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Home >> Lexus >> 2003 >> RX 300 AWD >> Repair and Diagnosis (Single Page) >> Engine Performance >> Testing & Diagnosis >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0335: Crankshaft Position (CKP) Sensor "A" Circuit & DTC P0339: Crankshaft Position Sensor Circuit Intermittent >> Diagnosis & Repair

Diagnosis & Repair

  1. Check for open and short in harness and connector between ECM and crankshaft position sensor. Repair or replace harness or connector. If harness or connector are okay, go to next step.
  2. Disconnect CKP sensor harness connector. Using ohmmeter, measure resistance between sensor connector terminals. Resistance should be 1630-2740 ohms at 14-122°F (-10-50°C) or 2065-3225 ohms at 122-212°F (50-100°C). If using oscilloscope, during cranking or idling, check the waveforms between terminals NE+ and NE- of the ECM connector. Waveform frequency is shortened as the engine speed becomes higher. See Fig 1. Replace sensor as necessary. If sensor is okay, go to next step.
  3. Remove and inspect sensor. Also, inspect signal plate. Replace as necessary. If both components are okay, replace ECM and retest system.
Fig 1: Crankshaft Position Sensor Oscilloscope Waveform
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