Data Link Connector: Description and Operation

Jumper Installation:

The DLC is located in the engine compartment and is mounted to the left strut tower. The DLC is used to access DTCs that may be stored in the ECM/PCM memory. Diagnostic trouble codes (DTCs) stored in the ECM/PCM 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/PCM enters its normal diagnostic mode and emits DTCs that have been detected one time within the last two ignition cycles. When "TE2" is grounded, the ECM/PCM enters its test diagnostic mode and lowers the threshold at which DTCs can be stored in the ECM/PCM 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.