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Home >> Mazda >> 2004 >> RX-8 1.3 3 >> Repair and Diagnosis >> External Pages >> Different car >> Section 66 (Engine Controls - Self-Diagnostics) >> Diagnostic Tests >> DTC P0443: EVAP Canister Purge Solenoid - Malfunction >> Diagnostic Procedures

Diagnostic Procedures

WARNING: This page is about a different car, the 2003 Mazda Tribute. However, it is still accessible from the selected car via links, so may be relevant.
    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) 2-pin harness connector. Turn ignition on, engine off. Measure voltage between ground and VPWR circuit (Light Blue/Orange 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 circuit between EVAPCPV harness connector (Light Blue/Orange wire) and PCM 104-pin harness connector terminal No. 71 (White/Red wire). See appropriate WIRING DIAGRAM under ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS. After repair, go to step  7.
    Fig 1: Identifying EVAP Canister Purge Valve Circuits & Harness Connector Terminals
    G00159001Courtesy of MAZDA MOTORS CORP.
    3. NOTE: EVAP canister purge valve resistance reading must be taken with engine cooled down.
  3. Check EVAP Canister Purge Solenoid Resistance -  Turn ignition off. With EVAPCPV disconnected. Measure resistance between EVAPCPV and VPWR terminals at EVAPCPV connector. 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 harness 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 (Light Green/Black wire). If resistance reading is less than 5 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). If 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 appropriate WIRING DIAGRAM under ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS. 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 (Light Blue/Orange 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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