• 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

For an overview of the component/system, refer to:Fuel System Description

• DTCs related to the following system/component = Not Set
• B23 Camshaft Position Sensor
• B34 Engine Coolant Temperature Sensor
• B52 Heated Oxygen Sensor
• B74 Manifold Absolute Pressure Sensor
• B75C Multifunction Intake Air Sensor
• B150 Fuel Tank Pressure Sensor
• Q12 Evaporative Emission Purge Solenoid Valve
• Q17 Fuel Injector
• Q38 Throttle Body
• Engine Misfire
• Fuel Trim System
• Device controls are not active.
• Engine Coolant Temperature=Warmer than −20°C (−4°F)
• Engine Overspeed=Inactive
• Engine Run Time=For greater than 10 min
• Engine Speed=1,200 to 4,279 RPM
• Evaporative Emission (EVAP) Purge System=Inactive
• Exhaust Camshaft Position=0 to 100°
• Fuel Control Loop Status=Closed Loop
• Fuel level=Greater than 10%
• HO2S Heater Resistance Learn Status=Valid
• Ignition Timing Command=0 to 100°
• Ignition Voltage=Greater than 10 V
• Intake Camshaft Position=--10 to 100°
• MAF Sensor=0 to 1,000 g/s

Frequency the DTC runs=Once—Per ignition cycle—After the running conditions are met

HO2S Data=Greater than a predefined threshold

DTCs listed in the DTC Descriptor category=Type A DTC

DTCs listed in the DTC Descriptor category=Type A DTC

• Inspect for aftermarket devices which may affect the operation of the system.

Engine Controls Schematics

Master Electrical Component List

• Circuit Testing
• Connector Repairs
• Testing for Intermittent Conditions and Poor Connections
• Wiring Repairs

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Control Module References

1. Ignition » On / Vehicle » In Service Mode
2. Verify there are no DTCs set related to the following component/system:
• B23 Camshaft Position Sensor
• B34 Engine Coolant Temperature Sensor
• B52 Heated Oxygen Sensor
• B74 Manifold Absolute Pressure Sensor
• B75C Multifunction Intake Air Sensor
• B150 Fuel Tank Pressure Sensor
• Q12 Evaporative Emission Purge Solenoid Valve
• Q17 Fuel Injector
• Q38 Throttle Body
• Engine Misfire
• Fuel Trim System
• If a related DTC is set

  Refer to:Diagnostic Trouble Code (DTC) List - Vehicle

• If a related DTC is not set
3. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

   Verify DTC P219A, P219B is not set

• If the DTC sets

  Refer to: Circuit/System Testing

• If no DTC is set
4. All OK.

1. Ignition » On / Vehicle » In Service Mode
2. Verify the scan tool parameter:MAP Sensor=56 to 105 kPa (8.1 to 15.2 PSI)
• If not in the specified range

  Refer to:DTC P0106, P0107, or P0108

• If in the specified range
3. Verify the following conditions do not exist:
• Q17 Fuel Injector—Restricted»Refer to:Fuel System Diagnosis
• Q38 Throttle Body—Vacuum leak
• Exhaust System—Cracked/Leaking/Loose Clamps/Missing components/Restricted»Refer to:Symptoms - Engine Exhaust
• Fuel—Contaminated/Poor Quality—Refer to:Alcohol/Contaminants-in-Fuel Diagnosis
• Fuel injectors which do not close completely.»Refer to:Fuel Injector Diagnosis
• Ignition System=Malfunction»Refer to:Electronic Ignition System Diagnosis
• Intake Air Duct—Blocked/Collapsed/Loose Clamps/Visible Damage
• MAF Sensor=Contamination of the measuring element
• Positive Crankcase Ventilation System—Leaking/Restricted»Refer to:Crankcase Ventilation System Inspection/Diagnosis
• Vacuum Hoses—Kinked/Leaking/Incorrect connection
• If a condition exists » Repair or replace as necessary
• If no condition exists
4. Refer to:Symptoms - Engine Mechanical

• Perform the Diagnostic Repair Verification after completing the repair:Diagnostic Repair Verification