Symptom Troubleshooting [Engine)

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
- On-Board Refueling Vapor Recovery (ORVR) Evaporative Emission (EVAP) System
- Exhaust Gas Recirculation (EGR) System Monitor
- Typical Fuel Monitor Malfunction Thresholds:
- Heated Oxygen Sensor (HO2S) Monitor
- Misfire Detection Monitor
- Malfunction Indicator Lamp (MIL)
Electronic Engine Control (EEC) System
- Overview
  - Notes
  - Modifications to OBD II Vehicles
- Powertrain Control Software
- Powertrain Control Hardware
  - Smart Junction Box (SJB)
- Power and Ground Signals
- Fuel Systems
  - Mechanical Returnless Fuel System
- Exhaust Gas Recirculation Systems
- Evaporative Emissions System Outline
  - Overview
- Intake Air Systems
- Positive Crankcase Ventilation System
  - Overview
- Catalyst and Exhaust Systems
  - Overview
- Communication Error
- Vehicle Check/Preparation
  - Visual Checks
  - Vehicle Preparation
- Intermittent Diagnostic Techniques
- On-Board System Readiness
  - Description
- Freeze Frame Data
  - Description
- Output Test Mode
  - Description
- Powertrain Control Module (PCM) Reset
On - Board Diagnostic Tests
- On-Board Diagnostic (OBD) Test Description
- Quick Test
- Key On Engine Off (KOEO) On-Demand Self-Test
- Key On Engine Running (KOER) On-Demand Self-Test
- Brake Pedal Position Test
- Transmission Control Switch Test
- Power Steering Pressure Test
- Continuous Memory Self-Test
- Output Test Mode Procedure
Drive Cycles
- Description of OBD II Drive Cycle
- Drive Cycle Recommendations
- Vehicle Preparation
- OBD II Drive Cycle
- Monitor Repair Verification Drive Cycles
  - Comprehensive Component Monitor Repair Verification Drive Cycle
- EGR Monitor Repair Verification Drive Cycle
- HO2S Monitor Repair Verification Drive Cycle:
- Fuel or Misfire Monitor Repair Verification Drive Cycle:
- EVAP Running Loss System Repair Verification Drive Cycle:
- Catalyst Monitor Repair Verification Drive Cycle:
DTC Index - Powertrain Control Module (Pcm)
DTC Application Chart - Powertrain Control Module (Pcm)
Pcm Tests With Codes
- Notes
- Mass Air Flow (MAF) Sensor Diagnosis (Codes P0102, P0103, P1100, P1101)
  - Notes
  - Mass Air Flow Sensor Specifications
  - Pinpoint Test For DTC P0102, P0103, P1100, P1101
- Manifold Absolute Pressure (Map) Sensor Diagnosis (2.3L) (Codes P0107, P0108, P0109)
  - Notes
  - Pinpont Test For DTC P0107, P0108, P0109
- Intake Air Temperature (IAT) Sensor And Engine Coolant Temperature (ECT)/Cylinder Head Temperature (CHT) Sensor Diagnosis (Codes P0112, P0113, P0117, P0118, P0125, P1112, P1116, P1117, P1285, P1288, P1289, P1290, P1299)
  - Notes
  - Pinpoint Test For DTC P0112, P0113, P0117, P0118, P0125, P1112, P1116, P1117, P1285, P1288, P1289, P1290, P1299
- Throttle Position (TP) Sensor Circuit Diagnosis (DTC P0121, P0122, P0123, P1120, P1121, P1124, P1125)
  - Notes
  - Throttle Position (TP) Sensor Circuit Specifications
  - Pinpoint Test For DTC P0121, P0122, P0123, P1120, P1121, P1124, P1125
