Engine Control unit 

Not limmited to these part numbers however include

89661-3D100

175800-1313

Toyota 1KZ ECU Repair Service
Common Overdrive & Starting Faults

This is a repair service for Toyota 1KZ engine ECUs, which are known to fail with issues such as:

• Overdrive not engaging

• Intermittent or complete no-start conditions

These failures are typically caused by aged or leaking electrolytic capacitors, which damage the PCB over time.

Our Repair Process Includes:

• Chemical removal of conformal coating using a controlled hot bath

• Desoldering and replacement of all electrolytic capacitors with equal or higher-spec components

• Track repair and restoration where corrosion or leakage has caused damage

• Re-coating the ECU with a clear, protective conformal layer

• Oven bake curing for long-term durability

• Full reassembly and bench testing

This process restores the ECU’s reliability and avoids the cost and complexity of replacement or reprogramming.

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