P1656 (blink 39) on Toyota Corolla E120: OCV CIRCUIT MALFUNCTION

Short answer: P1656 means “OCV CIRCUIT MALFUNCTION”. The car’s computer has found a fault in the EFI 1NZ-FE/2NZ-FE system and turns on the Malfunction indicator lamp (Check Engine). First check: workshop check order (RM821E): INSPECT CAMSHAFT TIMING OIL CONTROL VALVE ASSY -> INSPECT ECU -> CHECK HARNESS AND CONNECTOR(ENGINE ECU−OCV).

Code

P1656 · blink 39

System

EFI 1NZ-FE/2NZ-FE

Dashboard light

Malfunction indicator lamp (Check Engine)

Applies to

2NZ-FE 1.3 (PK XLi/GLi NZE120) and 1NZ-FE 1.5 (JDM NZE121/NZE124 Corolla/Fielder/Runx)

Market note

UNLEADED GASOLINE ONLY

Confidence

high (official Toyota RM821E)

Source

toyotamanuals.gitlab.io

Symptoms and when it is set

1. Open or short in oil control valve circuit

Likely causes

1. Open or short in oil control valve circuit; Oil control valve; Engine ECU

What to check, in order

1. Workshop check order (RM821E): INSPECT CAMSHAFT TIMING OIL CONTROL VALVE ASSY -> INSPECT ECU -> CHECK HARNESS AND CONNECTOR(ENGINE ECU−OCV)

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 Vitz (1st gen)
• P1656 on all cars compared

← P1349/59 P0100/31 →

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.