P1443low severityPowertrain
EVAP System Purge Flow Fault
on 1999 Mazda MX-5 Miata 1.8L I4 · RWD
What this code means
The PCM has detected insufficient or excessive purge flow in the Evaporative Emission Control System. The purge valve is not controlling fuel vapor flow from the charcoal canister to the intake manifold as expected.
Symptoms
- Check Engine Light
- Rough idle if purge valve stuck open
- Fuel odor
- Failed emissions test
Common causes
- Faulty purge solenoid valve stuck open or closed
- Cracked or blocked purge hoses
- Charcoal canister saturated or blocked
- Vacuum leak in EVAP system
- Purge valve wiring issue
Diagnostic steps
- Command purge valve open and closed with scan tool and verify flow
- Test purge solenoid resistance
- Inspect purge hoses for cracks or blockage
- Check charcoal canister condition
- Smoke test EVAP system
Repair notes
Replace the purge solenoid valve if it is stuck; repair damaged hoses.
Other Powertrain codes on this vehicle
P0001
Fuel Volume Regulator Control Circuit/Open
P0002
Fuel Volume Regulator Control Circuit Range/Performance
P0003
Fuel Volume Regulator Control Circuit Low
P0004
Fuel Volume Regulator Control Circuit High
P0010
Intake Camshaft Position Actuator Circuit/Open Bank 1
P0011
Intake Camshaft Position Timing Over-Advanced Bank 1
P0012
Intake Camshaft Position Timing Over-Retarded Bank 1
P0013
Exhaust Camshaft Position Actuator Circuit/Open Bank 1
P0014
Exhaust Camshaft Position Timing Over-Advanced Bank 1
P0015
Exhaust Camshaft Position Timing Over-Retarded Bank 1