Trouble Shooting & Fault Diagnosis
- Foreword
- Engine OBD-II Monitors
- Notes
- Catalyst Efficiency Monitor - Federal Test Procedure
- Comprehensive Component Monitor
- Evaporative Emission (EVAP) Vapor Management Flow System Monitor
- Evaporative Emission (EVAP) Running Loss System Monitor
- Exhaust Gas Recirculation (EGR) System Monitor - Differential Pressure Feedback EGR
- Fuel System Monitor
- Heated Oxygen Sensor (HO2S) Monitor
- Misfire Detection Monitor
- Malfunction Indicator Lamp (MIL)
- Electronic Engine Control (EEC) System
- Overview
- Powertrain Control Software
- Powertrain Control Hardware
- Power And Ground Signals
- Fuel Systems
- Exhaust Gas Recirculation Systems
- Evaporative Emissions System Outline
- Intake Air Systems
- Positive Crankcase Ventilation System
- Catalyst And Exhaust Systems
- Communication Error
- Vehicle Check/Preparation
- Intermittent Diagnostic Techniques
- On-Board System Readiness
- Freeze Frame Data
- Output Test Mode
- Powertrain Control Module (PCM) Reset
- On-Board Diagnostic Tests
- On-Board Diagnostic (OBD) Test Description
- System Pass
- Key On Engine Off (KOEO) On-Demand Self-Test
- Key On Engine Running (KOER) On-Demand Self-Test
- Continuous Memory Self-Test
- Parameter Identification (PID) Access
- Brake On/Off Test
- Transmission Control (O/D OFF) Switch Test
- Power Steering Pressure (PSP) Switch Test
- On-Board Diagnostic Test-New Generation Star (NGS) Tester Hook-Up Procedure
- Retrieving DTCs Procedure
- Retrieve/Clear Continuous DTC Self-Test Procedure
- Key ON Engine OFF Self-Test Procedure
- Key ON Engine Running Self-Test Procedure
- After Repair Procedure
- PID/DATA Monitor And Record Procedure
- Playback Of Stored PIDs Procedure
- Output Test Mode Procedure
- Drive Cycles
- Diagnostic Trouble Code Numbers
- Mass Air Flow (MAF) Sensor
- Intake Air Temperature (IAT) Sensor And Engine Coolant Temperature (ECT) Sensor
- Throttle Position (TP) Sensor Circuit Malfunction
- Heated Oxygen Sensor (Ho2S)
- Upstream Heated Oxygen Sensors (Ho2S)
- Heated Oxygen Sensor (Ho2S) Heater Circuit
- Adaptive Fuel Control
- Flexible Fuel (Ff) Sensor
- Fuel Pump (FP) Primary Or Secondary Circuit
- Misfire Detection Monitor
- Powertrain Control Module (Pcm)
- Camshaft Position (CMP) Sensor Malfunction
- Ignition Coil Primary Circuit Malfunction
- Integrated Ignition Coil 1, 2, 3, Or 4 Failure
- EGR System Malfunction
- Catalyst Efficiency Monitor Malfunction
- Evaporative Emission (EVAP) Monitor And System Malfunction
- Evaporative (EVAP) Emission Canister Purge Solenoid Malfunction
- Fuel Tank Pressure (Ftp) Sensor Malfunction
- Evaporative Emission (EVAP) System Malfunction
- Fuel Level Input (FLI) Circuit Malfunction
- Vehicle Speed Signal Malfunction
- Vehicle Speed Sensor (VSS) Signal Intermittent
- Idle Air Control (IAC) Valve Assembly Malfunction
- Powertrain Control Module (Pcm) Malfunction
- Brake Pedal Position (BPP) Switch Malfunction
- Clutch Pedal Position (CPP) Switch Malfunction
- OBD-II Drive Cycle Malfunction
- Data Link Connector (DLC) Malfunction
- Ho2S Heater(S)
- Heated Oxygen Sensor Ho2S Signals
- Fuel System Not Switching At Fuel Trim (Rich Or Lean)
- Upstream Heated Oxygen Sensor (Ho2S) Not Switching
- Downstream Ho2S
- Anti-Theft System
- Engine Rpm/Vehicle Speed Limiter
- DPFE Sensor Malfunction
