2uzfe Ecu Pinout -
If you are using an ECU from a vehicle equipped with an engine immobilizer (most post-2002 Lexus/Toyota models), the ECU will not allow spark or fuel unless it reads the correct transponder key code.
| Pin No. | Wire Color | Signal Name | Description |
| :--- | :--- | :--- | :--- |
| 1 | W-R | +B | Battery Positive (Constant 12V) |
| 2 | B-O | E1 | ECU Ground (Sensor Ground) |
| 3 | B-R | E01 | Power Ground (Injector/IGN) |
| 4 | B-W | E02 | Power Ground (Injector/IGN) |
| 6 | B-Y | #10 | Injector Cylinder 1 |
| 7 | G | #20 | Injector Cylinder 2 |
| 8 | G-R | #30 | Injector Cylinder 3 |
| 9 | G-Y | #40 | Injector Cylinder 4 |
| 10 | R-Y | #50 | Injector Cylinder 5 |
| 11 | R-G | #60 | Injector Cylinder 6 |
| 12 | W-L | #70 | Injector Cylinder 7 |
| 13 | L-Y | #80 | Injector Cylinder 8 |
| 15 | W-B | ELS | Electrical Load Signal |
| 16 | G-L | VTA | Throttle Position Sensor Signal |
| 17 | B | IDL | Idle Switch Signal |
| 20 | P-L | ACIS | Acoustic Control Induction Valve |
| 21 | Y | VCC | Sensor Power Supply (+5V) |
| 22 | L-R | VG | Mass Air Flow Meter Signal |
| 23 | B-B | E2 | Sensor Ground |
| 24 | W | KNK1 | Knock Sensor 1 |
| 25 | L-W | OXL1 | Oxygen Sensor (Bank 1 Sensor 1) |
| 26 | P-B | THW | Engine Coolant Temp Sensor |
| 27 | B-Y | EGR | EGR Valve Control |
| 29 | G-W | NE+ | Crankshaft Position Sensor (+) |
| 30 | R | NE- | Crankshaft Position Sensor (-) |
| 31 | R-B | IGT1 | Ignition Coil 1 |
The 2UZ-FE uses a "waste spark" style setup or coil-on-plug (depending on year) driven by the ECU.
The Toyota 2UZ-FE is legendary. This 4.7L V8, found in the Land Cruiser 100 Series (UZJ100), Lexus LX470, Tundra (first gen), and Sequoia, is revered for its bulletproof reliability and silky-smooth power delivery. However, whether you are diagnosing a misfire, wiring a standalone ECU, or performing a daunting engine swap into a 4Runner or FJ40, understanding the ECU pinout is non-negotiable.
Unlike a simple carbureted engine, the 2UZ-FE relies on a complex web of sensors, actuators, and communication networks. This article breaks down the architecture of the Engine Control Unit (ECU) connectors, the critical pins you need to know, and the variations between model years.
The 2UZ-FE is a phenomenal engine, but it is a "conversational" ECU. It expects to talk to the body module, the transmission computer, and the dashboard. When you isolate the ECU for a swap or diagnose a corroded wire, the pinout is your map.
Take your time. Label your wires. And never assume a pin is empty just because you don't see a wire in the connector.
Have a specific 2UZ issue? Dropped a valve seat? Blown heater tee? Let me know in the comments below.
Disclaimer: This guide is for informational purposes. Wiring a vehicle incorrectly can cause fires or engine damage. Always verify your findings with a factory service manual specific to your VIN.
