Section 237 (Engine Control System & Fuel - 4.8L, 5.3L, 6.0L, Or 6.2L - Troubleshooting & Diagnosis)

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2008 GMC Yukon XL, 2008 GMC Yukon, 2008 Chevrolet Tahoe, 2008 Chevrolet Suburban, and 2008 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.

Symptoms - Engine Controls
- Diagnostic Instructions
- Symptoms Description
- Symptoms Definition
- Symptoms Verification
- Symptoms Testing
- Additional Symptoms Tests
- Poor Fuel Fill Quality
Malfunction Indicator Lamp (MIL) Diagnosis
- Diagnostic Instructions
- Circuit/System Description
- Reference Information
- Circuit/System Verification
- Circuit/System Testing
- Repair Procedures
Engine Cranks But Does Not Run
- Diagnostic Instructions
- Circuit/System Description
- Diagnostic Aids
- Reference Information
- Circuit/System Verification
- Circuit/System Testing
- Repair Procedures
Powertrain Relay Diagnosis
- Diagnostic Instructions
- Typical Scan Tool Data
- Circuit/System Description
- Diagnostic Aids
- Reference Information
- Circuit/System Verification
- Circuit/System Testing
- Repair Procedures
- Repair Verification
Poor Fuel Fill Quality
Fuel Injector Diagnosis (w/CH47976)
- Diagnostic Instructions
- Circuit/System Description
- Reference Information
- Component Testing
  - Fuel Injector Coil Test
  - AFIT Test Procedure
- Repair Procedures
Fuel Injector Diagnosis (w/J39021 or w/Tech 2)
- Diagnostic Instructions
- Circuit/System Description
- Diagnostic Aids
- Reference Information
- Component Testing
- Repair Procedures
Fuel Pump Electrical Circuit Diagnosis
- Diagnostic Instructions
- Diagnostic Fault Information
- Circuit/System Description
- Diagnostic Aids
- Reference Information
- Circuit/System Verification
- Circuit/System Testing
- Repair Procedures
Fuel System Diagnosis (w/o FPCM)
- Diagnostic Instructions
- Circuit/System Description
  - Notes
  - Circuit/System Verification
- Circuit/System Testing
- Repair Procedures
Fuel System Diagnosis (w/FPCM)
- Diagnostic Instructions
- Circuit/System Description
- Reference Information
- Circuit/System Verification
- Circuit/System Testing
- Repair Procedures
Fuel Composition Diagnosis
- System Description
Alcohol/Contaminants-in-Fuel Diagnosis (without Special Tool)
- Description
- Alcohol in Fuel Testing Procedure
- Particulate Contaminants in Fuel Testing Procedure
Alcohol/Contaminants-in-Fuel Diagnosis (with Special Tool)
- Description
- Test Procedure
Electronic Ignition (EI) System Diagnosis
- Diagnostic Instructions
- Circuit/System Description
- Diagnostic Aids
- Reference Information
- Circuit/System Verification
- Circuit/System Testing
- Component Testing
- Repair Procedures
Evaporative Emission System Diagnosis
- Operating Instructions for the Evaporative Emission System Tester (EEST)
- Flowmeter Test - Leak Detection
- Smoke Procedure - Locate the Leak
- Temperature Variation Instructions
Cylinder Deactivation (Active Fuel Management) System Diagnosis
- Diagnostic Instructions
- Circuit Description
- Diagnostic Aids
- Reference Information
- Circuit/System Verification
- Circuit/System Testing
  - Electrical System Testing
- Repair Procedures
Inspection/Maintenance (I/M) System Check
- Diagnostic Instructions
- Description
- Conditions for Updating the I/M System Status
- Monitored Emission Control Systems
- Circuit/System Verification
- Circuit/System Testing
Inspection/Maintenance (I/M) Complete System Set Procedure
- Diagnostic Instructions
- Description
  - Notes
  - I/M Data List
- Conditions for Meeting a Cold Start
- Circuit/System Verification
- Inspection/Maintenance (I/M) System Set Procedure
Inspection/Maintenance (I/M) System DTC Table
Service Bay Test
- Diagnostic Instructions
- Description
- Conditions for Running the Test
- Test Procedure