I believe you only have a code reader and it might not be compatible with your vehicle.
SCAN TESTER PROBLEMS
DLC NO. 3 INSPECTION
1. If scan tester displays UNABLE TO CONNECT TO VEHICLE when scan tester is connected, try scan tester on another vehicle. If scan tester operates on another vehicle, go to next step. If scan tester does not operate on another vehicle, problem is probably with scan tester.
2. Check DLC No. 3 for loose or damaged terminals. Ensure DLC No. 3 terminals are in correct position in connector. Repair as necessary. If connector and terminals are okay, go to next step.
3. Check voltage and resistance between ground and specified terminal on DLC No. 3. See DLC NO. 3 VOLTAGE & RESISTANCE SPECIFICATIONS table. See Fig. 2. If voltage and resistance readings are not as specified, check wiring circuit.
NOTE: Terminal No. 2 on DLC No. 3 provides the pulse generation
during the information transmission from the Engine Control Module (ECM).
You can try manual code retrieval by bridging terminal 4 and 13 and turning ignition on to check the blinking code of the MIL.
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Tuesday, June 5th, 2012 AT 2:44 PM