GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2005 🢒 Optra 🢒 Engine 🢒 Engine Controls - 2.0L (L34 GMDAT) 🢒 Engine Coolant Temperature Sensor Replacement

Removal Procedure


    Object Number: 1256151 Size: SH
  1. Relieve the coolant system pressure.

    2. Caution: Refer to Battery Disconnect Caution in the Preface section.

  2. Disconnect the negative battery cable.

    3. Notice: Use care when handling the coolant sensor. Damage to the coolant sensor will affect the operation of the fuel control system.

  3. Disconnect the engine coolant temperature (ECT) sensor connector.
  4. Remove the ECT sensor from the electronic ignition (EI) system ignition coil adapter.

Installation Procedure

    Object Number: 1256152 Size: SH
  1. Coat the threads of the ECT sensor with sealer.

    2. Notice: Refer to Fastener Notice in the Preface section.

  2. Install the ECT sensor into the EI system ignition coil adapter.

    3. Tighten
    Tighten the engine coolant temperature sensor to 20 N·m (15 lb ft).

  3. Connect the ECT sensor connector.
  4. Fill the coolant system.
  5. Connect the negative battery cable.