September 14, 2023

Haltech - 1JZ/2JZ Technical Information

Information on the Toyota 2JZ-GTE, 2JZ-GE, 1JZ-GTE engine

Haltech ECU Options

Haltech ECUs do not support the ETCS-i throttle

Recommended Haltech ECU Models

Haltech ECU Model	Support Level
Elite 750	Sequential Fuel and Ignition, VVTi, OEM Stepper Idle NOT Support
Elite 2000	Sequential Fuel and Ignition, VVTi, OEM Stepper Idle Supported
Elite 2500	Sequential Fuel and Ignition, VVTi, OEM Stepper Idle Supported. Full DBW Support

General Information

Cylinders	6
Displacement	1JZ - 2492 cc 2JZ - 2997cc
Firing Order	1,5,3,6,2,4
Cylinder Orientation	Cylinder 1 located at front of engine

Model Variants

There are a number of variants of the Toyota JZ engine family.

2JZ-GTE

Sequential Twin Turbos, Sequential Fuel, Direct Fire Ignition, Stepper Motor Idle, 8.5:1 comp

2JZ-GTE VVTi

Sequential Twin Turbos, Sequential Fuel, Waste Spark Ignition, Stepper Motor Idle, Some have ETCSi Throttle System (NOT SUPPORTED), VVTi Variable Intake Cam, 8.5:1 comp

2JZ-GE Distributor

Sequential Fuel, Distributor Ignition, Stepper Motor Idle, Variable Intake, 10.0:1 comp

2JZ-GE VVTi

Sequential Fuel, Waste Spark Ignition, Stepper Motor Idle, Variable Intake, VVTi Variable Intake Cam, 10.0:1 comp

1JZ-GTE

Twin Parallel Turbos, Semi-Sequential Fuel, Direct Fire Ignition, Stepper Motor Idle, 8.5:1 comp

1JZ-GTE VVTi

Single Turbo, Sequential Fuel, Waste Spark Ignition, Stepper Motor Idle, VVTi variable intake cam, Some have ETCSi Throttle System (NOT SUPPORTED), 9.0:1 comp

Sensor Information

Crank/Cam Sensor

The turbo models of this engine all use a Crank Position Sensor and a Cam Position Sensor. Some aspirated models use a Distributor instead of a crank and cam sensor.

Crank Sensor

Crank sensor models of the 2JZ and 1JZ use a crank trigger located as part of the timing belt drive gear on the crank with the sensor near the alternator. Non-VVTi engine have a 12x tooth, and VVTi models have a 36-2 (36 teeth with 2 missing teeth.

12x Non VVTi

36-2 VVTi

2JZ Crank Sensor

Pin	Description	Haltech Connection (Trigger 4-core)
1	Trigger +	Yellow
2	Trigger -	Green

(if using OEM Toyota wiring, pin 2 should go to Signal Ground)

Cam Sensor

Two Cam Position Sensors are present on the Non VVTi engine, both are Reluctor sensors with a single tooth pickup

The sensors are located on the LHS of the cylinder head near the intake manifold/injectors with G1 located midway along the engine, and G2 located towards the rear. The G2 sensor is used with Haltech Terminated Harnesses.

The VVTi models use a single Reluctor Cam Position Sensor which has a 3x tooth pickup.

2JZ Cam Sensor

Pin	Description	Haltech Connection (Home 4-core)
1	Home +	Yellow
2	Home -	Green

(if using OEM Toyota wiring, pin 2 should go to Signal Ground)

Distributor

A 3x Reluctor trigger system is used on the 2JZ-GE engine. This has a 24x tooth pickup with a single Reluctor pickup (NE), and has a second 1-tooth pickup that has 2x separate sensors (G1 and G2) with only one of the pickups required for Haltech use. All sensors use a common shared wire back to the ECU (G-).

2JZ-GE Distributor

OEM Wiring Diagram

2JZ-GE Distributor Wiring

OEM Connection	Description	Haltech Connection
Pin 1 NE (24x) Black	Trigger +	Yellow(Trigger 4-core)
Pin 2 G1 (1x) Red	Home +	Yellow (Home 4-core)
Pin 3 G2 (1x) White	No Connection	---
Pin 4 G- Green	Signal Ground	Blue (Trigger 4-core)

This model requires the Haltech Trigger and Home Grounds to be Enabled

Trigger Configuration - Non VVT (G2 - Rear Cam Sensor)

Notes:

If OEM Wiring is used such as when an adapter harness is installed, then the Ground Reference should be changed to ENABLED for both Trigger and Home.

If the G1 Mid Cam Sensor is used the TDC Offset will need to be increased by 360 to become 365.

Trigger Configuration - VVT

Ignition Coils and Igniter

The ignition coils on this engine require an external igniter module. Haltech HPI igniter module are a good choice for this if the OEM unit is not available.

