Electronic Diagnostics

• Important (NGC)
• Introduction
  • Notes
  • System Coverage
  • Six-Step Troubleshooting Procedure
• Identification Of System
• System Description & Functional Operation
  • General Description
  • Functional Operation
    • Fuel Control
    • On-Board Diagnostics
      • Notes
      • MIL Lamp Strategy
    • OBD II/Euro Stage III OBD Monitor Information
  • OBDII Monitor Run Process
    • NGC Vehicle
  • A. Natural Vacuum Leak Detection With Purge Monitor
  • B. Catalyst/02 Monitor
  • C. EGR Monitor
  • D. 02 Sensor Heater Monitor
    • Notes
    • Other Controls
      • Charging System (NGC)
      • 02 Sensor (NGC)
      • Speed Control System
      • Turbocharger System 2.4L (NCG)
    • Natural Vacuum Leak Detection (NVLD) (NGC)
    • The NVLD Utilizes The Gas Law Principles
    • The NVLD Device And How It Functions
    • The PCM'S Role In NVLD Diagnosis:
    • NVLD Leak Detection
      • Small Leak Test (Passive)
      • Rationality Tests
      • Medium and Large Leak Test (Intrusive)
      • NVLD Assembly Internal Schematic
    • Pcm Operating Modes
    • Non-Monitored Circuits
    • Skis Overview
    • Skim On-Board Diagnostics
    • Skis Operation
    • Programming The Powertrain Control Module
    • Programming The Sentry Key Immobilizer Module
    • Programming The Ignition Keys To The Sentry Key Immobilizer Module
  • Diagnostic Trouble Codes
    • Notes
    • Hard Code
    • Intermittent Code
    • Starts Since Set Counter
    • DISTANCE SINCE Ml SET
  • Using The DRBIII®
  • DRBIII® Error Messages And Blank Screen
    • Notes
    • DRBIII® Does Not Power Up
    • Display Is Not Visible
• Disclaimers, Safety, Warnings
  • Disclaimers
  • Safety
    • Technician Safety Information
    • Vehicle Preparation For Testing
    • Servicing Sub Assemblies
    • DRBIII® Safety Information
  • Warnings And Cautions
    • Road Test Warnings
    • Vehicle Damage Cautions
• Required Tools & Equipment
• Glossary Of Terms
• Diagnostic Information & Procedures
  • DTC Definitions
  • Communication
    • *No Response From Pcm (PCI Bus) - NGC
      • Possible Causes
      • Testing
    • *No Response From Pcm (Pcm Sci Bus) - NGC
      • Possible Causes
      • Testing
    • *No Response From Sentry Key Immobilizer Module
      • Possible Causes
      • Testing
    • *No Response From Transmission Control Module - NGC
      • Possible Causes
      • Testing
    • *PCI Bus Communication Failure
      • Possible Causes
      • Testing
  • DRIVEABILITY - NGC
    • Intermittent Condition
      • Possible Causes
      • Testing
    • DTC P0016: Crankshaft/Camshaft Timing Misalignment
      • When Monitored And Set Condition
      • Possible Causes
      • Testing
    • DTC P0031: O2 Sensor 1/1 Heater Circuit Low Or DTC P0037: O2 Sensor 1/2 Heater Circuit Low
      • Notes
      • When Monitored And Set Condition
        • P0031-O2 Sensor 1/1 Heater Circuit Low
        • P0037-O2 Sensor 1/2 Heater Circuit Low
      • Possible Causes
      • Testing
    • DTC P0032: O2 Sensor 1/1 Heater Circuit High Or DTC P0038: O2 Sensor 1/2 Heater Circuit High
      • Notes
      • When Monitored And Set Condition
        • P0032-O2 Sensor 1/1 Heater Circuit High
        • P0038-O2 Sensor 1/2 Heater Circuit High
      • Possible Causes
      • Testing
    • DTC P0033: Surge Valve Solenoid Circuit
      • When Monitored And Set Condition
      • Possible Causes
      • Testing
    • DTC P0068: Manifold Pressure/Throttle Position Correlation
      • When Monitored And Set Condition
      • Possible Causes
      • Testing
    • DTC P0071: Ambient Temp Sensor Performance
      • When Monitored And Set Condition
      • Possible Causes
      • Testing
    • DTC P0072: Ambient Temp Sensor Low
      • When Monitored And Set Condition
      • Possible Causes
      • Testing
    • DTC P0073: Ambient Temp Sensor High
      • When Monitored And Set Condition
      • Possible Causes
      • Testing
    • DTC P0107: Map Sensor Low
      • When Monitored And Set Condition
      • Possible Causes
      • Testing
    • DTC P0108: Map Sensor High
