Retrieving Diagnostic Trouble Codes

WARNING: This page is about a different car, the 2002 Toyota Avalon. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: Diagnostic Trouble Codes (DTC) may be retrieved using Toyota hand-held tester or On-Board Diagnostic (OBD-II) scan tool that complies with SAE standard J-1978. If using Toyota hand-held tester in CHECK mode, if ignition switch is turned from ON to ACC or OFF position, or tester is switched from CHECK mode to NORMAL mode, or from NORMAL mode to CHECK mode, all DTCs will be erased from Engine Control Module (ECM) memory. DO NOT switch modes until all DTCs are recorded.

Connect Toyota hand-held tester or scan tool to data link connector No. 3. See Figure. Turn ignition on with engine off. Turn hand-held tester or scan tool on. Using hand-held tester or scan tool manufacturer's instructions, check for DTCs.

If hand-held tester or scan tool does not display UNABLE TO CONNECT TO VEHICLE, go to next step. If hand-held tester or scan tool displays UNABLE TO CONNECT TO VEHICLE, try hand-held tester or scan tool on another vehicle. If hand-held tester or scan tool does not operate on another vehicle, problem is probably with hand-held tester or scan tool. If hand-held tester or scan tool operates on another vehicle, check voltage and resistance between ground and specified terminal on data link connector No. 3. See DATA LINK CONNECTOR NO. 3 VOLTAGE & RESISTANCE SPECIFICATIONS table. See Fig 1. If voltage or resistance is not within specification, check wiring to data link connector No. 3. See COMPUTER DATA LINES in SYSTEM WIRING DIAGRAMS article.

DATA LINK CONNECTOR NO. 3 VOLTAGE & RESISTANCE SPECIFICATIONS

Terminal No. (Circuit)

Specification

4 (Chassis Ground)

1 Ohm Or Less

7 (BUS Communication)

⁽¹⁾

16 (Battery Voltage)

9-14 Volts

⁽¹⁾	Pulse generation should exist during information transmission from Engine Control Module (ECM).

Record any DTCs displayed for system diagnosis. If problem exists and no DTCs are present, trouble shoot engine immobilizer system by symptom. See SYMPTOM INDEX table under SYSTEM TESTS. If any DTCs are present, see ENGINE IMMOBILIZER DIAGNOSTIC TROUBLE CODE DEFINITIONS table for DTC definition and then proceed to appropriate DTC test listed under DIAGNOSTIC TESTS . Once all repairs are performed, clear DTCs from Engine Control Module (ECM). See CLEARING DIAGNOSTIC TROUBLE CODES .

ENGINE IMMOBILIZER DIAGNOSTIC TROUBLE CODE DEFINITIONS

DTC	Description
B2795	Unmatched Ignition Key Code
B2796	No Communication In Engine Immobilizer System
B2797	Communication Malfunction No. 1
B2798	Communication Malfunction No. 2

Fig 1: Identifying Data Link Connector No. 3 Terminals