SR20 Trigger Information
Sensor Information
Crank/Cam Sensor (CAS)
There are a couple of different types of triggering systems found on SR20 engines. There are the Distributor models most found on NA car, and there are the CAS type units found on Direct Fire equipped engines predominantly turbocharged.
There is also a different way the patterns can be described. Nissan often calls the 360x signal a "1 degree" and the 4x signal a "180-degree". Interestingly the 1 degree signal has 360 slots for 720 crank degrees.
S13, S14, S15 CAS
| Pin | Description | Haltech Connection |
| 1 | Signal Ground | Signal Ground (Blue in Trigger 4-core) |
| 2 | 12V+ Switched | 12V+ (Red in Trigger 4-core) |
| 3 | 360x (Home+) | Home+ (Yellow in Home 4-core) |
| 4 | 4x (Trigger+) | Trigger+ (Yellow in Trigger 4-core) |
Trigger/Home Wiring Hack
For applications where there is a dual Hall Effect pickup in a CAS or Distributor there is a quick wiring hack that allows the Home+ signal to be incorporated in the Trigger 4-core shielded cable. This can make the wiring much cleaner and easier.
To do this we will be relocated the wiring at the ECU Connector so that the unusued Trigger- wire is instead placed onto the ECU pin for Home+. This means that the Trigger 4-core cable now has 12V+, Ground, Trigger+ and Home+ all in the one cable. The GREEN wire that is labelled at Trigger- is now actually the Home+.
For Elite 550/750/950 models
1. Unplug the Main Connector at the ECU end.
2. Unlock the connector by pushing in the large white tab on the connector until it clicks. This will cause the two smaller white tabs to pop up on the other side.
3. Remove the Yellow Home+ wire from pin 32. Insulate this wire, it will not be used.
4. Remove the Green Trigger- wire from pin 33 and move it to pin 32. Push it all the way until you can see the metal pin clearly from the pin side of the connector and it looks the same as all other pins.
5. Lock the connector by pushing back down the 2x white tabs until they click into position.
For Elite 1000/1500/2000/2500 models
1. Unplug the smaller 26-pin Main Connector at the ECU end.
2. Unlock the connector by pushing in the large white tab on the connector until it clicks. This will cause the two smaller white tabs to pop up on the other side.
3. Remove the Yellow Home+ wire from pin 2.
4. Remove the Green Trigger- wire that is in pin 5 and move it to pin2. Push it all the way until you can see the metal pin clearly from the pin side of the connector and it looks the same as all other pins.
5. Lock the 26-pin connector by pushing back down the 2x white tabs until they click into position.
1. Unplug the smaller 26-pin Main Connector at the ECU end.
2. Unlock the connector by pushing in the large white tab on the connector until it clicks. This will cause the two smaller white tabs to pop up on the other side.
Trigger Configuration - Direct Fire Models
Distributor
There is more than one type of distributor. Some have an internal ignition coil, others have an external coil.
Internal coil type wiring
| Pin | Description | Haltech Connection |
| 1 | ECU Ignition Output #1 | Ignition Output 1 |
| 2 | Power Ground (To Head) | --- |
| 3 | 360x | Home+ (Yellow in Home 4-core) |
4 | 4x | Trigger+ (Yellow in Trigger 4-core) |
5 | 12V+ | 12V+ (Red in Trigger 4-core) |
6 | Signal Ground | Signal Ground (Blue in Trigger 4-core) |
| Pin | Description | Haltech Connection |
| 7 | 12V+ Switched Coil + | --- |
| 8 | No Connection | --- |
Trigger/Home Wiring Hack
For applications where there is a dual Hall Effect pickup in a CAS or Distributor there is a quick wiring hack that allows the Home+ signal to be incorporated in the Trigger 4-core shielded cable. This can make the wiring much cleaner and easier.
To do this we will be relocated the wiring at the ECU Connector so that the unused Trigger- wire is instead placed onto the ECU pin for Home+. This means that the Trigger 4-core cable now has 12V+, Ground, Trigger+ and Home+ all in the one cable. The GREEN wire that is labelled at Trigger- is now actually the Home+.
For Elite 550/750/950 models
1. Unplug the Main Connector at the ECU end.
2. Unlock the connector by pushing in the large white tab on the connector until it clicks. This will cause the two smaller white tabs to pop up on the other side.
3. Remove the Yellow Home+ wire from pin 32. Insulate this wire, it will not be used.
4. Remove the Green Trigger- wire from pin 33 and move it to pin 32. Push it all the way until you can see the metal pin clearly from the pin side of the connector and it looks the same as all other pins.
5. Lock the connector by pushing back down the 2x white tabs until they click into position.
For Elite 1000/1500/2000/2500 models
1. Unplug the smaller 26-pin Main Connector at the ECU end.
2. Unlock the connector by pushing in the large white tab on the connector until it clicks. This will cause the two smaller white tabs to pop up on the other side.
3. Remove the Yellow Home+ wire from pin 2.
4. Remove the Green Trigger- wire that is in pin 5 and move it to pin 2. Push it all the way until you can see the metal pin clearly from the pin side of the connector and it looks the same as all other pins.
5. Lock the 26-pin connector by pushing back down the 2x white tabs until they click into position.
Trigger Configuration - Distributor Models
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