      • When Monitored And Set Condition
      • Possible Causes
      • Testing
    • DTC P0111: Intake Air Temperature Sensor Performance
      • When Monitored And Set Condition
      • Possible Causes
      • Testing
    • DTC P0112: Intake Air Temperature Sensor Low
      • When Monitored And Set Condition
      • Possible Causes
      • Testing
    • DTC P0113: Intake Air Temperature Sensor High
      • When Monitored And Set Condition
      • Possible Causes
      • Testing
    • DTC P0116: Engine Coolant Temperature Performance
      • When Monitored And Set Condition
      • Possible Causes
      • Testing
    • DTC P0117: Engine Coolant Temperature Sensor Low
      • When Monitored And Set Condition
      • Possible Causes
      • Testing
    • DTC P0118: Engine Coolant Temperature Sensor High
      • When Monitored And Set Condition
      • Possible Causes
      • Testing
    • DTC P0122: Throttle Position Sensor #1 Low
      • When Monitored And Set Condition
      • Possible Causes
      • Testing
    • DTC P0123: Throttle Position Sensor #1 High
      • When Monitored And Set Condition
      • Possible Causes
      • Testing
    • DTC P0125: Insufficient Coolant Temp For Closed-Loop Fuel Control
      • When Monitored And Set Condition
      • Possible Causes
      • Testing
    • DTC P0128: Thermostat Rationality
      • When Monitored And Set Condition
      • Possible Causes
      • Testing
    • DTC P0129: Barometric Pressure Out-Of-Range
      • When Monitored And Set Condition
      • Possible Causes
      • Testing
    • DTC P0131: O2 Sensor 1/1 Voltage Low Or DTC P0137: O2 Sensor 1/2 Voltage Low
      • Notes
      • When Monitored And Set Condition
        • P0131-O2 Sensor 1/1 Voltage Low
        • P0137-O2 Sensor 1/2 Voltage Low
      • Possible Causes
      • Testing
    • DTC P0132: O2 Sensor 1/1 Voltage High Or DTC P0138: O2 Sensor 1/2 Voltage High
      • Notes
      • When Monitored And Set Condition
        • P0132-O2 Sensor 1/1 Voltage High
        • P0138-O2 Sensor 1/2 Voltage High
      • Possible Causes
      • Testing
    • DTC P0133: O2 Sensor 1/1 Slow Response Or DTC P0139: O2 Sensor 1/2 Slow Response
      • Notes
      • When Monitored And Set Condition
        • P0133-O2 Sensor 1/1 Slow Response
        • P0139-O2 Sensor 1/2 Slow Response
      • Possible Causes
      • Testing
    • DTC P0135: O2 Sensor 1/1 Heater Performance Or DTC P0141: O2 Sensor 1/2 Heater Performance
      • Notes
      • When Monitored And Set Condition
        • P0135-O2 Sensor 1/1 Heater Performance
        • P0141-O2 Sensor 1/2 Heater Performance
      • Possible Causes
      • Testing
    • DTC P0171: Fuel System 1/1 Lean
      • When Monitored And Set Condition
      • Possible Causes
      • Testing
    • DTC P0172: Down Stream Fuel System 1/2 Rich Or DTC P2096: Down Stream Fuel System 1/2 Lean
      • Notes
      • When Monitored And Set Condition
        • P0172-Down Stream Fuel System 1/2 Rich
        • P2096-Down Stream Fuel System 1/2 Lean
      • Possible Causes
      • Testing
    • DTC P0172: Fuel System 1/1 Rich
      • When Monitored And Set Condition
      • Possible Causes
      • Testing
    • DTC P0201: Fuel Injector #1, DTC P0202: Fuel Injector #2, DTC P0203: Fuel Injector #3 Or DTC P0204: Fuel Injector #4
      • Notes
      • When Monitored And Set Condition
        • P0201-Fuel Injector #1
        • P0202-Fuel Injector #2
        • P0203-Fuel Injector #3
        • P0204-Fuel Injector #4
      • Possible Causes
      • Testing
    • DTC P0234: OVERBOOST Performance, DTC P1106: BARO Solenoid Performance Or DTC P1188: Tip Sensor Performance
      • Notes
      • When Monitored And Set Condition
        • P0234-OVERBOOST Performance
        • P1106-BARO Solenoid Performance
        • P1188-Tip Sensor Performance
      • Possible Causes
      • Testing
    • DTC P0243: WASTEGATE Solenoid Circuit
      • When Monitored And Set Condition
      • Possible Causes
      • Testing
    • DTC P0300: Multiple Cylinder Misfire, DTC P0301: Cylinder #1 Misfire, DTC P0302: Cylinder #2 Misfire, DTC P0303: Cylinder #3 Misfire Or DTC P0304: Cylinder #4 Misfire