- Heated Oxygen Sensor (Ho2S) Diagnosis (DTC P0131, P0151)
  - Notes
  - Pinpoint Test For DTC P0131, P0151
- Heated Oxygen Sensors (Ho2S) - Upstream Diagnosis (DTC P0133, P0153)
  - Notes
  - Pinpoint Test For DTC P0133, P0153
- Heated Oxygen Sensor (Ho2S) Heater Circuit Diagnosis (DTC P0135, P0141, P0155)
  - Notes
  - Pinpoint Test For DTC P0135, P0141, P0155
- Heated Oxygen Sensor (Ho2S) Diagnosis (DTC P0136, P1137, P1138)
  - Notes
  - Pinpoint Test For DTC P0136, P1137, P1138
- Adaptive Fuel Control Diagnosis (DTC P0171, P0174)
  - Notes
  - Pinpoint Test For DTC P0171, P0174
- Adaptive Fuel Control Diagnosis (DTC P0172, P0175)
  - Notes
  - Pinpoint Test For DTC P0172, P0175
- Fuel Injector Diagnosis (DTC P0201, P0202, P0203, P0204, P0205, P0206)
  - Notes
  - Pinpoint Test For DTC P0201, P0202, P0203, P0204, P0205, P0206
- Fuel Pump (FP) Primary Or Secondary Circuit Diagnosis (DTC P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0316)
  - Notes
  - Pinpoint Test For
- Misfire Detection Monitor Diagnosis (DTC P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0316)
  - Notes
  - Pinpoint Test For DTC P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0316
- Crankshaft Position (CKP) Sensor Diagnosis (DTC P0320)
  - Notes
  - Crankshaft Position (CKP) Sensor Specifications
  - Pinpoint Test For DTC P0320
- Knock Sensor Diagnosis (DTC P0325, P0326)
  - Notes
  - Pinpoint Test For DTC P0325, P0326
- Camshaft Position (CMP) Sensor Diagnosis (DTC P0340)
  - Notes
  - Pinpoint Test For DTC P0340
- Ignition Coil Primary Circuit Diagnosis (DTC P0350)
  - Notes
  - Pinpoint Test For DTC P0350
- Integrated Ignition Coil 1, 2, 3, Or 4 Diagnosis (DTC P0351, P0352, P0353, P0354)
  - Notes
  - Integrated Ignition Coil 1, 2, 3, Or 4 Specifications
  - Pinpoint Test For DTC P0351, P0352, P0353, P0354
- Electric EGR (EEGR) System - 2.3L Diagnosis (DTC P0400, P0403, P1408)
  - Notes
  - Pinpoint Test For DTC P0400, P0403, P1408
- Catalyst Efficiency Monitor Diagnosis (DTC P0420, P0430)
  - Notes
  - Pinpoint Test For DTC P0420, P0430
- Evaporative Emission (EVAP) Monitor And System Diagnosis (DTC P0442)
  - Notes
  - Pinpoint Test For DTC P0442
- Evaporative Emission (EVAP) Canister Purge Solenoid Diagnosis (DTC P0443)
  - Notes
  - Pinpoint Test For DTC P0443
- EVAP System Diagnosis (DTC P0451, P0461)
  - Notes
  - Pinpoint Test For DTC P0451, P0461
- Fuel Tank Pressure (Ftp) Sensor Diagnosis (DTC P0452)
  - Notes
  - Pinpoint Test For
- Fuel Tank Pressure (Ftp) Sensor Diagnosis (DTC P0453)
  - Notes
  - Pinpoint Test For DTC P0453
- Evaporative Emission (EVAP) System Diagnosis (DTC P0455, P1443)
  - Notes
  - Pinpoint Test For DTC P0455, P1443
- Evaporative Emission (EVAP) System Diagnosis (DTC P0457)
  - Notes
  - Pinpoint Test For DTC P0457
- Fuel Level Input (FLI) Circuit Diagnosis (DTC P0460)
  - Notes
  - Pinpoint Test For DTC P0460
- Idle Air Control (IAC) Valve Assembly Diagnosis (DTC P0505, P1504, P1507)
  - Notes
  - Pinpoint Test For DTC P0505, P1504, P1507
