P1656: Oil Control Valve Control System Malfunction
Short answer: P1656 means “Oil Control Valve Control System Malfunction”. Below is what it means on each of the 3 cars we cover, with a link to the full page for each car.
P1656 on each car
| Car | Meaning on this car | Confidence |
|---|---|---|
| Toyota Passo (1st gen) | Oil Control Valve Control System Malfunction (P1656/74) | high |
| Toyota Vitz (1st gen) | Oil control valve (OCV) circuit | medium |
| Toyota Corolla (9th gen, E120) | OCV CIRCUIT MALFUNCTION (P1656/39) | high |
| Toyota Corolla (9th gen, E120) | OCV CIRCUIT MALFUNCTION (P1656/39) | high |
Symptoms
- When, under a condition where the battery voltage is 12V or more, one of the following conditions is continued over a certain length of time
What to check, in order
- Is the control signal of the oil control valve outputted normally from the EFI ECU?
- Is the harness between the oil control valve and the EFI ECU normal?
Causes and checks above are the general meaning. The exact test steps and values differ by car: open your car’s page.