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Engine Control System Diagnosis Expand All (for easy ctrl-f) Collapse All Precautions General Description Schematic and Routing Diagram Component Location Diagnostic Information and Procedures Engine and Emission Control System Check Malfunction Indicator Lamp (MIL) Check DTC Check DTC Clearance DTC Table Fail-Safe Table Scan Tool Data ECM Scan Tool Data Definitions Fuel System (Fuel System Status) Short Term Fuel Trim (%) Long Term Fuel Trim (%) Total Fuel Trim (%) Inj Pulse Width (Fuel Injection Pulse Width, msec.) Ignition Advance (Ignition Timing Advance for NO. 1 Cylinder, ° BTDC) Calculated Load (Calculated Load Value, %) Engine Speed (RPM) Desired Idle (Desired Idle Speed, RPM) MAF (Mass Air Flow rate, g/sec, lb/min.) Vehicle Speed (km/h, mph) ECT (Engine Coolant Temperature, °C, °F) Intake Air Temperature. (°C, °F) Barometric Pres (kPa, mm Hg, in Hg, bar) Evap Canist Prg Duty (Evap Canister Purge Flow Duty, %) VVT Gap (Target Actual Position, °) IMRC Valve (Intake Manifold Runner Control Valve, V) IMRC Valve (Com) (Intake Manifold Runner Control Command, Open/Close) IMRC Valve (Mon) (Intake Manifold Runner Control Valve Monitor, Open/Closed) IAC Throttle Opening (Idle Air Throttle Valve Opening, %) TP Sensor 1 Volt (TP Sensor (Main) Output Voltage, V) TP Sensor 2 Volt (TP Sensor (SUB) Output Voltage, V) APP Sensor 1 Volt (APP Sensor (Main) Output voltage, V) APP Sensor 2 Volt (APP Sensor (sub) Output Voltage, V) Accel Position (Absolute Accelerator Pedal Position, %) Throttle Position (Absolute Throttle Position, %) Target throttle Posi (Target throttle Valve Position, %) Throttle Motor Volt (Throttle Motor Supply Voltage) (V) O2S B1 S2 (Ho2S, V) A/F B1 S1 Current (A/F Sensor Output Current, mA) Battery Voltage (V) A/C Pressure (A/C Refrigerant Absolute Pressure, kPa) Generator Cont Duty (Generator Control Duty, %) Generator Field Duty (Generator Field Coil Duty, %) Leak check P sensor (EVAP Leak check Pressure sensor, in.Hg, kPa) Radiator Fan (Radiator Cooling Fan Control Relay, Low/Mid/Hi) A/C Comp Relay (A/C Compressor Relay, On/Off) Leak Check Pump (Mon) (EVAP Leak Detection Pump, On/Off) Fuel Pump (On/Off) IMT Valve Actuator (Intake Manifold Tuning Valve, Open/Close) Throttle Motor Relay (On/Off) Starter SW (Starter Switch, ON/OFF) PSP Switch (P/S signal) (Power Steering Pump Pressure Switch, On/Off) A/C Switch (On/Off) Blower Fan (On/Off) Brake Switch (On/Off) Electric Load (On/Off) PNP Signal (P/N or D range) (A/T model) Fuel Cut (On/Off) Closed Throttle Pos (Closed Throttle Position, On/Off) O2S B1 S2 ACT (HO2S, Active/Inactive) A/F B1 S1 ACT (A/F Sensor, Active/Inactive) Visual Inspection Engine Basic Inspection Engine Symptom Diagnosis MIL Does Not Come ON with Ignition Switch in ON Position and Engine Stopped (but Engine can be Started) MIL Remains ON after Engine Starts DTC P0010: Camshaft Position Actuator Circuit DTC P0011: Camshaft Position - Timing Over-Advanced or System Performance; DTC P0012: Camshaft Position - Timing Over-retarded DTC P0016: Crankshaft Position-Camshaft Position Correlation DTC P0031: HO2S Heater Control Circuit Low (Bank-1 Sensor-1); DTC P0032: HO2S Heater Control Circuit High (Bank-1 Sensor-1) DTC P0037: HO2S Heater Control Circuit Low (Bank-1 Sensor-2); DTC P0038: HO2S Heater Control Circuit High (Bank-1 Sensor-2) DTC P0101: Mass or Volume Air Flow Circuit Range / Performance DTC P0102: Mass or Volume Air Flow Circuit Low input; DTC P0103: Mass or Volume Air Flow Circuit High input DTC P0111: Intake Air Temperature Sensor 1 Circuit Range Performance DTC P0112: Intake Air Temperature Sensor 1 Circuit Low; DTC P0113: Intake Air Temperature Sensor 1 Circuit High DTC P0116: Engine Coolant Temperature Circuit Range/Performance; DTC P0125: Insufficient Coolant Temperature for Closed Loop Fuel Control; DTC P0128: Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature) DTC P0117: Engine Coolant Temperature Sensor Circuit Low; P0118: Engine Coolant Temperature Sensor Circuit High DTC P011B: Engine Coolant Temperature Circuit Performance at Engine Soaking DTC P0122: Throttle / Pedal Position Sensor / Switch "A" (Main) Circuit Low; P0123: Throttle / Pedal Position Sensor / Switch "A" (Main) Circuit High DTC P0131: O2 Sensor (HO2S) Circuit Low Voltage (Bank-1 Sensor-1); DTC P0132: O2 Sensor (HO2S) Circuit High Voltage (Bank-1 Sensor-1); DTC P0134: O2 Sensor (HO2S) No Activity Detected (Bank-1 Sensor-1); DTC P2195: O2 Sensor Signal Stuck Lean (Bank-1 Sensor-1); DTC P2196: O2 Sensor Signal Stuck Rich (Bank-1 Sensor-1); DTC P2237: O2 Sensor Positive Current Control Circuit/Open DTC P0133: O2 Sensor Circuit Slow Response DTC P0137: O2 Sensor Circuit Voltage Low (Bank 1, Sensor 2); DTC P0138: O2 Sensor Circuit Voltage High (Bank 1, Sensor 2) DTC P0139: O2 Sensor Circuit Slow Response (Bank-1 Sensor-2), DTC P013E: O2 Sensor Delayed Response - Rich To Lean (Bank-1 Sensor-2) DTC P0171: System Too Lean; DTC P0172: System Too Rich DTC P0222: Throttle / Pedal Position Sensor / Switch "B" Circuit Low; P0223: Throttle / Pedal Position Sensor / Switch "B" Circuit High DTC P0300: Random / Multiple Cylinder Misfire Detected; P0301: Cylinder 1 Misfire Detected; P0302: Cylinder 2 Misfire Detected; P0303: Cylinder 3 Misfire Detected; P0304: Cylinder 4 Misfire Detected DTC P0327: Knock Sensor 1 Circuit Low; P0328: Knock Sensor 1 Circuit High DTC P0335: Crankshaft Position Sensor "A" Circuit DTC P0340: Camshaft Position Sensor "A" Circuit DTC P0420: Catalyst System Efficiency Below Threshold DTC P0441: Evaporative Emission System Incorrect Purge Flow DTC P0443: Evaporative Emission System Purge Control Valve Circuit DTC P0449: Evaporative Emission System Vent Valve / Solenoid Circuit DTC P0456: Evaporative Emission System Leak Detected (Very Small Leak) DTC P0461: Fuel Level Sensor "A" Circuit Performance DTC P0462: Fuel Level Sensor "A" Circuit Low; P0463: Fuel Level Sensor "A" Circuit High DTC P0480: Fan 1 Control Circuit DTC P0481: Fan 2 Control Circuit DTC P0482: Fan 3 Control Circuit DTC P0500: Vehicle Speed Sensor "A" DTC P0506: Idle Air Control System RPM Lower than Expected; P0507: Idle Air Control System RPM Higher than Expected DTC P050A: Cold Start Idle Air Control System Performance; P050B: Cold Start Ignition Timing Performance DTC P0532: A/C Refrigerant Pressure Sensor "A" Circuit Low; P0533: A/C Refrigerant Pressure Sensor "A" Circuit High DTC P0560: ECM Back-Up Power Supply Malfunction DTC P0601: Internal Control Module Memory Check Sum Error; P0607: Control Module Performance; P2610: ECM / PCM Internal Engine Off Timer Performance DTC P0602: Control Module Programming Error DTC P0616: Starter Relay Circuit Low; P0617: Starter Relay Circuit High DTC P0620: Generator Control Circuit DTC P0625: Generator Field Terminal Circuit Low; P0626: Generator Field Terminal Circuit High DTC P0630: VIN Not Programmed or Incompatible-ECM DTC P0660: Intake Manifold Tuning Valve Control Circuit / Open DTC P2004: Intake Open Manifold Runner Control Stuck ; P2006: Intake Manifold Runner Control Stuck Closed DTC P2008: Intake Manifold Runner Control Circuit/Open DTC P2016: Intake Manifold Runner Position Sensor/Switch Circuit Low; P2017: Intake Manifold Runner Position Sensor/Switch Circuit High DTC P2096: Post Catalyst Fuel Trim System Too Lean; P2097: Post Catalyst Fuel Trim System Too Rich DTC P2101: Throttle motor Control Motor Circuit Range / Performance DTC P2102: Throttle motor Control Motor Circuit Low; P2103: Throttle motor Control Motor Circuit High DTC P2111: Throttle motor Control System-Stuck Open DTC P2119: Throttle motor Control Throttle Body Range / Performance DTC P2122: Throttle / Pedal Position Sensor / Switch "D" Circuit Low Input; P2123: Throttle / Pedal Position Sensor / Switch "D" Circuit High Input DTC P2127: Throttle / Pedal Position Sensor / Switch "E" Circuit Low Input; P2128: Throttle / Pedal Position Sensor / Switch "E" Circuit High Input DTC P2135: Throttle / Pedal Position Sensor / Switch "A" / "B" Voltage Correlation DTC P2138: Throttle / Pedal Position Sensor / Switch "D" / "E" Voltage Correlation DTC P2227: Barometric Pressure Circuit Performance (EVAP-Leak-Check Model) DTC P2228: Barometric Pressure Circuit Low; P2229: Barometric Pressure Circuit High (EVAP-Leak-Check Model) DTC P2227: Barometric Pressure Circuit Performance ; P2228: Barometric Pressure Circuit Low; P2229: Barometric Pressure Circuit High (Non-EVAP-Leak-Check Model) DTC P2400: Evaporative Emission System Leak Detection Pump Control Circuit / Open DTC P2404: Evaporative Emission System Leak Detection Pump Sense Circuit Range / Performance DTC P2A01: O2 Sensor Circuit Range / Performance (Bank 1, Sensor 2) DTC U0073: Control Module Communication Bus Off DTC U0101: Lost Communication with TCM DTC U0121: Lost Communication With Anti-Lock Brake System (ABS) Control Module DTC U0140: Lost Communication With Body Control Module DTC U0155: Lost Communication With Instrument Panel Cluster (IPC) Control Module Inspection of ECM and Its Circuits ECM Power and Ground Circuit Check Repair Instructions Special Tools and Equipment