L84sky

The 2001 Tracker had three engine options: G16, J20 and the H25

The Crankshaft Position (CKP) sensor for the 1600 cc 4-cylinder G16 looks like this.




The CKP sensor detects the six tabs on the timing belt crank pulley/reluctor ring.


The G16 reluctor ring is located at the front of the crankshaft.


This is the waveform (above) the PCM receives from the CKP sensor at a 750 RPM idle.


This is the CKP sensor for the 2000 cc 4-cylinder J20 engine.



The J20 reluctor ring is pressed onto the rear of the crankshaft but it still has six tabs just like the G16.


The J20 CKP sensor reaches in from the rear of the engine.


The waveform from the J20 CKP sensor is the same as the G16 waveform.



The 2500 cc 6-cylinder H25 engine uses the same CKP sensor as the J20 engine.



But the H25 CKP sensor detects 24 tabs on the timing chain sprocket/reluctor ring.


The H25 reluctor ring is found at the front of the crankshaft.


The H25 CKP sensor waveform is not depicted in the 2001 factory service manual (Chevy or Suzuki). This image was captured by backprobing my H25 PCM connectors with an oscilloscope. None of the Tracker CKP sensors actually determine crankshaft position. They only determine the speed of the crankshaft. The PCM can detect small variations in crankshaft rotation caused by engine misfires. Correlating the variations with the Camshaft Position (CMP) sensor waveform, the PCM can determine which piston is misfiring. In theory the PCM could determine crankshaft speed variations at the CMP sensor but in practice the slack and slap of the timing chains would swamp the tiny variations at the crank. That's why the CKP sensor is used to measure crankshaft speed directly at the crank. The Tracker engines will run normally with the CKP sensors disconnected. It will set a code but will not affect engine performance.