Toyota 2UZ-FE 4.7L V8 engine control unit (ECU) has multiple pinout configurations depending on the vehicle model (e.g., Land Cruiser 100, Tundra, Sequoia) and year (early non-VVT-i vs. late VVT-i models). Most 2UZ-FE systems utilize a multi-plug Denso ECU to manage Sequential Multiport Fuel Injection (SFI) Electronic Throttle Control (ETCS-i) Core ECU Pin Connections
The following are critical terminals for troubleshooting or standalone wiring: LC100 Factory Service Manual Description Constant Power Always maintains 9–14V for ECU memory. Switched Power Main power from the EFI relay when ignition is ON. EFI Relay Control ECU signal to trigger the main power relay. E1 / E2 / E01 Critical sensor and chassis ground points. Crank Position Engine speed and timing reference signal. Ignition Triggers Signals sent to individual ignition coils. Injector Control Individual ground-side triggers for fuel injectors. Throttle Position Power (5V) and signal for the throttle sensor. MAF Sensor Mass Air Flow signal (typically 0.5–3.0V at idle). Key Variations by Vehicle Land Cruiser 100 (1998–2002):
Features 32-bit and 16-bit CPUs with specific connectors for the A/F ratio sensors (Bank 1/Bank 2) and immobilizer system integration. Tundra & Sequoia:
Early Tundra models (2000–2004) use a different pin layout compared to later VVT-i versions (2005+), which added secondary air injection and different ETCS-i protocols. VVT-i Models: These ECUs include additional pins for OCV (Oil Control Valves) to manage variable valve timing. LC100 Factory Service Manual Troubleshooting Tips 2uz lc100 wiring and fitting instructions UZJ100 to KZJ78 2uzfe ecu pinout
For accurate documentation on the Toyota 2UZ-FE engine control unit (ECU), several technical manuals and wiring diagrams provide the necessary pinout data for troubleshooting or engine swaps. Key Technical Documents and Diagrams
The following resources offer detailed terminal specifications and electrical layouts:
2UZ-FE Engine Control System (SFI System): This document contains a full diagram of the Sequential Fuel Injection system, showing connections for camshaft and crankshaft position sensors, fuel injectors, and ignition coils. 2UZ-FE ECU Pinout and Wiring Diagram (Scribd)
2UZ-FE ECM Terminal Specifications: A specific guide for measuring terminal voltage and identifying pin functions for models like the 2004 Toyota Tundra and Sequoia. 2uz Ecm 2004 (Scribd)
Toyota Land Cruiser 2UZ-FE Engine Supplement (RM895E): The official workshop supplement for LC 100 series vehicles. It covers diagnostics for the ECU power source circuit and charging systems. LC 100/105 Series - 2UZ-FE Supplement (Mif.pg.gda.pl) 2004 2UZ-FE Engine Repair Manual
: A comprehensive flipbook guide for repair procedures, including electrical component locations. 2004 2UZ-FE Repair Manual (FlipHTML5) Common Pin Identification (Reference)
While specific pin locations can vary by year (e.g., non-VVTi vs. VVTi models), typical critical terminals include:
Sensors: VG (Mass Air Flow), NE (Crankshaft Position), G2 (Camshaft Position), and VTA (Throttle Position).
Actuators: #10 through #80 (Injectors) and IGT/IGC signals for Ignition Coils.
Power/Ground: MREL (EFI Relay), +B (Battery Power), and E1 (Engine Ground).
For those performing swaps, specialized video guides on building a custom 2UZ harness or identifying connectors can help visualize the physical plugs alongside these diagrams.
Building An Engine Harness From Scratch // 2UZ V8 '74 Celica If you are using an ECU from a
| Pin No. | Circuit | Function | Notes |
| :--- | :--- | :--- | :--- |
| 1 | BATT | Battery Positive | Constant 12V (Backup Power) |
| 2 | +B | Main Relay Power | Switched 12V |
| 14 | E1 | Engine Ground | Critical Ground |
| 15 | E2 | Sensor Ground | Critical Ground |
| 16 | E01 | Power Ground | ECU Ground to Block |
| 17 | E02 | Power Ground | ECU Ground to Block |
The 2UZ-FE is a million-mile engine, but its electronics are its Achilles' heel. Having the correct ECU pinout transforms a spaghetti mess of wires into a logical system.
Bookmark this guide, print the official diagram for your specific year, and take your time. Wiring the 2UZ correctly the first time is infinitely easier than chasing a blown 20-amp EFI fuse on the side of the road.
Got a specific pin you can't figure out? Check the color codes above—Toyota was mercifully consistent with wire colors across decades. If the wire is Light Green with a Black stripe, it is almost always the Engine Coolant Temp sensor on every 2UZ made.
