LY7 LE0 Alloytec Engine
Information on the GM LY7 High Feature Alloytec V6 engine. It will be referred to in this guide as the Alloytec.
Haltech ECU Options
The Elite 2000 can be used without DBW, the Elite 2500 is required with DBW.
General Information
| Cylinders | 6 |
| Displacement | 3564 cc / 217.5 ci |
| Firing Order | 1,2,3,4,5,6 |
| Cylinder Orientation |
CAN
This vehicles uses CAN bus for various devices throughout the vehicle. This can include the dashboard, ABS, and Body Control. Some models use Serial. All are NOT supported by Haltech.
Model Variants
There are a number of variants of the Alloytec engine.
LE0
10.2:1 comp, continuously variable cam timing on inlet cams only, DBW, 175KW output
LY7
VVT added to exhaust cams, 190KW output
LLT
SIDI (Spark Ignition Direct Injection), 11.3:1 comp, NOT SUPPORTED
LFX
Lighter weight version of LLT, Flex Fuel support, 11.5:1 comp, NOT SUPPORTED
LWR
Dedicated LPG Vapour Injection, 12.2:1 comp, different pistons, injectors, valves, head, inlet manifold. NOT SUPPORTED
Common Models
Common to find fitted to Holden Commodore VZ to VF. Used in a number of race series as a control engine due to their relatively high output,common availability and cheap parts.
Sensor Information
Crank/Cam Sensor
This engines uses a Crank Position Sensor and a Cam Position Sensor. The crank trigger has 60x teeth with a 2x teeth missing tooth gap commonly known as a 60-2 pattern. The cam trigger has 4x teeth with 2x small and 2x larger teeth.
60-2 Crank trigger wheel
4x tooth cam trigger
Crank Sensor (models with 2-pin sensor)
A Reluctor crank position sensor is used on these models.
Reluctor Wiring
| Pin | Description | Haltech Connection (Trigger 4-core) |
| 1 (Black) | Reluctor - | Green |
| 2 (White) | Reluctor + | Yellow |
Trigger Configuration for Reluctor Sensor Model
Crank Sensor (models with 3-pin sensor)
A Hall Effect crank position sensor is used on these models.
Hall Effect Wiring
| Pin | Description | Haltech Connection (Trigger 4-core) |
| 1 | Signal Ground | Blue |
| 2 | Signal | Yellow |
| 3 | 5V+ | Orange 5V+ |
Trigger Configuration for Hall Effect Sensor Model
Cam Sensor
Hall Effect cam sensors are used. These are located on the front of the engine.
Hall Effect Wiring for Intake Bank 1
| Pin | Description | Haltech Connection (Home 4-core) |
| 1 | Signal Ground | Blue |
| 2 | Signal | Yellow |
| 3 | 5V+ | 5V+ (Orange) |
Hall Effect Wiring for all other cam sensors
| Pin | Description | Haltech Connection |
| 1 | Signal Ground | Signal Ground (Black/White) |
| 2 | Signal | Spare SPI |
| 3 | 5V+ | 5V+ (Orange) |
Ignition Coils
The ignition coils feature an internal igniter. These can be wired directly to the ECU.
| Pin | Description | Haltech Connection |
| 1 | ECU Ignition Output | Ignition Output |
| 2 | 12V+ Switched | --- |
| 3 | Ground to Cylinder Head | --- |
4 | Ground to Cylinder Head | --- |
DBW Throttle System
This engine uses a single Drive By Wire throttle body. There are reports of 6-pin and 8-pin throttle bodies on these engines.
DBW Throttle Wiring 8-Pin
Pin | Description | Haltech Connection |
A | Motor Control 1 | DBW1 (Brown/Black) |
B | Low Reference | Signal Ground (Black/White) |
C | Motor Control 2 | DBW2 (Brown/Red) |
D | Low Reference | Signal Ground (Black/White) |
E | 5V+ Reference | 5V+ (Orange) |
F | TPS Signal 2 | AVI-3 (Orange/Red) |
G | TPS Signal 1 | AVI-2 (Orange/Black) |
H | 5V+ Reference | 5V+ (Orange) |
DBW Throttle Wiring 6-Pin
Pin | Description | Haltech Connection |
| A | Motor + | DBW1 (Brown/Black) |
B | Motor - | DBW2 (Brown/Red) |
C | Signal Ground | Signal Ground (Black/White) |
D | TPS1 | AVI-2 (Orange/Black) |
E | 5V+ | 5V+ (Orange) |
F | TPS2 | AVI-3 (Orange/Red) |
DBW Accelerator Pedal Position Sensors Connection
| Pin | Description | Haltech Connection |
| 1 | 5V+ 1 | 5V+ (Orange) |
| 2 | 5V+ 2 | 5V+ (Orange) |
| 3 | APP2 Signal | AVI-4 (Orange/Yellow) |
| 4 | Signal Ground 2 | Signal Ground (Black/White |
| 5 | Signal Ground 1 | Signal Ground (Black/White) |
| 6 | APP1 Signal | AVI-5 (Orange/Green) |
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.
Variable Cams
This engine comes with continuously variable cam timing on either 2x or 4x camshafts. This is supported by the Haltech Elite ECU.
Cam Position Sensor wiring information is in the Crank/Cam sensor section.
Control solenoids use any spare output other than Ignition Outputs. The other pin is connected to a 12V+ switched source.
Idle Valve
This engine uses the Drive By Wire Throttle to control idle speed.
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 Inlet Air Temperature Sensor is incorporated in the MAF Sensor on this engine. See the MAF Sensor section for wiring information. If the MAF has been deleted a replacement Air Temperature Sensor should be installed in the inlet as close as possible to the vacuum source for the MAP sensor. The Haltech HT-010206 is suitable for this.
Haltech HT-010206 Air Temperature Sensor
Wiring is not polarity sensitive.
| Pin | Haltech Connection |
| 1 | Any Spare AVI* (AVI7-Grey) |
| 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
This engine comes with 2x non-resonant style knock sensors and these can be used with your Elite 1000, 1500, 2000, or 2500 ECU.
| 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 |
| A | MAF Signal | Spare AVI |
| B | 12V+ Switched | --- |
| C | Sensor Ground | Signal Ground (Black/White) |
| D | Air Temperature Signal | Spare AVI (AVI-7 Grey) |
| E | Air Temperature Signal Ground | Signal Ground (Black/White) |
O2 Sensors
This engine has Narrow Band O2 sensors. Although they can be used for light load tuning for Lambda 1.0, they cannot be used for tuning under power.
Adding a Haltech 2-channel Wideband WB2 Kit (highly recommended)
For correct operation a Haltech WB2 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
Models with an Aisin AY6 gearbox have a Hall Effect Vehicle Speed sensor.
Models with a Tremec T56 gearbox have a Reluctor Vehicle Speed sensor.
Aisin Hall Effect Speed Sensor
| Pin | Description | Haltech Connection |
| 1 | ||
| 2 | ||
| 3 |
Approximate Calibration Pulses Setting: 4000 pulses/mile (from OEM Workshop Manual Specs)
Tremec Reluctor Speed Sensor Wiring
| Pin | Description | Haltech Connection |
| 1 | Signal + | Any Spare SPI |
| 2 | Signal - | Signal Ground |
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.
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
VZ Commodore ECU
VE Commodore ECU
Location
ECU Pinout
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