Retrieving Diagnostic Trouble Codes

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2002 Toyota RAV4, 2002 Toyota Highlander, 2002 Toyota Camry, 2002 Lexus RX 300, and 2001 Toyota RAV4. However, it is still accessible from the selected car via links, so may be relevant.

On all models, DTCs are a 4-digit code. See DIAGNOSTIC TROUBLE CODE DEFINITIONS table. DTCs can only be retrieved using Toyota or Lexus scan tool or On-Board Diagnostic (OBD-II) scan tool that complies with SAE standard J-1978. Connect scan tool to 16-pin Data Link Connector (DLC3). See Fig 1. DLC3 is located under instrument panel, near steering column. See Fig 2. When DTCs are present, MIL on instrument panel will illuminate. To retrieve DTCs using scan tool, follow scan tool manufacturer's operating instructions.

If no DTCs exist, perform manual shift test to determine if problem area is in electrical circuits or a mechanical transaxle problem. See MANUAL SHIFT TEST under PERFORMANCE TESTS.

NOTE: When using Toyota or Lexus scan tool, when ignition is turned from ON to ACC or OFF position or scan tool is switched from NORMAL mode to CHECK mode, all DTCs and freeze-frame data will be erased. DO NOT switch modes until all DTCs and freeze-frame data are recorded.

NOTE: Aftermarket scan tool may be operated in NORMAL mode when retrieving DTCs. Only Toyota or Lexus scan tool can be used in CHECK mode when retrieving DTCs.

NORMAL mode is used to retrieve DTCs from ECT ECU. CHECK mode is used to check for DTCs when operating vehicle to simulate conditions in which DTC was set. CHECK mode contains a higher sensing ability to detect malfunctions. CHECK mode helps determine malfunctions caused by poor electrical connections, which are difficult to determine using NORMAL mode.

NOTE: Once repairs have been performed, DTCs must be cleared from ECM memory. See CLEARING DIAGNOSTIC TROUBLE CODES .

Fig 1: Identifying Data Link Connector Terminals

Fig 2: Connecting Scan Tool To Data Link Connector