BP-ZE Engine 94-97 "NA8"
Information on the Mazda BP-ZE Engine as found in the NA8 MX5 Miata
General Information
| Cylinders | 4 |
| Displacement | 1839 cc / 112.2 ci |
| Firing Order | 1,3,4,2 |
Common Models
Found in the MX5 Miata NA8 (Series 3)
Sensor Information
Crank/Cam Sensor
This engines uses a Crank Position Sensor and a Cam Position Sensor incorporated in a single unit mounted on the back of the head and driven by the inlet camshaft. The crank trigger has a 4x tooth pattern, and the cam trigger has a 2x tooth pattern with each being a different size.
Dual Pickup Wiring
| Pin | Description | Haltech Connection |
| A | Ground | Blue (Trigger 4-core) |
| B | 12V+ Switched | Red (Trigger 4-core) |
| C | 4x (Trigger+) | Yellow (Trigger 4-core) |
| D | 2x (Home+) | Yellow (Home 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.
Ignition Coils and Igniter
The B6 engine comes with a pair of dual-post ignition coils wired in Waste Spark, with an external igniter module.
The igniter module pinout information is written directly on the igniter
| Igniter Pin | Function | Haltech Connection |
| OC1 | Coil 1 -ve | No Connection (To Coil 1 Negative Terminal) |
| IB1 | ECU Signal 1 | Ignition Output 1 (Yellow/Black) |
| VB | 12V+ | No Connection (To ignition Switch 12V+) |
| TAC | Tacho Signal | No Connection (To Tacho) |
| IGf | Ignition Fail | No Connection |
| GND | Ground | No Connection (To Cylinder Head) |
| IB2 | ECU Signal 2 | Ignition Output 2 (Yellow/Red) |
| OC2 | Coil 2 -ve | No Connection (To Coil 2 Negative Terminal) |
Dwell Time
Throttle Position Sensor
This engine uses a cable operated throttle body with a position sensor. Auto has 4-pin TPS, Manual has 3-pin.
The 3-pin type are only a Switch and cannot read throttle position, only if the throttle is closed or not. This is not supported on Haltech ECUs and the 3-pin sensor cannot be used. It should be swapped for a 4-pin sensor type.
| TPS Pin | Function | Haltech Wiring |
| 1 - VCC | 5V+ | 5V+ - Orange |
| 2 - VTA | Signal | Signal - Spare AVI |
| 3 - IDL | Idle Switch | No Connection |
| 4 - E2 | Signal Ground | Signal Ground - Black/White |
MAP Sensor
These engines do not come with a MAP sensor.
Use the internal MAP sensor that comes with your ECU. For higher boost levels an external MAP sensor should be used instead, connected to a spare AVI.
Idle Valve
This engine uses a 2-pin BAC (Bypass Air Control) Valve which is duty controlled by the ECU via 1x output.
2-pin BAC Wiring
| Pin | Function | Haltech Connection |
| 1 | Open Signal | Spare Output |
| 2 | Power | 12V+ Switched |
Coolant Temperature
Wiring is not polarity sensitive
| Pin | Haltech Connection |
| 1 | Any Spare AVI* |
| 2 | Signal Ground |
An AVI with a selectable Pullup should be used. If not and external 1k pullup to 5V should be connected.
Air Temp
An Air Temperature Sensor is located as part of the MAF Sensor unit. When this is removed a replacement Air Temperature Sensor should be installed.
Wiring is not polarity sensitive.
| Pin | Haltech Connection |
| 1 | Any Spare AVI* |
| 2 | Signal Ground |
An AVI with a selectable Pullup should be used. If not and external 1k pullup to 5V should be connected.
Knock Sensor
| Pin | Haltech Connection |
| 1 | Knock Signal |
| 2 | Signal Ground |
MAF Sensor
Although most users of Haltech ECUs will be deleting the MAF, it is possible to use a MAF if you prefer.
Pin | Description | Haltech Connection |
1 (Black/Light Green) | Chassis Ground | --- |
2 (Black/Blue) | Signal Ground | Signal Ground (Black/White) |
3 (Red/Black) | Air Temperature Signal | Spare AVI (AVI-7 Grey) |
4 (Red/White) | MAF Signal | Spare AVI |
5 (White/Red) | 12V+ Switched | --- |
O2 Sensors
This engine comes with a 4-wire heated Narrow Band O2 sensor. This is not suitable for engine tuning.
Adding a Haltech Single-Channel Wideband WB1 Kit (highly recommended)
For correct operation a Haltech WB1 kit is highly recommended for this application, with the provided 4.9 sensors replacing the pre-cat sensors. Sensors use a 22mm socket or spanner to remove and replace.
Vehicle Speed Sensor
This engine uses a Reluctor Vehicle Speed sensor. This sensor signal is sent to the speedometer where it is converted to a digital Hall Effect style signal that is sent to the ECU. The Haltech ECU will read this signal and needs to be set as a Hall Effect sensor type with a Falling edge and Pullup will be Disabled.
If wiring directly to the sensor. Set to Reluctor with Falling edge
| Pin | Description | Haltech Connection |
| 1 | Signal | Any Spare SPI |
| 2 | Signal Ground | Signal Ground |
Approximate Calibration Pulses Setting: 2780 pulses/km
Injector Data
Flow
The injector flow rate is measured with the injectors held wide open at 100% duty. For fuel systems with a fixed regulator pressure (often returnless systems) that is not referenced to manifold pressure the flow needs to be mapped over Manifold Pressure for accurate tuning.
Injector Flow: 230 cc/min
Dead Time
When an injector is commanded to open for a certain amount of time, the dead time is the amount of time the injector is not actually open during this period. It covers the time to energise the solenoid and begin to open and the time to close as well. There are also transient periods during which the injector is opening and closing where fuel flow is not at full capacity so this lost peak flow period is also taken into account.
OEM ECU Information
ECU Pinout
Base Maps
Base maps have been created for use with the Haltech Elite Adapter Harnesses. To use these maps they should be IMPORTED into your ECU. Follow the IMPORTING A BASE MAP guide.
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