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DI-492
DIAGNOSTICS - ENGINE (2UZ-FE)
DIDR7-01
CIRCUIT INSPECTION
DTC P0010 Camshaft Position "A" Actuator circuit
(Bank 1)
DTC P0020 Camshaft Position "A" Actuator circuit
(Bank 2)
CIRCUIT DESCRIPTION
The Variable Valve Timing (VVT) system includes the ECM, the Oil Control Valve (OCV) and the VVT control-
ler. The ECM sends a target "duty-cycle" control signal to the OCV. This control signal, applied to the OCV,
regulates the oil pressure supplied to the VVT controller. Camshaft timing control is performed based on en-
gine operation conditions such as intake air volume, throttle position and engine coolant temperature.
The ECM controls the OCV, based on the signals output from the sensors. The VVT controller regulates the
intake camshaft angle using oil pressure through the OCV. As a result, the relative position between the cam-
shaft and the crankshaft is optimized, and the engine torque improves, fuel economy improves, and exhaust
emissions decrease under overall driving conditions. Also, the ECM detects the actual valve timing using
signals from the camshaft position sensor and the crankshaft position sensor, and performs feedback con-
trol. This is how target valve timing is verified by the ECM.
ECM
Crankshaft Position Sensor
Camshaft Timing
Mass Air Flow Sensor Target Valve Timing Oil Control
Valve (OCV)
Throttle Position Sensor
Feedback
Duty Control
Engine Coolant Temp. Sensor
Correction
Vehicle Speed Signal
Camshaft Position Sensor Actual Valve Timing
A20891
DTC No. DTC Detecting Condition Trouble Area
S Open or short in OCV circuit
P0010
Open or short in OCV circuit S OCV
P0020
S ECM
DI-493
DIAGNOSTICS - ENGINE (2UZ-FE)
MONITOR DESCRIPTION
After the ECM sends the "target" duty-cycle signal to the OCV (Oil Control Valve), the ECM monitors the
OCV current to establish an "actual" duty-cycle. When the actual duty-cycle ratio varies from the target
duty-cycle, the ECM sets a DTC.
MONITOR STRATEGY
P0010 VVT oil control valve bank 1 range check
Related DTCs
R l t d DTC
P0020 VVT oil control valve bank 2 range check
Required sensors/components OCV
Frequency of operation Continuous
Duration 1 sec.
MIL operation Immediate
Sequence of operation None
TYPICAL ENABLING CONDITIONS
Specification
Item
It
Minimum Maximum
The monitor will run whenever this DTC
See page DI-437
not present
All of the following conditions are met -
Starter OFF
Ignition switch ON
Time after ignition switch OFF to ON 0.5 seconds -
TYPICAL MALFUNCTION THRESHOLDS
Detection Criteria Threshold
One of the following conditions is met: Condition A, B or C
A. All of the following conditions are met: Condition (a), (b) , and (c)
(a) Battery voltage 11 V or more, and less than 13 V
(b) Target duty ratio Less than 70 %
(c) Output signal duty ratio 100 % or more
B. All of the following conditions are met: Condition (a), (b) , and (c)
(a) Battery voltage 13 V or more
(b) Target duty ratio Less than 80 %
(c) Output signal duty ratio 100 % or more
C. Both of the following conditions are met: Condition (a) and (b)
(a) Current cut ststus Not cut
(b) Output signal duty ratio 3% or less
COMPONENT OPERATING RANGE
Parameter Standard Value
OCV current 3 to 100 %
DI-494
DIAGNOSTICS - ENGINE (2UZ-FE)
WIRING DIAGRAM
ECM
C19
OCV (Bank 1)
G-B 17
1
E5 OC1+
16
2 L-Y
E5 OC1-
C20
OCV (Bank 2)
15
1 P-L
E5 OC2+
14
2 W-R
E5 OC2-
A07621 A09776
INSPECTION PROCEDURE
HINT:
S If DTC P0010 displayed, check left bank OCV circuit.
S If DTC P0020 displayed, check right bank OCV circuit.
S Read freeze frame data using hand-held tester. Because freeze frame records the engine conditions
when the malfunction is detected. When troubleshooting, it is useful for determining whether the ve-
hicle was running or stopped, the engine was warmed up or not, the air-fuel ratio was lean or rich, etc.
at the time of the malfunction.
DI-495
DIAGNOSTICS - ENGINE (2UZ-FE)
1 Check OCV circuit.
PREPARATION:
(a) Connect the hand-held tester to the DLC3.
(b) Start the engine and warm it up.
(c) Turn the ignition switch to ON and turn the hand-held tester ON.
CHECK:
(a) Select the item: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / VVT CTRL B1 or VVT CTRL B2.
(b) Using the hand-held tester, operate the OCV and check the engine speed.
OK:
Standard:
Tester Operation Specified Condition
OCV is OFF Normal engine speed
OCV is ON Rough idle or engine stall
OK Check for intermittent problems
(See page DI-430).
NG
2 Check operation of OCV.
PREPARATION:
Battery - Battery + (a) Start the engine and warmed it up.
(b) Disconnect the OCV connector.
Valve (c) Apply battery positive voltage between the terminals of
the OCV.
CHECK:
Check the engine speed.
OK:
A31449 A23511 Rough idle or engine stalled.
NG Replace OCV.
OK
DI-496
DIAGNOSTICS - ENGINE (2UZ-FE)
3 Check voltage between terminals OC1+ and OC1-, OC2+ and OC2- of ECM con-
nector.
OCV Signal Waveform CHECK:
5 V/ (a) Inspection using the oscilloscope.
Division (b) During idling, check the waveform between the specified
(A) (A) (A) terminals of the E5 ECM connector.
HINT:
GND The waveform frequency (A) is lengthened as the engine speed
becomes higher.
OK:
1 msec./Division
A02397 Standard:
The correct waveform is as shown.
E5
E1
OC1+
OC1- OC2-
ECM Connector OC2+ B17414
NG Replace ECM (See page SF-82).
OK
DI-497
DIAGNOSTICS - ENGINE (2UZ-FE)
4 Check for open and short in harness and connector between OCV and ECM.
Wire Harness Side PREPARATION:
(a) Disconnect the C19 or C20 OCV connector.
(b) Disconnect the E5 ECM connector.
C19 CHECK:
(a) Check for resistance between the wire harness side con-
C20
nectors.
OK:
OCV Connector Standard (Check for open):
A23673 Symbols (Terminal No.) Specified condition
OCV (C19-1) - OC1+ (E5-17) Below 1
OCV (C19-2) - OC1- (E5-16) Below 1
E5 OCV (C20-1) - OC2+ (E5-15) Below 1
OCV (C20-2) - OC2- (E5-14) Below 1
Standard (Check for short):
Symbols (Terminal No.) Specified condition
E1
OCV (C19-1) or OC1+ (E5-17) - E1 (E5-1) 10 k or higher
OC1+ OCV (C19-1) or OC1- (E5-16) - E1 (E5-1) 10 k or higher
OC1- OC2- OCV (C20-1) or OC2+ (E5-15) - E1 (E5-1) 10 k or higher
ECM Connector OC2+ OCV (C20-1) or OC2- (E5-14) - E1 (E5-1) 10 k or higher
B17414
NG Repair or replace harness or connector.
OK
Check for intermittent problems
(See page DI-430).
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