toyota Workshop Repair Guides

Toyota Workshop Service and Repair Manuals

Engine - MIL ON/DTC's P0171/P0300/P0133|Page 1316 > < Engine - MIL ON/DTC's P0171/P0300/P0133
Page 2
background image

Required Tools & Equipment

Inspection Procedure

NOTE:

The vehicle MUST be diagnosed following a cold soak. If the vehicle is at operating temperature, the condition will NOT be present.

1.

Monitor the following Data List parameter: Short FT # 1 (Short Term Fuel Trim for Bank 1).

Using TIS techstream, select:

Connect to Vehicle/Engine and ECT/Data List/Short FT # 1.

2.

Following conventional diagnostic procedure, confirm if there is a leak where the intake manifold and cylinder head meet between each intake
runner.

3.

Did the short term fuel trim change to a rich reading (negative fuel trim) in step 2?

^

If YES - Replace the intake manifold gasket.

^

If NO - Check for other vacuum leaks or lean running conditions per the Technical Information System (TIS).

Repair Procedure

1.

Drain the engine coolant. Refer to TIS:

^

2000, 2001, or 2002 model year Celica Repair Manual, Engine/Hybrid System - Cooling - "1ZZ-FE 2ZZ-GE: Coolant: Replacement"

^

2003, 2004, or 2005 model year Celica Repair Manual, Engine/Hybrid System - Cooling - "Coolant: Replacement"

2.

Remove the air cleaner assembly.

3.

Disconnect the accelerator cable.

4.

Remove the intake manifold.

Engine - MIL ON/DTC's P0171/P0300/P0133|Page 1316 > < Engine - MIL ON/DTC's P0171/P0300/P0133