Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Toyota Sienna 1998-2003 Approved FSM 05 eg cip01711
<< Back | HomeMost service manuals and schematics are PDF files, so You will need Adobre Acrobat Reader to view : Acrobat Download Some of the files are DjVu format. Readers and resources available here : DjVu Resources
For the compressed files, most common are zip and rar. Please, extract files with Your favorite compression software ( WinZip, WinRAR ... ) before viewing. If a document has multiple parts, You should download all, before extracting.
Good luck. Repair on Your own risk. Make sure You know what You are doing.
Image preview - the first page of the document
>> Download cip01711 documenatation <<
Text preview - extract from the document
DI-52
DIAGNOSTICS - ENGINE
DI4F3-03
DTC P0171 System too Lean (Fuel Trim) (Bank 1)
DTC P0172 System too Rich (Fuel Trim) (Bank 1)
DTC P0174 System too Lean (Fuel Trim) (Bank 2)
DTC P0175 System too Rich (Fuel Trim) (Bank 2)
CIRCUIT DESCRIPTION
Fuel trim refers to the feedback compensation value compared against the basic injection time. Fuel trim
includes short-term fuel trim and long-term fuel trim.
Short-term fuel trim is the short-term fuel compensation used to maintain the air-fuel ratio at its ideal
theoretical value.
The signal from the A/F sensor is approximately proportional to the existing air-fuel ratio, and ECM compar-
ing it with the ideal theoretical value, the ECM reduces fuel volume immediately if the air-fuel ratio is rich
and increases fuel volume if it is lean.
Long-term fuel trim compensates the deviation from the central value of the short-term fuel trim stored up
by each engine tolerance, and the deviation from the central value due to the passage of time and changes
of using environment.
If both the short-term fuel trim and long-term fuel trim exceed a certain value, it is detected as a malfunction
and the MIL lights up.
DTC No. DTC Detecting Condition Trouble Area
S Gas leakage on exhaust system
S Air intake (hose loose)
When air fuel ratio feedback is stable after engine warming up, S Fuel line pressure
P0171
fuel trim is considerably in error on RICH side S Injector blockage
P0174
(2 trip detection logic) S Mass air flow meter
S Engine coolant temp. sensor
S A/F sensors (bank 1, 2 sensor 1)
S Gas leakage on exhaust system
S Fuel line pressure
When air fuel ratio feedback is stable after engine warming up,
P0172 S Injector leak, blockage
fuel trim is considerably in error on LEAN side
P0175 S Mass air flow meter
(2 trip detection logic)
S Engine coolant temp. sensor
S A/F sensors (bank 1, 2 sensor 1)
HINT:
S When the DTC P0171 or P0174 is recorded, the actual air-fuel ratio is on the lean side. When DTC
P0172 or P0175 is recorded, the actual air-fuel ratio is on the rich side.
S If the vehicle runs out of fuel, the air-fuel ratio is lean and DTC P0171 or P0174 is recorded. The MIL
then comes on.
S If the total of the short-term fuel trim value and long-term fuel trim value is within ◦ Jabse Service Manual Search 2026 ◦ Jabse Pravopis ◦ onTap.bg ◦ Other service manual resources online : Fixya ◦ eServiceinfo