P0018
1GR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0016, P0018: Crankshaft Position - Camshaft Position Correlation (Bank 1 Sensor A)
DESCRIPTION
Refer to DTC P0335 P0335.
MONITOR DESCRIPTION
The ECM optimizes the valve timing by using the VVT (Variable Valve Timing) system to control the intake camshaft. The VVT system includes the ECM, camshaft timing oil control valve and VVT controller.
The ECM sends a target duty-cycle control signal to the camshaft timing oil control valve. This control signal regulates the oil pressure applied to the VVT controller. The VVT controller can advance or retard the intake camshaft. The ECM calibrates the intake valve timing by setting the intake camshaft to the most retarded angle while the engine is idling. The ECM closes the camshaft timing oil control valve to retard the cam. The ECM stores this value as the VVT learned value. When the difference between the target and actual intake valve timing is 5°CA (Crankshaft Angle) or less, the ECM stores it.
If the VVT learned value matches the following conditions, the ECM determines the existence of a malfunction in the VVT system and stores the DTC.
- The VVT learned value is less than 0°CA, or more than 120°CA.
- The above condition continues for 18 seconds or more.
This DTC indicates that the intake camshaft is installed at an incorrect angle toward the crankshaft, caused by factors such as the timing chain having jumped a tooth.
This monitor begins to run after the engine has idled for 5 minutes.
MONITOR STRATEGY
TYPICAL ENABLING CONDITIONS
All
TYPICAL MALFUNCTION THRESHOLDS
CONFIRMATION DRIVING PATTERN
1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to ON and turn the Techstream on.
3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC operation).
4. Turn the ignition switch off and wait for at least 30 seconds.
5. Turn the ignition switch to ON and turn the Techstream on [A].
6. Start the engine and warm it up until the ECT reaches 75°C (167°F) or higher [B].
7. Idle the engine for 5 minutes or more [C].
8. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [D].
9. Read the pending DTCs.
HINT
* If a pending DTC is output, the system is malfunctioning.
* If a pending DTC is not output, perform the following procedure.
10. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
11. Input the DTC: P0016 or P0018.
12. Check the DTC judgment result.
CAUTION:
When performing the confirmation driving pattern, obey all speed limits and traffic laws.
HINT
* If the judgment result shows ABNORMAL, the system has a malfunction.
* If the judgment result shows INCOMPLETE or UNKNOWN, perform steps [E] through [G].
13. Drive the vehicle for 2 to 3 minutes [E].
14. Idle the engine for 5 minutes or more [F].
15. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [G].
16. Read the pending DTCs.
HINT
* If a pending DTC is output, the system is malfunctioning.
* If a pending DTC is not output, perform the following procedure.
17. Check the DTC judgment result.
18. If the test result is INCOMPLETE or UNKNOWN and no pending DTC is output, perform a universal trip and check for permanent DTCs Reading and Clearing Diagnostic Trouble Codes.
HINT
* If a permanent DTC is output, the system is malfunctioning.
* If no permanent DTC is output, the system is normal.
WIRING DIAGRAM
Refer to DTC P0335 P0335.
Refer to DTC P0340 P0340.
INSPECTION PROCEDURE
HINT
* Read freeze frame data using the Techstream. 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.
* 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.
* Bank 2 refers to the bank that does not include the No. 1 cylinder.
PROCEDURE
1. CHECK FOR ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0016 OR P0018)
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON and turn the Techstream on.
(c) Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
(d) Read the DTCs.
Result
HINT
If any DTCs other than P0016 or P0018 are output, troubleshoot those DTCs first.
B -- GO TO DTC CHART SFI System
A -- Continue to next step.
2. PERFORM ACTIVE TEST USING TECHSTREAM (OPERATE CAMSHAFT TIMING OIL CONTROL VALVE FOR INTAKE SIDE)
(a) Connect the Techstream to the DLC3.
(b) Start the engine and turn the Techstream on.
(c) Warm up the engine.
(d) Turn the A/C on.
(e) Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the VVT Linear (Bank 1) or Control the VVT Linear (Bank 2).
(f) Perform the Active Test. Check that the displacement angle varies.
OK:
Displacement angle varies.
NG -- CHECK VALVE TIMING (CHECK FOR LOOSE TEETH AND WHETHER TIMING CHAIN HAS JUMPED TOOTH)
OK -- Continue to next step.
3. CHECK WHETHER DTC OUTPUT RECURS (DTC P0016 OR P0018)
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON and turn the Techstream on.
(c) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.
(d) Start the engine and warm it up.
(e) Switch the ECM from normal mode to check mode using the Techstream Check Mode Procedure.
(f) Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.
(g) Read the DTCs using the Techstream.
OK:
No DTC output.
NG -- CHECK VALVE TIMING (CHECK FOR LOOSE TEETH AND WHETHER TIMING CHAIN HAS JUMPED TOOTH)
OK -- END
4. CHECK VALVE TIMING (CHECK FOR LOOSE TEETH AND WHETHER TIMING CHAIN HAS JUMPED TOOTH)
(a) Remove the cylinder head cover RH and LH.
Text in Illustration
(b) Turn the crankshaft pulley and align its groove with the "0" timing mark on the timing chain cover.
(c) Check that the timing marks on the camshaft timing gears are aligned with the timing marks of the bearing cap as shown in the illustration.
If not, turn the crankshaft 1 revolution (360°), and then align the marks as above.
OK:
Timing marks on camshaft timing gears are aligned as shown in the illustration.
NG -- ADJUST VALVE TIMING Installation
OK -- Continue to next step.
5. INSPECT CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY (FOR INTAKE SIDE)
(a) Inspect the camshaft timing oil control valve assembly Inspection.
NG -- REPLACE CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY Removal
OK -- Continue to next step.
6. CHECK OIL PIPE AND OIL CONTROL VALVE FILTER
(a) Remove the No. 1 or No. 2 oil pipe.
Text in Illustration
(b) Remove the oil control valve filter.
(c) Check that the filter and pipe are not clogged.
OK:
The filter and pipe are not clogged.
NG -- REPLACE OIL PIPE AND OIL CONTROL VALVE FILTER Disassembly
OK -- Continue to next step.
7. REPLACE CAMSHAFT TIMING GEAR ASSEMBLY
(a) Replace the camshaft timing gear assembly Removal.
NEXT -- Continue to next step.
8. CHECK WHETHER DTC OUTPUT RECURS (DTC P0016 OR P0018)
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON and turn the Techstream on.
(c) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.
(d) Start the engine and warm it up.
(e) Switch the ECM from normal mode to check mode using the Techstream Check Mode Procedure.
(f) Drive the vehicle for more than 10 minutes.
(g) Confirm that no DTC is output using the Techstream.
OK:
No DTC output.
HINT
DTC P0016 or P0018 is stored 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.
NG -- REPLACE ECM Removal
OK -- END