SR20 Engine
The Nissan SR20DET, DE, and VE engines
SR20DET Turbo
SR20DE Aspirated
SR20VE
Haltech ECU Options
| ECU Model | Plug In Available | OEM Functions Not Supported | Suitable Installation Type | Support Sequential and/or Direct Fire Ignition |
Platinum Pro S15 | S13X,S14s2,S15AUDM,S15JDM S13 with wiring modifications | - | Standalone | Yes |
| Elite 550 | No | Yes | ||
| Elite 750 | No | Yes | ||
| Elite 950 | No | Yes | ||
| Elite 1000 | Yes | - | Standalone | Yes |
| Elite 1500 / Nexus S2 | Yes | - | Standalone | Yes |
| Elite 2000 | Yes | - | Standalone | Yes |
| Elite 2500 / Nexus S3 | Yes | - | Standalone | Yes |
Recommended ECU Models
Platinum Pro S15: For those looking for a budget ECU that runs all factory functionality but does not require the latest ECU features.
Elite 550: For a basic installation to just run the injectors, ignition, and maybe a couple of outputs. More used for a cheap engine conversion.
Elite 750/950: As above however Long Term Learning of Fuel, Datalogging to internal memory, or flex fuel are required features.
Elite 1000: When a plug in adapter kit is used or when all of the vehicle needs to be supported.
Elite 1500 / Nexus S2: As above with added advanced functionality
Elite 2500 / Nexus S3: As above but looking for more injector outputs or just more outputs in general.
General Information
| Cylinders | 4 |
| Displacement | 1998cc |
| Firing Order | 1,3,4,2 |
| Cylinder Orientation | Cyl1 front, Cyl4 rear |
Model Variants
There are various models of the SR20 engine.
SR20DE refers to naturally aspirated variants. These all have distributor ignition and come with either red or unpainted rocker covers.
SR20DET refers to turbocharged variants. These come in common variants listed below.
SR20VE / SR16VE refers to engines with the Variable Valve Lift technology, commonly known as VVL or NEO VVL.
Common Turbo Models
SR20DET Variant | Identifiers |
S13 Silvia/180SX | Red flat rocker cover. Direct Fire ignition. |
U13 Bluebird | Red flat rocker cover. Distributor ignition. Small intercooler attached to engine over intake manifold. |
| N14 Pulsar GTIR | Red flat rocker cover. Distributor ignition. Larger intercooler covering intake manifold and rocker cover. ITB intake. |
S14 200SX | Variable cam with humped rocker cover. External igniter module. |
S15 200SX | Variable cam with humped rocker cover. Smaller ignition coils with internal igniters. |
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 and Home Wiring Hack
A common hack to make wiring simpler is to do the following:
In the Grey shielded Trigger 4-core cable we have 12V+, Signal Ground, Trigger+, and Trigger-. We need all of these wires except for Trigger-
In the Grey/Black shielded Home 4-core cable we only need the Home+
If we relocate the Green Trigger- wire so that instead of going to this ECU pin it instead goes to the Home+ ECU pin we now have all of the wires we require in a single 4-core cable.
For Elite 550 / 750 / 950
1. Remove the Yellow wire from ECU pin A32 and insulate it. It will not be used.
2. Remove the Green wire from ECU pin A33 and move it to A32.
For Elite 1000 / 1500 / 2000 / 2500
1. Remove the Yellow wire from ECU pin B2 and insulate it. It will not be used.
2. Remove the Green wire from ECU pin B5 and move it to B2.
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 |
| 1 | ECU Ignition Output #1 |
| 2 | Power Ground (To Head) |
| 3 | 360x (Home+) |
4 | 4x (Trigger+) |
5 | 12V+ Switched Sensors |
6 | Signal Ground |
| Pin | Description |
| 7 | 12V+ Switched Coil + |
| 8 | No Connection |
Trigger Configuration - Distributor Models
Ignition Coils
There are also a number of different ignition coil types that were used on SR20 engines.
