P0016
DTC P0016 CRANKSHAFT POSITION-CAMSHAFT POSITION CORRELATION (BANK 1 SENSOR A)Component Location:
GENERAL DESCRIPTION
The CVVT (Continuously Variable Valve Timing) system is installed to the chain sprocket of the exhaust camshaft. There is no variation in valve timing of the exhaust cam because the exhaust camshaft is driven by the timing belt. The timing of the intake cam is varied by the relative operation the CVVT vane to the housing. The CVVT controller regulates the intake camshaft angle using oil pressure through the OCV (Oil Control Valve). As result, the relative position between the camshaft and the crankshaft becomes optimal, and the engine torque improves, fuel economy improves, exhaust emissions decrease by changing the valve open/close timing of the intake camshaft.
DTC DESCRIPTION
This diagnosis Checks the camshaft position plausibility whether the expected range plus some margin is not violated that might be caused by a wrong engine repair, or a chain/belt misalignment. DTC P0016 is set when actual camshaft position is too much retarded or advanced than full retard position or full advance position. To continue the adjustment in such case could lead to a damage of the engine by hitting the valves with the piston.
DTC Detecting Condition:
Schematic Diagram:
Signal Waveform And Data:
MONITOR DTC STATUS
1. Connect scan tool and select "Diagnostic Trouble Codes (DTCs)" mode.
2. Press F4 (DTAL) to select DTC information from the DTCs menu.
3. Confirm that "DTC Readiness Flag" indicates "Complete". If not, drive the vehicle within conditions noted in the freeze frame data or enable conditions.
4. Read "DTC Status" parameter.
5. Is parameter displayed "History (Not Present) fault"?
NOTE:
- History (Not Present) fault 0: DTC occurred but has been cleared.
- Present fault : DTC is occuring at present time
YES - Fault is intermittent caused by poor contact in the sensor's and/or ECM's connector or was repaired and ECM memory was not cleared. Thoroughly Check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary and then go to "Verification of Vehicle Repair" procedure.
NO - Go to next step as below.
COMPONENT INSPECTION
1. Timing Inspection
1. With ignition "OFF", Set up an oscilloscope as follows :
Channel A (+): terminal 2 of the CKPS, (-): ground
Channel B (+): terminal 2 of the CMPS, (-): ground
2. Start the engine and Check for signal waveform whether synchronize with camshaft sensor or not and tooth is missing refer to sample waveforms as below
3. Is the signal waveform normal?
YES - Check for poor connection between ECM and component: backed out terminal, improper mating, broken locks or poor terminal to wire connection. Repair as necessary and go to "Verification of Vehicle Repair" procedure
NO - Check that the crankshaft and camshaft are correctly aligned the matching marks of the pulleys for the followings.
- Alignment of the timing belt
- Alignment of the camshaft timing chain
Readjust or repair as necessary and go to "Verification of Vehicle Repair" procedure
CHECK OCV AND FILTER
1. Check operation of OCV
1. Ignition "OFF".
2. Disconnect intake OCV connector.
3. Start the engine and let it idle.
Specification:
4. With OCV connector still disconnected, connect 12 V and a ground to 2 and 1 of the OCV (Component side).
5. Has a problem been found?
YES - Go to next step as below
NO - Go to "Check CVVT (Continuously Variable Valve Timing) Assembly" procedure
2. Check OCV and Filter
1. Ignition "OFF".
2. Check OCV filter for sticking or contamination.
3. Remove the OCV and visually Check the spool column of OCV for contamination
4. Has a problem been found?
YES - Clean or replace as necessary and then go to "Verification of Vehicle Repair" procedure
NO - Go to next step as below
5. Apply 12 V and a ground to 2 and 1 terminals of the OCV (Component side).
6. Verify that a "clicking" sound is heard when applying the battery voltage.
7. Repeat this procedure 4 or 5 times to ensure intake OCV reliability.
8. Is OCV working properly?
YES - Go to next step as below
NO - Check OCV for contamination, deterioration, or damage. Substitute with a known-good OCV and Check for proper operation. If the problem is corrected, replace OCV and then go to "Verification of Vehicle Repair" procedure
CHECK CVVT (CONTINU0USLY VARIABLE VALVE TIMING) ASSEMBLY
1. Remove the CVVT assembly. Refer to "Removal Procedure" in Workshop Manual
2. Check that the CVVT assembly is locked.
3. The one of the 2 holes on the cam journal is for advances (upper) and the rest is for retards (lower). Apply masking tape to all oil path holes except the one advance hole ("B") indicated by the arrow as shown in the figure.
4. To release the CVVT lock pin, wrap some tape around the tip of an air pressure adapter and apply low air pressure of approx. 150 kPa (1.5 kg/sq.cm, 21 psi) to the exposed camshaft port. Wrap a shop towel or rag around the CVVT because residual oil may leak out of the unit when applying air pressure.
5. With low air pressure applied, turn the CVVT to the ADVANCE direction as indicated in the figure.
NOTE: If too much air leaks when applying the low air pressure, the CVVT lock pin may not release and the CVVT may not turn.
6. Allow the CVVT assembly to move in the ADVANCE and DELAY directions to ensure there is no binding and that it moves freely. (Movable smoothly in the range about 20")
7. Turn the CVVT by hand and make sure it locks in the maximum delay angle position.
8. Is CVVT assembly working properly?
YES - Go to next step as below
NO - Replace the CVVT assembly and go to "Verification of Vehicle Repair" procedure
TERMINAL AND CONNECTOR INSPECTION
1. Many malfunctions in the electrical system are caused by poor harness(es) and terminals. Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage.
2. Thoroughly Check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.
3. Has a problem been found?
YES - Repair as necessary and go to "Verification of Vehicle Repair" procedure
NO - Check for poor connection between ECM and component: backed out terminal, improper mating, broken locks or poor terminal to wire connection. Repair as necessary and go to "Verification of Vehicle Repair" procedure
VERIFICATION OF VEHICLE REPAIR
After a repair, it is essential to verify that the fault has been corrected.
1. Connect scan tool and select "Diagnostic Trouble Codes (DTCs)" mode.
2. Press F4 (DTAL) and confirm that "DTC Readiness Flag" indicates "Complete". If not, drive the vehicle within conditions noted in the freeze frame data or enable conditions.
3. Read "DTC Status" parameter.
4. Is parameter displayed "History (Not Present) fault"?
YES - System performing to specification at this time. Clear the DTC
NO - Go to the applicable troubleshooting procedure.