Data Link Connector: Description and Operation
DESCRIPTIONThe Data Link Connector (DLC), mounted to the left strut tower, is used to access Diagnostic Trouble Codes (DTCs) that may be stored in the ECM memory.
READING TROUBLE CODES
Normal Mode
DTCs stored in the ECM memory can be read by counting the number of flashes of the Malfunction Indicator Lamp (MIL) with the ignition switch in the "ON" position with the diagnostic request terminal "TE1" grounded. The ECM enters its normal diagnostic mode and emits DTCs that have been detected one time within the last two ignition cycles.
Diagnostic Mode
When "TE2" is grounded, the ECM enters its test diagnostic mode and lowers the threshold at which DTCs can be stored in the ECM memory. This function is helpful when diagnosising intermittent problems. With "TE1" and "TE2" grounded, DTCs that cannot be read in the normal diagnostic mode can be read.
ADDITIONAL INFORMATION
For the DLC location and connector pinouts, refer to Locations under this heading.
For information on how to access trouble codes, refer to Computers and Control Systems / System Diagnosis / Vehicle On-Board Diagnostics / Accessing and Reading Diagnostic Trouble Codes.