Engine

All Component Locator

• Engine Controls Component Views
• Engine Controls Components

All Description and Operation

• Alternative Fuel Engine Control Unit
• Engine Control Unit Function Parameters
• Fuel Gauge Description
• Fuel Metering System Component Description
• Fuel Supply Component Description
• Fuel System Description/Operation

All Special Tools and Equipment

• Special Tools

All Visual Identification

• Engine Control Unit Connector End Views
• Engine Controls Connector End Views

Cleaning, Inspection, and Adjustment

• Fuel Tank Inspection

Diagnostic Procedures

• Alternative Fuel (AF) Fuel Pump Relay Diagnosis
• Alternative Fuels (AF) Powertrain On Board (OBD) System Check
• Backfire
• CNG Fuel Gauge Reading Inaccurate
• Cuts Out, Misses
• Dieseling, Run-On
• Fill Valve Filter Diagnosis
• Fuel Gauge Indicates Empty with CNG in Tank
• Fuel Gauge Indicates Full/Above Full at All Times
• Fuel Gauge Relay Diagnosis
• Fuel Gauge Selector Switch/Fuel Indicator Lamp Diagnosis
• Fuel System Diagnosis
• Fuel System Unwanted Switch to Gasoline
• Hard Start
• Hesitation, Sag, Stumble
• Ignition Relay Diagnosis
• Intermittent Conditions
• Lack of Power, Sluggishness, or Sponginess
• Lock-Off Relay Diagnosis
• Malfunction Indicator Lamp Circuit Check
• Poor Fuel Economy
• Rough, Unstable, or Incorrect Idle and Stalling
• Surges/Chuggles
• Symptoms

Diagnostic Trouble Codes

• DTC 12 Diagnostic System Ready
• DTC 13 Function Readiness
• DTC 14 ECT Sensor Circuit High Voltage
• DTC 15 ECT Sensor Circuit Low Voltage
• DTC 16 ECT Excessive Time to Closed Loop
• DTC 21 TP Sensor Circuit High
• DTC 22 TP Sensor Circuit Low
• DTC 23 IAT Sensor Circuit Low Voltage
• DTC 25 IAT Sensor Circuit High Voltage
• DTC 26 TP Sensor Performance
• DTC 32 MAP Sensor Performance
• DTC 33 MAP Sensor Circuit High Voltage
• DTC 34 MAP Sensor Circuit Low Voltage
• DTC 35 MAF System Performance
• DTC 36 MAF Sensor Circuit Low Voltage
• DTC 37 MAF Sensor Circuit High Voltage
• DTC 41 CKP Sensor Circuit
• DTC 42 HO2S Insufficient Activity Bank 1 Sensor 1
• DTC 43 HO2S Heater Circuit Bank 1 Sensor 1
• DTC 44 HO2S Circuit Low Voltage Bank 1 Sensor 1
• DTC 45 HO2S Circuit High Voltage Bank 1 Sensor 1
• DTC 51 Gas Mass Sensor Circuit Low Frequency
• DTC 52 Gas Mass Sensor Circuit High Frequency
• DTC 53 Gas Mass Sensor Circuit Range Performance
• DTC 55 Fuel Trim System Lean
• DTC 56 Fuel Trim System Rich
• DTC 58 AF ECU Failure
• DTC 62 HO2S Heater Circuit Bank 2 Sensor 1
• DTC 63 HO2S Insufficient Activity Bank 2 Sensor 1
• DTC 64 HO2S Circuit Low Voltage Bank 2 Sensor 1
• DTC 65 HO2S Circuit High Voltage Bank 2 Sensor 1

Electrical/Electronic Schematic Diagrams

• Engine Controls Schematic Icons
• Engine Controls Schematic References
• Engine Controls Schematics

Electrical/Electronic Specifications

• Fuel Sending Unit Voltage Factor Versus Pressure at Various Temperature

Mechanical Specifications

• Fastener Tightening Specifications

Other Specifications

• Diagnostic Trouble Code (DTC) List
• Engine Scan Tool Data Definitions
• Engine Scan Tool Data List
• GM SPO Group Numbers

Removal, Installation, and Replacement

• Compressed Natural Gas Tank Filler Pipe Replacement
• Engine Control Unit Adapter Replacement
• Engine Control Unit Bracket Replacement
• Engine Control Unit Replacement
• Evaporative Emission Canister Purge Solenoid Replacement
• Fill Valve Filter Replacement
• Fill Valve Replacement
• Fuel Gauge Selector Switch/Fuel Indicator Lamp Replacement
• Fuel Hoses/Lines Replacement - Gas Mass Sensor/Mixture Control Valve to Gas Distribution Adapter
• Fuel Hoses/Lines Replacement - High Pressure Regulator to Intake Manifold
• Fuel Hoses/Lines Replacement - Intake Manifold to Low Pressure Lock-Off
• Fuel Hoses/Lines Replacement - Manual Shutoff Valve to High Pressure Regulator
• Fuel Hoses/Lines Replacement - Tank to Manual Shutoff Valve
• Fuel Hoses/Pipes Replacement - Low Pressure Regulator to Gas Mass Sensor/Mixture Control Valve
• Fuel Pressure Relief
• Fuel Sender Replacement
• Fuel Tank Replacement
• Fuel Tank Venting
• Gas Distribution Adapter Replacement
• Gas Mass Sensor/Mixture Control Valve and Mounting Bracket Replacement
• Gas Mass Sensor/Mixture Control Valve Mounting Bracket Replacement
• High Pressure Lock-Off Solenoid Replacement
• High Pressure Regulator and Mounting Bracket Replacement
• High Pressure Regulator Filter Replacement
• Low Pressure Lock-Off Solenoid Replacement
• Low Pressure Regulator and Mounting Bracket Replacement
• Low Pressure Regulator Mounting Bracket Replacement
• Manual Shutoff Valve Replacement
• Positive Crankcase Ventilation Make-Up Air Hose Replacement
• Throttle Body Assembly Replacement