P0018

2GR-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 sets the DTC.

- The VVT learned value: Less than 18.5° CA, or more than 43.5° CA.

- The above condition continues for 18 seconds or more.

This DTC indicates that the intake camshaft has been installed toward the crankshaft at an incorrect angle, 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. Clear the DTCs (even if no DTCs are stored, perform the clear DTC operation) [A].

2. Start the engine and warm it up until the ECT reaches 75°C (167°F) or higher [B].

3. Idle the engine for 5 minutes or more [C].

4. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.

5. Input the DTC: P0016 or P0018.

6. Check the DTC judgment result [D].

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].

7. Drive the vehicle for 2 to 3 minutes [E].

8. Idle the engine for 5 minutes or more [F].

9. Check the DTC judgment result [G].

10. If the test result is UNKNOWN, enter the following menus: Powertrain / Engine and ECT / Trouble Code / Pending.

11. Read Pending DTCs [G].

HINT
If a pending DTC is output, the system is malfunctioning.

12. If the test result is INCOMPLETE or UNKNOWN and no pending DTC is output, perform a universal trip and check for permanent DTCs DTC Check / Clear.

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.

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.

PROCEDURE

1. CHECK 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 tester on.

(c) Select the following menu items: 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
A -- Continue to next step.

2. PERFORM ACTIVE TEST USING TECHSTREAM (OPERATE OIL CONTROL VALVE FOR INTAKE CAMSHAFT)

(a) Connect the Techstream to the DLC3.

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

(c) Warm up the engine.

(d) Select the following menu items: Powertrain / Engine and ECT / Active Test / Control the VVT System (Bank 1) or Control the VVT System (Bank 2).

(e) Check the engine speed while operating the oil control valve using the tester.

OK:

NG -- CHECK VALVE TIMING (CHECK FOR LOOSE AND JUMPED TEETH ON TIMING CHAIN)
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 tester on.

(c) Clear the DTCs DTC Check / Clear.

(d) Start the engine and warm it up.

(e) Switch the ECM from normal mode to check mode using the tester Check Mode Procedure.

(f) Drive the vehicle in accordance with the driving pattern described in the CONFIRMATION DRIVING PATTERN.

(g) Read the DTCs using the tester.

OK:

No DTC output.

NG -- CHECK VALVE TIMING (CHECK FOR LOOSE AND JUMPED TEETH ON TIMING CHAIN)

OK -- END

4. CHECK VALVE TIMING (CHECK FOR LOOSE AND JUMPED TEETH ON TIMING CHAIN)

(a) Remove the cylinder head cover RH and LH.

(b) Turn the crankshaft pulley, and align its groove with the timing mark "0" 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.

(d) Reinstall the cylinder head cover RH and LH.

NG -- ADJUST VALVE TIMING
OK -- Continue to next step.

5. INSPECT CAM TIMING OIL CONTROL VALVE ASSEMBLY (FOR INTAKE CAMSHAFT)

(a) Remove the intake camshaft timing oil control valve.

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

Standard resistance:

OK:

Valve moves quickly.

(d) Reinstall the camshaft timing oil control valve.

NG -- REPLACE CAM TIMING OIL CONTROL VALVE ASSEMBLY
OK -- Continue to next step.

6. CHECK OIL PIPE AND OIL CONTROL VALVE FILTER

(a) Remove the oil pipe No. 1 or No. 2.

(b) Remove the OCV filter.

(c) Check that the filter and pipe are not clogged.

OK:

The filter and pipe are not clogged.

(d) Reinstall the OCV filter.

(e) Reinstall the oil pipe No. 1 or No. 2.

NG -- REPLACE OIL PIPE AND OIL CONTROL VALVE FILTER
OK -- Continue to next step.

7. REPLACE CAMSHAFT TIMING GEAR ASSEMBLY

NEXT -- Continue to next step.

8. CHECK WHETHER DTC OUTPUT RECURS

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON and turn the tester on.

(c) Clear the DTCs DTC Check / Clear.

(d) Start the engine and warm it up.

(e) Switch the ECM from normal mode to check mode using the tester Check Mode Procedure.

(f) Drive the vehicle for more than 10 minutes.

(g) Confirm that no DTC is set using the tester.

OK:

No DTC output.

HINT
DTC P0016 or P0018 is output when foreign objects in the engine oil are caught in some parts of the system. These codes will stay output 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

OK -- END