- EGR Vacuum Regulator Circuit Malfunction
- Flexible Fuel Evaporative Emission (EVAP) Monitor And System
- Evaporative Emission (EVAP) Monitor And System
- Canister Vent (CV) Solenoid Malfunction
- Wide Open Throttle A/C Cutoff (WAC) Relay Malfunction
- A/C Control Signal (ACCS) Malfunction
- Vehicle Speed Circuit Check
- Idle Air Control (IAC) System Malfunction
- Power Steering Pressure (PSP) Switch (2.5L Only) Malfunction
- 4X4 Low (4X4L) Range Malfunction
- Transmission Control Switch (TCS) Or Transmission Control Indicator Lamp (TCIL) Circuit Malfunction
- Diagnostic Index
- Notes
- Starting Concerns
- Hard Start / Long Crank / Erratic Start / Erratic Crank
- Cranks Normally But Will Not Start
- Unique Idle Concern
- Fast Idle
- Low Idle / Stalls During Deceleration
- Engine Poor DRIVEABILITY
- Backfires
- Lack / Loss Of Power
- Knocking / Pinging
- Poor Fuel Economy
- Emissions Compliance
- Mil/TCIL Never On And Mil/TCIL Always On
- Automatic Transmission Shift Concerns
- Instrumentation
- Exhaust System Concerns
- Fuel Odor In Engine Compartment
- Engine Noise
- A/C Does Not Work
- A/C Always On And A/C Compressor Runs Continuously
- A/C Does Not Cut-Off Under Wide Open Throttle Conditions
- Exterior Lighting Systems
- Exhaust Sulphur Smell
- All Supported On Board System Readiness Tests Not Completed
- Fuel Pump Always Runs
- Engine Inspection
- Engine Component Tests
- Engine Oil Leaks - Fluorescent Oil Additive Method
- Compression Test
- Cylinder Leakage Detection
- Oil Leak And Valve Stem Seal Test
- Oil Consumption Test
- Intake Manifold Vacuum Test
- Excessive Engine Oil Consumption
- Oil Pressure Test
- Valve Train Analysis - Engine Off
- Notes
- Valve Train Analysis - Engine Off, Valve Cover Removed
- Valve Train Analysis - Engine Off, Rocker Arm - 3.0L And 4.0L Engines (Push Rod)
- Valve Train Analysis - Engine Off - 3.0L And 4.0L Engines (Push Rod)
- Valve Train Analysis - Engine Off, Valve Tappets
- Valve Train Analysis - Engine Off, Camshaft-Overhead Camshaft Engines
- Valve Train Analysis - Engine Off, Valve Springs
- Valve Train Analysis - Engine Off, Valve Spring Retainer And Valve Spring Retainer Keys
- Valve Train Analysis - Engine Off, Valves And Cylinder Head
- Valve Train Analysis - Engine Running
- Camshaft Lobe Lift
- Timing Chain - 3.0L And 4.0L Engines
- Timing Chain Deflection - 3.0L and 4.0L Engines
- Timing Belt - 2.5L
- Engine Symptom Chart
- Engine Cooling Symptom Chart
- Exhaust System Symptom Chart
- Evaporative Emission System Leak Test
- Evaporative Emission System Inspection
- Evaporative Emissions Symptom Chart
- Communication Faults
- General Test Index
- Notes
- Test 1: Vehicle Reference Voltage (VREF)
- Test 2: Tachometer Output (CTO) Failure
- Test 3: Malfunction Indicator Lamp (Mil)
- Test 4: Intermittent
- Test 5: Fuel Delivery System
- Test 6: Positive Crankcase Ventilation (PCV) System
- Test 7: Pcm Power Relay
- Test 8: Crankshaft Position (CKP) Sensor
- Test 9: Fuel Pressure Regulator
- Test 10: Fuel Pump Inspection
- Test 11: Fuel Line Pressure / Fuel Pressure Hold Inspection
- Test 12: Fuel Injector Inspection
- Test 13: EGR Valve
- Test 14: EGR Vacuum Regulator (EGRVR) Solenoid Inspection
- Test 15: Differential Pressure Feedback EGR (DPFE) Sensor
- Test 16: No Start
- Test 17: Ignition Scope Test