ECT Sensor No.1 Inspection

Disconnect the negative battery cable.
Drain the engine coolant. (See COOLING SYSTEM SERVICE WARNINGS .)
Remove the battery. (See BATTERY REMOVAL/INSTALLATION [MZR 1.5] .)
Disconnect the ECT sensor No.1 connector.
Remove the ECT sensor No.1. (See PCM CONFIGURATION .)
Place the ECT sensor No.1 in water with a thermometer, and heat the water gradually.
Measure the resistance between the ECT sensor No.1 terminals using an ohmmeter.

Fig 1: Identifying ECT Sensor No.1 Connector Terminals
- If not as specified, replace the ECT sensor No.1.
  (See PCM CONFIGURATION .)