- Powertrain Control Module (Pcm) Diagnosis (DTC P0603, P1633)
  - Notes
  - Pinpoint Test For DTC P0603, P1633
- Brake Pedal Position (BPP) Switch Diagnosis (DTC P0703, P1703)
  - Notes
  - Pinpoint Test For DTC P0703, P1703
- Clutch Pedal Position (CPP) Switch Diagnosis (DTC P0704, P1709)
  - Notes
  - Pinpoint Test For DTC P0704, P1709
- OBDII Drive Cycle Diagnosis (DTC P1000)
  - Notes
  - Pinpoint Test For DTC P1000
- Data Link Connector (DLC) Diagnosis (DTC P1001)
  - Notes
  - Pinpoint Test For DTC P1001
- Ho2S Heater (S) Diagnosis (DTC P1127)
  - Notes
  - Pinpoint Test For DTC P1127
- Heated Oxygen Sensor Ho2S Signals (V6 Only) Diagnosis (DTC P1128)
  - Notes
  - Pinpoint Test For DTC P1128
- Fuel System Not Switching At Fuel Trim (Rich Or Lean) Diagnosis (DTC P1130, P1150)
  - Notes
  - Pinpoint Test For DTC P1130, P1150
- Heated Oxygen Sensor (Ho2S) Not Switching - Upstream Diagnosis (DTC P1131, P1151)
  - Notes
  - Pinpoint Test For DTC P1131, P1151
- Heated Oxygen Sensor (Ho2S) Not Switching - Upstream Diagnosis (DTC P1132, P1152)
  - Notes
  - Pinpoint Test For DTC P1132, P1152
- Engine Rpm/Vehicle Speed Limiter Diagnosis (DTC P1270)
  - Notes
  - Pinpoint Test For DTC P1270
- Misfire Detection Monitor Disabled Diagnosis (DTC P1309)
  - Notes
  - Pinpoint Test For DTC P1309
- Evaporative Emission (EVAP) Monitor And System Diagnosis (DTC P1450)
  - Notes
  - Pinpoint Test For DTC P1450
- Canister Vent (CV) Solenoid Diagnosis (DTC P1451)
  - Notes
  - Pinpoint Test For DTC P1451
- A/C Clutch Relay (ACCR) Diagnosis (DTC P1460)
  - Notes
  - Pinpoint Test For DTC P1460
- A/C Control Signal (ACCS) Diagnosis (DTC P1464)
  - Notes
  - Pinpoint Test For
- Cooling Fan Diagnosis (2.3L) (DTC P1474)
  - Notes
  - Pinpoint Test For DTC P1474
- Idle Air Control (IAC) System Diagnosis (DTC P1506)
  - Notes
  - Pinpoint Test For DTC P1506
- Power Steering Pressure (PSP) Switch (2.3L Only) Diagnosis (DTC P1650, P1651)
  - Notes
  - Pinpoint Test For DTC P1650, P1651
- Transfer Case Range Malfunction - 4X4 Low (4X4L) Diagnosis (DTC P1729, P1781)
  - Notes
  - Pinpoint Test For DTC P1729, P1781
- Transmission Control Switch (TCS) Or Transmission Control Indicator Lamp (TCIL) Circuit Diagnosis (DTC P1780)
  - Notes
  - Pinpoint Test For DTC P1780
Symptom Troubleshooting Chart - Engine DRIVEABILITY
- 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 Sulfur Smell
- All Supported On - Board System Readiness Tests Not Completed
- Fuel Pump Always Runs
Engine Inspection
Engine Component Test
- Engine Oil Leaks - Fluorescent Oil Additive Method
- Leakage Points - Underhood
- Leakage Points - Under Engine, With Vehicle on Hoist
- Leakage Points - With Transmission and Flywheel Removed
- Compression Test
- Compression Test - Results
  - Notes
  - Compression Pressure Limit Chart
- Compression Test - Interpreting Compression Readings
- Cylinder Leakage Detection
- Oil Leak and Valve Stem Seal Test
- Oil Consumption Test
  - Notes
  - Engine Oil Leaks.
