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Home >> Mazda >> 2002 >> Tribute LX, 4WD >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0443: EVAP Canister Purge Solenoid - Malfunction >> Diagnostic Procedures

Diagnostic Procedures

NOTE: EVAP canister purge valve may also be referred to as EVAP vapor management valve.
  1. If QUICK TEST was not performed, go to QUICK TEST  under SELF-DIAGNOSTIC SYSTEM. If QUICK TEST was performed, fault that produced Continuous Memory DTC P0443 (without KOEO or KOER P0443) can be intermittent. Refer to INTERMITTENT  testing under SYSTEM TESTS . If fault is not intermittent, replace PCM. If KOEO or KOER P0443 is also present, go to next step.

  2. Check For VPWR To EVAP Canister Purge Solenoid

    Turn ignition off. Disconnect EVAP Canister Purge Valve (EVAPCPV) harness connector. Turn ignition on, engine off. Measure voltage between ground and VPWR (Red wire) at EVAPCPV harness connector. See Fig 1. If voltage reading is more than 10.5 volts, go to next step. If voltage reading is not as specified, repair open in Red wire between EVAPCPV harness connector and PCM 104-pin harness connector terminal No. 71. See WIRING DIAGRAMS article. After repair, go to step  7.
    NOTE: EVAP canister purge valve resistance reading must be taken with engine cooled down.
    Fig 1: Identifying EVAP Canister Purge Valve Circuits & Harness Connector Terminals
    G00159001Courtesy of MAZDA MOTORS CORP.

  3. Check EVAP Canister Purge Solenoid Resistance

    Turn ignition off. With EVAPCPV disconnected. Measure resistance between EVAPCPV and VPWR terminals at EVAPCPV. If resistance reading is 30-38 ohms, go to next step. If resistance reading is not as specified, replace EVAPCPV. After repair, go to step  7.

  4. Check Resistance Of EVAPCPV Circuit

    Disconnect PCM 104-pin harmess connector. Connect Breakout Box (49-UN01-130) to PCM harness connector only. See Figure. Measure resistance of EVAPCPV circuit between breakout box terminal No. 56 and EVAPCPV harness connector. If resistance reading is less than 5.0 ohms, go to next step. If resistance reading is not as specified, repair open in EVAPCPV circuit (Light Green/Black wire) between PCM 104-pin harness connector terminal No. 56 and EVAPCPV harness connector. After repair, go to step  7.

  5. Check EVAP Canister Purge Solenoid Circuit For Short To PWR GND

    Disconnect scan tool from DLC. Measure resistance between breakout box terminal No. 56 (EVAPCPV) and terminal No. 103 (PWR GND). Is resistance reading is more than 10,000 ohms, go to next step. If resistance reading is less than 10,000 ohms, repair short between EVAPCPV (Light Green/Black wire) and PWR GND (Black wire). See WIRING DIAGRAMS article. After repair, go to step  7.

  6. Check EVAPCPV Circuit For Short To VPWR

    Turn ignition on, engine off. Measure voltage between breakout box terminal No. 56 (EVAPCPV) and terminal No. 103 (PWR GND). If voltage reading is more than 10.5 volts, repair short to power between EVAPCPV (Light Green/Black wire) and VPWR (Red wire). After repair, go to next step. If voltage reading is not as specified, replace PCM. After repair, go to next step.

  7. Verify Trouble Shooting Of DTCs Completed

    Reconnect all disconnected connectors. Perform PCM Quick Test. If any DTC is present, go to applicable procedure for other DTCs. See DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no DTCs are set, trouble shooting is complete.
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