The 2UZ-FE engine, common in the Toyota Land Cruiser, Tundra, and Sequoia, utilizes a complex Engine Control Module (ECM) to manage its sequential fuel injection (SFI) and ignition systems. The ECU pinout varies slightly between non-VVTi (early 2000s) and VVTi models (roughly 2005+), but the core power, ground, and sensor terminal logic remains consistent across the platform. Core ECU Terminals and Standard Voltages
The following table outlines primary power, ground, and essential sensor terminals often used for diagnostics or wiring swaps. Pin Symbol Connector-Pin No. Description Standard Voltage (IG ON) BATT Battery Power (Constant) 9 – 14 V +B Switched Power (IG Switch) 9 – 14 V MREL EFI Main Relay Control 9 – 14 V E1 Engine Ground 0 V (Ground) VC Sensor Reference Power 4.5 – 5.5 V VG Mass Air Flow (MAF) Signal 0.5 – 3.0 V (Idling) THW Coolant Temp Signal (ECT) 0.2 – 1.0 V (at 80°C) VTA1 Throttle Position Signal 0.5 – 1.2 V (Closed) Key Engine Control Components
Ignition & Injection: The ECU manages 8 individual ignition coils and fuel injectors (Pins #10 through #80). Position Sensors:
NE+ / NE-: Crankshaft position sensor signals used to determine engine speed and timing.
G2+ / G2-: Camshaft position sensor signals for identifying cylinder #1 compression stroke.
Throttle Control: Modern 2UZ-FE engines use an Electronic Throttle Control System (ETCS-i). The M+ (E7-5) and M- (E7-4) terminals drive the throttle motor, while VTA1 and VTA2 provide redundant position feedback. Diagnostic Resources
For detailed troubleshooting or pin-by-pin identification for a specific year, you can access full technical documents via these sources:
2UZ-FE ECM Terminal Specifications (Scribd): Detailed voltage and pulse waveform data. Disclaimer: This guide is for informational purposes
2004 2UZ-FE Engine Repair Manual (FlipHTML5): A comprehensive guide for mechanical and electrical systems.
Engine Control Wiring Diagram (Scribd): High-level overview of the EFI and ignition circuits.
Are you working on a wiring harness swap or diagnosing a specific fault code? 2UZ-FE ECU Pinout and Wiring Diagram | PDF | Fuel Injection
The ECU pinout for the Toyota 2UZ-FE V8 engine varies significantly between model years, particularly with the introduction of ETCS-i (Electronic Throttle Control System-intelligent) in late 2002 and VVT-i (Variable Valve Timing with intelligence) around 2005-2007. Core Pinout Functions (2004–2006 Standard)
For common applications like the 2004–2006 Toyota Tundra or Land Cruiser 100, the Engine Control Module (ECM) uses multiple connectors (labeled E3 through E7) to manage the Sequential Fuel Injection (SFI) and ignition systems. Terminal Symbol Connector-Pin Description Standard Voltage/Condition MREL EFI Main Relay 9–14 V (Ignition ON) +B / +B2 Power source for ECU 9–14 V (Ignition ON) VC Sensor power supply 4.5–5.5 V (Ignition ON) NE+ / NE- E5-25 / E5-24 Crankshaft Position Pulse generation (Engine idling) G2+ / G2- E5-19 / E5-29 Camshaft Position Pulse generation (Engine idling) #10 to #80 E5/E7 pins Fuel Injectors 1–8 Pulse generation (Engine idling) IGT1 to IGT8 E7/E5 pins Ignition Signals Pulse generation (Engine idling) M+ / M- E7-5 / E7-4 Throttle Motor Pulse generation (Engine idling) Key Wiring & Component Guides
Sensor Inputs: The ECU processes signals for mass air flow (VG), engine coolant temperature (THW), and intake air temperature (THA) to regulate fuel delivery.
Throttle Systems: Early 2UZ-FE engines used a standard throttle body, while later models transitioned to the ETCS-i fly-by-wire system, which requires its own 15amp fused power source to function correctly.
VVT-i Models: Post-2007 engines feature VVT-i, which manages throttle position and camshaft timing to improve efficiency across all RPM ranges.
Immobilizer Integration: Many stock ECUs include an integrated immobilizer system that requires a transponder key, amplifier, and coil to start the engine.
For detailed wiring schematics and full pin tables for specific years, you can reference technical documents on Scribd (2004 Tundra) or Scribd (2006 ECM Specs).
