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Symptom Troubleshooting [Engine) Expand All (for easy ctrl-f) Collapse All Foreword Engine OBD II Monitors Electronic Engine Control (EEC) System On - Board Diagnostic Tests Drive Cycles 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) Manifold Absolute Pressure (Map) Sensor Diagnosis (2.3L) (Codes 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) Heated Oxygen Sensor (Ho2S) Diagnosis (DTC P0131, P0151) Heated Oxygen Sensors (Ho2S) - Upstream Diagnosis (DTC P0133, P0153) Heated Oxygen Sensor (Ho2S) Heater Circuit Diagnosis (DTC P0135, P0141, P0155) Heated Oxygen Sensor (Ho2S) Diagnosis (DTC P0136, P1137, P1138) Adaptive Fuel Control Diagnosis (DTC P0171, P0174) Adaptive Fuel Control Diagnosis (DTC P0172, P0175) Fuel Injector Diagnosis (DTC P0201, P0202, P0203, P0204, P0205, P0206) Fuel Pump (FP) Primary Or Secondary Circuit Diagnosis (DTC P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0316) Misfire Detection Monitor Diagnosis (DTC P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0316) Crankshaft Position (CKP) Sensor Diagnosis (DTC P0320) Knock Sensor Diagnosis (DTC P0325, P0326) Camshaft Position (CMP) Sensor Diagnosis (DTC P0340) Ignition Coil Primary Circuit Diagnosis (DTC P0350) Integrated Ignition Coil 1, 2, 3, Or 4 Diagnosis (DTC P0351, P0352, P0353, P0354) Electric EGR (EEGR) System - 2.3L Diagnosis (DTC P0400, P0403, P1408) Catalyst Efficiency Monitor Diagnosis (DTC P0420, P0430) Evaporative Emission (EVAP) Monitor And System Diagnosis (DTC P0442) Evaporative Emission (EVAP) Canister Purge Solenoid Diagnosis (DTC P0443) EVAP System Diagnosis (DTC P0451, P0461) Fuel Tank Pressure (Ftp) Sensor Diagnosis (DTC P0452) Fuel Tank Pressure (Ftp) Sensor Diagnosis (DTC P0453) Evaporative Emission (EVAP) System Diagnosis (DTC P0455, P1443) Evaporative Emission (EVAP) System Diagnosis (DTC P0457) Fuel Level Input (FLI) Circuit Diagnosis (DTC P0460) Idle Air Control (IAC) Valve Assembly Diagnosis (DTC P0505, P1504, P1507) Powertrain Control Module (Pcm) Diagnosis (DTC P0603, P1633) Brake Pedal Position (BPP) Switch Diagnosis (DTC P0703, P1703) Clutch Pedal Position (CPP) Switch Diagnosis (DTC P0704, P1709) OBDII Drive Cycle Diagnosis (DTC P1000) Data Link Connector (DLC) Diagnosis (DTC P1001) Ho2S Heater (S) Diagnosis (DTC P1127) Heated Oxygen Sensor Ho2S Signals (V6 Only) Diagnosis (DTC P1128) Fuel System Not Switching At Fuel Trim (Rich Or Lean) Diagnosis (DTC P1130, P1150) Heated Oxygen Sensor (Ho2S) Not Switching - Upstream Diagnosis (DTC P1131, P1151) Heated Oxygen Sensor (Ho2S) Not Switching - Upstream Diagnosis (DTC P1132, P1152) Engine Rpm/Vehicle Speed Limiter Diagnosis (DTC P1270) Misfire Detection Monitor Disabled Diagnosis (DTC P1309) Evaporative Emission (EVAP) Monitor And System Diagnosis (DTC P1450) Canister Vent (CV) Solenoid Diagnosis (DTC P1451) A/C Clutch Relay (ACCR) Diagnosis (DTC P1460) A/C Control Signal (ACCS) Diagnosis (DTC P1464) Cooling Fan Diagnosis (2.3L) (DTC P1474) Idle Air Control (IAC) System Diagnosis (DTC P1506) Power Steering Pressure (PSP) Switch (2.3L Only) Diagnosis (DTC P1650, P1651) Transfer Case Range Malfunction - 4X4 Low (4X4L) Diagnosis (DTC P1729, P1781) Transmission Control Switch (TCS) Or Transmission Control Indicator Lamp (TCIL) Circuit Diagnosis (DTC P1780) Symptom Troubleshooting Chart - Engine DRIVEABILITY 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 Compression Test - Interpreting Compression Readings Cylinder Leakage Detection Oil Leak and Valve Stem Seal Test Oil Consumption Test 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 Symptom Troubleshooting Chart - Engine Mechanical Symptom Troubleshooting Chart - Drive Belt Symptom Troubleshooting Chart - Engine Cooling Exhaust System Symptom Chart Evaporative Emission System Inspection Evaporative Emission Symptom Chart Symptom Troubleshooting Chart - Charging System Cooling System Component Test Symptom Troubleshooting Chart - Starting System Symptom Troubleshooting Chart - Cruise Control Symptom Troubleshooting Chart - Powertrain Control Module (Pcm) General Test Index