For 1990-2009 cars only
Engine
All Component Locator
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
All Visual Identification
Cleaning, Inspection, and Adjustment
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 27 Quad Driver Output
- 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
- DTC 66 Fuel Pressure Sensor Circuit Low Voltage
- DTC 67 Fuel Pressure Sensor Circuit High Voltage
Electrical/Electronic Schematic Diagrams
Electrical/Electronic Specifications
- CNG Temperature Versus Percent Full and PWM Output
- Fuel Sending Unit Voltage Factor Versus Pressure at Various Temperature
- Fuel Temperature Sensor Output Voltage Versus Pressure
- Fuel Temperature Sensor Output Voltage Versus Temperature Resistance
Mechanical 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 Pressure Sensor Replacement
- 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