Are you working on a standalone swap or troubleshooting a specific sensor fault? AI responses may include mistakes. Learn more How to Wire up a 1UZ engine (VVTI and non-VVTI)
If you are using an ECU from a vehicle equipped with an engine immobilizer (most post-2002 Lexus/Toyota models), the ECU will not allow spark or fuel unless it reads the correct transponder key code.
| Pin No. | Wire Color | Signal Name | Description |
| :--- | :--- | :--- | :--- |
| 1 | W-R | +B | Battery Positive (Constant 12V) |
| 2 | B-O | E1 | ECU Ground (Sensor Ground) |
| 3 | B-R | E01 | Power Ground (Injector/IGN) |
| 4 | B-W | E02 | Power Ground (Injector/IGN) |
| 6 | B-Y | #10 | Injector Cylinder 1 |
| 7 | G | #20 | Injector Cylinder 2 |
| 8 | G-R | #30 | Injector Cylinder 3 |
| 9 | G-Y | #40 | Injector Cylinder 4 |
| 10 | R-Y | #50 | Injector Cylinder 5 |
| 11 | R-G | #60 | Injector Cylinder 6 |
| 12 | W-L | #70 | Injector Cylinder 7 |
| 13 | L-Y | #80 | Injector Cylinder 8 |
| 15 | W-B | ELS | Electrical Load Signal |
| 16 | G-L | VTA | Throttle Position Sensor Signal |
| 17 | B | IDL | Idle Switch Signal |
| 20 | P-L | ACIS | Acoustic Control Induction Valve |
| 21 | Y | VCC | Sensor Power Supply (+5V) |
| 22 | L-R | VG | Mass Air Flow Meter Signal |
| 23 | B-B | E2 | Sensor Ground |
| 24 | W | KNK1 | Knock Sensor 1 |
| 25 | L-W | OXL1 | Oxygen Sensor (Bank 1 Sensor 1) |
| 26 | P-B | THW | Engine Coolant Temp Sensor |
| 27 | B-Y | EGR | EGR Valve Control |
| 29 | G-W | NE+ | Crankshaft Position Sensor (+) |
| 30 | R | NE- | Crankshaft Position Sensor (-) |
| 31 | R-B | IGT1 | Ignition Coil 1 |
The 2UZ-FE uses a "waste spark" style setup or coil-on-plug (depending on year) driven by the ECU.
The Toyota 2UZ-FE is legendary. This 4.7L V8, found in the Land Cruiser 100 Series (UZJ100), Lexus LX470, Tundra (first gen), and Sequoia, is revered for its bulletproof reliability and silky-smooth power delivery. However, whether you are diagnosing a misfire, wiring a standalone ECU, or performing a daunting engine swap into a 4Runner or FJ40, understanding the ECU pinout is non-negotiable.
Unlike a simple carbureted engine, the 2UZ-FE relies on a complex web of sensors, actuators, and communication networks. This article breaks down the architecture of the Engine Control Unit (ECU) connectors, the critical pins you need to know, and the variations between model years.
The 2UZ-FE is a phenomenal engine, but it is a "conversational" ECU. It expects to talk to the body module, the transmission computer, and the dashboard. When you isolate the ECU for a swap or diagnose a corroded wire, the pinout is your map.
Take your time. Label your wires. And never assume a pin is empty just because you don't see a wire in the connector.
Have a specific 2UZ issue? Dropped a valve seat? Blown heater tee? Let me know in the comments below.
Disclaimer: This guide is for informational purposes. Wiring a vehicle incorrectly can cause fires or engine damage. Always verify your findings with a factory service manual specific to your VIN.
