Toyota RAV4 manuals

Toyota Sienna Service Manual: Camshaft Position "B" Actuator Circuit

Camshaft Position "B" Actuator Circuit

DESCRIPTION

The Variable Valve Timing (VVT) system includes the ECM, OCV and VVT controller. The ECM sends a target duty-cycle control signal to the OCV. This control signal regulates the oil pressure supplied to the VVT controller. Camshaft timing control is performed according to engine operating conditions such as the intake air volume, throttle valve position and engine coolant temperature. The ECM controls the OCV, based on the signals transmitted by several sensors. The VVT controller regulates the exhaust camshaft angle using oil pressure through the OCV. As a result, the relative positions of the camshaft and crankshaft are optimized, the engine torque and fuel economy improve, and the exhaust emissions decrease under overall driving conditions. The ECM detects the actual exhaust valve timing using signals from the camshaft and crankshaft position sensors, and performs feedback control. This is how the target intake valve timing is verified by the ECM.

Camshaft Position "B" Actuator Circuit

Camshaft Position "B" Actuator Circuit

MONITOR DESCRIPTION

The ECM optimizes the valve timing using the VVT system to control the exhaust camshaft. The VVT system includes the ECM, the OCV and the VVT controller. The ECM sends a target duty-cycle control signal to the OCV. This control signal regulates the oil pressure supplied to the VVT controller. The VVT controller can advance or retard the exhaust camshaft.

After the ECM sends the target duty-cycle signal to the OCV, the ECM monitors the OCV current to establish an actual duty-cycle. The ECM determines the existence of a malfunction and sets the DTC when the actual duty-cycle ratio varies from the target duty-cycle ratio.

MONITOR STRATEGY

MONITOR STRATEGY

TYPICAL ENABLING CONDITIONS

TYPICAL ENABLING CONDITIONS

TYPICAL MALFUNCTION THRESHOLDS

TYPICAL MALFUNCTION THRESHOLDS

COMPONENT OPERATING RANGE

COMPONENT OPERATING RANGE

WIRING DIAGRAM

WIRING DIAGRAM

INSPECTION PROCEDURE

HINT:

1 PERFORM ACTIVE TEST BY INTELLIGENT TESTER (OPERATE OCV)

(a) Connect the intelligent tester to the DLC3.

(b) Start the engine and turn the tester on.

(c) Warm up the engine.

(d) Enter the following menus: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / VVT CTRL B1 or VVT CTRL B2.

(e) Check the engine speed while operating the Oil Control Valve (OCV) using the tester.

OK

CHECK FOR INTERMITTENT PROBLEMS

2 INSPECT CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY

INSPECT CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY

(a) Disconnect the C26 or C25 camshaft timing oil control valve (OCV) connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard resistance

(c) Reconnect the OCV connector.

REPLACE CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY (See page ES-486)

3 CHECK HARNESS AND CONNECTOR (OCV - ECM)

CHECK HARNESS AND CONNECTOR (OCV - ECM)

(a) Disconnect the C25 or C26 camshaft timing oil control valve (OCV) connector.

(b) Disconnect the E11 ECM connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard resistance (Check for open)

Standard resistance (Check for short)

(d) Reconnect the ECM connector.

(e) Reconnect the OCV connector.

REPLACE ECM (See page ES-498)

Camshaft Position "A" - Timing Over
HINT: If DTC P0011, P0012, P0021 or P0022 is present, check the VVT (Variable Valve Timing) system. DESCRIPTION Refer to DTC P0010 (See page ES-75). DTC No. DTC Detection Condition ...

Camshaft Position "B" - Timing Over
HINT: If DTC P0014, P0015, P0024 or P0025 is present, check the VVT (Variable Valve Timing) system. DESCRIPTION Refer to DTC P0013 (See page ES-87). MONITOR DESCRIPTION DTC P0014 and P0 ...

Other materials:

Access monitor result
(A) select the following menus on the intelligent tester: diagnosis, enhanced obdii, monitor info and monitor result. The monitor status appears after the component name. INCMP: The component has not been monitored yet. PASS: The component is functioning normally. FAIL: The component is ...

Inspection
1. INSPECT ENGINE COOLANT TEMPERATURE SENSOR  Using an ohmmeter, measure the resistance between the terminals. Standard resistance If the result is as specified, do not replace the engine coolant temperature sensor. If the result is not as specified, replace the engine ...

On-vehicle inspection
1. INSPECT OCCUPANT CLASSIFICATION ECU (VEHICLE NOT INVOLVED IN COLLISION)  Perform a diagnostic system check. 2. INSPECT OCCUPANT CLASSIFICATION ECU (VEHICLE INVOLVED IN COLLISION) Perform a diagnostic system check.  Even if the airbag was not deployed, check if there is ...

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