      • Notes
      • When Monitored And Set Condition
        • P0300-Multiple Cylinder Misfire
        • P0301-Cylinder #1 Misfire
        • P0302-Cylinder #2 Misfire
        • P0303-Cylinder #3 Misfire
        • P0304-Cylinder #4 Misfire
      • Possible Causes
      • Testing
    • DTC P0315: No Crank Sensor Learned
      • When Monitored And Set Condition
      • Possible Causes
      • Testing
    • DTC P0325: Knock Sensor #1 Circuit
      • When Monitored And Set Condition
      • Possible Causes
      • Testing
    • DTC P0335: Crankshaft Position Sensor Circuit
      • When Monitored And Set Condition
      • Possible Causes
      • Testing
    • DTC P0339: Crankshaft Position Sensor Intermittent
      • When Monitored And Set Condition
      • Possible Causes
      • Testing
    • DTC P0340: Camshaft Position Sensor Circuit
      • When Monitored And Set Condition
      • Possible Causes
      • Testing
    • DTC P0344: Camshaft Position Sensor Intermittent
      • When Monitored And Set Condition
      • Possible Causes
      • Testing
    • DTC P0351: Ignition Coil #1 Circuit Or DTC P0352: Ignition Coil #2 Circuit
      • Notes
      • When Monitored And Set Condition
        • P0351-Ignition Coil #1 Circuit
        • P0352-Ignition Coil #2 Circuit
      • Possible Causes
      • Testing
    • DTC P0420: Catalytic 1/1 Efficiency
      • When Monitored And Set Condition
      • Possible Causes
      • Testing
    • DTC P0440: General EVAP System Failure
      • When Monitored And Set Condition
      • Possible Causes
      • Testing
    • DTC P0441: EVAP Purge System Performance
      • When Monitored And Set Condition
      • Possible Causes
      • Testing
    • DTC P0442: EVAP System Medium Leak Or DTC P0455: EVAP System Large Leak
      • Notes
      • When Monitored And Set Condition
        • P0442-EVAP System Medium Leak
        • P0455-EVAP System Large Leak
      • Possible Causes
      • Testing
    • DTC P0443: EVAP Purge Solenoid Circuit
      • When Monitored And Set Condition
      • Possible Causes
      • Testing
    • DTC P0452: NVLD Pressure Switch Sense Circuit Low
      • When Monitored And Set Condition
      • Possible Causes
      • Testing
    • DTC P0453: NVLD Pressure Switch Sense Circuit High
      • When Monitored And Set Condition
      • Possible Causes
      • Testing
    • DTC P0456: EVAP System Small Leak
      • When Monitored And Set Condition
      • Possible Causes
      • Testing
    • DTC P0461: Fuel Level Sensor #1 Performance
      • When Monitored And Set Condition
      • Possible Causes
      • Testing
    • DTC P0462: Fuel Level Sensor #1 Low Or DTC P0463: Fuel Level Sensor #1 High
      • Notes
      • When Monitored And Set Condition
        • P0462-Fuel Level Sensor #1 Low
        • P0463-Fuel Level Sensor #1 High
      • Possible Causes
      • Testing
    • DTC P0480: Cooling Fan 1 Control Circuit
      • When Monitored And Set Condition
      • Possible Causes
      • Testing
    • DTC P0481: Cooling Fan 2 Control Circuit
      • When Monitored And Set Condition
      • Possible Causes
      • Testing
    • DTC P0498: NVLD Canister Vent Valve Solenoid Circuit Low
      • When Monitored And Set Condition
      • Possible Causes
      • Testing
    • DTC P0499: NVLD Canister Vent Valve Solenoid Circuit High
      • When Monitored And Set Condition
      • Possible Causes
      • Testing
    • DTC P0501: Vehicle Speed Sensor #1 Performance (Auto Trans)
      • When Monitored And Set Condition
      • Possible Causes
      • Testing
    • DTC P0501: Vehicle Speed Sensor #1 Performance (Manual Trans)
      • When Monitored And Set Condition
      • Possible Causes
      • Testing
    • DTC P0506: Idle Speed Low Performance Or DTC P0507: Idle Speed High Performance
      • Notes
      • When Monitored And Set Condition
        • P0506-Idle Speed Low Performance
        • P0507-Idle Speed High Performance
      • Possible Causes
      • Testing
    • DTC P0508: IAC Valve Sense Circuit Low
