1kz Ecu Pinout __full__ <PROVEN »>

Important: Know Your ECU Version

Toyota used two distinct ECU families for the 1KZ-TE.

| Version | Vehicle Examples | Key Features | |--------|----------------|--------------| | Early (pre-1996) | Hilux Surf, early Hiace, some Prado | 3-plug ECU, basic diagnostics, 2-row main connector | | Late (1996-2002+) | Prado 90/95, later Hiace, Granvia | 4-plug ECU, OBD-II support (JDM or Euro), immobilizer in some markets |

⚠️ Pinouts vary by market (JDM, Euro, General) and transmission (A/T vs M/T). Always verify with your exact ECU part number (e.g., 89661-3A230).

The Three Main Types

  1. Early Type (Pre-1996 – 2-plug ECU)

    • Connectors: Two 22-pin plugs (often grey and white).
    • Vehicles: Early Hilux Surf (KZN130), early Prado (KZJ90).
    • Features: Mechanical feedback distributor-type injection pump, basic EGR, no immobilizer in most markets.
    • Pinout Complexity: Simple. Easier to swap.

  2. Mid-Type (1996-2002 – 3-plug ECU)

    • Connectors: Three 22-pin plugs (A, B, and C connectors).
    • Vehicles: Late KZN130, KZN185 (Hilux Surf), KZJ95 (Prado).
    • Features: Spill control valve (SCV) fuel control, more sophisticated cold start advance, glow plug timer integrated.
    • Pinout Complexity: Moderate. This is the most common pinout in swaps.

  3. Late Type (2002-2006 – 4-plug with Immobilizer)

    • Connectors: Three main engine plugs + one small 4-pin immobilizer/ECU security plug.
    • Vehicles: European Prados, Coaster buses.
    • Features: Immobilizer (transponder key), electronic throttle (rare), revised glow control.
    • Pinout Complexity: High. Swapping these ECUs is frustrating without the key, ring antenna, and immobilizer ECU.

Key Takeaway for Swappers: The 3-plug (A, B, C) 22-pin system from the KZN185 Surf (1996-2002) is the gold standard. We will focus heavily on this pinout.

Connector B (Sensor Inputs – 22 pins)

| Pin | Wire Color | Signal Name | Function | Voltage / Signal | | :--- | :--- | :--- | :--- | :--- | | B1 | Red/Blue | VTA1 | Throttle Position Sensor (TPS) Signal | 0.5V (Idle) – 4.5V (WOT) | | B2 | Black | E2 | TPS Sensor Ground | 0V | | B3 | Red/Yellow | VC | TPS Reference Voltage (5V output from ECU) | 5V | | B4 | N/A | N/C | Not Connected | - | | B5 | Green/White | THW | Engine Coolant Temp (ECT) Signal | 2.5V (Cold) → 0.3V (Hot) | | B6 | Red/Black | THA | Intake Air Temp (IAT) Signal | 3.0V (Cold) → 1.0V (Hot) | | B7 | Shield | E1 | Sensor Shield Ground (Crank/Cam signals) | 0V | | B8 | White | G2 | Crank Position Sensor – G2 (Ne/Ne+) | AC sine wave (1-5V during crank) | | B9 | Black | G- | Crank Position Sensor – G- (Ne-) | AC sine wave (inverse of G2) | | B10 | N/A | N/C | Not Connected | - | | B11 | N/A | N/C | Not Connected | - | | B12 | Yellow | STA | Starter Signal (crank sense) | 12V (While cranking only) | | B13 | Black/White | NSW | Neutral Start Switch (P/N signal) | 0V (In gear) / 12V (Park/Neutral) | | B14 | Brown/White | A/C1 | AC Switch Signal (to ECU) | 12V (AC ON) | | B15 | N/A | N/C | Not Connected | - | | B16 | Blue | SPD | Vehicle Speed Sensor (VSS) | Pulse (0-12V square wave) | | B17 | Black | E2 | Sensor Common Ground | 0V | | B18 | White/Green | G1 | Cam Position Sensor (G1 – Cylinder 1 TDC) | AC sine wave | | B19 | Red | G2e | Cam Position Sensor (G2 – Cylinder 4 TDC) | AC sine wave | | B20 | N/A | N/C | Not Connected | - | | B21 | N/A | N/C | Not Connected | - | | B22 | Light Green/Red | A/C2 | AC Compressor Clutch Feedback | 12V (Clutch engaged) |

2. The Fuel Control Loop (SCV vs. VCV)

People often confuse the Spill Control Valve (SCV) and the Timing Control Valve (VCV). 1kz ecu pinout

  • SCV (A8, A9): Controls how much fuel. Failure leads to surging idle or no acceleration.
  • VCV (A16, A17): Controls when the fuel is injected (timing). Failure leads to knocking or smoke.

Test: Unplug the SCV. The engine should default to a high idle (limp mode). If it dies instantly, your SCV wiring is shorted.

2. Common 1KZ-TE ECU Pinout Reference

Note: Wire colors and pin positions can vary based on the specific vehicle chassis (KZN185 vs KZN130, etc.). Always verify with a multimeter.

Below are the critical pins found on the most common 26-pin + 16-pin + 22-pin configurations (found in later model Prados/Surfs).

1. Engine Swap (e.g., into Hilux LN106 or Land Cruiser 70)

You need at minimum:

  • Power: +B (B1, B2 on main plug) – via EFI relay
  • Sensor ground: E2, E1
  • NE+ / NE- (crank sensor)
  • RSC (spill valve) and TCV (timing valve)
  • FSV (fuel shutoff) – gives 12V to pump
  • STA (starter signal)
  • SP1 (speed sensor) – or you'll get high idle

Part 7: Real-World Case Study – Intermittent Shutdown Solved by Pinout

Scenario: 1995 Toyota Hilux Surf (1KZ-TE) drives fine for 20 minutes, then dies. After cooling for 1 hour, it restarts.

Misdiagnosed as: Bad injection pump ($2,000 repair quote).

Actual problem found using 1KZ ECU pinout:

  • With engine hot, probe A2 (main relay power).
  • Voltage dropped to 7V when engine stalled.
  • Checked A3 ground wire – corrosion inside the connector.

Fix: Cleaned and re-pinned ground circuit. Cost: $0. Important: Know Your ECU Version Toyota used two

Lesson: Always start with the pinout. Never throw parts at a diesel ECU until you verify voltage, ground, and signal at the pins.

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