Vauxhall Workshop Service and Repair Manuals

Signal Allocation from Crankshaft Pulse Pick-up and Camshaft Sensor, X 18 XE1 and X 20 XEV  

The pulse pick-up disc (increment disc) is a gear wheel with a total of 58 teeth. The gap in the teeth is the same width as two teeth. The signal from the first tooth profile that occurs (1) on the pulse pick-up disc after the tooth gap is 114 ° CA ¹⁾ before TDC ²⁾ for the 1st/4th cylinder (2).  

The signal pattern generated by the camshaft pulley with the segments offset by 180 ° means that TDC for the 1st cylinder occurs 78 ° CA after the rising profile (4) and TDC for the 4th cylinder occurs 78 ° CA after the falling profile (3).  

Ignition sequence: 1-3-4-2
I	Signal from crankshaft pulse pick-up
II	Signal from camshaft sensor

1)  CA: Crankshaft angle  

2)  TDC: Top Dead Centre