S15 with internal igniter
| Pin | Description |
| IB | ECU Ignition Output |
| G | Ground (to head) |
| + | 12V+ Switched |
S13 and S14 with external igniter
| Pin | Description |
| - | Igniter Module Trigger |
| + | 12V+ Switched |
| E | Ground (to head) |
S13 and S14 Igniter Module Wiring
| Pin | Description |
| i1 | ECU Ignition Output #1 |
| i2 | ECU Ignition Output #2 |
| G | Ground to Cylinder Head |
i3 | ECU Ignition Output #3 |
i4 | ECU Ignition Output #4 |
e1 | Coil #1 -ve |
e2 | Coil #2 -ve |
e3 | Coil #3 -ve |
e4 | Coil #4 -ve |
Dwell
Suggested dwell time for Nissan Coils
Throttle Position Sensor
There are two common types of Throttle Position Sensors found on these engines. The 3-pin type and the 6-pin type.
3-pin type
| Pin | Description |
| 1 | Signal Ground |
| 2 | Signal |
| 3 | 5V+ |
6-pin type
Use the brown connector for direct wiring to ECU
Grey
| Pin | Description |
| 1 | 5V+ |
| 2 | Signal |
| 3 | Signal Ground |
Brown
| Pin | Description |
| 1 | Signal Ground |
| 2 | Signal |
| 3 | 5V+ |
MAP Sensor
These engines do not come with a MAP sensor. Some vehicles have a pressure sensor for a gauge however this is not wired to the ECU and cannot be used.
Use the internal MAP sensor that comes with your ECU. For higher boost levels an external MAP sensor should be used instead.
Idle Valve
SR20 engines come with a 2x separate 2-pin BAC idle valves. These only require a 12V+ power source that is switched with ignition power, and any spare ECU output.
Only the larger solenoid is connected to the ECU, and this is a duty pulsed type solenoid where more duty opens the valve to give a higher idle speed.
The smaller solenoid is a switched type that is used anytime the A/C clutch is engaged. This is not wired or controlled by the ECU.
Solenoids are not polarity dependent
| Pin | Haltech Connection |
| A | 12V+ Switched |
| B | Any spare ECU output |
See base maps for configuration information
Coolant Temperature Sensor
Wiring is not polarity sensitive
Calibration: Use "Temperature - Nissan S15 Coolant.cal"
Created for Haltech ECUs using a 1k pullup to 5V
Air Temperature Sensor
Most SR20 engines do not come with an ATS. Only the GTIR engine has this sensor from the factory. A sensor needs to be installed when you are using a Haltech ECU
Haltech 1/8" NPT Air Temp Sensor
Wiring is not polarity sensitive.
Calibration: Use "Temperature - GM Air Sensor.cal"
Created for Haltech ECUs using a 1k pullup to 5V
Knock Sensor
OEM Knock sensors are polarity dependent. They also internally link the ground to the engine block which is bad for signal ground integrity and it is recommended to exchange the sensor for a Haltech unit. In the Nissan wiring there is no connection to pin 1.
| Pin | Haltech Connection |
| 1 | No Connection |
| 2 | Signal |
MAF Sensor
Although most users of Haltech ECUs will be deleting the MAF, it is possible to use a MAF if you prefer.
S15 MAF
Pin letters are written on the sensor
| Pin | Description |
| A | No Connection |
| B | 12V+ Switched |
| C | Sensor Ground |
D | Signal 0-5V |
VVL Solenoids (SR16VE / SR20VE)
Nissan Ecology Oriented Variable Valve Lift and Timing (NEO VVL & VVT) is a variable valve timing technology designed by Nissan. VVL adjusts the valve lift and duration by using hydraulic pressure to switch between two sets of camshaft lobes, while VVT changes the valve timing across the RPM range. These technologies work together in a manner similar to Honda's VTEC system. However, unlike VTEC, NEO VVL can independently activate the intake and exhaust cam changes for a smoother and more consistent power output. These solenoids are controlled using Digital Pulsed Outputs (DPOs), with an RPM sense using the Cam Control Switched function in the ECU. In the SR20VE engine, the intake camshaft activates at 5,000 rpm, and the exhaust at 6,500 rpm. In contrast, the newer '20V' version engages both camshafts simultaneously at the same RPM.
OEM ECU Information
Models
S13
S15
Base Maps
Base maps have been created for use with the Haltech Elite Adapter Harnesses and these are included in the ESP Software package. Platinum Pro base maps also come with the ECU Manager Software package.
To use these maps they should be IMPORTED into your ECU. Follow the IMPORTING A BASE MAP guide.
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