      • When Monitored And Set Condition
      • Possible Causes
      • Testing
    • DTC P0509: IAC Valve Sense Circuit High
      • When Monitored And Set Condition
      • Possible Causes
      • Testing
    • DTC P0513: Invalid Skim Key
      • When Monitored And Set Condition
      • Possible Causes
      • Testing
    • DTC P0516: Battery Temperature Sensor Low
      • When Monitored And Set Condition
      • Possible Causes
      • Testing
    • DTC P0517: Battery Temperature Sensor High
      • When Monitored And Set Condition
      • Possible Causes
      • Testing
    • DTC P0522: Oil Pressure Sensor Low
      • When Monitored And Set Condition
      • Possible Causes
      • Testing
    • DTC P0551: Power Steering Switch Performance
      • When Monitored And Set Condition
      • Possible Causes
      • Testing
    • DTC P0562: Battery Voltage Low
      • When Monitored And Set Condition
      • Possible Causes
      • Testing
    • DTC P0563: Battery Voltage High
      • When Monitored And Set Condition
      • Possible Causes
      • Testing
    • DTC P0580: Speed Control Switch #1 Low
      • When Monitored And Set Condition
      • Possible Causes
      • Testing
    • DTC P0581: Speed Control Switch #1 High
      • When Monitored And Set Condition
      • Possible Causes
      • Testing
    • DTC P0582: Speed Control Vacuum Solenoid Circuit
      • When Monitored And Set Condition
      • Possible Causes
      • Testing
    • DTC P0586: Speed Control Vent Solenoid Circuit
      • When Monitored And Set Condition
      • Possible Causes
      • Testing
    • DTC P0594: Speed Control Servo Power Circuit
      • When Monitored And Set Condition
      • Possible Causes
      • Testing
    • DTC P0600: Serial Communication Link Or DTC P0601: Internal Memory Checksum Invalid
      • Notes
      • When Monitored And Set Condition
        • P0600-Serial Communication Link
        • P0601-Internal Memory Checksum Invalid
      • Possible Causes
      • Testing
    • DTC P0622: Generator Field Control Circuit
      • When Monitored And Set Condition
      • Possible Causes
      • Testing
    • DTC P0627: Fuel Pump Relay Circuit
      • When Monitored And Set Condition
      • Possible Causes
      • Testing
    • DTC P0630: VIN Not Programmed In Pcm
      • When Monitored And Set Condition
      • Possible Causes
      • Testing
    • DTC P0632: Odometer Not Programmed In Pcm
      • When Monitored And Set Condition
      • Possible Causes
      • Testing
    • DTC P0633: Skim Key Not Programmed In Pcm
      • When Monitored And Set Condition
      • Possible Causes
      • Testing
    • DTC P0645: A/C Clutch Relay Circuit
      • When Monitored And Set Condition
      • Possible Causes
      • Testing
    • DTC P0685: ASD Relay Control Circuit
      • When Monitored And Set Condition
      • Possible Causes
      • Testing
    • DTC P0688: ASD Relay Sense Circuit Low
      • When Monitored And Set Condition
      • Possible Causes
      • Testing
    • DTC P0700: Transmission Control System/Read Transmission DTCS On The DRBIII®
      • Testing
    • DTC P0850: Park/Neutral Switch Performance
      • Notes
      • When Monitored And Set Condition
      • Possible Causes
      • Testing
    • DTC P1105: Tip Sensor Solenoid Circuit
      • Notes
      • When Monitored And Set Condition
      • Possible Causes
      • Testing
    • DTC P1115: General Temp Sensor Performance
      • When Monitored And Set Condition
      • Possible Causes
      • Testing
    • DTC P1187: Throttle Inlet Pressure/Map Correlation
      • When Monitored And Set Condition:
      • Possible Causes
      • Testing
    • DTC P1189: Tip Sensor Circuit Low
      • When Monitored And Set Condition
      • Possible Causes
      • Testing
    • DTC P1190: Tip Sensor Circuit High
      • When Monitored And Set Condition
      • Possible Causes
      • Testing
    • DTC P1602: Pcm Not Programmed
      • When Monitored And Set Condition
      • Possible Causes
      • Testing