Toyota 2UZ-FE 4.7L V8 engine control unit (ECU) has multiple pinout configurations depending on the vehicle model (e.g., Land Cruiser 100, Tundra, Sequoia) and year (early non-VVT-i vs. late VVT-i models). Most 2UZ-FE systems utilize a multi-plug Denso ECU to manage Sequential Multiport Fuel Injection (SFI) Electronic Throttle Control (ETCS-i) Core ECU Pin Connections
The following are critical terminals for troubleshooting or standalone wiring: LC100 Factory Service Manual Description Constant Power Always maintains 9–14V for ECU memory. Switched Power Main power from the EFI relay when ignition is ON. EFI Relay Control ECU signal to trigger the main power relay. E1 / E2 / E01 Critical sensor and chassis ground points. Crank Position Engine speed and timing reference signal. Ignition Triggers Signals sent to individual ignition coils. Injector Control Individual ground-side triggers for fuel injectors. Throttle Position Power (5V) and signal for the throttle sensor. MAF Sensor Mass Air Flow signal (typically 0.5–3.0V at idle). Key Variations by Vehicle Land Cruiser 100 (1998–2002):
Features 32-bit and 16-bit CPUs with specific connectors for the A/F ratio sensors (Bank 1/Bank 2) and immobilizer system integration. Tundra & Sequoia:
Early Tundra models (2000–2004) use a different pin layout compared to later VVT-i versions (2005+), which added secondary air injection and different ETCS-i protocols. VVT-i Models: These ECUs include additional pins for OCV (Oil Control Valves) to manage variable valve timing. LC100 Factory Service Manual Troubleshooting Tips 2uz lc100 wiring and fitting instructions UZJ100 to KZJ78
For accurate documentation on the Toyota 2UZ-FE engine control unit (ECU), several technical manuals and wiring diagrams provide the necessary pinout data for troubleshooting or engine swaps. Key Technical Documents and Diagrams
The following resources offer detailed terminal specifications and electrical layouts:
2UZ-FE Engine Control System (SFI System): This document contains a full diagram of the Sequential Fuel Injection system, showing connections for camshaft and crankshaft position sensors, fuel injectors, and ignition coils. 2UZ-FE ECU Pinout and Wiring Diagram (Scribd)
2UZ-FE ECM Terminal Specifications: A specific guide for measuring terminal voltage and identifying pin functions for models like the 2004 Toyota Tundra and Sequoia. 2uz Ecm 2004 (Scribd)
Toyota Land Cruiser 2UZ-FE Engine Supplement (RM895E): The official workshop supplement for LC 100 series vehicles. It covers diagnostics for the ECU power source circuit and charging systems. LC 100/105 Series - 2UZ-FE Supplement (Mif.pg.gda.pl) 2004 2UZ-FE Engine Repair Manual
: A comprehensive flipbook guide for repair procedures, including electrical component locations. 2004 2UZ-FE Repair Manual (FlipHTML5) Common Pin Identification (Reference)
While specific pin locations can vary by year (e.g., non-VVTi vs. VVTi models), typical critical terminals include:
Sensors: VG (Mass Air Flow), NE (Crankshaft Position), G2 (Camshaft Position), and VTA (Throttle Position).
Actuators: #10 through #80 (Injectors) and IGT/IGC signals for Ignition Coils.
Power/Ground: MREL (EFI Relay), +B (Battery Power), and E1 (Engine Ground).
For those performing swaps, specialized video guides on building a custom 2UZ harness or identifying connectors can help visualize the physical plugs alongside these diagrams.
Building An Engine Harness From Scratch // 2UZ V8 '74 Celica
| Pin No. | Circuit | Function | Notes |
| :--- | :--- | :--- | :--- |
| 1 | BATT | Battery Positive | Constant 12V (Backup Power) |
| 2 | +B | Main Relay Power | Switched 12V |
| 14 | E1 | Engine Ground | Critical Ground |
| 15 | E2 | Sensor Ground | Critical Ground |
| 16 | E01 | Power Ground | ECU Ground to Block |
| 17 | E02 | Power Ground | ECU Ground to Block |
The 2UZ-FE is a million-mile engine, but its electronics are its Achilles' heel. Having the correct ECU pinout transforms a spaghetti mess of wires into a logical system.
Bookmark this guide, print the official diagram for your specific year, and take your time. Wiring the 2UZ correctly the first time is infinitely easier than chasing a blown 20-amp EFI fuse on the side of the road.
Got a specific pin you can't figure out? Check the color codes above—Toyota was mercifully consistent with wire colors across decades. If the wire is Light Green with a Black stripe, it is almost always the Engine Coolant Temp sensor on every 2UZ made.
