P0076
DTC P0076 INTAKE VALVE CONTROL SOLENOID CIRCUIT LOW (BANK 1)Component Location:
GENERAL DESCRIPTION
The CVVT (Continuously Variable Valve Timing) system built on the camshaft helps the engine decrease the exhaust gas and increase engine power and fuel economy by changing the valve open/close timing of the intake camshaft continuously. The intake valve control solenoid, the main control part of the CVVT, changes the direction of the oil path through the CVVT by the duty control of the ECM and changes the open and close timing of the intake and exhaust valves.
DTC DESCRIPTION
ECM sets DTC P0076 if the ECM detects that the intake valve control solenoid control circuit is short to ground.
DTC Detecting Condition:
Specification:
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 : DTC occurred but has been cleared.
- Present fault : DTC is occurring 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.
POWER CIRCUIT INSPECTION
1. Ignition "ON" & Engine "OFF".
2. Measure voltage between terminal 2 of the oil control valve harness connector and chassis ground.
Specification : Approx. B+
3. Is voltage within specification?
YES - Go to "Control Circuit Inspection" procedure.
NO - Repair open or short to ground in the power supply circuit and go to "Verification of Vehicle Repair" procedure
CONTROL CIRCUIT INSPECTION
1. Measure voltage between terminal 1 of the oil control valve harness connector and chassis ground.
Specification : Approx. 3 - 4 V
NOTE: Signal waveform in control circuit with ignition ON & Engine OFF.
2. Is voltage within specification?
YES - Go to "Terminal and Connector Inspection" procedure.
NO - Repair short to ground in control circuit 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
COMPONENT INSPECTION
1. Ignition "OFF".
2. Disconnect oil control valve connector.
Specification:
3. Measure resistance between terminals 1 and 2 of the solenoid connector (Component side).
4. Is resistance within specification?
YES - Go to next step as below
NO - Check oil control valve for contamination, deterioration, or damage. Substitute with a known-good solenoid and Check for proper operation. If the problem is corrected, replace solenoid and then 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.