Inductive crankshaft position sensor - running

The purpose of this test is to evaluate the operation of an inductive crankshaft position sensor, which has a ground reference and with the engine running.

Connection guidance

Connection for diagnostic work will vary dependent on application.

Technicians should whenever possible gain access to the test circuit without damage to seals and insulation. If this is not possible then make sure appropriate repairs are completed.

General connection advice

PicoScope offers a range of options within the test kits.

Dependent on difficulty of access, choose from:

  1. Breakout leads.
  2. Back-pinning probes.

Testing Sensors and Actuators (to include relevant circuit/connectors):

  • When testing a sensor, it is desirable to gain access at the control unit.
  • When testing an actuator, it is desirable to gain access at the actuator.

How to perform the test

  1. Connect PicoScope channel A to the vehicle.
  2. Minimise the help page and with the example waveform on your screen PicoScope has already selected suitable scales for you to capture a waveform.
  3. Select GO or press the space bar to see live data.
  4. Start and run the engine to capture your waveform.
  5. With your live waveform on screen select STOP or press the space bar to stop your capture.
  6. Turn off the engine.
  7. Use the WAVEFORM BUFFER and ZOOM tools to examine your waveform.

Example waveform

Waveform notes

A known good waveform, the amplitude and frequency showing correct voltage levels and changes as the engine speed changes.

Clear indication of the ‘missing tooth’ signal.

No spikes or inconsistent pattern breaks.

Waveform Library

The Waveform Library has 559 examples of inductive crankshaft sensor.

Go to the drop-down menu bar at the lower left corner of the Waveform Library window and select ‘crankshaft sensor inductive’.

Further guidance

Mechanical Checks.

If the waveform indicates a fault, make a physical inspection of the CPS. The list below highlights some key areas for inspection.

  • CPS fitment to housing / mounting. The sensor must sit correctly and securely.
  • Inspect CPS tip for damage / foreign object.
  • Inspect pick-up ring for damage / foreign object.
  • Inspect air gap between CPS and pick-up ring.
  • Inspect run-out of pick-up ring.
  • Inspect end float at the pick-up ring.
  • Inspect CPS for water / coolant ingress and corrosion.
  • Inspect CPS and ECM connector pin number alignment as per vehicle specification.
  • Inspect CPS location for sources of interference (high current consumers E.g. starter motor, ignition coils and injectors).

Generic DTC’s Crankshaft Position Sensor.

P0016 - Crankshaft Position Camshaft Position Correlation Bank 1 Sensor A

P0315 - Crankshaft position (CKP) system variation values are not stored in the PCM memory

P0335 - CKP Sensor A Circuit Performance

P0336 - Crankshaft Position (CKP) Sensor A Performance

P0337 - Crankshaft Position (CKP) Sensor Circuit Low Duty Cycle

P0338 - Crankshaft Position (CKP) Sensor Circuit High Duty Cycle

P0339 - Crankshaft Position (CKP) Sensor Circuit Intermittent

P0385 - Crankshaft Position (CKP) Sensor B Circuit

P0386 - Crankshaft Position (CKP) Sensor B Performance

P0387 - Crankshaft Position Sensor B Circuit Low Input

P0388 - Crankshaft Position Sensor B Circuit High Input

P0389 - Crankshaft Position Sensor B Circuit Intermittent

P1324 - Crank RPM Too Low

P1335 - CKP Circuit

P1336 - Crankshaft Position (CKP) System Variation Not Learned

P1345 - Crankshaft Position (CKP)-Camshaft Position (CMP) Correlation

P1372 - Crankshaft Position (CKP) Sensor A-B Correlation

GT430-3

Disclaimer
This help topic is subject to changes without notification. The information within is carefully checked and considered to be correct. This information is an example of our investigations and findings and is not a definitive procedure. Pico Technology accepts no responsibility for inaccuracies. Each vehicle may be different and require unique test settings.

Suitable accessories

  • Premium 6-way breakout lead set

    £269.00

  • Back-pinning Probe Set

    £48.00

  • Flexible Back-pinning Probe

    £4.25

  • Large Dolphin/Gator Clips

    £10.00

  • Premium Test Lead: BNC to 4 mm, 3 m

    £47.00

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Guided test: Inductive - running