P1601 (blink 81) on Toyota Passo (KGC10): Immobilizer Signal Malfunction

Short answer: P1601 means “Immobilizer Signal Malfunction”. The car’s computer has found a fault in the Engine control (EFI) system and turns on the Check engine light (MIL). First check: open wire or short circuit for the immobilizer system circuit.

Code

P1601 · blink 81

System

Engine control (EFI)

Dashboard light

Check engine light (MIL)

Also sold as

Daihatsu Boon, Daihatsu Sirion (M300)

Applies to

1KR-FE: M300 (Sirion export = JDM Boon M300S/M301S(4WD? see gaps) & Passo KGC10/KGC15). JDM-spec ECU not separately documented | K3-VE: M301 (Sirion 1.3 = JDM Boon M310S? / Passo QNC10)

Confidence

high (factory manual, export spec)

Source

carmanualsclub.com

Symptoms and when it is set

1. When the engine starts, the rolling codes are not matched.

Likely causes

1. Open wire or short circuit for the immobilizer system circuit
2. Immobilizer ECU
3. EFI ECU

Related on this car

• All fault codes for this car
• Warning lights
• Where the parts are (parts map)
• Common problems

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Clearing the code does not fix the fault. If it comes back, the problem is still there. For brakes, airbags and steering, see a trained mechanic.