refer to Fastener Caution . Tighten: 3 N.m(27 lb in)
2Air Filter Element
CAUTION
Refer to Fastener Caution .
  1. Remove the air cleaner outlet duct from the mass air flow (MAF)/intake air temperature (IAT) sensor. Refer to «Air Cleaner Resonator Outlet Duct Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) .
  2. Disconnect the engine wiring harness electrical connector (2) from the MAF/IAT sensor (1).
  3. Pull up on the front of the air cleaner assembly in order to release the retainers (2) from the air cleaner adapter.
  4. Slide the air cleaner assembly forward disengaging the locator (1) from the adapter.
  5. Remove the air cleaner assembly.
  6. If replacing the air cleaner assembly proceed to the following step otherwise proceed to step 5 in the installation procedure.
  7. Loosen the MAF/IAT sensor adapter clamp.
  8. Remove the MAF/IAT sensor and adapter.
  1. If the air cleaner assembly was replaced proceed to the following step otherwise proceed to step 5.
  2. Install the MAF/IAT sensor adapter clamp to the air cleaner assembly.
  3. Install the MAF/IAT sensor
  4. Tighten the MAF/IAT sensor adapter clamp. Tighten: Tighten the clamp to 4 N.m (35 lb in).
  5. Install the air cleaner assembly. Insert the locator (1) on the right rear of the air cleaner into the inboard side of the slot in the adapter bracket. Slide the air cleaner towards the fender to engage the adapter. Push down on the air cleaner in order to install the retainers (2) into the adapter bracket.
  6. Connect the engine wiring harness electrical connector (2) to the MAF/IAT sensor (1).
  7. Install the air cleaner outlet duct. Refer to «Air Cleaner Resonator Outlet Duct Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) .
  1. Remove the intake manifold sight shield. Refer to «Upper Intake Manifold Sight Shield Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/mechanical/#engine-mechanical-53l-60l-62l-repair-instructions-on-vehicle) .
  2. Remove the positive crankcase ventilation (PCV) line (1) from the air cleaner outlet duct.
  3. Remove the radiator inlet hose clamp clip (2) from the air cleaner outlet duct (1).
  4. Loosen the air cleaner outlet duct clamp (1) at the mass air flow (MAF)/intake air temperature (IAT) sensor.
  5. Loosen the air cleaner outlet duct clamp (2) at the throttle body.
  6. Lift up the air cleaner outlet duct at the resonator tab in order to separate the resonator from the stud on the intake manifold.
  7. Remove the air cleaner outlet duct (3) from the throttle body and MAF/IAT sensor.
  1. Install the air cleaner outlet duct (3) to the throttle body and MAF/IAT sensor. Ensure that the resonator tab aligns with the stud on the intake manifold.
  2. Push down on the air cleaner outlet duct resonator directly over the resonator tab in order to secure the resonator to the stud on the intake manifold.
  3. Tighten the air cleaner outlet duct clamp (2) at the throttle body.
  4. Tighten the air cleaner outlet duct clamp (1) at the MAF/IAT sensor. Tighten: Tighten the clamps to 4 N.m (35 lb in).
  5. Install the radiator inlet hose clamp clip (2) to the air cleaner outlet duct (1).
  6. Install the PCV line (1) to the air cleaner outlet duct.
  7. Install the intake manifold sight shield. Refer to «Upper Intake Manifold Sight Shield Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/mechanical/#engine-mechanical-53l-60l-62l-repair-instructions-on-vehicle) .

See also:
• Battery Negative Cable Disconnection and Connection
• Control Module References
• Diagnostic Trouble Code (DTC) List - Vehicle
• DTC P0315
• Cooling System Draining and Filling (Static Fill)
• Fastener Caution
• Upper Intake Manifold Sight Shield Replacement
• Heated Oxygen and Oxygen Sensor Caution
• Lifting and Jacking the Vehicle
• Front Propeller Shaft Replacement
• Excessive Force and Oxygen Sensor Caution
• Knee Bolster Replacement (Cadillac)
• Throttle/Idle Learn
• Gasoline/Gasoline Vapors Warning
• Relieving Fuel Pressure Warning
• Electrical Center Identification Views
• Safety Glasses Warning
• Fuel and Evaporative Emission Hose/Pipe Connection Cleaning Caution
• Fuel Pipe Fitting Warning
• Damage to Fuel Tank Straps Caution
• Transfer Case Assembly Replacement
• Range Selector Lever Cable Replacement
• Brake Pressure Modulator Valve Replacement
• Special Tools
• High Voltage Disabling
• Front Wheelhouse Liner Replacement - Right Side
• High Voltage Enabling
• Ignition System Specifications
• Crankshaft Position System Variation Learn
• Front Wheelhouse Liner Replacement - Left Side
• Tire and Wheel Removal and Installation
• Air Cleaner Resonator Outlet Duct Replacement
• Fuel Pressure Relief (Without CH 48027)
• Fuel Tank Draining

More articles — Engine Performance