SFI SYSTEM(w/o Secondary Air Injection System), Diagnostic DTC:P0011, P0012, P0021, P0022

DTC Code	DTC Name
P0011	Camshaft Position "A" - Timing Over-Advanced or System Performance (Bank 1)
P0012	Camshaft Position "A" - Timing Over-Retarded (Bank 1)
P0021	Camshaft Position "A" - Timing Over-Advanced or System Performance (Bank 2)
P0022	Camshaft Position "A" - Timing Over-Retarded (Bank 2)

DESCRIPTION

The VVT system includes the ECM, Camshaft Oil Control Valve (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 intake 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 intake 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.

DTC Code	DTC Detection Condition	Trouble Area
P0011 P0021	The intake valve timing is not adjusted in the valve timing advance range (1 trip detection logic).	Valve timing Camshaft Oil Control Valve (OCV) (for intake side of Bank 1, 2) OCV filter Camshaft timing gear ECM
P0012 P0022	The intake valve timing is not adjusted in the valve timing retard range (2 trip detection logic).	Valve timing OCV (for intake side of Bank 1, 2) OCV filter Camshaft timing gear ECM

DTC Code

DTC Detection Condition

Trouble Area

P0011

P0021

The intake valve timing is not adjusted in the valve timing advance range (1 trip detection logic).

Valve timing
Camshaft Oil Control Valve (OCV) (for intake side of Bank 1, 2)
OCV filter
Camshaft timing gear
ECM

P0012

P0022

The intake valve timing is not adjusted in the valve timing retard range (2 trip detection logic).

Valve timing
OCV (for intake side of Bank 1, 2)
OCV filter
Camshaft timing gear
ECM

MONITOR DESCRIPTION

The ECM optimizes the intake valve timing using the VVT (Variable Valve Timing) system to control the intake camshaft. The VVT system includes the ECM, Camshaft Oil Control Valve (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. The VVT controller can advance or retard the intake camshaft.
If the difference between the target and actual intake valve timings is large, and changes in the actual intake valve timing are small, the ECM interprets this as the VVT controller stuck malfunction and stores DTC(s).

Example:
A DTC is stored when the following conditions 1 and 2 are met:

1. It takes 5 seconds or more to change the valve timing by 5°CA.
2. After the above condition 1 is met, the camshaft timing oil control valve is forcibly activated during 10 seconds.

DTC P0011 and P0021 (Advanced Cam Timing) are subject to 1 trip detection logic.
DTC P0012 and P0022 (Retarded Cam Timing) are subject to 2 trip detection logic.
These DTCs indicate that the VVT controller cannot operate properly due to OCV malfunctions or the presence of foreign objects in the OCV.
The monitor will run if all of the following conditions are met:

The engine is warm (the engine coolant temperature is 75°C [167°F] or higher).
The vehicle has been driven at more than 64 km/h (40 mph) for 3 minutes.
The engine has idled for 3 minutes.

WIRING DIAGRAM

Refer to DTC P0010 Click here.

CAUTION / NOTICE / HINT

Tech Tips

DTC P0011, P0012, P0021 or P0022 may be stored when foreign objects in the engine oil are caught in some parts of the system. The DTC will remain stored even if the system returns to normal after a short time. Foreign objects are filtered out by the oil filter.

Tech Tips

Abnormal Bank	Advanced Timing Over (Valve Timing is Out of Specified Range)	Retarded Timing Over (Valve Timing is Out of Specified Range)
Bank 1	P0011	P0012
Bank 2	P0021	P0022

Abnormal Bank

Advanced Timing Over

(Valve Timing is Out of Specified Range)

Retarded Timing Over

(Valve Timing is Out of Specified Range)

Bank 1

P0011

P0012

Bank 2

P0021

P0022

If DTC P0011 or P0012 is output, check the left bank VVT system for intake side circuit (for Bank 1).
Bank 1 refers to the bank that includes the No. 1 cylinder*.

*: The No. 1 cylinder is the cylinder which is farthest from the transmission.
If DTC P0021 or P0022 is output, check the right bank VVT system for intake side circuit (for Bank 2).
Bank 2 refers to the bank that does not include the No. 1 cylinder.
Read freeze frame data using the intelligent tester. Freeze frame data records the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data from the time the malfunction occurred.

