Ocv circuit in toyota

code p 1656 refers to OCV control circuit malfunction , bank 1
the OCV is the oil control valve for the cam timing and is regulated by the ecm
it is used to advance /retard the valve timing
The ECm verifies the that the desired cam shaft angle has been obtained by monitoring the cam shaft position sensor or if the timing chain has excessive play
on the cam shaft there is a servo that is oil operated that changes the valve timing according to engine rpm
that could be the problem or wiring to that unit

Fault code P1656 on the Mahindra Scorpio points to a malfunctioning OCV control circuit. The OCV, i.e., the oil control valve, is to keep the cam shaft timing in place, and this is monitored by the ECM. The ECM does this by ensuring that the camshaft angle is correct by looking at the camshaft position sensor or the timing chain. The problem may have occurred because of a wiring issue.

Camshaft Position Actuator Circuit (Bank 1)

its a variable valve timing (VVT) code. You'll likely need to take it in for diagnosis.

Possible causes include: Faulty oil control valve(OCV), open or short in VVT circuit, damaged pcm, open or short in the OCV/solenoid valve

direct FSM
btw , the ecu never knows what is bad, only the test that failed
the tech, gets to do tests in FSM to find CAUSE.
verbatim
Trouble Code: P1663 (3.0L V6 VIN - Auto)
OCV Circuit Malfunction (bank 2) Trouble Code Conditions:
Open or short in oil control valve circuit
Possible Causes:

• Open or short in OCV circuit
• OCV
• ECM

open FSM read what to do next
or alldata.com

P1656 is an OCV fault OCV (oil control valve) i have attached a pdf file to help you http://caphector.com/atoyota/techinfo.toyota.com/ileaf/02toyrm/02toypdf/02rmsour/2002/02echorm/di/eg/cip1656.pdf

P0010 - "A" Camshaft Position Actuator Circuit (Bank 1)

A P0010 code refers to the VVT (variable valve timing) or VCT (variable camshaft timing) components and the car's PCM (powertrain control module). That consists of an oil control valve (OCV), also called a solenoid valve and other components. Basically the check engine light and associated P0010 trouble code means that the voltage in the circuit has fallen below a set limit for a specific amount of time (varies by make/model/engine).

Symptoms may include:
* Check Engine Light illuminated (Malfunction Indicator Lamp)
* Rough running
* other symptoms may also be present

Causes: A code P0010 may mean that one or more of the following has happened:
* Faulty oil control valve (OCV)
* Open or short in the VVT/VCT circuit
* Open or short in the OCV / solenoid valve
* Damaged computer (PCM)

Possible Solutions: Some recommended troubleshooting and repair steps are:
* Carefully inspect the Bank 1 VVT/VCT system circuit wiring and connectors, repair as required
* With a warm engine, test the operation of the OCV, replace/repair as needed


Hope this helps to solve it (remember to rate this answer).

OBD-II Trouble Code Technical Description
A P0020-023 code refers to the VVT (variable valve timing) or VCT (variable camshaft timing) components and the car's PCM (powertrain control module). That consists of an oil control valve (OCV), also called a solenoid valve and other components. Basically the check engine light and associated P0020-023 trouble code means that the voltage in the circuit has fallen below a set limit for a specific amount of time (varies by make/model/engine). Bank 2 is the side of the engine that doesn't contain cylinder #1.

Causes…
A code P0020-023 may mean that one or more of the following has happened:

• Faulty oil control valve (OCV)
• Open or short in the VVT/VCT circuit
• Open or short in the OCV / solenoid valve
• Damaged computer (PCM)

Possible Solutions
Some recommended troubleshooting and repair steps are:

• Carefully inspect the Bank 2 VVT/VCT system circuit wiring and connectors, repair as required
• With a warm engine, test the operation of the OCV, replace/repair as needed

code 0010--camshaft position actuator circuit bank 1-- check for a faulty oil control valve(ocv)** short in ocv/solenoid valve**open short v v t/vct circuit