DTC P0443: EVAP System Purge Control Valve Circuit Low Input

Turn ignition on. Using voltmeter connected to ground, backprobe ECM connector B134 (35-pin connector) terminal No. 2. See Figure. If voltage is 10 volts or less, go to next step. If voltage is more than 10 volts, system has returned to normal. Check for poor connection at ECM or purge control valve.
Turn ignition off. Disconnect purge control solenoid connector and ECM connector B134 (35-pin connector). Using an ohmmeter, measure resistance between ground and purge control solenoid connector terminal No. 2. See Figure. If resistance is more than 10 ohms, go to next step. If resistance is less than 10 ohms, check for short in wiring between ECM connector and purge control solenoid connector. See appropriate wiring diagram in WIRING DIAGRAMS article.
Measure resistance between ECM connector B134 (35-pin connector) terminal No. 2 and purge control solenoid connector terminal No. 2. If resistance is less than one ohm, go to next step. If resistance is more than one ohm, check for an open in wiring between ECM and purge control solenoid connectors.
Remove purge control solenoid. Measure resistance between purge control solenoid terminals. See Figure. If resistance is 10-100 ohms, go to next step. If resistance is less than 10 ohms or more than 100 ohms, replace purge control solenoid.
Turn ignition on. Check voltage between purge control solenoid connector terminal No. 1 and ground. If voltage is more than 10 volts, confirm there is a good connection at purge control solenoid connector. If connection is okay, replace ECM. If voltage is 10 volts or less, check for an open in wiring between main relay and purge control solenoid connectors. If okay, check for poor contact at main relay connector.