Codes 441 and 335 on my hyundai elantra 2002
Hi there:DTC P0335 - Crankshaft Position Sensor A Circuit Malfunction
The crankshaft position sensor (CKP) measures crankshaft location and relays this information to the PCM (Powertrain Control Module). Depending on the vehicle, the PCM uses this crankshaft position information to time the spark properly or on some systems it is only for misfire detection and does not control spark timing. The CKP sensor is stationary and works in harmony with a reluctor ring (or toothed ring) that is attached to the crankshaft. As this reluctor ring passes in front of the CKP sensor, the magnetic field created by the CKP sensor is interrupted and this creates a square wave voltage signal that the PCM interprets as crankshaft position. If the PCM detects that there are no crankshaft pulses or if it sees a problem with the pulses on the output circuit, P0335 will set.
A P0335 "check engine light" code could be caused by:Damaged CKP sensor connectorDamaged reluctor ring (missing teeth or not turning due to sheared-off keyway)Sensor output openSensor output shorted to groundSensor output shorted to voltageFailed crank sensorBroken timing beltFailed PCM
Possible Solutions:Using a scan tool, check if, when engine is running or cranking, that there is an RPM signal.If there is no RPM reading, then visually inspect the crank sensor and connector for any damage and repair as necessary. If there is no visible damage, and you have access to a scope, you could check the CKP 5 Volt square wave pattern. If you do not, then, obtain a resistance reading of your crank sensor from a repair manual. (There are so many different types of crank sensors that there's no way to put here which resistance reading is correct). Then check the resistance of the CKP sensor by disconnecting the sensor and measuring resistance of the sensor. (It is best to check resistance readings from the PCM connector. This rules out any wiring problems from the start. But it does require some mechanical skill and shouldn't be performed if you\'re not familiar with automobile electrical systems). Is the sensor within resistance specs?If not, replace the CKP sensor. If so, recheck resistance reading from the PCM connector. Is the reading still okay?If not, repair open or short in the wiring to the crank sensor and re-check. If the reading is okay, the problem is intermittent or the PCM may be at fault. Try reconnecting and checking for RPM signal again. If there is now an RPM signal, wiggle test the wiring harness to try and induce the fault.This code is basically identical to P0385. This code P0335 refers to Crankshaft Posistion Sensor "A", whereas P0385 refers to Crankshaft Position Sensor "B". Other crank sensor codes include P0016, P0017, P0018, P0019, P0335, P0336, P0337, P0338, P0339, P0385, P0386, P0387, P0388, and P0389.
DTC P0441 - Evaporative Emission Control System Incorrect Purge FlowThis indicates that a part of the EVAP control system is no longer fuctioning correctly. The EVAP system consists of many parts, including (but not limited to) the gas cap, fuel lines, carbon canister, purge valve, and other hoses. The (EVAP) emission control system prevents the escape of fuel vapors from a vehicle's fuel system. Fuel vapors are routed by hoses to a charcoal canister for storage. Later, when the engine is running a purge control valve opens allowing intake vacuum to siphon the fuel vapors into the engine.
EVAP emission canister purge is contolled by a valve which allows engine vacuum to pull stored fuel vapors from fuel tank into the engine to be burned, rather than be vented to atmosphere. A vacuum switch is used to detect when flow exists. If the PCM commands purge and sees that the switch is closed (indicating no detected purge flow) P0441 is set.
A code P0441 could mean one or more of the following has happened:Bad vacuum switchBroken or damaged EVAP line or canisterOpen in PCM purge command circuitOpen or short in Voltage feed circuit to Purge SolenoidFaulty purge solenoidRestriction in EVAP solenoid, line or canisterCorrosion or resistance in purge connectorBad PCM
Possible Solutions:With a P0441 OBD-II trouble code, diagnosis can be tricky at times. Here are some things to try:
Common Chrysler fix - Replace Leak Detection Pump / LDPRepair damaged EVAP lines or canisterRepair open or short in voltage feed circuit to Purge SolenoidRepair open in PCM purge command circuitReplace purge SolenoidReplace vacuum switchRepair restriction in Evap line or canister or soleniodRepair resistance in purge connectorReplace PCM
Hope this helps.
on Mar 28, 2012