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Engine Controls - Tests W/Codes - 4-CYL Expand All (for easy ctrl-f) Collapse All Introduction Self-Diagnostic System Scan Tester Problems ECM Location Trouble Code Charts ECM Terminal Identification ECM Power Source Circuit Check DTC P0100 - Mass Airflow Meter Circuit DTC P0101 - Mass Airflow Meter Circuit Range/Performance Problem DTC P0110 - Intake Air Temperature Sensor Circuit DTC P0115 - Engine Coolant Temperature Sensor Circuit DTC P0116 - Engine Coolant Temperature Sensor Circuit Range/Performance Problem DTC P0120 - Throttle Position Sensor Circuit DTC P0121 - Throttle Position Sensor Circuit Range/Performance Problem DTC P0125 - Insufficient Engine Coolant Temp. For Closed Loop Fuel Control DTC P0130 - Heated Oxygen Sensor Circuit Malfunction (Bank 1, Sensor 1) DTC P0133 - Heated Oxygen Sensor Circuit Slow Response (Bank 1, Sensor 1) DTC P0135, P0141 - Heated Oxygen Sensor Heater Circuit Malfunction (Bank 1, Sensors 1 & 2) DTC P0136 - Heated Oxygen Sensor Heater Circuit Malfunction (Bank 1, Sensor 2) DTC P0171, P0172 - Air/Fuel Ratio Lean Or Rich Malfunction DTC P0201, P0202, P0203, P0204 - Injector Circuit Malfunction (Cylinders No. 1, 2, 3 & 4) DTC P0300, P0301, P0302, P0303 & P0304 - Injector Circuit DTC P0325 - Knock Sensor No. 1 Circuit Malfunction DTC P0335 - Crankshaft Position Sensor Circuit Malfunction DTC P0336 - Crankshaft Position Sensor Circuit Range/Performance DTC P0340 - Camshaft Position Sensor Circuit Malfunction DTC P0401 - Insufficient EGR Flow DTC P0402 - Excessive EGR Flow DTC P0420 - Catalyst System Efficiency Below Threshold DTC P0441 - Evaporative Emission Control System Incorrect Purge Flow DTC P0500 - Vehicle Speed Sensor Malfunction DTC P0505 - Idle Control System Malfunction DTC P0510 - Closed Throttle Position Switch Malfunction DTC P1300 - IGNITOR Circuit Malfunction DTC P1500 - Starter Signal Malfunction DTC P1600 - ECM Batt Malfunction Summary