Crankshaft Position Sensor
2021 Honda Civic · 1.5L I4 Turbo
Sensor Type
hall-effect
Waveform Type
dc-square
Location
Mounted on the engine block below the intake manifold, near the crankshaft pulley at approximately 2 o'clock position when viewing from the front of the engine
Pins
3-pin connector
Idle Frequency
33 Hz
Timebase
20ms/div
Voltage Scale
2V/div
Trigger
2.5V, rising edge
Wiring
Orange wire (signal), Green/White wire (ground), Black/Yellow wire (5V reference)
Expected Voltage Range
At Idle
0.2V to 4.8V
At Higher RPM
0.2V to 4.8V
Expected Pattern
12 evenly spaced pulses per crankshaft revolution with no missing teeth, clean square wave transitions
Known-Good Waveform
Clean digital square wave transitioning sharply between approximately 0.3V and 4.7V with 12 consistent pulses per crank revolution at idle (approximately 700 RPM). The pulse width should be uniform with no distortion, ringing, or voltage spikes on transitions. At idle, expect approximately 33 Hz frequency with 50% duty cycle.
Common Failure Patterns
Intermittent loss of signal or erratic pulse widths, voltage not reaching full 5V or dropping below 0.5V
Cause: Sensor internal failure due to heat exposure from turbocharger proximity or contamination from oil leaks
Diagnostic Tips
On L15B7 turbocharged engines, the CKP sensor is prone to heat soak from the turbo causing intermittent no-start conditions when engine is hot. Always verify proper 5V reference and ground before replacing sensor, and check for oil contamination at connector.
Related Diagnostic Trouble Codes
P0335P0336P0337P0338P0339
Always confirm waveform data with your vehicle's OEM service manual before diagnosing.
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