Distributorless ignition systems require (CKP)-(CMP) – Crankshaft-Camshaft Position Sensors.

These (CKP)-(CMP) Sensors serve essentially the same purpose as the ignition pickup and trigger wheel in an electronic distributor.

The big difference being that the basic timing signal is read off the crankshaft instead of the distributor shaft.

Consequently, This eliminates ignition timing variations that can result from wear and backlash in the timing chain and distributor gear.

As a result, This also eliminates any need for timing adjustments.

Crankshaft-Camshaft Position Sensors
Crankshaft-Camshaft Position Sensors

What does a Camshaft/Crankshaft Position Sensor do?

  • So, The Camshaft sensor determines which cylinder is firing. Also, Crankshaft sensors set ignition timing, supply the RPM signal, and determine engine speed.

Where are these sensors located?

  • The Camshaft Position sensor is typically located in the cylinder head. While, The Crankshaft Position sensor is normally located in the timing cover or on the side of the block.

Will a malfunctioning Cam or Crank Sensor illuminate the check engine light or affect vehicle operation?

  • Yes, a failing sensor can illuminate the MIL, and may cause vehicle stalling or a no-start condition.

What are the common causes of failure?

  • Typically these sensors fail due to exposure to high heat.

How to determine if these sensors are malfunctioning?

  • Look for RPM on a scan tool while cranking the engine. Furthermore, If the engine runs, a scope is the best diagnostic tool. Typical trouble codes: Crankshaft P0335; Camshaft P0340.

(CMP) – Camshaft Position Sensors

So, The camshaft sensor monitors the frequency at which the camshaft is turning.

(CKP) – Crankshaft Position Sensors

While, The crankshaft sensor keeps track of the rate at which the crankshaft is rotating.

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(CKP)-(CMP) – Crankshaft-Camshaft Position Sensors Engine Codes