DTC P0335: Crankshaft Position Sensor "A" Circuit; DTC P0339: Crankshaft Position Sensor "A" Circuit Intermittent: Description
The crankshaft position sensor system consists of a No. 1 crankshaft position sensor plate and a pickup coil.
The sensor plate has 34 teeth and is installed on the crankshaft. The pickup coil is made of wound copper wire, an iron core and magnet. The sensor plate rotates and, as each tooth passes by the pickup coil, a pulse signal is created. The pickup coil generates 34 signals per engine revolution. Based on these signals, the ECM calculates the crankshaft position and engine speed. Using these calculations, the fuel injection time and ignition timing are controlled.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| P0335 | When one of following conditions is met: (1 trip detection logic)
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| P0339 | Following conditions (a), (b) and (c) are met: (1 trip detection logic) (a) Engine speed 1000 rpm or more (b) No crankshaft position sensor signal for 0.05 seconds or more (c) 3 seconds or more have elapsed since starter signal switched from ON to OFF |
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- Reference: Inspection using an oscilloscope.
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
HINT:
- The correct waveform is as shown.
- NE+ is the crankshaft position sensor signal.
- A failure of the ground for the shielding of the wiring may result in noisy waveforms.
ECM Terminal Name Between NE+ and NE- Tester Range 5 V/DIV, 20 ms/DIV Condition Idling