C1278 (blink 88) on Toyota Passo (KGC10): Test mode: RL sensor interval

Short answer: C1278 means “Test mode: RL sensor interval”. The car’s computer has found a fault in the ABS (test mode only) system and turns on the ABS warning light. First check: drive straight 4-7 km/h (electrical) or 10-40 km/h for >=5 s (interval) to clear.

Code

C1278 · blink 88

System

ABS (test mode only)

Dashboard light

ABS warning light

Also sold as

Daihatsu Boon, Daihatsu Sirion (M300)

Applies to

M300/M301 export

Confidence

high

Source

carmanualsclub.com

Symptoms and when it is set

1. Only in sensor test mode

Likely causes

1. Test mode: RL sensor interval

What to check, in order

1. Drive straight 4-7 km/h (electrical) or 10-40 km/h for >=5 s (interval) to clear

Related on this car

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

Same code on other cars

• C1278 · Toyota Corolla (9th gen, E120)
• C1278 on all cars compared

← C1277/87 P0010 →

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.