Direct Fire Models

Non-VVTi models use a coil per plug in Direct Fire

2JZ-GTE Non VVTi Igniter Module

This igniter uses Constant Charge with a Falling Edge. Using other settings will damage the ignition system.

Waste Spark Models

VVTi models use Waste Spark. Coil is on plug with a lead providing spark to the paired cylinder.

2JZ-GTE VVTi Igniter Module

Wiring information is visible on the igniter body.

Pin	Function	Haltech Connection
C1	Coil #1 and 6 -ve	---
+B	12V+	---
TAC	Tacho	---
T1	ECU Ignition Output #1	Ignition Output 1
T2	ECU Ignition Output #2	Ignition Output 2
T3	ECU Ignition Output #3	Ignition Output 3
IGF	Ignition Fail Signal	---
GND	Ground to Cylinder Head	---
C3	Coil #3 and 4 -ve	---
C2	Coil #2 and 5 -ve	---

This igniter uses Constant Charge with a Falling Edge. Using other settings will damage the ignition system.

Distributor Models

Label	Function	OEM Wire Colour	Haltech Connection
C	Coil -	Black/White	No Connection
EXT	Tacho	Black	No Connection
B	Coil +	Black/Red	No Connection
T	IGT	White	Ignition Output#1
F	IGF	White/Red	No Connection

This igniter uses Constant Charge with a Falling Edge. Using other settings will damage the ignition system.

Dwell Time

Coil On Plug Models

Setting dwell higher than 2.2ms@14V can cause the ignition to breakup at around 6000rpm, feeling like an RPM Limiter.

Distributor Models

VVTi Variable Cam

The Toyotai VVT-i system present on the 2JZ engine controls only the inlet cam. It uses the same single cam position sensor used for engine sync to know where exactly the cam is. The ECU controls the movement of the cam via a single output to a solenoid that is powered from 12V+. The control system operates in closed loop to maintain the cam in the target position.

For these engines, the Cam Control should be set to use the HOME for the input.

Throttle Position Sensor

This engine uses a cable operated throttle body with a position sensor.

2JZ-GTE Non-VVTi TPS

2JZ-GTE VVTI TPS

Left to Right from Above image

OEM Wiring	Haltech Wiring
Pin 1 - VC	5V+
Pin 2 - VTA	Signal
Pin 3 - IDL	No Connection
Pin 4 - E2	Signal Ground

MAP Sensor

This vehicle comes with a MAP sensor. This is located on the intake manifold.

OEM Wiring	Description
1 - Brown	Signal Ground
2 - Yellow/Green	Signal
3 - Blue/Red	5V+

This sensor only reads up to 126 kpa of boost pressure.

Calibration: Use "MAP - Toyota Supra JZA80 2JZGTE 079800-3250.cal"

Although these engines come with a MAP sensor, if preferred the internal Haltech MAP sensor can be used which reads up to 200 kPa of boost pressure.

For higher boost levels an external MAP sensor should be used instead.

Idle Valve

This engine uses a Stepper Motor style idle valve.

Pin	Haltech Connection
A	Stepper 4
B	Stepper 1
C	12V+ Ign Switch or No Connection
D	12V+ Ign Switch or No Connection
E	Stepper 3
F	Stepper 2

Drive Type: Low Side if 12V+ is connected. Both if 12V+ is not connected

Steps:240 Speed:75

Coolant Temperature

Located under the Cylinder#1 inlet runner

Wiring is not polarity sensitive

Calibration: Use "Temperature - Toyota JZX100 Coolant Sensor.cal"

Created for Haltech ECUs using a 1k pullup to 5V

Air Temp

Located on the inlet plenum

Wiring is not polarity sensitive.

Pin	Haltech Connection
1	Air Temp Signal
2	Signal Ground

Calibration: Use "Temperature - GM Air Sensor.cal"

Created for Haltech ECUs using a 1k pullup to 5V

Knock Sensor

The 2JZ Engine uses 2x knock sensors. One for the front 3 cylinder and one for the back 3 cylinders.

These are a single wire Resonant Type sensor which are specific to only this engine. They will be only reliable with an unmodified engine.

For more reliable knock control they should be updated to use a "donut" style Non-Resonant sensor that can be tuned to suit the engine.

The Haltech HT-011100 sensor is suitable for this application.

O2 Sensors

The 2JZ engine uses older style Narrowband Sensors. It is strongly recommended to replace these with Wideband O2 sensors.

Adding a Haltech Wideband Kit (highly recommended)

For correct operation a Haltech WB1 kit is highly recommended for this application, with the provided 4.9 sensor replacing the pre-cat sensor. Sensors use a 22mm socket or spanner to remove and replace.

Vehicle Speed Sensor

This engine uses a Vehicle Speed sensor. Some models use a 3-pin Hall Sensor that sends the signal to the speedo, then this sends a signal to the OEM ECU.

Some use a 2-pin Reluctor sensor wired directly to the OEM ECU.

Hall Effect Speed Sensor