P0024

Component Location





General Description

The CVVT (Continuously Variable Valve Timing) system is installed to the chain sprocket of the intake camshaft. This system controls the intake camshaft to provide the optimal valve timing for every driving condition. The ECM controls the Oil Control Valve(OCV), based on the signals output from mass air flow, throttle position and engine coolant temperature. The CVVT controller regulates the intake camshaft angle using oil pressure through the OCV. As result, the relative position between the camshaft and the crankshaft becomes optimal, and the engine torque improves, fuel economy improves, exhaust emissions decrease under over all driving conditions.

DTC Description

ECM detects CAM phasing average rate while cam signal is normally generating.
ECM determines that a fault exists and a DTC is stored while vehicle is tip - in and out driving for 5 minutes.

DTC Detecting Condition





Specification





Diagnostic Circuit Diagram





Signal Waveform & Data




















Fig.1) Normal waveform of CKPS & EX-CMPS at idle.
Fig.2) Normal waveform of CKPS & EX-CMPS at acceleration.
Fig.3) Normal data of EX-CVVT at idle.
Fig.4) Normal data of EX-CVVT at acceleration.
Fig.5) Normal graph of EX-CVVT at acceleration.

This example shows a typical Crankshaft Position Sensor (CKPS) and Camshaft Position Sensor (CMPS) waveform at idle.(Fig1.) If the 17th signal of the CKPS after missing tooth is aligned with the high signal of the CMPS at idle, ECM recognizes that Synchronization between CKPS and CMPS is completed. Under accelerating condition, the number of teeth between missing tooth and tooth aligned with edge of the CMPS high signal is increased from idle condition.(Fig2.)

Monitor Scantool Data

1. Connect scantool to Data Link Connector(DLC).
2. IG "ON".
3. Select "DTC" button, and then Press "DTC Status" to check DTC's information from the DTCs menu.
4. Read "DTC Status" parameter.




5. Is parameter displayed "Present fault"?�






System Inspection

Visual Inspection
1. Check oil level is O.K.
2. Check oil and OCV is contaminated.
3. Check for oil leakage around OCV
4. Has a problem been found ?






Component Inspection

Check OCV resistance
1. IG "OFF" and disconnect OCV connector.
2. Measure resistance between power and signal terminals of OCV. (Component Side)

Specification :6.7 - 7.7 Ohms


3. Is the measured resistance within specification ?





Check CAM PHASER with actuation test
1. connect scantool and IG "ON"
2. Select "CAM PHASER EXHAUST BANK 2" on the Actuation Test
3. Select "OIL CONTROL VALVE" on the Actuation Test
4. Activates "CAM PHASER EXHAUST BANK 2" by pressing "START" button
5. Activates "OIL CONTROL VALVE" by pressing "START" button
6. Repeat this procedure 4 or 5 times to ensure CAM PHASER and valve control solenoid reliability








7. Has a problem been found ?






Verification of Vehicle Repair

After a repair, it is essential to verify that the fault has been corrected.
1. Connect scantool and select "DTC" button.
2. Press "DTC Status" button and confirm that "DTC Readiness Flag" indicates "Completed". 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"?