P0015
2ZR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0014,P0015: Camshaft Position "B" - Timing Over-Advanced or System Performance (Bank 1)
DTC P0014 - Camshaft Position "B" - Timing Over-Advanced or System Performance (Bank 1)
DTC P0015 - Camshaft Position "B" - Timing Over-Retarded (Bank 1)
DESCRIPTION
The VVT (variable valve timing) system adjusts the exhaust valve timing to improve driveability. The engine oil pressure turns the VVT controller to adjust the valve timing.
The Camshaft Timing Oil Control Valve (OCV) is a solenoid valve and switches the engine oil line. The valve moves when the ECM applies 12 V to the solenoid. The ECM changes the energizing time to the solenoid (duty-cycle) in accordance with the camshaft position, crankshaft position, throttle position, etc.
MONITOR DESCRIPTION
The ECM optimizes the exhaust valve timing using the VVT (Variable Valve Timing) system to control the exhaust camshaft. The VVT system includes the ECM, the Camshaft Timing Oil Control Valve (OCV) and the VVT controller (camshaft timing gear assembly). 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.
If the difference between the target and actual exhaust valve timings is large, and changes in the actual exhaust valve timing are small, the ECM interprets this as the VVT controller stuck malfunction and sets a DTC.
- Example:
- A DTC is set when the following conditions 1, 2 and 3 are met:
1. The difference between the target and actual exhaust valve timing is more than 5°CA (Crankshaft Angle) and the condition continues for more than 4.5 seconds.
2. It takes 5 seconds or more to change the valve timing by 5°CA.
3. After above conditions 1 and 2 are met, the OCV is forcibly activated during 10 seconds.
- DTC P0014 (Advanced Cam Timing) is subject to 1 trip detection logic.
- DTC P0015 (Retarded Cam Timing) is 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 more).
- The vehicle has been driven at more than 64 km/h (40 mph) for 3 minutes.
- The engine has idled for 3 minutes.
MONITOR STRATEGY
TYPICAL ENABLING CONDITIONS
TYPICAL MALFUNCTION THRESHOLDS
Advanced camshaft timing:
Retarded camshaft timing:
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT: Read freeze frame data using a Techstream. Freeze frame data records the engine conditions 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
1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0014 OR P0015)
(a) Connect a Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the tester ON.
(d) Select the following menu items: Powertrain / Engine and ECT / Trouble Codes.
(e) Read DTCs.
Result:
HINT: If any DTCs other than P0014 or P0015 are output, troubleshoot those DTCs first.
B -- GO TO DTC CHART
A -- Continue to next step.
2. PERFORM ACTIVE TEST USING TECHSTREAM (OPERATE OCV)
(a) Connect a Techstream to the DLC3.
(b) Start the engine.
(c) Turn the tester ON.
(d) Turn the air conditioning switch to ON.
(e) Select the following menu items: Powertrain / Engine and ECT / Active Test / Control the VVT Exhaust Linear (Bank 1).
(f) Check the engine speed while operating the OCV (for exhaust camshaft) using the tester.
OK:
HINT: If the result is not acceptable, cool the engine and perform the Active Test again.
(g) Start the engine when the engine coolant temperature is 30 °C (86 °F) or less.
(h) Turn the tester ON.
(i) Turn the air conditioning switch to ON.
(j) Select the following menu items: Powertrain / Engine and ECT / Active Test / Control the VVT Exhaust Linear (Bank 1).
(k) Check the engine speed while operating the OCV (for exhaust camshaft) using the tester with the engine coolant temperature is 50 °C (122 °F) or less.
OK:
NG -- INSPECT CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY (FOR EXHAUST CAMSHAFT)
OK -- Continue to next step.
3. CHECK WHETHER DTC OUTPUT RECURS (DTC P0014 OR P0015)
(a) Connect a Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the tester ON.
(d) Clear DTCs DTC Check / Clear.
(e) Start the engine and warm it up.
(f) Switch the ECM from normal mode to check mode using the tester Check Mode Procedure.
(g) Allow the engine to idle for 3 minutes or more.
(h) Drive the vehicle for more than 10 minutes.
(i) Read DTCs.
Result:
B -- ADJUST VALVE TIMING
A -- CHECK FOR INTERMITTENT PROBLEMS
4. INSPECT CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY (FOR EXHAUST CAMSHAFT)
(a) Remove the OCV (for exhaust camshaft) Removal.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:
(c) Apply the positive battery voltage to terminal 1 and negative battery voltage to terminal 2. Check the valve operation.
OK:
Valve moves quickly.
(d) Reinstall the OCV (for exhaust camshaft) Installation.
NG -- REPLACE CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY (FOR EXHAUST CAMSHAFT)
OK -- Continue to next step.
5. INSPECT CAMSHAFT TIMING GEAR ASSEMBLY (FOR EXHAUST CAMSHAFT)
(a) Inspect the camshaft timing gear assembly (for exhaust camshaft) Engine Unit.
NG -- REPLACE CAMSHAFT TIMING GEAR ASSEMBLY (FOR EXHAUST CAMSHAFT)
OK -- Continue to next step.
6. INSPECT OIL CONTROL VALVE FILTER
(a) Remove the OCV filter Disassembly.
(b) Check that the filter is not clogged.
OK:
Filter is not clogged.
(c) Reinstall the OCV filter Reassembly.
NG -- CLEAN OIL CONTROL VALVE FILTER
OK -- Continue to next step.
7. ADJUST VALVE TIMING
HINT: There are no marks on the cylinder head to match-up for the purpose of checking valve timing. Valve timing can only be inspected by lining up the colored plates on the timing chain with the marks on the pulleys. It may be necessary to remove and re-install the chain to match up the alignment marks Reassembly.
NEXT -- Continue to next step.
8. CHECK WHETHER DTC OUTPUT RECURS (DTC P0014 OR P0015)
(a) Connect a Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the tester ON.
(d) Clear DTCs DTC Check / Clear.
(e) Start the engine and warm it up.
(f) Switch the ECM from normal mode to check mode using the tester Check Mode Procedure.
(g) Allow the engine to idle for 3 minutes or more.
(h) Drive the vehicle for more than 10 minutes.
(i) Read DTCs.
Result:
HINT: DTC P0014 or P0015 is output when foreign objects in engine oil are caught in some part of the system. These codes will stay output for a short time even after the system returns to normal. These foreign objects are then captured by the oil filter, thus eliminating the source of the problem.
B -- REPLACE ECM
A -- END