Evaporative Emission (EVAP) Canister Purge Solenoid Malfunction

DTC P0443 DETECTION CONDITION & POSSIBLE CAUSES

DTC P0443	EVAPORATIVE (EVAP) EMISSION CANISTER PURGE SOLENOID MALFUNCTION
DETECTION CONDITION	P0443 indicates the signal moved outside the minimum or maximum allowable calibrated parameters for a specified purge duty cycle by powertrain control module (PCM) command.
POSSIBLE CAUSE	VPWR circuit open EVAP canister purge valve circuit shorted to GND Damaged EVAP canister purge valve EVAP canister purge valve circuit open EVAP canister purge valve circuit shorted to VPWR Damaged PCM
HINT	See EVAP Vapor Management Flow System Monitor. See ENGINE OBD II MONITORS .
Courtesy of MAZDA MOTORS CORP.
Courtesy of MAZDA MOTORS CORP.

DTC P0443 DIAGNOSTIC PROCEDURE

DTC P0443		EVAPORATIVE (EVAP) EMISSION CANISTER PURGE SOLENOID MALFUNCTION
STEP	INSPECTION		ACTION
1	Was the PCM quick test performed?	Yes	The fault that produced continuous memory DTC P0443 (without KOEO or KOER P0443) can be intermittent. See GENERAL PINPOINT TEST 4: INTERMITTENT . Replace PCM after determining fault is not intermittent. See POWERTRAIN CONTROL MODULE (PCM) REMOVAL / INSTALLATION . If KOEO or KOER P0443 is also present, Go to next step.
1	Was the PCM quick test performed?	No	Perform PCM quick test. See PCM QUICK TEST .
2	CHECK FOR VPWR TO EVAP CANISTER PURGE VALVE Key OFF. Disconnect EVAP canister purge valve. Key on, engine off (KOEO). Measure voltage between VPWR at the EVAP canister purge valve harness connector and battery ground. Key OFF. Is voltage greater than 10.5 V?	Yes	Go to next step.
2		No	Repair open in VPWR harness. Go to step 7.
3	CHECK EVAP CANISTER PURGE SOLENOID RESISTANCE NOTE: EVAP canister purge valve resistance reading must be taken with engine cooled down. Measure resistance between EVAPCPV and VPWR on the EVAP canister purge valve. Is the resistance between 30 and 38 ohms?	Yes	Go to next step.
3		No	Replace evaporative (EVAP) emission canister purge valve. See CANISTER PURGE VALVE REMOVAL / INSTALLATION . Go to step 7.
4	CHECK RESISTANCE OF EVAPCPV CIRCUIT Disconnect PCM. Install breakout box, leave PCM disconnected. Measure resistance of EVAPCPV between PCM test pin 56 and the EVAP canister purge valve harness connector. Is the resistance less than 5.0 ohms?	Yes	Go to next step.
4		No	Repair open circuit. Go to step 7.
5	CHECK EVAP CANISTER PURGE VALVE CIRCUIT FOR SHORT TO PWR GND Disconnect scan tool. Measure the resistance between PCM test pin 56 (EVAP) and PCM test pin 103 (PWR GND). Is each resistance greater than 10K ohms?	Yes	Go to next step.
5		No	Repair short circuit. Go to step 7.
6	CHECK EVAPCPV CIRCUIT FOR SHORT TO VPWR Key on, engine off (KOEO). Measure voltage between PCM test pin 56 (EVAP) and PCM test pin 103 (PWR GND). Key OFF. Is the voltage greater than 10.5 V?	Yes	Repair short circuit. Go to next step.
6		No	Replace PCM. Shorted VPWR in the PCM. See POWERTRAIN CONTROL MODULE (PCM) REMOVAL / INSTALLATION . Go to next step.
7	VERIFY TROUBLESHOOTING OF DTCs COMPLETED Connect all disconnected connectors. Clear DTCs from PCM memory using WDS or equivalent tester. Perform PCM quick test. Is same DTC present?	Yes	Replace PCM. See POWERTRAIN CONTROL MODULE (PCM) REMOVAL / INSTALLATION . Repeat PCM quick test.
7		No	If any other DTC is present, Go to applicable DTC inspection. See DIAGNOSTIC TROUBLE CODE (DTC) INDEX - POWERTRAIN CONTROL MODULE (PCM) . If no DTC is present, troubleshooting is complete.