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DTC P0443: EVAP Purge Solenoid Circuit: Testing

NOTE: EVAP purge solenoid may also be referred to as EVAP canister purge solenoid or duty cycle EVAP purge solenoid.
  1. Turn ignition on. Using scan tool, read DTCs. If GOOD TRIP counter is displayed for DTC P0443 and displayed count is "0", go to next step. If GOOD TRIP counter is not displayed for DTC P0443 or displayed count is not "0", go to step  7 .
  2. Ensure ignition is off. Disconnect EVAP purge solenoid connector. EVAP purge solenoid is mounted on a bracket at right rear of engine compartment. See Figure . Inspect connector for damaged pins, corrosion and loose terminals. Repair connector as necessary. If connector is okay, measure resistance between EVAP purge solenoid terminals. If resistance is 30-40 ohms, go to next step. If resistance is not 30-40 ohms, replace EVAP purge solenoid.
  3. Turn ignition on. Using a voltmeter, measure voltage between ground and White wire at EVAP purge solenoid harness connector. If voltage is more than 10 volts, go to next step. If voltage is 10 volts or less, check for open in White wire (fused ignition switch output circuit) between EVAP purge solenoid and junction block. Junction block is located behind passenger-side kick panel. Also check fuse No. 10 (15-amp) in junction block.
  4. Turn ignition off. Disconnect PCM connectors. PCM is located in engine compartment on left front fender, near radiator support. Inspect connectors for damaged pins, corrosion and loose terminals. Repair connectors as necessary. If connectors are okay, measure resistance of Pink/Black wire between EVAP purge solenoid harness connector and terminal No. 20 at PCM C3 harness connector. See Figure . If resistance is 5 ohms or more, repair open in Pink/Black wire between EVAP purge solenoid and PCM. If resistance is less than 5 ohms, go to next step.
  5. Measure resistance between ground and Pink/Black wire at EVAP purge solenoid wiring harness connector. If resistance is 5 ohms or more, go to next step. If resistance is less than 5 ohms, repair short to ground in Pink/Black wire between PCM and EVAP purge solenoid.
  6. At this time, PCM is assumed to be defective. Replace PCM.
  7. At this time, conditions for DTC to set do not exist or fault is an intermittent problem. Using scan tool, review FREEZE FRAME data. Attempt to duplicate condition that caused DTC to set. Visually inspect related connectors and wiring harness for damage. Check for any related technical service bulletins that may apply. Ensure ignition is on, with engine off. Using scan tool, read and then clear DTCs. Using scan tool, actuate EVAP purge solenoid. Wiggle wiring harness from EVAP purge solenoid to PCM. EVAP purge solenoid is mounted on a bracket at right rear of engine compartment. See Figure . PCM is located in engine compartment on left front fender, near radiator support. If EVAP purge solenoid DTC returns while wiggling wiring harness, repair wiring harness where wiggling caused DTC to return. If EVAP purge solenoid DTC does not return while wiggling wiring harness, no problem is indicated at this time. Test is complete.
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