What are the possible causes of DTC P1321?
NOTE: The listed causes may not be a complete list of all potential problems, and there may be other causes.
- Low engine oil level
- Contaminated engine oil
- Incorrect oil filter
- Insufficient oil pressure due to mechanical failure of the lubrication system
- Faulty Variable Valve Actuator (VVA) assembly
How to repair DTC P1321?
Check the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins. Look for P1321 questions and answers:
What are the possible symptoms of code P1321?
- Engine light on (or engine maintenance warning light soon)
What does code P1321 mean?
Multi-Air is an electronically controlled variable intake valve timing and lift system. Unlike conventional variable intake valve timing and lift systems that control all cylinder intake valves simultaneously and in the same proportion; Multi-Air, through the use of an electronically controlled hydraulic link between the camshaft and the intake valve, allows each intake valve to be controlled independently. Valve lift and timing can be continuously adjusted.
The Multi-Air valve system features a mechanical camshaft lobe acting on a hydraulic pump located between the camshaft intake lobe and the intake valve. The pump supplies pressurized oil to a two-way electro-hydraulic valve called the Variable Valve Actuator (VVA) solenoid. The VVA solenoid is electronically controlled during the specific intake cam lobe event by the Powertrain Control Module (PCM). During the event, the VVA solenoid is commanded to either maintain oil pressure or to bleed off oil. The VVA solenoid is a normally open solenoid. The PCM provides 12 volts to close the solenoid. The position of the VVA solenoid determines the intake valve timing and lift. This change in valve action is similar to creating a change in the camshaft lobe profile affecting valve lift and opening duration.
The Diagnostic Trouble Code (DTC) will be set when the PCM measures the time required to energize the VVA solenoid. When the PCM determines that the VVA solenoid activation time cannot be measured, a fault is set.