Component_System Leak Test

Engine Controls and Fuel - 3.0L LM2 Diesel | Diagnostic Information and Procedures | Document ID: 5436206 Component/System Leak Test Diagnostic Instructions Perform the Diagnostic System Check prior to using this diagnostic procedure: Diagnostic System Check - Vehicle Review the description of Strategy Based Diagnosis: Strategy Based Diagnosis An overview of each diagnostic category can be found here: Diagnostic Procedure Instructions Circuit/System Description For an overview of the component/system, refer to: Compressor Air Intake Turbocharger System Description The purpose of the Component/System Leak Test is to aid in finding an air leak in the component/system. The following are examples of where leaks can occur. The list is not all encompassing Air Cleaner Outlet Duct Charge Air Cooler Inlet Hose Charge Air Cooler Outlet Air Hose Charge Air Cooler Exhaust Aftertreatment System Exhaust Gas Recirculation System Exhaust Gas Sensor Exhaust System /Pipe /Clamp Exhaust Manifold /Gasket /Clamp Intake Manifold /Gasket /Clamp Intake System /Pipe /Clamp Positive Crankcase Ventilation System Turbocharger & Turbocharger Air Inlet Adapter / Turbocharger Outlet Duct Connector Reference Information Component View Reference Master Electrical Component List Special Tools GE-41413-300 EVAP Cap and Plug Kit GE-52250 Variable Pressure Leak Detector 950080 Adapter 1.5 inch Diameter 950081 Adapter 2.9 inch Diameter 950086 Adapter 1.9 inch Diameter 950094 Adapter Small Oval 960011 Halogen Inspection Light 960084 Block Off Coupler Equivalent regional tools: Special Tools Circuit/System Verification

1. Ignition/Vehicle & All vehicle systems » Off
2. Remove the duct closest to the component: B75C Multifunction Intake Air Sensor — Outlet
3. Install » Appropriate tool: Block Off Adapter @ Intake Air Duct Block Off Adapter @ Tail Pipe
4. Install » GE-52250 Variable Pressure Leak Detector — Hose @ Appropriate tool: Block Off Adapter

Note

Before proceeding with this test, review the tool user manual for Safety Information and Instructions: GE-52250 Variable Pressure Leak Detector The user manual that is supplied with the tool, is also available online, refer to: GM Special Service Tools

5. Install & Setup » GE-52250 Variable Pressure Leak Detector 5.1. Select: 12 V or 120 V AC 5.2. Install » Battery Cable @ C1 Battery or 120 V AC electrical cord @ Electrical outlet 5.3. Install » Compressed Air — Hose 5.4. Flow Control Valve » On

Note

Smoke dissipation occurs at a greater rate as the pressure is increased. Smoke exiting the system may be less visible at higher pressures. 5.5. Adjust » Pressure Regulator Valve — Test Pressure = 14 kPa (2 PSI) 5.6. Press the switch: Vapor Test

Caution

Excessive System Pressure may cause incorrect results and may damage mechanical components or seals.

Note

Allow time for vapor to saturate the system 5.7. Adjust » Pressure Regulator Valve — System Pressure » Less than 34 kPa (5 PSI) & Maintain pressure

Note

To help locate intermittent leaks move related components while applying smoke to the system.

6. Use the special tool: Halogen Inspection Light — Illuminate the area(s) of concern — Induction System or Exhaust System Verify the condition does not exist: Smoke exiting the component/system ⇒ If a condition exists Repair or replace as necessary ⇓ If no condition exists
7. All OK. Repair Instructions Perform the Diagnostic Repair Verification after completing the repair: Diagnostic Repair Verification