GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Geo 🢒 1997 🢒 Prizm 🢒 Engine 🢒 Engine Controls - 1.8L 🢒 Oxygen Sensor Replacement

Removal Procedure

    Object Number: 1578847 Size: SH
  1. Relieve the fuel system pressure. Refer to Fuel Pressure Relief Procedure.
  2. Drain the engine coolant. Refer to Daring and Refilling the Cooling System.
  3. Remove the accelerator cable and the cruise control cable (if equipped) from air cleaner (ACL) assembly clip.
  4. Disconnect the intake air temperature (IAT) sensor electrical connector.

    5. Loosen the ACL hose clamp bolt on throttle body.

  5. Remove the 4 cap clips from the ACL.
  6. Remove the ACL hose and cap from the throttle body.
  7. Remove the 2 nuts and the accelerator cable from the cable bracket (1) and throttle lever.
  8. Remove the 2 nuts and the throttle valve cable from the cable bracket and throttle lever (automatic transaxle only).
  9. Remove the 2 bolts and accelerator cable bracket from the throttle body.
  10. Remove the 2 exhaust gas recirculation (EGR) vacuum hoses from the throttle body.
  11. Remove the one evaporative emissions (EVAP) vacuum hose from the throttle body.
  12. Remove the one throttle opener vacuum hose from the throttle body.
  13. Disconnect the TP sensor electrical connector.
  14. Disconnect the idle air control (IAC) valve electrical connector.
  15. Remove the 2 clamps and engine coolant hoses and air hose from IAC valve.
  16. Remove the 2 nuts, 2 bolts and the throttle body from the intake manifold.
  17. Remove the throttle body gasket from the throttle body.

Disassemble Procedure

    Object Number: 1578848 Size: SH
  1. Remove the 4 screws and the IAC (1) valve and the gasket from the throttle body.

    2. Object Number: 1578849 Size: SH
  2. Remove the 2 screws and the TP sensor (2) from the throttle body (1).
  3. Remove the 2 screws and the throttle opener from the throttle body.

Assemble Procedure

    Object Number: 1578849 Size: SH
  1. Install the throttle opener to throttle body (1); secure with 2 screws.
  2. Install the TP sensor (2) to the throttle body; secure with 2 screws.

    3. Object Number: 1578848 Size: SH
  3. Install the IAC (1) valve and the new gasket to the throttle body; secure with 4 screws.

Installation Procedure

    Object Number: 1578847 Size: SH
  1. Install a new throttle body gasket to throttle body.
  2. Install the throttle body to the intake manifold; secure with 2 nuts and 2 bolts.

    3. Tighten
    Tighten the throttle body nuts and bolts to 22 N·m (16 lb ft).

  3. Install the 2 engine coolant hoses and air hose to IAC valve; secure with 2 clamps.
  4. Connect the IAC valve electrical connector.
  5. Connect the TP sensor electrical connector.
  6. Connect the one EVAP vacuum hose to throttle body.
  7. Connect the one throttle opener vacuum hose to throttle body.
  8. Connect the 2 EGR vacuum hoses to throttle body.
  9. Install the accelerator cable bracket to throttle body; secure with 2 bolts.

    10. Tighten
    Tighten the accelerator cable bracket bolts to 11 N·m (97 lb in).

  10. Install the throttle valve cable to cable bracket and throttle lever; secure with 2 nuts (automatic transaxle only). Do not tighten fully. Refer to TV Cable Adjustment in Automatic Transaxle.
  11. Install the accelerator cable to cable bracket (1) and throttle lever; secure with 2 nuts.

    12. Tighten
    Tighten the accelerator cable adjusting nuts to 8 N·m (71 lb in).

  12. Install the ACL hose and cap to throttle body.
  13. Connect the 4 cap clips to the ACL.

    14. Tighten
    Tighten the ACL hose clamp bolt to 15 N·m (11 lb ft).

  14. Connect the IAT sensor electrical connector
  15. Install the accelerator cable and cruise control cable (If equipped) from ACL assembly clip.
  16. Refill the engine coolant. Refer to Draining and Filling the Cooling System.
  17. Connect the negative battery cable.

    18. Tighten
    Tighten the negative (-) battery cable-to-negative (-) battery terminal retainer to 15 N·m (11 lb ft.).

  18. Adjust TP sensor and throttle opener. Refer to Throttle Opener Idle Speed Adjustment.
  19. Turn the ignition switch to "ON" and momentarily connect a jumper between DLC terminals +B and Fp to pressurize the fuel system. Check for any fuel leaks.