The Crankshaft Position Sensor (CKPS) is a magnetic field sensitive type sensor that generates voltage using a sensor and a target wheel mounted on the crankshaft; there are 58 slots in the target wheel where one is longer than the others. During one crankshaft rotation there are 58 rectangular signals and one longer signal. The ECM calculates engine RPM by using the sensor’s signal and controls the injection duration and the ignition timing. Using the signal differences caused by the longer slot, the ECM identifies which cylinder is at top dead center.
Checking output signals from CKPS every 7.8 sec. under detecting condition, if an output signal is missing or redundant for more than 1.56 sec., ECM sets P0336. MIL(Malfunction Indication Lamp) turns on when the malfunction lasts till consecutive 2 driving cycle.
Item | Detecting Condition | Possible Cause |
DTC Strategy |
•
Detecting extra/missing pulses between consecutive 58X reference pulses | 1. Poor connection 2. Noise 3. Short in harness 4. Target wheel 5. ECM |
Enable Conditions |
•
Engine running state | |
Threshold value |
•
Extra / missing pulses > 2 pulses | |
Diagnosis Time |
•
Continuous (More than 1.56 sec.failure for every 7.8 sec.test) | |
MIL On Condition |
•
2 Driving Cycles |
Item | Specification |
Coil Resistance (Ω) | 630 ~ 770Ω (20℃) |
Airgap (mm) | 0.5 ~ 1.5 mm |
Fig.1) Normal waveforms of CKPS & CMPS
