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.
Test Description
Number(s) below refer the step number(s) on the Diagnostic Chart:
- 1. The Check Engine Lamp (MIL) should be ON steady with the ignition "On", engine "Off. If not, "No Check Engine Lamp (MIL)" chart should be used to isolate the malfunction.
- 2. Checks the Class 2 data circuit and ensures that the ECM is able to transmit serial data.
- 3. This test ensures that the ECM is capable of controlling the Check Engine Lamp (MIL) and the Check Engine Lamp (MIL) driver circuit is not shorted to ground circuit.
- 4. If the engine will not start, "Engine Cranks But Will Not Run" chart should be used to diagnose the fault.
- 6. The Tech 2 parameters which is not within the typical range may help to isolate the area which is causing the problem.
- 12. This vehicle is equipped with ECM which utilizes an electrically erasable programmable read only memory (EEPROM).
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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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