P0171

P0171 FUEL SYSTEM 1/1 LEAN For a complete wiring diagramRefer to Section 8W. Theory of OperationThe fuel feedback system will maintain a stoichiometric fuel/air mixture, 14.7:1, by modifying the injector pulse width according to the oxygen content of the exhaust gas. The PCM makes short term and long term fuel corrections to maintain stoichiometric fuel/air…

P0442

P0442 Evaporative Emission System Leak Detected (Small Leak) The Evaporative System (EVAP) prevents the fuel vapors from the fuel tank from escaping into the atmosphere. The EVAP system draws the fuel vapors from the fuel tank and temporarily stores them in the charcoal canister. When the engine is running and other conditions allow, the fuel…

P0449

P0449 Evaporative Emission Control System Vent Valve/Solenoid Circuit Malfunction The Evaporative System (EVAP) prevents the fuel vapors from the fuel tank from escaping into the atmosphere. The EVAP system traps the fuel vapors and temporarily stores them in the charcoal canister. When the engine is running and other conditions allow, the fuel vapors are drawn…

P0505

P0505 Idle Control System Malfunction The code P0505 – Idle Control System Malfunction means that the engine computer cannot regulate the idle speed properly, or the actual idle speed varies from the target idle speed by a certain amount. The accompanied symptoms may include difficulty starting, hesitation, stalling at idle, fluctuating idle speed, as well…

U0121

U0121 LOST COMMUNICATION WITH ANTI-LOCK BRAKE MODULE For a complete wiring diagramRefer to Section 8WWhen Monitored:Continuously while the system is active.Set Condition:The ECM doesn’t receive a Bus Message from the Anti-lock Brake Module. Possible CausesINTERMITTENT DTCCAN BUS OPEN OR SHORTED CONDITIONANTI-LOCK BRAKE MODULEENGINE CONTROL MODULE (ECM) Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding.(Refer to…