U1001 (blink 85) on Toyota Passo (KGC10): Abnormal communication sending with EFI

Short answer: U1001 means “Abnormal communication sending with EFI”. The car’s computer has found a fault in the AT (4-speed, K3-VE E4A/T per spec table A1-3) system and turns on the Automatic gearbox warning light. First check: follow manual section procedure for this code.

Code

U1001 · blink 85

System

AT (4-speed, K3-VE E4A/T per spec table A1-3)

Dashboard light

Automatic gearbox warning light

Also sold as

Daihatsu Boon, Daihatsu Sirion (M300)

Applies to

M300/M301 export; JDM Boon/Passo 1st gen by platform

Confidence

high (factory chart); description parsing medium

Source

carmanualsclub.com

Symptoms and when it is set

1. Warning lamp per chart (see page)

Likely causes

1. Abnormal communication sending with EFI

What to check, in order

1. Follow manual section procedure for this code

Related on this car

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

← U0100/82 C0278/11 →

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.