P1340 – VVT System Malfunction (Toyota)
Description
The ECM detected a malfunction in the variable valve timing system affecting camshaft timing accuracy.
Need More Than Just the Fault Code?
A diagnostic scanner with live data, freeze-frame information and the right system access can help you investigate the actual cause before replacing parts.
Compare Diagnostic ScannersSymptoms
- Rough idle
- Poor acceleration
- Engine hesitation
- Reduced power
- Check engine light on
Causes
- Faulty VVT oil control valve
- Low or dirty engine oil
- Clogged oil passages
- Camshaft timing issue
- ECM VVT control fault
Diagnosis
- Check oil level
- Inspect OCV operation
- Measure oil pressure
- Scan VVT data
- Check cam timing
Repair
- Replace OCV
- Change oil
- Clean oil passages
- Repair cam timing
- Replace ECM if needed