The 2UZ-FE engine, common in the Toyota Land Cruiser, Tundra, and Sequoia, utilizes a complex Engine Control Module (ECM) to manage its sequential fuel injection (SFI) and ignition systems. The ECU pinout varies slightly between non-VVTi (early 2000s) and VVTi models (roughly 2005+), but the core power, ground, and sensor terminal logic remains consistent across the platform. Core ECU Terminals and Standard Voltages
The following table outlines primary power, ground, and essential sensor terminals often used for diagnostics or wiring swaps. Pin Symbol Connector-Pin No. Description Standard Voltage (IG ON) BATT Battery Power (Constant) 9 – 14 V +B Switched Power (IG Switch) 9 – 14 V MREL EFI Main Relay Control 9 – 14 V E1 Engine Ground 0 V (Ground) VC Sensor Reference Power 4.5 – 5.5 V VG Mass Air Flow (MAF) Signal 0.5 – 3.0 V (Idling) THW Coolant Temp Signal (ECT) 0.2 – 1.0 V (at 80°C) VTA1 Throttle Position Signal 0.5 – 1.2 V (Closed) Key Engine Control Components
Ignition & Injection: The ECU manages 8 individual ignition coils and fuel injectors (Pins #10 through #80). Position Sensors:
NE+ / NE-: Crankshaft position sensor signals used to determine engine speed and timing.
G2+ / G2-: Camshaft position sensor signals for identifying cylinder #1 compression stroke.
Throttle Control: Modern 2UZ-FE engines use an Electronic Throttle Control System (ETCS-i). The M+ (E7-5) and M- (E7-4) terminals drive the throttle motor, while VTA1 and VTA2 provide redundant position feedback. Diagnostic Resources
For detailed troubleshooting or pin-by-pin identification for a specific year, you can access full technical documents via these sources:
2UZ-FE ECM Terminal Specifications (Scribd): Detailed voltage and pulse waveform data.
2004 2UZ-FE Engine Repair Manual (FlipHTML5): A comprehensive guide for mechanical and electrical systems.
Engine Control Wiring Diagram (Scribd): High-level overview of the EFI and ignition circuits.
Are you working on a wiring harness swap or diagnosing a specific fault code? 2UZ-FE ECU Pinout and Wiring Diagram | PDF | Fuel Injection
The ECU pinout for the Toyota 2UZ-FE V8 engine varies significantly between model years, particularly with the introduction of ETCS-i (Electronic Throttle Control System-intelligent) in late 2002 and VVT-i (Variable Valve Timing with intelligence) around 2005-2007. Core Pinout Functions (2004–2006 Standard)
For common applications like the 2004–2006 Toyota Tundra or Land Cruiser 100, the Engine Control Module (ECM) uses multiple connectors (labeled E3 through E7) to manage the Sequential Fuel Injection (SFI) and ignition systems. Terminal Symbol Connector-Pin Description Standard Voltage/Condition MREL EFI Main Relay 9–14 V (Ignition ON) +B / +B2 Power source for ECU 9–14 V (Ignition ON) VC Sensor power supply 4.5–5.5 V (Ignition ON) NE+ / NE- E5-25 / E5-24 Crankshaft Position Pulse generation (Engine idling) G2+ / G2- E5-19 / E5-29 Camshaft Position Pulse generation (Engine idling) #10 to #80 E5/E7 pins Fuel Injectors 1–8 Pulse generation (Engine idling) IGT1 to IGT8 E7/E5 pins Ignition Signals Pulse generation (Engine idling) M+ / M- E7-5 / E7-4 Throttle Motor Pulse generation (Engine idling) Key Wiring & Component Guides
Sensor Inputs: The ECU processes signals for mass air flow (VG), engine coolant temperature (THW), and intake air temperature (THA) to regulate fuel delivery.
Throttle Systems: Early 2UZ-FE engines used a standard throttle body, while later models transitioned to the ETCS-i fly-by-wire system, which requires its own 15amp fused power source to function correctly.
VVT-i Models: Post-2007 engines feature VVT-i, which manages throttle position and camshaft timing to improve efficiency across all RPM ranges.
Immobilizer Integration: Many stock ECUs include an integrated immobilizer system that requires a transponder key, amplifier, and coil to start the engine.
For detailed wiring schematics and full pin tables for specific years, you can reference technical documents on Scribd (2004 Tundra) or Scribd (2006 ECM Specs).
Are you working on a standalone swap or troubleshooting a specific sensor fault? AI responses may include mistakes. Learn more How to Wire up a 1UZ engine (VVTI and non-VVTI)
