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.
Introduction To Diagnostic Testing
To select a desired diagnostic feature, diagnostic system must first be programmed to display ".7.0" on FDC. ".7.0" indicates system is ready for a diagnostic feature to be selected. To cause ".7.0" to be displayed on FDC, see ENTERING SELF-DIAGNOSTICS and DISPLAYING TROUBLE CODES under SELF-DIAGNOSTIC SYSTEM. See Fig 1 . With ".7.0" displayed, technician may select any of the following diagnostic tests.
- PCM Switch Tests
- PCM Data Parameters
- PCM Code Snapshot
- PCM Instant Snapshot
- PCM Output Cycling
- PCM Output Overrides
- BCM Data Parameters
- ECC Panel Program Override
Technician may also choose to clear codes or exit diagnostics. See CLEARING TROUBLE CODES and EXITING DIAGNOSTICS under SELF-DIAGNOSTIC SYSTEM.
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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.