PROCEDURE

CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0011, P0012, P0021 OR P0022)

Connect the intelligent tester to the DLC3.
Turn the engine switch on (IG) and turn the tester on.
Enter the following menus: Powertrain / Engine and ECT / DTC.

Read DTCs.

Result
Result	Proceed to
P0011, P0012, P0021 or P0022 is output	A
P0011, P0012, P0021 or P0022 and other DTCs are output	B

Tech Tips

If any DTCs other than P0011, P0012, P0021 or P0022 are output, troubleshoot those DTCs first.

GO TO DTC CHART Click here

PERFORM ACTIVE TEST USING INTELLIGENT TESTER (OPERATE OCV)

Connect the intelligent tester to the DLC3.
Start the engine.
Turn the tester on.
Warm up the engine.
Turn the A/C on.
Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the VVT Linear (Bank 1) or Control the VVT Linear (Bank 2).

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

Operation	Specified Condition
0%	Normal engine speed
100%	Engine idles roughly or stalls

Tech Tips

Refer to "Data List / Active Test" [VVT OCV Duty #1, VVT Change Angle #1, VVT OCV Duty #2 and VVT Change Angle #2] Click here.

CHECK VALVE TIMING (CHECK FOR LOOSE AND JUMPED TOOTH OF TIMING CHAIN) Click here

CHECK WHETHER DTC OUTPUT RECURS (DTC P0011, P0012, P0021 OR P0022)
1. Connect the intelligent tester to the DLC3.
2. Turn the engine switch on (IG) and turn the tester on.
3. Clear the DTCs Click here.
4. Start the engine and warm it up.
5. Switch the ECM from normal mode to check mode using the tester.
6. Drive the vehicle for more than 10 minutes.
7. Read DTCs using the tester.
  
  OK
  
  No DTC output.
OK
CHECK FOR INTERMITTENT PROBLEMS Click here

NG
CHECK VALVE TIMING (CHECK FOR LOOSE AND JUMPED TOOTH OF TIMING CHAIN)
*a Timing Mark
1. Remove the cylinder head cover LH and RH.
2. Turn the crankshaft pulley, and align its groove with the timing mark "0" of the timing chain cover.
3. Check that the timing marks of the camshaft timing gears and camshaft timing exhaust gears are at the positions shown in the illustration.
  
  OK
  
  Timing marks on camshaft timing gears are aligned as shown in the illustration.
NG
ADJUST VALVE TIMING Click here

OK

OK
No DTC output.

*a	Timing Mark

OK
Timing marks on camshaft timing gears are aligned as shown in the illustration.

INSPECT CAMSHAFT OIL CONTROL VALVE ASSEMBLY


*1	Component without harness connected: (Oil Control Valve)

Remove the OCV.


*1	Valve Moves

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

Standard Resistance

Tester Connection	Condition	Specified Condition
1 - 2	20°C (68°F)	6.9 to 7.9 Ω

Check the valve operation.

Measurement Condition	Specified Condition
No battery voltage applied to terminals 1 and 2 → Battery voltage applied to terminals 1 and 2	Valve moves quickly

REPLACE CAMSHAFT OIL CONTROL VALVE ASSEMBLY Click here

INSPECT OIL CONTROL VALVE FILTER
1. Remove the OCV filter Click here.
2. Check that the filter is not clogged.
  
  OK
  
  Filter is not clogged.
NG
CLEAN OIL CONTROL VALVE FILTER

OK
REPLACE INTAKE CAMSHAFT TIMING GEAR
1. Replace the intake camshaft timing gear Click here.
NEXT
CHECK WHETHER DTC OUTPUT RECURS
1. Connect the intelligent tester to the DLC3.
2. Turn the engine switch on (IG) and turn the tester on.
3. Clear the DTCs Click here.
4. Start the engine and warm it up.
5. Switch the ECM from normal mode to check mode using the tester.
6. Drive the vehicle for more than 10 minutes.
7. Read the output DTCs using the tester.
  
  OK
  
  No DTC is output.
  
  Tech Tips
  
  DTC P0011, P0012, P0021 or P0022 is output when foreign objects in the engine oil are caught in some parts of the system. These codes will stay stored even if the system returns to normal after a short time. These foreign objects are then captured by the oil filter, thus eliminating the source of the problem.
OK
SYSTEM OK

NG
REPLACE ECM Click here