Test Dg: Step 6

6) Test ECA With Substitute Knock Sensor  Turn key off and wait 10 seconds. Remove breakout box and reconnect ECA. Connect substitute knock sensor into harness but do not install sensor on engine. Substitute sensor should be a known good unit with the same part number. Ensure engine is at normal operating temperature. Perform KOER Self-Test. When DYNAMIC RESPONSE CHECK signal appears, lightly tap knock sensor with 4 oz. hammer. DO NOT  goose throttle. If Code 25 is displayed, replace ECA, reconnect original knock sensor and rerun QUICK TEST. Ignore all other codes at this time. If Code 25 does not appear, install new knock sensor and repeat QUICK TEST.