Spark Retard Solenoid Check (6 Cyl.)

Remove vacuum gauge from canister purge hose and reconnect hose. Remove filter from spark retard solenoid and connect vacuum gauge to port. Turn engine off, then restart it and increase RPM to initiate Self-Test. If gauge pulses 3 times, system and MCU are okay. If vacuum remains high or low go to test 17, Spark Retard Solenoid test.