Crankshaft and camshaft position sensor comparison

The purpose of this test is to obtain crankshaft and camshaft position sensor waveforms on the same time-base.  

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. Use manufacturer data to identify the signal circuits for the crankshaft and camshaft sensors.
  2. Connect PicoScope Channel A to the crankshaft sensor signal circuit.
  3. Connect PicoScope Channel B to the camshaft sensor signal circuit.
  4. Minimise the help page and with the example waveform on your screen PicoScope has already selected suitable scales for you to capture a waveform.
  5. Start the scope to see live data.
  6. Start the engine and allow it to idle.
  7. With your live waveforms on screen stop the scope.
  8. Turn off the engine.
  9. Use the Waveform Buffer, Zoom and Measuring tools to examine your waveform.

Note; Comparison of your test engine waveforms against known good waveforms for the same engine will reveal any timing discrepancies.   

Example waveform

Waveform notes

In this waveform we can observe the output voltage from the AC-excited Crank Angle Sensor (shown in blue) at the same time as monitoring the inductive Camshaft Position Sensor trace (shown in red). The main reason for evaluating these two waveforms together is to look for any unwanted offset in timing between the two sensors, which could indicate a slipped timing belt or a stretched timing chain.

Waveform Library

Go to the drop-down menu bar at the lower left corner of the Waveform Library window and select, Crankshaft sensor.

Example hall effect sensor

Example inductive sensor

Further guidance

Diagnostic trouble codes

Selection of component related Diagnostic Trouble Codes (DTCs)

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

P0340 : Camshaft Position Sensor A - Circuit Malfunction (Bank 1)

P0341 : Camshaft Position Sensor A - Circuit Range/Performance (Bank 1)

P0342 : Camshaft Position Sensor A - Circuit Low Input (Bank 1)

P0343 : Camshaft Position Sensor A - Circuit High Input (Bank 1)

P0344 : Camshaft Position Sensor A - Circuit Intermittent (Bank 1)

P0345 : Camshaft Position Sensor A - Circuit Malfunction (Bank 2)

P0346 : Camshaft Position Sensor A - Circuit Range/Performance (Bank 2)

P0347 : Camshaft Position Sensor A - Circuit Low Input (Bank 2)

P0348 : Camshaft Position Sensor A - Circuit High Input (Bank 2)

P0349 : Camshaft Position Sensor A - Circuit Intermittent (Bank 2)

P0365 : Camshaft Position Sensor B - Circuit Malfunction (Bank 1)

P0366 : Camshaft Position Sensor B - Circuit Range/Performance (Bank 1)

P0367 : Camshaft Position Sensor B - Circuit Low Input (Bank 1)

P0368 : Camshaft Position Sensor B - Circuit High Input (Bank 1)

P0369 : Camshaft Position Sensor B - Circuit Intermittent (Bank 1)

P0390 : Camshaft Position Sensor B - Circuit Malfunction (Bank 2)

P0391 : Camshaft Position Sensor B - Circuit Range/Performance (Bank 2)

P0392 : Camshaft Position Sensor B - Circuit Low Input (Bank 2)

P0393 : Camshaft Position Sensor B - Circuit High Input (Bank 2)

P0394 : Camshaft Position Sensor B - Circuit Intermittent (Bank 2)

GT151-4

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

    £40.00

  • Flexible Back-pinning Probe

    £3.00

  • PicoScope Battery Clip

    £2.75

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Guided test: Crankshaft and camshaft position sensor comparison