System Description

DIAGNOSIS SYSTEM

The ECM stores DTCs (Diagnostic Trouble Codes) when trouble occurs on the vehicle.

The diagnosis system allows reading of DTCs stored in the ECM when a hand-held tester is connected to the DLC3 (Data Link Connector 3). If the CRUISE MAIN indicator light does not come on after a DTC check, it means that a malfunction has occurred in the cruise control system.

Use a hand-held tester or SST to check for DTCs.