Applicable Systems
Mazda3
Mazda6
CX-5
CX-9
Symptoms
Variable valve timing actuator performance fault on Skyactiv-G engine; timing may retard for safety.
Possible Causes
- VVT oil control valve stuck open or closed
- VVT actuator mechanical failure
- Engine oil pressure supply to VVT insufficient
Troubleshooting Steps
- Step 1: Check VVT oil control valve operation
Valve moves freely when energized - Step 2: Inspect engine oil pressure
Oil pressure within spec at idle and 3000 RPM - Step 3: Replace VVT actuator assembly
Actuator replaced, timing verified with scan tool
How to Reset
Clear codes and perform VVT learning procedure.
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Source: SAE J2012 Standard, OBD-II Service Manuals
Category: OBD-II
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