Toyota Yaris MK3 KSP90R ECU 1.0 i 998 cc Petrol 1KR-FE / 1KRFE 2011 - 2014 5 MTM 5 Door Hatchback KSP130R-CHMRKW

Toyota Yaris MK3 KSP90R FB18 T2 VVT-I 61 REG 68.4bph Engine Control Unit Ecu 89661-0DF10:0261S07104:0 261 S07 104:1324 0037:1039S52656:1KR-FE:896610DF10 :081013240037310512110257:8125223744 1.0 i 998 cc 1KR-FE / 1KRFE 5 Speed Manual KSP130R-CHMRKW 2011,2012,2013,2014 Petrol MK3 FA11 VVT-I T2 61 REG 70bph v14304-19254

Additional Info

Toyota Yaris MK2/MK3 (KSP90R/KSP130R) ECU – Engine Control Unit (ECU) – 1.0L 1KR-FE (2007-2014)

1. ECU Details & Specifications

• Part Name: Engine Control Unit (ECU)
• OEM Part Number:
  • 89661-0DF10
• Manufacturer Codes:
  • 0261S07104
  • 0 261 S07 104
  • 1324 0037
  • 1039S52656
• Condition: Used / Genuine OEM Component

2. Vehicle Compatibility

• Make & Model: Toyota Yaris MK2/MK3
• Trim Level: T2 VVT-i
• Engine: 1.0L 1KR-FE
• Displacement: 998 cc
• Power Output:
  • MK2: 68.4 BHP
  • MK3: 70 BHP
• Fuel Type: Petrol
• Transmission: 5-Speed Manual
• Chassis Code:
  • KSP90R (MK2)
  • KSP130R-CHMRKW (MK3)
• Year Range:
  • MK2: 2010, 2011
  • MK3: 2011, 2012, 2013, 2014
• Registration Compatibility: 10 Reg / 11 Reg

3. ECU Functions & Importance

The ECU (Engine Control Unit) is responsible for managing the following:

? Engine Management & Fuel Injection – Optimizes fuel delivery and ignition timing.
? Variable Valve Timing (VVT-i) Control – Adjusts valve timing for efficiency and performance.
? Emissions Control – Works with oxygen sensors to regulate emissions.
? Throttle Response & Acceleration – Monitors and controls throttle input.
? Diagnostics & Fault Storage – Stores error codes when issues occur.

4. Common ECU Fault Codes & Issues

A. Engine Performance & Fuel System Faults

? P0171 – System Too Lean (Bank 1)

• Cause: MAF sensor failure, vacuum leaks, or fuel injector problems.
• Solution: Clean/replace the MAF sensor, check for vacuum leaks.

? P0300 – Random/Multiple Cylinder Misfire

• Cause: Faulty ignition coil, spark plugs, or fuel delivery issues.
• Solution: Replace ignition coils, spark plugs, and inspect the fuel system.

? P0420 – Catalyst System Efficiency Below Threshold

• Cause: Malfunctioning catalytic converter or oxygen sensors.
• Solution: Check and replace the O2 sensors or catalytic converter.

? P0128 – Coolant Thermostat Below Regulating Temperature

• Cause: Stuck open thermostat or low coolant.
• Solution: Replace the thermostat, top up coolant.

B. ECU Communication & Electrical Faults

? U0100 – Lost Communication with ECM/PCM

• Cause: Wiring issues, battery voltage problems, or corroded connectors.
• Solution: Inspect wiring harness, reset ECU, check battery health.

? P0606 – ECM/PCM Processor Fault

• Cause: Internal ECU failure, software corruption, or power supply issues.
• Solution: Try resetting/reflashing the ECU, check grounding points.

? P2118 – Throttle Actuator Control Motor Current Range/Performance

• Cause: Faulty throttle body or wiring issue.
• Solution: Clean or replace the electronic throttle body.

5. ECU Installation & Fitment Guide

A. Installation Steps:

? Step 1: Disconnect the battery (negative terminal first).
? Step 2: Locate the ECU (usually under the dashboard, passenger side, or engine bay).
? Step 3: Disconnect the wiring harness connectors.
? Step 4: Remove the mounting bolts securing the ECU.
? Step 5: Install the replacement ECU, ensuring secure connections.
? Step 6: Reconnect the battery, turn the ignition ON, and check for error codes.

B. Precautions Before ECU Installation

? Ensure Compatibility: Verify the ECU part number (89661-0DF10) matches your old ECU.
? ECU Programming: Some units require reprogramming & immobilizer coding at a Toyota dealer.
? Avoid Power Surges: Disconnect the battery before replacing the ECU to prevent electrical damage.
? Check for Other Issues: If the old ECU was faulty due to sensor or wiring issues, fix them before installing the new ECU.

6. How to Clear ECU Fault Codes (OBD-II Reset Method)

? Method 1: Disconnect Battery Reset

1. Disconnect the negative terminal of the battery.
2. Press the brake pedal for 30 seconds (to drain residual power).
3. Reconnect the battery after 10-15 minutes.
4. Start the engine and check if the codes clear.

? Method 2: Using an OBD-II Scanner

1. Plug an OBD-II scanner into the diagnostic port (below the dashboard, driver's side).
2. Turn ignition ON (without starting the engine).
3. Select "Read Codes" and note any stored fault codes.
4. Select "Clear Codes" to erase them.
5. Start the car and verify if the Check Engine Light (CEL) stays off.

7. Why Choose a Genuine Toyota ECU?

? OEM Quality & Reliability – Engineered for Toyota Yaris MK2 & MK3.
? Perfect Fit & Functionality – Works with Toyota’s VVT-i engine system.
? Improved Performance & Efficiency – Optimized for fuel economy & smooth acceleration.

For further assistance, provide your VIN, part number, or fault codes to confirm fitment and troubleshooting steps. ??