- Excessive Engine Oil Consumption
- Intake Manifold Vacuum Test
- Intake Manifold Vacuum Test - Interpreting Vacuum Gauge Readings
- Oil Pressure Test
- Valve Train Analysis - Engine Off
- Valve Train Analysis - Engine Off, Valve Cover Removed
- 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
- Valve Train Analysis - Engine Running, Rocker Arm
- Camshaft Lobe Lift
- Camshaft Lobe Lift - Valve Tappet, 2.3L, 3.0L and 4.0L Engines
- Timing Chain - 2.3L, 3.0L and 4.0L Engines
- Timing Chain Deflection - 2.3L, 3.0L and 4.0L Engines
Charging System Component Tests
- Battery-Load Test
- Battery-Drain Tests
- Battery-Electronic Drains Which Shut Off When the Battery Cable is Disconnected
- Generator On-Vehicle Tests
- Generator On-Vehicle Tests-Load Test
- Generator On-Vehicle Tests-No-Load Test
- Battery Condition Test
Symptom Troubleshooting Chart - Engine Mechanical
Symptom Troubleshooting Chart - Drive Belt
Symptom Troubleshooting Chart - Engine Cooling
- Engine Cooling
Exhaust System Symptom Chart
- Notes
- Pinpoint Test 1: Restricted Exhaust System Test
Evaporative Emission System Inspection
Evaporative Emission Symptom Chart
- Notes
- Pinpoint Test 1: Excessive Fuel Odor
- Evaporative Emissions System Pinpoint Test Cap 2: Hiss When Opening Fuel Cap
- Evaporative Emissions System Pinpoint Test 3: Unable To Refuel Vehicle
Symptom Troubleshooting Chart - Charging System
Cooling System Component Test
- Fan Clutch Test
- Fan Clutch Test - Minimum Speed Requirement
- Fan Clutch Test - Maximum Speed Requirement
- Charging System Pinpoint Test 1: Battery Is Discharged Or Battery Voltage Is Low
- Charging System Pinpoint Test 2: Charging System Warning Indicator Is On With The Engine Running (Charging System Voltage Does Not Increase)
- Charging System Pinpoint Test 3: Charging System Overcharges (Battery Voltage Is Greater Than 15.5 Volts)
- Charging System Pinpoint Test 4: Charging System Warning Indicator Is On With The Engine Running And The Battery Increases Voltage
- Charging System Pinpoint Test 5: Charging System Warning Indicator Is Off With The Ignition Switch In The Run Position And The Engine Off
- Charging System Pinpoint Test 6: Charging System Warning Indicator Flickers Or Is Intermittent
- Charging System Pinpoint Test 7: Generator Is Noisy
- Charging System Pinpoint Test 8: Radio Interference
Symptom Troubleshooting Chart - Starting System
- Symptom Troubleshooting Chart
Symptom Troubleshooting Chart - Cruise Control
- Cruise Control Self-Test Diagnostics
- Symptom Troubleshooting Chart
Symptom Troubleshooting Chart - Powertrain Control Module (Pcm)
General Test Index
- Notes
- General Pinpoint Test 1: Vehicle Reference Voltage
- General Pinpoint Test 2: Tachometer Output (CTO) Failure
- General Pinpoint Test 3: Malfunction Indicator Lamp (Mil)
- General Pinpoint Test 4: Intermittent
- General Pinpoint Test 5: Fuel Delivery System
- General Pinpoint Test 6: Positive Crankcase Ventilation PCV System
- General Pinpoint Test 7: Pcm Power Relay
- General Pinpoint Test 8: Crankshaft Position (CKP) Sensor
- General Pinpoint Test 9: Fuel Pump Inspection
- Pinpoint Test 10: Fuel Line Pressure/Fuel Pressure Hold Inspection
- General Pinpoint Test 11: Fuel Injector Inspection
- General Pinpoint Test 12: No Start
- General Pinpoint Test 13: Ignition Scope Pinpoint Test