LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Mazda >> 2003 >> MX-5 Miata Base, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P2402: EVAP System Leak Detection Pump Motor Circuit - High Input >> Diagnostic Procedure
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Diagnostic Procedure

  1. Verify Related Repair Information Availability -  Turn ignition off. Connect scan tool to DLC-2. See Figure. Turn ignition on, engine off. Monitor for FREEZE FRAME DATA and ensure data has been recorded. Check service bulletins for repair information related to this DTC. If repair information is not available, go to next step. If repair information is available, perform diagnosis and repair as necessary. After repair, go to next step.
  2. Verify Related Pending Code Or Stored DTCs -  Turn ignition off, then on (engine off). Verify related Pending Code or stored DTCs. If DTC P2406 is not present with P2402, go to next step. If DTC P2406 is present with P2402, go to DTC P2406: EVAP SYSTEM LEAK DETECTION PUMP ORIFICE CLOGGING .
  3. Check EVAP System Leak Detection Pump Circuit For Short To Power -  Turn ignition on. Disconnect EVAP system leak detection pump 4-pin harness connector. See Figure. Measure voltage between ground and EVAP system leak detection pump 4-pin harness connector terminal "D" (Yellow/Black wire). If battery voltage is not present, go to next step. If battery voltage is present, repair short circuit to power in Yellow/Black wire between EVAP system leak detection pump 4-pin harness connector terminal "D" and PCM 24-pin harness connector terminal "3K". See appropriate WIRING DIAGRAM under ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS. After repair, go to next step.
  4. Verify Troubleshooting Of DTC P2402 Completed -  Return vehicle to original condition. Connect scan tool to DLC-2. See Figure. Clear DTCs from PCM memory. See CLEARING DIAGNOSTIC TROUBLE CODES  under SELF-DIAGNOSTIC SYSTEM. Start engine and let idle until normal operating temperature is reached. Monitor for DTCs. If same DTC is not present, go to next step. If same DTC P2402 is present, replace PCM. For PCM removal and installation, see POWERTRAIN CONTROL MODULE under COMPUTERIZED ENGINE CONTROLS in REMOVAL, OVERHAUL & INSTALLATION article. After repair, go to next step.
  5. Verify After Repair Procedure -  Using scan tool, perform After Repair Procedure. See AFTER REPAIR PROCEDURE . If no other DTCs are present, testing is complete. If any other DTC is present, go to applicable test and repair.
scientia non olet · About LEMON Manuals