P1656 on Toyota Vitz (SCP10): Oil control valve (OCV) circuit

Short answer: P1656 means “Oil control valve (OCV) circuit”. The car’s computer has found a fault in the Engine - VVT system and turns on the Check engine light (MIL). First check: check OCV connector and wiring.

Code

P1656

System

Engine - VVT

Dashboard light

Check engine light (MIL)

Also sold as

Toyota Yaris, Toyota Echo (XP10)

Applies to

1SZ-FE (by platform)

Confidence

medium (Toyota Echo 1999–2002 factory diagnostics, same XP10 platform; not confirmed on JDM 1SZ-FE)

Source

carmanualsclub.com

Likely causes

1. Open or short in OCV circuit
2. Oil control valve
3. Engine computer (ECM)

What to check, in order

1. Check OCV connector and wiring
2. Check OCV resistance

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

• P1656 · Toyota Passo (1st gen)
• P1656 · Toyota Corolla (9th gen, E120)
• P1656 on all cars compared

← P1349 P1520 →

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.