This is likely not the most recent version. Click here for the current page without highlighting.
This is Google's cache of www.westecauto.com/TechInfo/getcodes/lexus.html.
To show your matches, we have used the snapshot of this page that we took as we crawled the web.

Google is not affiliated with the authors of cached pages or their content.

WesTech Technical Information - Lexus Code Retrieval
Tech Vision
Diagnostic Code Retrieval
Home
Forums
Tech Info
Support
Links
Code Retrieval
Diagnostic Codes

Lexus Code Retrieval

Accessing Diagnostic Trouble Codes

The check engine warning light will come on when the ignition switch is turned On and the engine is not running. When the engine is started, the check engine warning light should go off. If light remains on, the self-diagnosis system has detected a mat-function or abnormality in the system. Access trouble codes as follows:

  1. Certain conditions must be met before accessing codes, they are as follows: Battery voltage must be 11 volts or more. Throttle valve must be fully closed. Transmission must be in Neutral position. All accessories must be turned Off.
  2. On models less OBD II, turn ignition to On, then use a jumper wire to connect terminals TE1 and El of the data link connector, located under the left hand side of the instrument panel. Codes are indicated by the number of flashes of the check engine warning light. On models with OBD II, prepare scan tool to SAE J 1978, then connect to data link connector (DLC) No. 3 in fuse panel on instrument panel lower left-hand side. Turn ignition and scan tool to On, and write down any codes and "freeze-frame data" that appear.

Diagnostic Trouble Code Interpretation

Normal system operation. Engine light will alternately blink On and Off two times per second. If the ECU has detected a system malfunction, the check engine light will blink every .5 second. The first number of blinks will equal the first digit of a two digit diagnostic trouble code and after a 1.5 second pause, the second number of blinks will equal the second digit of same diagnostic trouble code. If there are two or more DTC's, there will be a 2.5 second pause between each. After all DTC's have been output there will be a 4.5 second pause and all DTC's will be repeated as long as the terminals TE1 and El of the data link connector are connected. In the event of two or more DTC's, indication will begin from smaller numbered code and continue in order to the larger. After all DTC have been recorded, remove jumper wire.

Clearing Diagnostic Trouble Codes

After service, the diagnostic trouble code or DTC's retained in the ECU memory must be cleared by remove the EFI fuse for approximately 10 seconds or more, depending on ambient temperature (the lower the temperature, the longer the fuse must be left out) with the ignition switch off. The OBD II scan tool has a feature to clear DTC's. Refer to the manufacturer's manual for procedures. DTC cancellation can also be done by removing the battery ground cable, but keep in mind that other memory systems (clock) will also be cancelled out. If the diagnostic trouble code is not cancelled out, it will be retained by the ECU and appear along with a new DTC in the event of future trouble. If it is necessary to work on engine components requiring removal of the battery ground cable, ensure no DTC's are stored. After cancellation, road test the vehicle to check that a normal operating code is now obtained on the check engine warning light. If the same diagnostic trouble code appears, the trouble has not been corrected thoroughly.


© Copyright 1997-2000, WesTech Automotive Technical Excellence