Z31/SENSORS/cas php

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Z31 Crank Angle Sensor

Crank Angle Sensor (CAS)

The crank angle sensor is a basic signal sensor for the entire ECCS. It monitors engine speed and piston position, sending signals to the ECCS control unit to control fuel injection, ignition timing, idle speed, fuel pump operation, and EGR operation.

The crank angle sensor contains a rotor plate and a wave form circuit. The rotor plate has 360 slits for the 1° signal (engine speed signal) and six slits for the 120° signal (crank angle signal). Built-in LEDs and photo diodes within the wave forming circuit generate signals as the slits pass between them.

When the signal plate passes through the space between the LED and photo diode, each slit alternately cuts the light. This interruption creates an alternating voltage, which is then converted to an on-off pulse by the wave forming circuit. The signal is sent to the control unit via the green wire with yellow trace, which connects to pin 8 on the ECCS.

WARNING - Do this modification at your own risk. We Are not responsable for any issues of your own doing.

Sensor Pinout

Below you will see the pinout of the Crank Angle Sensor. Click on each pin area for details.

Common Problems

• No Spark
• No Fuel From the Injectors but Fuel at the rail

Troubleshooting

The ECCS of the Z31 will flash trouble codes using two LED lamps on the ECU. A chart of these codes is available on the ECU page.

Code 11:Indicates a fault in the Crank Angle Sensor Circuit.

- Check ground at Pin 4:Disconnect the 4-pin crank angle sensor connector at the sensor. Measure resistance to ground onPin 4. It should read0 Ω. If not, you have a bad ground—repair or replace the harness.

- Check voltage at Pin 1:With the ignition ON, use a multimeter to check for battery voltage onPin 1of the connector.

- Check harness continuity:If steps 1 and 2 are good, disconnect the 20-pin connector at theECCS unitand check resistance betweenPins 8 and 17. This ensures no broken insulation or open circuit in the harness.

- Final continuity test:Add a jumper wire betweenPins 2 and 3of the Crank Angle Sensor plug. Then, test for continuity (should be 0 Ω) betweenPins 8 and 17on the 20-pin connector at the ECCS unit.

If any of these tests fail, repair the harness or replace the faulty sensor as needed.

Replacement

The video below will guide you through the steps for replacing the Crank Angle Sensor. You can even use a newer 1990s S13 240SX Crank Angle Sensor unit.

YouTube channelfor this and many other informational videos.

Interchange

Vehicles Using the Same Crank Angle Sensor (CAS) as the Z31

Make	Model	Years
INFINITI	G20	(1991 - 1994)
INFINITI	M30	(1990 - 1992)
ISUZU	TROOPER	(1988 - 1991)
MERCURY	VILLAGER	(1993 - 1998)
NISSAN	200SX	(1984 - 1987)
NISSAN	240SX	(1989 - 1990)
NISSAN	280ZX	(1981 - 1983)
NISSAN	300ZX	(1984 - 1989)
NISSAN	720 PICKUP	1986
NISSAN	AXXESS	(1990 - 1995)
NISSAN	D21 PICKUP	(1986 - 1994)
NISSAN	MAXIMA	(1985 - 1994)
NISSAN	MULTI	(1986 - 1988)
NISSAN	NX	(1992 - 1993)
NISSAN	PATHFINDER	(1987 - 1995)
NISSAN	PICKUP	1995
NISSAN	PULSAR NX	(1983 - 1986)
NISSAN	QUEST	(1993 - 1998)
NISSAN	SENTRA	(1984 - 1994)
NISSAN	STANZA	(1986 - 1992)
NISSAN	VAN	(1987 - 1988)
SUBARU	DL	(1987 - 1989)
SUBARU	GL	(1987 - 1989)
SUBARU	GL-10	(1987 - 1989)
SUBARU	LOYALE	(1990 - 1994)
SUBARU	RX	(1987 - 1989)
SUBARU	STANDARD	1987
SUBARU	XT	(1987 - 1991)

Sources Used

• 1984-1988 Nissan 300ZX Factory Service Manual