    • DTC P1603: Pcm Internal Dual-Port Ram Communication, DTC P1604: Pcm Internal Dual-Port Ram Read/Write Integrity Failure Or DTC P1607: Pcm Internal Shutdown Timer Rationality
      • Notes
      • When Monitored And Set Condition
      • Possible Causes
      • Testing
    • DTC P1696: EEPROM Memory Write Denied/Invalid Or DTC P1697: EMR (Sri) Mileage Not Stored
      • Notes
      • When Monitored And Set Condition
        • P1696-EEPROM Memory Write Denied/Invalid
        • P1697-EMR (Sri) Mileage Not Stored
      • Possible Causes
      • Testing
    • DTC P1854: Tip BARO Out Of Range
      • When Monitored And Set Condition
      • Possible Causes
      • Testing
    • DTC P2074: Manifold Pressure/Throttle Position Correlation - High Flow/Vacuum Leak
      • When Monitored And Set Condition
      • Possible Causes
      • Testing
    • DTC P2302: Ignition Coil #1 Secondary Circuit-Insufficient Ionization Or DTC P2305: Ignition Coil #2 Secondary Circuit-Insufficient Ionization
      • When Monitored And Set Condition
        • Notes
        • P2302-Ignition Coil #1 Secondary Circuit-Insufficient Ionization
        • P2305-Ignition Coil #2 Secondary Circuit-Insufficient Ionization
      • Possible Causes
      • Testing
    • DTC P2503: Charging System Voltage Low
      • When Monitored And Set Condition
      • Possible Causes
      • Testing
    • DTC U0101: No Transmission Bus Message
      • When Monitored And Set Condition
      • Possible Causes
      • Testing
    • DTC U0155: No Cluster Bus Message
      • When Monitored And Set Condition
      • Possible Causes
      • Testing
    • DTC U0168: No Skim Bus Messages
      • When Monitored And Set Condition
      • Possible Causes
      • Testing
    • DTC U110C: No Fuel Level Bus Message
      • When Monitored And Set Condition
      • Possible Causes
      • Testing
    • *Checking Pcm Power And Ground Circuits
      • Possible Causes
      • Testing
    • *Checking Radiator Fan Relay Output
      • Possible Causes
      • Testing
    • *Checking The A/C Relay Output
      • Possible Causes
      • Testing
  • Sentry Key Immobilizer
    • Antenna Failure, Cop Failure, EEPROM Failure, Internal Fault, Ram Failure, Serial Link Internal Fault Or Stack Overflow Failure
      • Notes
      • When Monitored And Set Condition
        • Antenna Failure
        • Cop Failure
        • EEPROM Failure
        • Internal Fault
        • Ram Failure
        • Serial Link Internal Fault
        • Stack Overflow Failure
      • Possible Causes
      • Testing
    • Pcm Status Failure Or Serial Link External Fault
      • Notes
      • When Monitored And Set Condition
        • Pcm Status Failure
        • Serial Link External Fault
      • Possible Causes
      • Testing
    • Rolling Code Failure Or VIN Mismatch
      • Notes
      • When Monitored And Set Condition
        • Rolling Code Failure
        • VIN Mismatch
      • Possible Causes
      • Testing
    • Transponder Communication Failure, Transponder Cyclic Redundancy Check (CRC) Failure, Transponder Id Mismatch Or Transponder Response Mismatch
      • Notes
      • When Monitored And Set Condition
        • Transponder Communication Failure
        • Transponder Cyclic Redundancy Check (CRC) Failure
        • Transponder Id Mismatch
        • Transponder Response Mismatch
      • Possible Causes
      • Testing
    • *Checking Fuel Delivery
      • Possible Causes
      • Testing
  • Starting
    • Checking Fuel Pressure Leak Down
      • Possible Causes
      • Testing
    • *Checking Hard Start (Fuel Delivery System)
      • Possible Causes
      • Testing
    • *Engine Cranks Does Not Start
      • Possible Causes
      • Testing
    • *No Crank Condition
      • Possible Causes
      • Testing
    • *No Response From Pcm With A No Start Condition
      • Possible Causes
      • Testing
    • *Start And Stall Condition
      • Possible Causes
      • Testing
• Verification Tests
• Component Locations
  • Powertrain And Skim
  • Control And Solenoids
  • Data Link Connector
  • Sensors
  • Fuel System
  • Relays
  • Switches
• Connector PINOUTS
• Wiring Diagrams