Nissan Optical CAS

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The famous E15ET turbo distributor used an optical crank angle sensor. It was used as a trigger for ECU-based electronic spark control

Overview

D4P

See D4P

Under the cover plate is a trigger wheel for the ECU.
D4P

Photo: Mitsubishi T4T84471 6626, Nissan 22100-27M15 from USA 1987 KPB12

The crank angle sensor is a thin aluminum disc, which is actually perforated 360 times. In this photo you can make out the screw under the disc, seen through the perforations.
D4P

retouched photo (marked to show degrees)

Note the second (inner) row of perforations. These are the Cam position marks.

CAS

A.k.a. Crankshaft Position Sensor (CPS).

MITSUBISHI Crank Angle Sensor J912 (NISSAN 22100-53J11)

STANDARD MOTOR PRODUCTS  # LX653
Rock auto
Fits:
1987-1994 Subaru DL/GL/Loyal
1987-1989 Subaru XT
1993-1998 Mercury Villager 3.0
1991-1994 Infiniti G20 SR20DE
1988-1990 Isuzu Trooper 2.6/2.8
1984-1986 Nissan S12 200SX CA18ET
1989-1990 Nissan S13 240SX KA24E
1981-1983 Nissan S130 280ZX Turbo
1984-1989 Nissan Z31 300ZX VG30/VG30T
1986 Nissan 720 Z24I
1990 Nissan Axxess KA24E
1986-1994 Nissan D21 Z24I, VG30, KA24
1985-1994 Nissan Maxima VG30E
1992-1993 Nissan NX GA16DE, SR20DE
and many more Nissan

S13

J563 S13 KA24
Ignition Optic Sensor Kit
BECK/ARNLEY 1800233
STANDARD MOTOR PRODUCTS LX653

J917 CA18DE

Mitsubishi Engines

4G63 sensor J918 - 1990-1994 Mitsubishi & 1992-1995 Hyundai Elantra

1.8, 2.0 & 2.4 DOHC Sirius 4G6 engines

6G72 sensor 928 - notice the wheel has a different pattern from the 4-cylinder.

CPS 'T1T49371 R' from Mitsubishi 3000 GT

Constant-pattern trigger wheels - similar to the Nissan wheel - are available from the aftermarket.

Information on using with MegaSquirt ECU. http://forums.turbobricks.com/showthread.php?t=224740

Red +12v
Black  Ground
White Cam signal
Yellow Crank signal

Using With A-series

D4P can be used as a trigger for ECU-based electronic spark control and for fuel injection.

See D4P

Control Box

Nissan

A stock Nissan ECU can be used with an A-series engine. Use it with all the stock Fuel Injection parts from the donor Nissan. For spark-only control, leave the injector harness unplugged. Custom spark maps cab be programmed.

MegaSquirt

Nissan optical CAS/CPS unit can be used to trigger MegaSquirt ECU for electronic spark control of coil packs. MegaSquirt II with the latest firmware download can use the stock Nissan trigger wheels, while other brands of ECU generally require a swap to a special low resolution trigger wheel.

It may also be used for sequential fuel injection.

Haltech

Haltech supports Nissan Optical CAS.