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.
C-Chart Identification/Availability
The following table lists only those C-charts available for this engine, as well as their identifications.
The component system diagnostic charts (C-charts) are used when no trouble codes have been set but one or more of the scan data values are not within typical ranges. Also, many times these charts can be used as component or subsystem functional checks.
These charts are not contained in this article. They can be found in the appropriate article in the ENGINE PERFORMANCE section.
| Chart | Identification/Purpose |
|---|---|
| C-1 | ECM Replacement Check (ECM Quad Driver [QDR] Check) |
| C-1A | Park Neutral Switch Diagnosis (With A/T Only) |
| C-1E | Power Steering Pressure Switch |
| C-2A | Injector Balance Test |
| C-2C | Idle Air Control |
| C-3 | Canister Purge Valve Check |
| C-4A | Ignition System Check |
| C-6 | Electric Divert (M/T Only) |
| C-7 | EGR Check |
| C-8 | Torque Converter Clutch (TCC) Electrical Diagnosis (With A/T Only) |
| C-10A | A/C Clutch Control |
| C-12A | Cooling Fan Control Circuit (With A/C Only) |
NO RELATED
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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.