LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Mazda >> 2001 >> MPV ES >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0443: EVAP System - Purge Control Valve Circuit Malfunction >> Testing
April 5, 2026: LEMON Manuals is launched! Read the announcement.

DTC P0443: EVAP System - Purge Control Valve Circuit Malfunction: Testing

NOTE: Check for service bulletins and on-line information.
  1. Turn ignition off. Turn ignition on. If DTC is not present, problem is intermittent. If DTC is present, go to next step.
  2. Disconnect intake manifold vacuum hose at purge solenoid valve. Apply vacuum at purge solenoid valve fitting. Wait a few seconds. If vacuum does not hold, go to next step. If vacuum holds, go to step  4 .
  3. Turn ignition off. Disconnect purge solenoid valve connector. Apply vacuum at purge solenoid valve fitting. If vacuum does not hold, replace purge solenoid valve. If vacuum holds for at least a few seconds, repair short to ground on Green/Black wire between purge solenoid valve harness connector terminal "B" and PCM harness connector terminal No. 18. See Figure . See WIRING DIAGRAMS article. Go to step  9 .
  4. Inspect purge solenoid valve harness connector. If problems are not present, go to next step. If any problems are present, repair as needed and go to step  9 .
  5. Measure resistance between terminals "A" and "B" on purge solenoid valve connector. If resistance is 22-26 ohms, go to next step. If resistance is not 22-26 ohms, replace purge solenoid valve and go to step  9 .
  6. Turn ignition on. Check voltage in White/Red wire between solenoid valve harness connector terminal "A" and ground. If battery voltage is present, go to next step. If battery voltage is not present, repair open or short in wire between purge solenoid valve and main relay. Go to step  9 .
  7. Turn ignition off. Disconnect PCM harness connector. PCM is mounted to passenger floor, behind glove box. Inspect connector and PCM terminals. If problems are not present, go to next step. If any problems are present, repair as needed. Go to step  9 .
  8. Reconnect solenoid valve connector. Connect a breakout box to PCM harness connector. Do not connect PCM. Turn ignition on. Check voltage between breakout box terminal No. 18 and ground. If battery voltage is present, go to next step. If battery voltage is not present, repair open in Green/Black wire between solenoid valve harness connector terminal "B" and PCM harness connector terminal No. 18. See WIRING DIAGRAMS article. Go to next step.
  9. Reconnect all components. Turn ignition off. Turn ignition on. If DTC is not present, go to next step. If DTC is present, replace PCM and go to next step.
  10. Perform after repair procedure. See AFTER REPAIR PROCEDURE  . If DTC is not present, testing is complete. If any DTC is present, go to appropriate test for diagnosis and repair.
scientia non olet · About LEMON Manuals