Operation CHARM: Car repair manuals for everyone.
Home >> Hyundai >> 2006 >> Azera V6-3.8L >> Repair and Diagnosis >> A L L Diagnostic Trouble Codes ( DTC ) >> Testing and Inspection >> P Code Charts >> P0026

P0026

DTC P0026






GENERAL DESCRIPTION
Different from the existing fixed cam phase angle type, CVVT(Continuously Variable Valve Timing) is the device which varies cam phase angle continuously to be optimum. And with engine oil pressure, it operates. CVVT consists of OCV(Oil Control Valve) and cam phaser. OCV, mounted on cylinder head, controls the amount and direction of oil delivered to cam phaser by oil valve which is connected to a solenoid. Cam phaser, rotating cam phaser rotor with pressure and amount of oil produced by OCV, rotates cam shaft forcefully for or against the rotating direction and finally, cam shaft phase changes. With the appliance of CVVT, engine power,fuel efficiency and the quality of exhaust gas are improved.





DTC DESCRIPTION
Small particles in the engine oil may cause the oil control valve to bind or otherwise get stuck at certain spool positions. A test is used in this diagnostic to detect a stuck valve spool. A cleaning function is then used to try and free the spool. If unsuccessful, the diagnostic test is failed.Figure 1. illustrates the principle of the valve stuck diagnostic test. As in the phaser error diagnostic illustration, there are two cases shown in the figure. The case on the left shows a case where the duty cycle is above a calibration threshold, yet the phaser position is near the minimum position. Under normal operation, such a duty cycle command would move the phaser toward its maximum position.The case on the right shows the opposite situation. The duty cycle command is below a threshold, yet the phaser position is near its maximum.

PCM monitors OCV stuck while cam offset is available and Valve cleaning is not in progress .If the PCM detects that CAM position angle is over 20 CAD(Crank Angle Degree) than expected cam position that PCM controls the OCV while cam position is in designated crank angle degree, PCM determines that a fault exists and a DTC is stored.

DTC Detecting Condition:




DTC DETECTING CONDITION

SPECIFICATION
Resistance (ohms): 6.7 - 7.7 ohms

Schematic Diagram:




SCHEMATIC DIAGRAM

Signal Waveform And Data:




SIGNAL WAVEFORM AND DATA

MONITOR SCANTOOL DATA
1. IG "OFF"& connect Scantool.
2. ENG "ON" and warm -up the engine to normal operating temperature.




3. Monitor "CAM(B1)" status on the service data.
4. Are the "CMP(B1)" data displayed correctly?

YES - Fault is intermittent caused by poor contact in the sensor's and/or PCM`s connector or was repaired and PCM memory was not cleared. Thoroughly check connectors for looseness, poor connection, ending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary and go to "Verification of Vehicle Repair" procedure

NO - Go to "Terminal and connector inspection" procedure

TERMINAL AND CONNECTOR INSPECTION
1. Many malfunctions in the electrical system are caused by poor harness 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 - Go to " Power Circuit Inspection " as follow

POWER CIRCUIT INSPECTION
1. IG "OFF" and disconnect OCV connector.
2. IG "ON"& ENG "OFF".




3. Measure voltage between terminal 1 of OCV harness connector and chassis ground.

Specification : B+

4. Is the measured voltage within specification?

YES - Go to " Control Circuit Inspection " procedure.

NO - Check that Fuse between Main Relay and OCV is open. Check open between main relay and OCV. Check short to ground between Main Relay and OCV. Repair or replace as necessary go to "Verification of Vehicle Repair " procedure.

CONTROL CIRCUIT INSPECTION
1. IG "OFF" and disconnect OCV connector.
2. IG "ON"& ENG "OFF".




3. Measure voltage between terminal 2 of OCV harness connector and chassis ground.

Specification : Approx. below 1 V

4. Is the measured voltage within specification?

YES - Go to "System Inspection" procedure.

NO - Repair or replace as necessary and then go to "Verification of Vehicle Repair" procedure.

SYSTEM INSPECTION
1. Visual Inspection
a. Check oil level is O.K.
b. Check oil is contaminated.
c. Check that any oil leakage is occurred around CVVT system.
d. Has a problem been found?

YES - Repair or replace as necessary and then, go to " Verification of Vehicle Repair" procedure.

NO - Go to "Component Inspection" procedure

COMPONENT INSPECTION
1. OCV Inspection
a. IG "OFF"& Disconnect OCV connector.




b. Measure resistance between terminal 1 and 2 of OCV connector (Component Side)

Specification :
Resistance (ohms): 6.7 - 7.7 ohms

c. Is the measured resistance within specification?

YES - Go to "Actuation Test" as follow.

NO - Substitute with a known - good OCV and check for proper operation. If the problem is corrected, replace OCV and go to "Verification of Vehicle Repair" procedure.

2. Actuation Test
a. IG "OFF" and connect OCV connector
b. IG "ON"& ENG "OFF"




c. Check that click sound can be heard when actuation operates with Scantool.
d. Does the OCV operate correctly when actuation operates?

YES - Substitute with a known - good PCM and check for proper operation. If the problem is corrected, replace PCM and go to "Verification of Vehicle Repair" procedure.

NOTE: There is a memory reset function on Scantool that can erase optional parts automatically detected and memorized by PCM.Before or after testing PCM on the vehicle, use this function to reuse the PCM on the others.

NO - Substitute with a known - good OCV and check for proper operation. If the problem is corrected, replace OCV 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. Monitor and record the Freeze Frame Data for the Diagnostic Trouble Code(DTC) which has been diagnosed.
2. Using a Scantool, Clear the DTCs
3. Operate the vehicle within conditions noted in the freeze frame data or enable conditions
4. Monitor that all readiness test have been verified as "Complete".
5. Are any DTCs present?

YES - Go to the applicable troubleshooting procedure.

NO - System is performing to specification at this time.
pro multis · About Operation CHARM