2004-2007 Honda Aquatrax ARX1200N3/T3/T3D Factory Service Manual, Page 208Get this manual
FUEL SYSTEM (Programmed Fuel Injection) DTC 7-1 (ECT SENSOR LOW VOLTAGE) 1ECT Sensor System Inspection Fit the safety lanyard clip to the base of the engine stop switchCheck the ECT sensor with the HDSIs about indicated? YES NO GO TO STEP Intermittent failure
2ECT Sensor Inspection Pull the safety lanyard clip off of the engine stop switchDisconnect the ECT sensor 2P blue connectorFit the safety lanyard clip to the base of the engine stop switchCheck the ECT sensor with the HDSIs about indicated? YES NO GO TO STEP Faulty ECT sensorECT SENSOR 2P CONNECTOR
3ECT Sensor Output Line Short Circuit Inspection Pull the safety lanyard clip off of the engine stop switchDisconnect the ECM 26P black connectorCheck for continuity between the wire harness side ECT sensor connector terminal and groundConnection: Pink Ground Is there continuity? YES NO Short circuit in the Pink wire Replace the ECM with new one, and recheckPink ECT SENSOR 2P BLUE CONNECTOR (viewed from the terminal side)