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.
Reference Value Parameter Identification (PID)/Measured Signal Chart
The following listing reflects PIDS and/or measured values which may reveal a possible concern within each system shown. Match the category number with the related PID/measured signal and go to the Typical Diagnostic Reference Value Charts.
PID/Measured Signal Chart
| Category Number | Related PIDS/Measured Signals |
|---|---|
| 5, 10, 16 | ACP |
| 1, 18 | APP1 |
| 1, 18 | APP2 |
| 17 | CHT |
| 1, 2, 3, 5, 6, 7, 11, 12, 13, 14, 15, 16, 18 | CKP |
| 1, 2, 3, 5, 6, 7, 11, 12, 13, 14, 15, 16, 18 | CMP |
| 4, 17 | ECT |
| 3, 5, 6, 7, 9, 11, 14, 15, 18 | EGR |
| 5, 17, 18 | EOT |
| 18 | FLI |
| 1, 18 | FP |
| 1, 18 | FPM |
| 1, 18 | FRP |
| 1, 18 | FRT |
| 5 | FTP |
| 17 | HFC |
| 2, 3, 5, 7, 8, 10 | IAT |
| 2, 3, 5, 7, 8, 10 | IAT2 |
| 17 | LFC |
| 1, 18 | MAF |
| 1, 18 | MAP |
| 5 | PTO |
| 1, 18 | RPM |
| 1, 18 | TP |
| 1, 2, 3, 5, 6, 11, 12, 13 | VPWR |
Some signals can only be measured and require the use of a digital multimeter (DMM).
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.