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.
| Category Number | Related PIDS/Measured Signals |
|---|---|
| 5, 10, 17 | ACP |
| 1, 23 | APP1 |
| 1, 23 | APP2 |
| 23 | BOO1/BOO2 |
| 18, 19 | CHT |
| 1, 2, 3, 5, 6, 7, 11, 12, 13, 14, 15, 16, 17, 20, 21 | CKP |
| 1, 2, 3, 5, 6, 7, 11, 12, 13, 14, 15, 16, 17, 20, 21 | CMP |
| 10 | CPP/PNP |
| 3, 5, 6, 7, 9, 11, 15, 16, 20, 21 | DPFEGR |
| 4, 18, 19, 21, 22 | ECT |
| 3, 5, 6, 7, 9, 11, 15, 16, 20, 21 | EGRMC1 through 4 |
| 3, 5, 6, 7, 9, 11, 15, 16, 20, 21 | EGRMDSD |
| 3, 5, 6, 7, 9, 11, 15, 16, 20, 21 | EGRVR |
| 5, 18, 19, 20, 21 | EOT |
| 3, 5, 6, 11, 21 | EVAPCV |
| 3, 5, 6, 11, 21 | EVMV |
| 20 | FLI |
| 1 through 21 | FP |
| 1 through 21 | FPM |
| 1 through 21 | FRP |
| 1 through 21 | FRT |
| 5 | FTP |
| 1 through 21 | FUELPW1/2 |
| 1 through 21 | FUELSYS (OL/CLSD-LP) |
| 19 | HFC |
| 1 through 21 | HTR11/12/21/22 |
| 2, 3, 5, 7, 8, 10, 22 | IAT |
| 2, 3, 5, 7, 8, 10, 22 | IAT2 |
| 5, 14, 15, 16, 17, 20 | IMTV |
| 4, 5, 16, 18, 19, 20, 21 | KS |
| 19 | LFC |
| 1 through 21 | LONGFT1/2 |
| 1 through 23 | MAF |
| 1 through 23 | MAP |
| 1 through 22 | MISF |
| 1 through 21 | O2S11/12/21/22 |
| 22 | OSS |
| 10 | PSP |
| 5 | PTO |
| 1 through 23 | RPM |
| 5, 14, 16, 17 | SCICP |
| 1 through 21 | SHRTFT1/2/11/12/21/22 |
| 15, 16, 18, 19, 20, 21 | SPARKADV a |
| 1, 23 | TP |
| 2, 4, 5, 9, 10, 11, 16, 17, 18, 19, 20, 21 | VCT |
| 2, 4, 5, 9, 10, 11, 16, 17, 18, 19, 20, 21 | VCTDC/VCTDC2 |
| 1, 2, 3, 5, 6, 11, 12, 13, 14 | VPWR |
| 22, 23 | VSS |
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.