Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Scan Tool Displays
When the scan tool displays a Diagnostic Trouble Code (DTC), the status of the DTC is also displayed. The following are Tech 2 scan tool sub-menus in the DTC INFO and SPECIFIC DTC modes. DTC statuses will be indicated only when they apply to the DTC that is set.
- FAIL THIS IGN.
This selection indicates that this DTC failed during the present ignition cycle. - LAST TEST FAIL
This selection indicates that this DTC failed the last time the test ran. If type "A" or "B" DTCs are displayed, the last test may have ran during the previous ignition cycle. For type "C" DTCs, the last failure must have occurred during the current ignition cycle to be displayed as LAST TEST FAIL. - MIL REQUEST
This selection indicates that this DTC is currently requesting MIL illumination. This selection will report type "B" DTCs only after MIL illumination has been requested (failed twice). - TEST FAIL SCC
Test Fail Since Code Clear (SCC) indicates that this DTC is active since the last time DTCs were cleared. - HISTORY
This selection indicates that this DTC is stored in the PCM history memory. Type "B" DTCs will not appear in history until they have been requested by the MIL (failed twice). History will display all type "A" and type "B" DTCs that have the MIL illuminated and have failed within the last 40 warm-up cycles. It will also display type "C" DTCs that have failed within the 40 warm-up cycles. - NOT RUN SCC
Not Run Since Code Clear (SSC) will display DTCs that have not run since DTCs were last cleared. Since any displayed DTCs have not run, their condition (passing or failing) is unknown.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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